Free · Open source · No upload
Get any file to the exact size you need.
Compress, convert and sign PDFs and photos in your browser. Your files are never uploaded.
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How it works
Choose a file
Select or drop a PDF or photo into the workspace.
Set your target
Pick an exact size limit or strength goal.
Download
Get your file instantly without leaving your browser.
Questions
Are my files sent to any server?
Is Weesize really completely free?
How does exact-size compression work?
Does it work offline?
About Weesize
Get any file to the size you need. Privately.
1 Load the application in any modern desktop or mobile browser.2 Select any PDF or image tool to process your files locally.3 Test offline functionality by turning off Wi-Fi after page load.
About this tool
Weesize is a free, open-source, browser-only PDF and image toolkit. We built it because uploading sensitive contracts, tax forms, or personal identity scans to third-party web servers is an unnecessary privacy risk. All processing (compression, merging, splitting, converting, and watermarking) is performed directly inside your browser using modern WebAssembly and JavaScript engines. No files are ever uploaded to any server. Once the web application loads, you can turn off Wi-Fi or disconnect from the internet completely and continue using all features offline. The codebase is transparent and open source.
About Weesize stays on this device. The download is the copy you keep, and Weesize does not store a second one. Close the tab when you are finished and the bytes are gone.
- 100% on-device processing via browser WebAssembly and Web APIs.
- Open source repository transparently documented and verifiable.
- Zero server uploads, zero sign-ups, zero tracking scripts, and zero ads.
FAQ
Does “About Weesize” upload my file?
About Weesize reads the file in this tab. There is no upload step and no account.
What will “About Weesize” actually change?
Weesize processes every file in client-side memory without external API calls.
When is “About Weesize” the wrong job?
You can inspect network traffic in Developer Tools to confirm zero upload requests occur.
How do I check the result of “About Weesize”?
The product is free forever for personal, student, and commercial use.
Can I run “About Weesize” with Wi-Fi off?
Load this page, then turn Wi-Fi off and run About Weesize again. A finished result is the proof that the file was not sent anywhere.
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Last updated 2026-09-27.