Compress images without uploading them

Shrink photos and screenshots for email, websites and forms. Pick a quality level, or keep them lossless — all on your device, in bulk.

Free forever · Runs on your device · 0 bytes uploaded

Choose images or drop them here · never leaves this device

Max file size (KB)Save asQuality 75%

Slow or not working? Report it on GitHub

How to compress image

Add one or more images.
Choose the output format and quality.
Click “Compress images” and download the result.

Also good for

compress image without losing quality
reduce photo size
compress JPG and PNG in bulk
make images smaller for a website
reduce image size in KB

Private by design — and you can check

Your files are never uploaded, because there is nowhere to upload them to.

No upload step existsFiles are read and written inside this browser tab. There is no server that could receive them.
The browser enforces itThis page’s Content Security Policy only allows connections back to this site, which serves nothing but the app itself.
See for yourselfOpen developer tools, watch the Network tab and run a job: no request carries your document.
Open sourceEvery line is on GitHub, built on Canvas & fflate.

Frequently asked questions

Are my files uploaded anywhere?

No. Fizzdoc does the work inside your browser tab, using open-source engines compiled to WebAssembly and JavaScript. Your file is read from your device, processed locally, and the result is saved straight back to your device. You can check this yourself: open your browser’s developer tools, go to the Network tab, and run a job — no request carries your file.

Can I compress without losing quality?

Yes. Choose PNG for pixel-perfect lossless output. For photos, JPG or WebP at 80% quality usually looks identical and is far smaller.

Is location data removed?

Yes. Re-encoding drops hidden EXIF metadata such as GPS location and camera details.

Is Fizzdoc free?

Yes, and it stays free: no sign-up, no watermark, no daily limit and no premium tier. Fizzdoc is open source under the Apache-2.0 license, so anyone can run their own copy.