Most image work — converting a format, resizing, compressing, reading metadata or rasterising an SVG — can run entirely in your browser, so the file never has to be uploaded.
01A safe order of operations
Inspect the file first: read its container, dimensions and metadata before changing anything.
Resize before compressing when you need a smaller file, because fewer pixels always shrink the payload.
Convert the format last, at the quality you actually need, and compare the before/after byte sizes.
02Choosing a format
PNG is lossless and keeps transparency, JPEG is widely compatible, and WebP usually gives the smallest file at a given quality. AVIF can be smaller still, but encoding it depends on the browser.
03SVG is not a raster image
SVG is markup. Optimize it conservatively — comments, editor metadata and whitespace — and export it to PNG only when a raster format is genuinely required.
Frequently asked questions
Are my files uploaded?
No. These tools read and process the file locally in your browser; nothing is sent to a server.
Why did my optimization save so little?
The SVG optimizer is deliberately conservative: it removes only content that cannot change the rendered result, so path data and definitions are left intact.
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