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?
Compare PDF
Get any file to the size you need. Privately.
1 Open this page and add the file. Compare PDF 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
Compare PDF reads the text layer of two files and shows a word-level difference. It does not overlay pages visually, and it does not notice a moved logo if the words stayed the same. Both files stay on this device, which matters for contract drafts. Scans without text compare as empty. Read the pages yourself before you sign.
Compare PDF 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: both drafts stay in memory here, so a contract is not uploaded to a diff service.
- 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 “Compare PDF” upload my file?
Compare PDF reads the file in this tab. There is no upload step and no account.
What will “Compare PDF” actually change?
You get a word difference of the text layers. Visual changes without text changes can be missed.
When is “Compare PDF” the wrong job?
Do not compare scans here and conclude the pictures match. Empty text is not proof.
How do I check the result of “Compare PDF”?
Read the inserted and deleted words, then open both PDFs on the page that changed.
Can I run “Compare PDF” with Wi-Fi off?
Load this page, then turn Wi-Fi off and run Compare PDF again. A finished result is the proof that the file was not sent anywhere.
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Last updated 2026-09-27.