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?
Open source PDF tools
Get any file to the size you need. Privately.
1 Open this page and add the file. Open source PDF tools starts in the browser you already have open.2 Run the tool. If this version cannot do the job honestly, it says so instead of inventing a result.3 Download the file that was built on this device. Closing the tab drops the bytes.
About this tool
Open-source PDF tools with public code. Verify the on-device architecture yourself on GitHub. No analytics, no third-party trackers, and no hidden server uploads.
Open source PDF tools 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.
- No upload: the privacy claim is that no upload request exists for the file.
- Speed: the file does not travel to a server and back, so the wait is only the work itself.
- Quality: the original is kept when the new file would be worse or is not actually smaller.
FAQ
Does “Open source PDF tools” upload my file?
Open source PDF tools reads the file in this tab. There is no upload step and no account.
What will “Open source PDF tools” actually change?
Open source PDF tools runs only the named tool. A privacy page does not add a hidden converter.
When is “Open source PDF tools” the wrong job?
Leave any site that copies the promise of Open source PDF tools and then shows a bar labeled uploading.
How do I check the result of “Open source PDF tools”?
After Open source PDF tools is ready, the network panel should not gain a new origin. Then open the download and read it.
Can I run “Open source PDF tools” with Wi-Fi off?
Load this page, then turn Wi-Fi off and run Open source PDF tools again. A finished result is the proof that the file was not sent anywhere.
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Last updated 2026-09-27.