Client-side tools — nothing you type leaves your browser
Developer Tools
Browse every Gampangin developer tool by category, search by what it does, and open it directly. All tools run in your browser.
Browse by category
Each category has a landing page listing its tools, all running in your browser.
Developer
General-purpose utilities for developers that do not fit a narrower category.
JSON
Format, validate, compare and convert JSON data.
Text
Count, inspect and transform text and string content.
Encoding
Encode and decode data between common textual representations.
Networking
Look up DNS, WHOIS, ASN and other network identity data.
Images
Inspect, convert, resize, compress and optimize images and SVG files locally.
PDF
Split, merge, inspect and edit PDF files locally in the browser.
Dates & Time
Convert, calculate and reason about dates, times and timestamps.
Calculators
Compute everyday numeric values such as percentages and units.
Generators
Generate values such as identifiers and schedules.
Validation
Check input against a documented format or rule.
245 tools
Popular tools
Editorial selection: measured usage is not yet sufficient to rank this honestly (no usage figures are shown).
JSON Formatter
/tools/json-formatter/Format and validate JSON while preserving large integers.
JSON Validator
/tools/json-validator/Check whether a document is valid JSON and report the first syntax error with its position.
Base64 Encoder / Decoder
/tools/base64-encoder/Encode UTF-8 text to Base64 or decode Base64 back to UTF-8 text.
URL Encoder / Decoder
/tools/url-encoder/Percent-encode or decode URL text, for whole URLs or single components.
Trending tools
Editorial selection: measured usage is not yet sufficient to rank this honestly (no usage figures are shown).
JSON Formatter
/tools/json-formatter/Format and validate JSON while preserving large integers.
JSON Validator
/tools/json-validator/Check whether a document is valid JSON and report the first syntax error with its position.
Base64 Encoder / Decoder
/tools/base64-encoder/Encode UTF-8 text to Base64 or decode Base64 back to UTF-8 text.
URL Encoder / Decoder
/tools/url-encoder/Percent-encode or decode URL text, for whole URLs or single components.
Recently added
Editorially ordered by when the tool was added; no publication date or usage figure is shown.
CSS Specificity Calculator
/tools/css-specificity-calculator/Compute the specificity of a CSS selector and compare two selectors.
Asset Reference Checker
/tools/asset-reference-checker/Find relative asset and link references in HTML and CSS and check them against a file list.
.env Validator
/tools/dotenv-validator/Parse and validate dotenv content: syntax, duplicate keys and empty values.
Conventional Commit Generator
/tools/conventional-commit-generator/Build a Conventional Commits message from a type, scope, description and body.
Recently used
Editorial selection: measured usage is not yet sufficient to rank this honestly (no usage figures are shown).
CSS Specificity Calculator
/tools/css-specificity-calculator/Compute the specificity of a CSS selector and compare two selectors.
Asset Reference Checker
/tools/asset-reference-checker/Find relative asset and link references in HTML and CSS and check them against a file list.
.env Validator
/tools/dotenv-validator/Parse and validate dotenv content: syntax, duplicate keys and empty values.
Conventional Commit Generator
/tools/conventional-commit-generator/Build a Conventional Commits message from a type, scope, description and body.
All tools
.cursorrules Generator
/tools/cursorrules-generator/Compose a .cursorrules file from your own project rules — nothing is invented and blank input is refused.
.env Validator
/tools/dotenv-validator/Parse and validate dotenv content: syntax, duplicate keys and empty values.
AES Encryption Tool
/tools/encryption-tool/Encrypt and decrypt text with AES-256-GCM in your browser, with the key derived locally from a passphrase.
AGENTS.md Generator
/tools/agents-md-generator/Compose an AGENTS.md file for coding agents from your own project facts — setup, stack, tests, style and boundaries — with nothing invented.
AI Website Scanner
/tools/ai-website-scanner/Scan a public page for AI-readiness signals — crawl policy, metadata, structured data and readable content — through a stateless SSRF-safe fetch.
API Key Generator
/tools/api-key-generator/Generate prefixed, high-entropy API keys with your browser's cryptographic random source.
APR Calculator
/tools/apr-calculator/Convert a nominal annual rate to a periodic and effective annual rate.
ASCII / Unicode Code Converter
/tools/ascii-encoder/Convert text to space-separated Unicode code points and back.
ASCII85 Encoder / Decoder
/tools/ascii85-encoder/Encode UTF-8 text to Adobe ASCII85 or decode an ASCII85 value back to text.
ASN Lookup
/tools/asn-lookup/Look up the autonomous system for an IP address or ASN.
AWS Cron Validator
/tools/aws-cron-validator/Validate and explain an AWS EventBridge six-field cron expression in your browser.
Acceleration Converter
/tools/acceleration-converter/Convert acceleration between metres per second squared, standard gravity, feet per second squared and galileo.
Age Calculator
/tools/age-calculator/Calculate an exact age in years, months, and days for any reference date.
Anchor Text Generator
/tools/anchor-text-generator/Generate labelled anchor text variants for a target URL.
Angle Converter
/tools/angle-converter/Convert angles between radians, degrees, gradians, turns, arcminutes and arcseconds.
Apache VirtualHost Generator
/tools/apache-vhost-generator/Generate an Apache VirtualHost with a proxy pass and HTTPS redirect in your browser.
App Icon Generator
/tools/app-icon-generator/Generate a web app manifest and maskable icon set.
Area Converter
/tools/area-converter/Convert an area between metric and imperial units with exact factors.
Aspect Ratio Calculator
/tools/aspect-ratio-calculator/Simplify or scale an aspect ratio and resolve the missing dimension of a size.
Asset Reference Checker
/tools/asset-reference-checker/Find relative asset and link references in HTML and CSS and check them against a file list.
Atbash Cipher
/tools/atbash-cipher/Encode and decode the Atbash (mirror-alphabet) cipher.
Average Calculator
/tools/average-calculator/Compute the mean, median, mode and spread of a list of numbers.
BMI Calculator
/tools/bmi-calculator/Compute body mass index and the WHO screening band from weight and height (metric or imperial).
BMR Calculator
/tools/bmr-calculator/Estimate resting energy expenditure with the Mifflin-St Jeor equation.
Base32 Encoder / Decoder
/tools/base32-encoder/Encode UTF-8 text to RFC 4648 Base32 or decode a Base32 value back to text.
Base58 Encoder / Decoder
/tools/base58-encoder/Encode UTF-8 text to Base58 (Bitcoin alphabet) or decode a Base58 value back to text.
Base62 Encoder / Decoder
/tools/base62-encoder/Encode UTF-8 text to Base62 or decode a Base62 value back to text.
Base64 Encoder / Decoder
/tools/base64-encoder/Encode UTF-8 text to Base64 or decode Base64 back to UTF-8 text.
Base64 ↔ PDF
/tools/pdf-base64/Encode a PDF to Base64 or decode Base64 back to a PDF — standard or URL-safe, with an optional data-URL prefix — locally in your browser.
Base64URL Encoder / Decoder
/tools/base64url-encoder/Encode UTF-8 text to URL-safe Base64 or decode a Base64URL value back to text.
Bash Formatter
/tools/bash-formatter/Indent and format Bash shell scripts with consistent layout.
Basic Auth Generator
/tools/basic-auth-generator/Build an RFC 7617 Basic Authorization header value from a username and password without the credential leaving the browser.
Binary Encoder / Decoder
/tools/binary-encoder/Encode UTF-8 text to space-separated 8-bit binary groups or decode binary back to text.
Bitwise Calculator
/tools/bitwise-calculator/Apply bitwise AND, OR, XOR, NOT, NAND and NOR and bit shifts to integers.
Braille Translator
/tools/braille-translator/Translate text to grade-1 Unicode Braille and back.
Break-Even Calculator
/tools/break-even-calculator/Find the break-even units and revenue from fixed costs, unit price and unit variable cost.
Business Day Calculator
/tools/business-day-calculator/Count or add business days across weekends and holidays.
CIDR Calculator
/tools/cidr-calculator/Calculate network, broadcast, mask, wildcard, host range and host counts for a CIDR block.
CLAUDE.md Generator
/tools/claude-md-generator/Compose a CLAUDE.md memory file from your own project facts — overview, commands, stack, standards and boundaries — with nothing invented.
CORS Helper
/tools/cors-helper/Reference the CORS request and response headers and build guidance response headers for an origin, method and credentials mode.
CSS Formatter
/tools/css-formatter/Indent and format CSS rules, selectors and declarations.
CSS Minifier
/tools/css-minifier/Remove CSS comments, redundant whitespace and empty rules.
CSS Specificity Calculator
/tools/css-specificity-calculator/Compute the specificity of a CSS selector and compare two selectors.
CSV Column Stats
/tools/csv-column-stats/Profile every column of CSV, TSV or PSV data — counts, uniqueness, inferred type and numeric min/max/mean — locally in your browser.
CSV Editor
/tools/csv-editor/Edit CSV, TSV or pipe-delimited text and see it parsed into a table with local-only autosave; reuses the shared browser CSV parser.
CSV Merge
/tools/csv-merge/Merge several CSV, TSV or PSV inputs into one table by header union or by position, reporting added and missing columns — locally in your browser.
CSV Profiler
/tools/csv-profiler/Profile a CSV: per-column type, null count, unique count and min/max or length range.
CSV Transpose
/tools/csv-transpose/Transpose CSV, TSV or PSV data — swap rows and columns — while preserving every cell, locally in your browser.
CSV Viewer
/tools/csv-viewer/View CSV, TSV or PSV data as a table — auto-detected delimiter, row and column counts and per-column types — entirely in your browser.
CSV to Markdown
/tools/csv-to-markdown/Convert CSV, TSV or PSV data into a GitHub-flavoured Markdown table or an HTML table, locally in your browser.
CSV to SQL
/tools/csv-to-sql/Generate SQL CREATE TABLE and batched INSERT statements from CSV, TSV or PSV data for standard, PostgreSQL, MySQL or SQLite — locally in your browser.
Caesar Cipher
/tools/caesar-cipher/Encode and decode the Caesar shift cipher over the ASCII alphabet.
Canonical Checker
/tools/canonical-checker/Check a canonical URL for common duplicate-content risks.
Case Converter
/tools/case-converter/Convert text between lower, upper, title, camel, snake, kebab and constant case.
Checksum Generator
/tools/checksum-generator/Compute CRC-32, Adler-32 and FNV-1a checksums in hexadecimal and decimal.
Color Contrast Checker
/tools/color-contrast-checker/Compute the WCAG contrast ratio of two colors and report the AA and AAA pass levels.
Compound Interest Calculator
/tools/compound-interest-calculator/Illustrate compound growth of a lump sum with optional contributions.
Config Converter
/tools/config-converter/Convert between flat .env, properties, INI and JSON config formats in your browser.
Conventional Commit Generator
/tools/conventional-commit-generator/Build a Conventional Commits message from a type, scope, description and body.
Cron Expression Generator
/tools/cron-expression-generator/Validate a five-field cron expression, describe it, and list its next run times.
DNS Lookup
/tools/dns-lookup/Look up A, AAAA, CNAME, MX, TXT and NS records for a hostname.
DNS Propagation Checker
/tools/dns-propagation-checker/Compare a DNS record across resolvers and check propagation.
DNS Record Parser
/tools/dns-record-parser/Parse pasted DNS zone or dig output into structured records.
Data Rate Converter
/tools/data-rate-converter/Convert data transfer rates between bits per second, megabits per second and bytes per second.
Date Calculator
/tools/date-calculator/Compute the number of days between two dates or add a number of days to a date.
Delimited Converter
/tools/delimited-converter/Convert delimited data between CSV, TSV, PSV and custom delimiters with configurable quoting — locally in your browser.
Density Calculator
/tools/density-calculator/Compute density in kg/m³ and g/cm³ from a mass and a volume with unit selection.
Diff Checker
/tools/diff-checker/Compare two texts line by line in your browser, with side-by-side or unified views and no upload.
Discount Calculator
/tools/discount-calculator/Apply one or two stacked discounts and find the savings, final price and effective rate.
Docker Compose Generator
/tools/docker-compose-generator/Generate a docker-compose.yml with app, database and cache services.
Dockerfile Generator
/tools/dockerfile-generator/Generate a multi-stage Dockerfile for your stack.
Duplicate Line Remover
/tools/duplicate-line-remover/Remove duplicate lines while keeping the first or last occurrence.
Duration Calculator
/tools/duration-calculator/Compute a calendar duration between instants or apply one to a date.
Electric Charge Converter
/tools/charge-converter/Convert electric charge between coulombs, millicoulombs, microcoulombs and ampere-hours.
Energy Converter
/tools/energy-converter/Convert energy between joule, calorie, watt-hour, BTU and electronvolt units.
Entropy Calculator
/tools/entropy-calculator/Measure the Shannon entropy and brute-force search space of a password or token in your browser.
Env File Generator
/tools/env-file-generator/Generate a placeholder-only .env, shell, Compose or Kubernetes environment file in your browser.
Favicon Generator
/tools/favicon-generator/Generate a browser-ready SVG favicon and link tags.
Flow Rate Converter
/tools/flow-rate-converter/Convert volumetric flow between cubic metres per second, litres per minute, CFM and US gallons per minute.
Force Converter
/tools/force-converter/Convert force between newtons, kilonewtons, pound-force, kilogram-force, dyne and ounce-force.
Fraction Calculator
/tools/fraction-calculator/Add, subtract, multiply and divide fractions with exact integer reduction.
Frequency Converter
/tools/frequency-converter/Convert frequency between hertz, kilohertz, megahertz, gigahertz and revolutions per minute.
Git Command Lookup
/tools/git-command-lookup/Look up real Git commands by task with syntax and examples.
Git Conflict Analyzer
/tools/git-conflict-analyzer/List the conflicted blocks in a file with conflict markers and their ours/theirs sides.
GitHub Actions Generator
/tools/github-actions-generator/Generate a GitHub Actions workflow with triggers, setup and steps.
GitLab CI Generator
/tools/gitlab-ci-generator/Generate a .gitlab-ci.yml with stages and jobs.
Gitattributes Generator
/tools/gitattributes-generator/Generate a .gitattributes with line-ending, binary and diff rules.
Gitignore Generator
/tools/gitignore-generator/Generate a .gitignore from selected ecosystems in your browser.
HMAC Generator
/tools/hmac-generator/Compute a keyed HMAC-SHA-1/256/384/512 message authentication code without your key leaving the browser.
HTML Editor
/tools/html-editor/Write HTML with a sanitized live preview and local-only autosave; scripts, event handlers and external resources are removed.
HTML Entity Encoder
/tools/html-entity-encoder/Encode text to named and numeric HTML entities and decode them back.
HTML Formatter
/tools/html-formatter/Indent and format HTML markup with consistent line breaks.
HTML Minifier
/tools/html-minifier/Remove HTML comments and redundant whitespace safely.
HTML/CSS Playground
/tools/html-css-playground/Compose HTML and CSS and see a sanitized preview; pasted JavaScript is shown for reference but never executed. Local-only autosave.
HTTP Header Parser
/tools/http-header-parser/Parse a raw HTTP header block into named fields, values, duplicate groups and malformed-line warnings.
HTTP Request Builder
/tools/http-request-builder/Compose a well-formed HTTP/1.1 request message from a method, target, headers and body without sending it.
HTTP Status Lookup
/tools/http-status-lookup/Look up RFC 9110 HTTP status codes by number or phrase with class, description and reference.
Hash Generator
/tools/hash-generator/Compute SHA-1, SHA-256, SHA-384, SHA-512 and MD5 message digests in your browser.
Helm Values Helper
/tools/helm-values-helper/Generate a Helm Chart.yaml and values.yaml scaffold in your browser.
Hex Encoder / Decoder
/tools/hex-encoder/Encode UTF-8 text to hexadecimal byte pairs or decode hex back to text.
IDN Converter
/tools/idn-converter/Convert internationalized domain names between Unicode and ASCII (punycode) forms.
IP Calculator
/tools/ip-calculator/Inspect an IPv4 address: class, scope, integer, hex, binary, octal and reverse-DNS name.
IPv4/IPv6 Converter
/tools/ipv4-ipv6-converter/Convert IPv4 to IPv4-mapped, IPv4-compatible and 6to4 IPv6, and normalise IPv6 notation.
IPv6 Expander
/tools/ipv6-expander/Expand a compressed IPv6 address to its full 8-group form and report its canonical form.
ISO 8601 Parser
/tools/iso-8601-parser/Parse ISO 8601 dates, times, durations and intervals into their parts.
Illuminance Converter
/tools/illuminance-converter/Convert illuminance between lux, foot-candle, phot and nox.
Image Compressor
/tools/image-compressor/Re-encode an image at a chosen quality to reduce its byte size, and compare before and after.
Image Converter
/tools/image-converter/Convert an image between PNG, JPEG, WebP and AVIF locally in your browser.
Image Metadata Viewer
/tools/image-metadata/Read PNG, JPEG, WebP and GIF metadata — dimensions, EXIF, IPTC, XMP and PNG chunks — locally.
Image Resizer
/tools/image-resizer/Resize an image to exact dimensions or a percentage, optionally locking the aspect ratio.
JSON Beautifier
/tools/json-beautifier/Pretty-print JSON with 2-space, 4-space or tab indentation.
JSON CSV Converter
/tools/json-csv-converter/Convert JSON to CSV and CSV back to JSON in the browser.
JSON Compare
/tools/json-compare/Compare two JSON documents semantically in your browser: key-order and whitespace-insensitive, type-aware, with exact number literals and RFC 6901 paths.
JSON Formatter
/tools/json-formatter/Format and validate JSON while preserving large integers.
JSON Merge Patch
/tools/json-merge-patch/Generate an RFC 7396 JSON Merge Patch from a source and a target JSON value.
JSON Minifier
/tools/json-minifier/Remove all insignificant whitespace from JSON while preserving every value.
JSON Patch Generator
/tools/json-patch-generator/Generate an RFC 6902 JSON Patch document from a source and a target JSON value.
JSON Pointer
/tools/json-pointer-resolver/Resolve an RFC 6901 JSON Pointer against a JSON document.
JSON Schema Prompt Helper
/tools/json-schema-prompt-helper/Turn a JSON Schema into a natural-language output instruction that names every field, locally in your browser.
JSON Schema Validator
/tools/json-schema-validator/Validate JSON against a JSON Schema subset and list every violation.
JSON Sort Keys
/tools/json-sort-keys/Sort every object key recursively for stable, deterministic JSON.
JSON Validator
/tools/json-validator/Check whether a document is valid JSON and report the first syntax error with its position.
JSON XML Converter
/tools/json-xml-converter/Convert JSON to XML and XML back to JSON in the browser.
JSON YAML Converter
/tools/json-yaml-converter/Convert JSON to YAML and YAML back to JSON in the browser.
JSON-LD Helper
/tools/json-ld-helper/Format, validate and inspect JSON-LD structured data.
JSONPath Query
/tools/jsonpath/Query JSON with JSONPath and see every match with its JSON Pointer path.
JWT Encoder & Verifier
/tools/jwt-tool/Encode and verify HMAC-signed JWTs (HS256, HS384, HS512) in your browser and check their time claims.
JavaScript Formatter
/tools/js-formatter/Indent and format JavaScript while preserving line-break semantics.
JavaScript Minifier
/tools/js-minifier/Remove JavaScript comments and redundant whitespace while preserving ASI semantics.
Jenkinsfile Generator
/tools/jenkinsfile-generator/Generate a declarative Jenkinsfile pipeline.
Kubernetes YAML Generator
/tools/kubernetes-yaml-generator/Generate a Kubernetes Deployment and Service manifest in your browser.
LLM API Request Generator
/tools/llm-request-generator/Generate a provider request (endpoint, placeholder key, JSON body and code) with the full disclosure of provider, model, cost, transmission, retention and key handling. Nothing is sent.
Leetspeak Translator
/tools/leetspeak/Convert text to leetspeak (1337) and back with a best-effort decoder.
Line Counter
/tools/line-counter/Count lines, blank lines, words and characters in text.
List Randomizer
/tools/list-randomizer/Shuffle, sample or pick from a list with a reproducible seed option.
Loan Calculator
/tools/loan-calculator/Estimate a fixed-rate loan's monthly payment, total paid and total interest.
Lorem Ipsum Generator
/tools/lorem-ipsum/Generate deterministic placeholder lorem ipsum text.
Luminance Converter
/tools/luminance-converter/Convert luminance between candela per square metre, nits, foot-lamberts, lamberts and stilbs.
MCP Config Generator
/tools/mcp-config-generator/Generate a Model Context Protocol client config block and server command snippet from your own values — the tool produces text only and starts no server.
Markdown Editor
/tools/markdown-editor/Write Markdown with a sanitized live HTML preview and local-only autosave; nothing is uploaded and no code runs.
Markdown Formatter
/tools/markdown-formatter/Normalise Markdown headings, lists, blank lines and fences.
Markdown Minifier
/tools/markdown-minifier/Minify Markdown by trimming whitespace and collapsing blank lines.
Model Pricing Calculator
/tools/model-pricing-calculator/Estimate model cost from input/output token counts and a cited, timestamped price catalog, or your own prices, locally.
Molarity Calculator
/tools/molarity-calculator/Compute moles and molarity from a mass, a molar mass and a solution volume.
Morse Code Translator
/tools/morse-code/Encode text as International Morse code and decode it back.
NATO Phonetic Alphabet
/tools/nato-alphabet/Spell text with the NATO/ICAO phonetic alphabet and decode it back.
Newline Normalizer
/tools/newline-normalizer/Detect and convert line endings between LF, CRLF and CR.
Nginx Config Generator
/tools/nginx-config-generator/Generate an nginx server block with TLS and a proxy pass in your browser.
Number Base Converter
/tools/number-base-converter/Convert an integer between any two bases from 2 to 36 with arbitrary-precision arithmetic.
Number Formatter
/tools/number-formatter/Format a number with grouping, fixed or significant precision and scientific notation.
Octal Encoder / Decoder
/tools/octal-encoder/Encode UTF-8 text to space-separated octal byte groups or decode octal back to text.
Ohm's Law Calculator
/tools/ohms-law-calculator/Solve Ohm's law for voltage, current, resistance or power from the other two values.
Online Notepad
/tools/notepad/A plain-text scratchpad with live character, word and line counts and local-only autosave; nothing is uploaded.
Open Graph Generator
/tools/open-graph-generator/Generate Open Graph meta tags for a page.
OpenAPI Converter
/tools/openapi-converter/Convert OpenAPI JSON to YAML and back, or generate a minimal OpenAPI 3.1 skeleton, in the browser.
OpenAPI Viewer
/tools/openapi-viewer/Parse an OpenAPI 3.x or Swagger 2.0 document in JSON or YAML and render its structure in the browser.
OpenSSL Command Generator
/tools/openssl-command-generator/Build copy-pasteable OpenSSL commands for keys, certificates and encryption without running them.
OpenTelemetry Config Generator
/tools/opentelemetry-config-generator/Generate an OpenTelemetry Collector configuration in your browser.
PDF Merger
/tools/pdf-merge/Combine two or more PDFs into one document in a chosen order, locally in your browser, with a combined page count.
PDF Metadata Viewer
/tools/pdf-metadata/Read PDF metadata locally — version, page count and sizes, Info and XMP fields, and encryption/linearization flags — without editing or uploading the file.
PDF Page Extractor
/tools/pdf-page-extract/Extract selected pages from a PDF into a new document in the order you choose, locally in your browser.
PDF Page Remover
/tools/pdf-page-delete/Delete selected pages from a PDF and keep the rest in order, locally in your browser, refusing to produce an empty document.
PDF Page Rotator
/tools/pdf-page-rotate/Rotate selected PDF pages by 90, 180 or 270 degrees, leaving the other pages unchanged, locally in your browser.
PDF Splitter
/tools/pdf-split/Split a PDF into every page, fixed-size parts or explicit page ranges, locally in your browser, and download each result.
PEM & Certificate Helper
/tools/pem-certificate-helper/Inspect PEM blocks, convert PEM to and from base64 DER, and compute certificate fingerprints locally.
Pace Calculator
/tools/pace-calculator/Find running pace, speed and finish time from a distance and a time.
Password Generator
/tools/password-generator/Generate cryptographically secure random passwords with a chosen length and character classes.
Password Hash Tool
/tools/password-hash-tool/Derive and verify PBKDF2 password hashes in your browser, and inspect bcrypt and Argon2 hash formats with their limits stated.
Percentage Calculator
/tools/percentage-calculator/Calculate a percentage of a number, what percent one number is of another, or percent change.
Power Converter
/tools/power-converter/Convert power between watt, kilowatt, megawatt, horsepower and BTU per hour.
Pressure Converter
/tools/pressure-converter/Convert pressure between pascal, bar, psi, atmosphere, torr and millimetre of mercury.
Profit Margin Calculator
/tools/profit-margin-calculator/Work out profit, profit margin and markup from a cost and a selling price.
Prompt Diff
/tools/prompt-diff/Compare two prompt versions line by line and see added, removed and changed lines plus the token and character delta — locally.
Prompt Formatter
/tools/prompt-formatter/Normalize a prompt — line endings, trailing spaces, blank-line runs, bullet markers and wrapping — deterministically in your browser.
Python Formatter
/tools/python-formatter/Normalise Python indentation to a consistent width without changing blocks.
Query String Parser
/tools/query-string-parser/Parse a URL query string into decoded key/value pairs and a JSON object.
Rail Fence Cipher
/tools/rail-fence-cipher/Encode and decode the rail-fence zig-zag transposition cipher.
Random Number Generator
/tools/random-number-generator/Generate cryptographically secure random integers or decimals within a range.
Random Token Generator
/tools/random-token-generator/Generate cryptographically secure random tokens in hex, base64url, base32 and base58 encodings.
Ratio Calculator
/tools/ratio-calculator/Simplify, scale, solve or split a ratio with exact integer reduction.
Regex Generator
/tools/regex-generator/Build a safe regular expression from curated patterns.
Regex Tester
/tools/regex-tester/Test a regular expression against a subject and inspect matches and capture groups.
Relative Time
/tools/relative-time/Describe the distance between two instants in words and parts.
Reverse DNS Lookup
/tools/reverse-dns-lookup/Build the IPv4 and IPv6 reverse DNS (PTR) names for an IP address.
Robots AI Crawler Helper
/tools/robots-ai-crawler-helper/Build a robots.txt policy for named AI crawlers, or analyze an existing robots.txt to see which AI crawlers it allows or blocks.
Roman Numeral Converter
/tools/roman-numeral-converter/Convert between Roman numerals and decimal numbers for values 1 to 3999.
SERP Preview
/tools/serp-preview/Preview a Google desktop and mobile search result for a page.
SQL Formatter
/tools/sql-formatter/Lay out SQL clauses on their own lines with optional keyword upper-casing.
SQL Minifier
/tools/sql-minifier/Minify SQL by stripping comments and collapsing insignificant whitespace while keeping every string literal and quoted identifier byte-for-byte, locally in your browser.
SQL Parameter Formatter
/tools/sql-parameter-formatter/Rewrite SQL placeholders between styles such as ? , $1, :name, @name, %s or {0}, numbering positional parameters in order and listing the bindings, locally in your browser.
SQL Query Analyzer
/tools/sql-query-analyzer/Analyse SQL structure: each statement's type, the referenced tables, joins, whether it filters with WHERE and how many parameters it binds, locally in your browser.
SQL Safety Checker
/tools/sql-safety-checker/Scan SQL for destructive statements such as DROP, TRUNCATE, DELETE or UPDATE without a WHERE clause, ALTER ... DROP and privilege changes, and see each one explained, without ever running it.
SQL Statement Splitter
/tools/sql-statement-splitter/Split a SQL script into numbered statements on top-level semicolons, keeping strings, quoted identifiers and comments intact, locally in your browser.
SQL Validator
/tools/sql-validator/Check a SQL statement for structural problems such as unbalanced parentheses, unterminated strings or comments, and an unrecognised leading command, for PostgreSQL, MySQL, SQLite or T-SQL, locally in your browser.
SVG Optimizer
/tools/svg-optimizer/Safely shrink an SVG by removing comments, editor metadata and inter-tag whitespace.
SVG Viewer
/tools/svg-viewer/Preview an SVG safely and inspect its structure — viewBox, dimensions, shapes and colours.
SVG to PNG
/tools/svg-to-png/Rasterise an SVG to a PNG at a chosen scale, locally in your browser.
Sitemap Generator
/tools/sitemap-generator/Generate a valid XML sitemap from a list of URLs.
Sitemap Validator
/tools/sitemap-validator/Validate an XML sitemap against the sitemaps.org protocol.
Slug Generator
/tools/slug-generator/Convert text to a URL-safe slug with a chosen separator.
Social Preview
/tools/social-preview/Preview how a link renders across social platforms.
Speed Converter
/tools/speed-converter/Convert a speed between metric and imperial units with exact factors.
Structured Data Generator
/tools/structured-data-generator/Generate valid JSON-LD structured data for a page.
Structured Output Helper
/tools/structured-output-helper/Build a strict structured-output contract from a sample JSON value, or repair fenced/trailing-comma JSON into valid JSON — locally.
Subnet Calculator
/tools/subnet-calculator/Compute subnet details for an IPv4 address and a subnet mask or prefix, including the host range.
System Prompt Builder
/tools/system-prompt-builder/Compose a structured system prompt from role, objective, capabilities, constraints, tone and output format — locally in your browser.
TOML Validator
/tools/toml-validator/Validate TOML syntax: structure, comments, key/value errors and duplicate keys.
Terraform Config Generator
/tools/terraform-config-generator/Generate Terraform provider, resource, variable and output blocks in your browser.
Text Counter
/tools/text-counter/Count characters, words, lines, sentences, and paragraphs, and estimate reading time.
Text Deduplicator
/tools/text-deduplicator/Remove duplicate lines, words or comma-separated items.
Text Reflow
/tools/text-reflow/Reflow wrapped hard-wrapped prose to a target column width without breaking words.
Text Sorter
/tools/text-sorter/Sort lines alphabetically or numerically in either direction.
Timestamp Converter
/tools/timestamp-converter/Convert between Unix timestamps in seconds or milliseconds and ISO-8601 instants.
Timezone Converter
/tools/timezone-converter/Convert an instant between IANA timezones with offset, DST and day-shift.
Tip Calculator
/tools/tip-calculator/Calculate a tip, the total bill and the split per person.
Title & Meta Checker
/tools/title-meta-checker/Audit a page title and meta description for length and quality.
Token Counter
/tools/token-counter/Count characters, words, lines and UTF-8 bytes and estimate LLM tokens locally, with the method and its limits stated.
Torque Converter
/tools/torque-converter/Convert torque between newton-metres, pound-force feet, pound-force inches and kilogram-force metres.
Twitter/X Card Generator
/tools/twitter-card-generator/Generate Twitter/X card meta tags for a page.
TypeScript Formatter
/tools/typescript-formatter/Indent and format TypeScript and JavaScript with preserved line breaks.
URL Builder
/tools/url-builder/Compose a URL from scheme, host, port, path, query parameters and fragment with correct percent-encoding.
URL Encoder / Decoder
/tools/url-encoder/Percent-encode or decode URL text, for whole URLs or single components.
URL Parser
/tools/url-parser/Parse an absolute URL into scheme, host, port, path, query parameters and fragment, with optional percent-decoding.
URL Query Remover
/tools/url-query-remover/Remove tracking and other query parameters from a URL and report what changed.
UTM Campaign URL Builder
/tools/utm-builder/Build a UTM-tagged campaign URL with validated parameters.
UUID Generator
/tools/uuid-generator/Generate RFC 9562 version 4 (random) or version 7 (time-ordered) UUIDs.
Unicode Escape
/tools/unicode-escape/Escape text to Unicode code-point escape sequences and decode them back.
Unit Converter
/tools/unit-converter/Convert a value between length, mass, temperature, data-size, and time units.
Unix Permissions Calculator
/tools/unix-permissions-calculator/Convert between symbolic and octal Unix file modes and read the permission bits.
User-Agent Parser
/tools/user-agent-parser/Classify a User-Agent string into browser, engine, operating system, device class and bot flag.
VAT Calculator
/tools/vat-calculator/Add VAT to a net amount or remove it from a gross amount at one rate.
VLSM Calculator
/tools/vlsm-calculator/Allocate a base network across required host counts with variable-length subnet masking.
Vigenere Cipher
/tools/vigenere-cipher/Encode and decode the Vigenere polyalphabetic cipher with a keyword.
Volume Converter
/tools/volume-converter/Convert a volume between metric and US/imperial units with exact factors.
WHOIS Lookup
/tools/whois-lookup/Look up domain registration and WHOIS data.
Whitespace Cleaner
/tools/whitespace-cleaner/Trim, collapse and remove whitespace from text.
Wildcard Mask Calculator
/tools/wildcard-mask-calculator/Convert between subnet masks, prefix lengths and wildcard masks for ACLs and routing filters.
World Clock
/tools/world-clock/Show the current time in any set of IANA timezones.
XML Formatter
/tools/xml-formatter/Indent and format well-formed XML documents.
XML Minifier
/tools/xml-minifier/Minify XML by removing comments and inter-element whitespace.
YAML Formatter
/tools/yaml-formatter/Normalise YAML indentation and trailing whitespace.
YAML Minifier
/tools/yaml-minifier/Minify YAML by removing comments and blank lines and compressing indentation.
ads.txt Generator
/tools/ads-txt-generator/Generate an IAB ads.txt seller line with validation.
cURL Generator
/tools/curl-generator/Compose a copy-pasteable, shell-escaped curl command from a method, URL, headers and body.
robots.txt Generator
/tools/robots-txt-generator/Generate a robots.txt from user-agent rules and sitemaps.
AI tools directory
A curated directory of AI tools with real pricing tiers, categories and official vendor links, reviewed by the Gampangin organization.
How your input stays local
These are the guarantees the test suite enforces — not measured results. There is no server roundtrip, no upload, and no account.
- Runs locally in your browserMost tool code runs in this page; the few server-backed lookups are labelled Server-side on their page.
- No upload requiredBrowser tools never upload input; server-backed lookups send only the validated target and do not store it.
- Search stays in your browserThe catalog is embedded in the page; a query issues no network request.