Every image compressor I tried did one of three things: upload my files to a server I do not control, stop me after 20 images unless I paid, or quietly watermark the output. For a task this simple, that felt wrong.
So I built the tool I wanted and put it on my site: Free Image Compressor & Converter
What it does
- Batch processing: drop in as many JPG, PNG or WebP files as you like
- Compress with a quality slider, with before and after sizes for every file
- Convert between JPG, PNG and WebP
- Resize by max width or by percentage
- Download files one by one, or everything together as a ZIP
- No sign-up, no file limit, no watermark
How it works
Everything runs in the browser with the Canvas API. Your images are decoded locally, re-encoded at the settings you chose, and packed into a ZIP with JSZip if you want them together. Nothing is sent to a server, which also means the tool costs me nothing to run and works the same for the first visitor and the ten-thousandth.
Two honest side effects of this approach:
- Re-encoding through a canvas strips EXIF data, including GPS coordinates. For photos you share online, that is usually a privacy win.
- Compression here means re-encoding at a lower quality setting. There is no server-side magic, and PNG stays lossless, which leads to the next point.
The PNG lesson
My first tester converted a 340 KB photo to PNG and got a 2 MB file back. The tool was not broken; PNG is lossless and simply the wrong choice for photographs. But a good tool should stop you from walking into that. The compressor now leaves PNG out of the compress flow entirely, and warns you in the convert flow when a PNG output will make your photos bigger. Small UX decisions like that matter more than another feature.
Try it
The tool is live at https://logicstack.org/tools/image-compressor
If you try it, I would genuinely like to know what felt missing or confusing. I build in public and feedback shapes the next iteration.
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