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.

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 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.

Also good for

reduce photo size to 20 KB
signature image under 20 KB
compress photo for exam form
resize image to 20 KB for SSC or UPSC form
JPG under 20 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 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, 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.