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.
Popular tools
Popular tools
All tools
Optimize
Organize
Convert to PDF
Convert from PDF
Edit
Security
Smart
Workflows
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 PNG
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
PNG gets smaller in a browser mainly by resizing, because it has no JPEG-style quality slider. Flat colors, screenshots, and logos are what PNG is for. Photographs usually belong in JPEG or WebP if you need them small. Transparency can stay in PNG; a JPEG would put a solid background behind a logo, so do not switch formats by accident.
Compress PNG 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 PNG” upload my file?
Compress PNG reads the file in this tab. There is no upload step and no account.
What will “Compress PNG” actually change?
Compress PNG writes a new file. JPEG and WebP can lose detail on purpose. PNG gets smaller by having fewer pixels.
When is “Compress PNG” the wrong job?
Skip Compress PNG 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 PNG”?
Open the Compress PNG download beside the original. Ringing edges mean you should use a larger target.
Can I run “Compress PNG” with Wi-Fi off?
Load this page, then turn Wi-Fi off and run Compress PNG again. A finished result is the proof that the file was not sent anywhere.
Compress imageJPG to PDFCompress PDFPNG to JPGJPG to WebPWebP to JPG
Compress imageResize image to 100 KBReduce photo size
Best image format for the webHow to shrink photos for applicationsCompress images for email
Last updated 2026-09-27.