Compress an image to under 20 KB
Forms often want a photo or signature under 20 KB. Fizzdoc keeps the picture as large and sharp as it can, lowers the JPG quality only as far as needed, and never uploads your photo.
Runs on your device · 0 bytes uploaded
Drag files to reorder, or use the arrows.
How to compress Image to 20 KB
- Add one or more images (JPG, PNG, WebP or a phone photo).
- Check the limit (20 KB is filled in; change it if your form asks for a different size).
- Click “Compress images” and download the result.
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 qpdf, pdf.js & pdf-lib.
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.
How does it keep the photo clear?
Like messaging apps, it first keeps the photo about 1600 pixels on its longest side and lowers the JPG quality step by step, never below 50% while the photo is 1000 pixels or larger. Only if that is still too big does it make the picture smaller.
What if my form needs an exact pixel size too?
Use Resize Image first to set the width and height the form asks for, then compress the result here.
Is Fizzdoc free?
Yes. There is no sign-up, no watermark and no daily limit. Fizzdoc is open source under the Apache-2.0 license.
More private tools
- Compress ImageMake JPG, PNG and WebP images smaller.
- Compress Image to 50 KBGet a photo or signature under 50 KB for an online form.
- Compress Image to 100 KBGet a photo or signature under 100 KB for an online form.
- Resize ImageMake images larger or smaller, by pixels or percent.
- Convert ImageConvert between JPG, PNG and WebP.
- Image to Text (OCR)Select and copy text from any photo or screenshot.
- PNG to JPGConvert PNG images to JPG in bulk.
- JPG to PNGConvert JPG images to PNG in bulk.