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?
Compress JPG to 20 KB
Get any file to the size you need. Privately.
1 Drop the picture. The format and size goal on this page are already chosen.2 The browser encodes a new file. The original on disk is not overwritten.3 Read the status line for the size you got, then look at the subject before you send it.
About this tool
This page keeps the output as JPEG and aims at 20 KB, which forces a small pixel size. Use it for a thumbnail you will never zoom. A JPEG of a page of text will not stay sharp. If you needed PNG, use the PNG page instead.
Compress JPG to 20 KB 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 pixels never go to an image host.
- 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 “Compress JPG to 20 KB” upload my file?
Compress JPG to 20 KB reads the file in this tab. There is no upload step and no account.
What will “Compress JPG to 20 KB” actually change?
Compress JPG to 20 KB writes a new file. JPEG and WebP can lose detail on purpose. PNG gets smaller by having fewer pixels.
When is “Compress JPG to 20 KB” the wrong job?
Skip Compress JPG to 20 KB when you still need the camera original for print or for an edit you have not done.
How do I check the result of “Compress JPG to 20 KB”?
Open the Compress JPG to 20 KB download beside the original. Ringing edges mean you should use a larger target.
Can I run “Compress JPG to 20 KB” with Wi-Fi off?
Load this page, then turn Wi-Fi off and run Compress JPG to 20 KB again. A finished result is the proof that the file was not sent anywhere.
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Last updated 2026-09-27.