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
Fizzdoc vs TinyPNG
- How Fizzdoc handles your fileIt never leaves your device: every tool runs inside your browser tab, and the page is blocked from sending files anywhere. Free, with no account, no daily limit and no watermark.
- How TinyPNG handles itTinyPNG compresses images on its servers, so each image is uploaded first.
- When TinyPNG is the better choiceTinyPNG offers a developer API and plugins (such as for WordPress) that compress images automatically.
Based on TinyPNG’s public website, October 2026. Plans and limits change, so check their site for the latest. TinyPNG is a trademark of its owner; Fizzdoc is independent and not affiliated.
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 here only to compare.
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