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Image Compressor
Make image files smaller without sending them anywhere. Drop in one file or fifty, choose a quality level, and download the results — the whole thing runs on your own machine.
How to use it
- Drag your images onto the drop area, or click it to pick files. Multiple files at once are fine.
- Move the quality slider. 70–80% is usually invisible on photos; drop lower for smaller files.
- Press Compress, then download each result individually or press Download all.
Why it stays private
Re-encoding happens through the canvas element that is already built into your browser. Your bytes are read from disk, decoded, re-encoded and handed back to you — they are never placed on a network request. You can confirm this yourself in the Network panel of your browser's developer tools.
Questions
How much smaller will my files get?
It depends entirely on the image. Photographs saved as JPEG typically drop 40–80% at 70% quality with no visible difference. PNGs of screenshots and diagrams often shrink a lot when converted to WebP. An image that is already well optimised will barely change.
Does compressing change the image dimensions?
No. This tool only re-encodes — every pixel stays where it was. If you need different dimensions, use the image resizer instead.
Is there a limit on file size or how many files?
There is no limit imposed by us, because nothing is sent to us. The practical ceiling is your own machine's memory, which in practice means files of a few hundred megabytes are fine.