A private, free alternative to TinyPNG
Make photos and screenshots smaller without sending them anywhere. Compress in bulk, pick the quality, or hit an exact size such as 50 KB for a form, all on your device.
Free forever · Runs on your device · 0 bytes uploaded
How Fizzdoc works
- Your file stays on your deviceEvery tool runs inside your browser tab, and the page is blocked from sending files anywhere. You can check it in your browser’s Network tab.
- Free, with nothing attachedNo account, no daily limit, no watermark and no paid plan. Open source under Apache-2.0.
- Works anywhereAny modern browser on Windows, Mac, Linux, Android or iPhone, with nothing to install, in 16 languages.
TinyPNG is a trademark of its owner and is named only to say what this page is about. Fizzdoc is an independent project, not affiliated with or endorsed by TinyPNG.
Fizzdoc tools for the jobs people use TinyPNG for
Each one works in your browser, free, without uploading anything.
- 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.
- PNG to PDFTurn PNG screenshots and images into one PDF.
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
How can Fizzdoc work without uploading my file?
Every tool runs inside your browser tab, using engines compiled to WebAssembly. Your file is read from your device, processed there and saved back to it. The page is only allowed to talk to fizzdoc.com, which serves nothing but the website itself, and you can watch your browser’s Network tab to see that no file leaves.
Can I compress many images at once?
Yes. Add as many as you like; they are compressed one after another on your device and saved in a ZIP.
Is Fizzdoc made by TinyPNG?
No. Fizzdoc is an independent, open-source project and is not affiliated with or endorsed by TinyPNG. TinyPNG is a trademark of its owner and is named only to say what this page is about.
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