Compress PDF
Reduce PDF file size without losing quality.
Shrink a PDF file to make it easier to email, upload or store. Use lossless rebuild to strip redundant data, or strong compression that re-encodes images — all done locally in your browser.
How to use
Select a PDF
Choose the PDF to compress or drag it into the panel.
Pick a mode
Lossless rebuild keeps text crisp. Strong mode re-encodes images for the smallest file.
Compress
Click COMPRESS. Watch the progress bar — large files take a few seconds to re-encode.
Download
Compare the new size shown in the result panel, then click DOWNLOAD.
Features
Privacy & security
Compression happens locally on your device. The original file and the compressed result never leave your browser.
Limitations
- Lossless mode only helps documents with redundant data; already-optimized PDFs may not shrink much.
- Strong mode converts pages to compressed images, so text becomes non-selectable in the output.
- Compression is CPU- and memory-intensive for large files; very big documents may take a while.
Frequently asked questions
Image-heavy PDFs often shrink by 50-80% in strong mode. Text-only PDFs may only lose a few percent in lossless mode.
In lossless mode, yes. In strong mode pages become images, so text is no longer selectable.
Yes. Compression runs locally in your browser, so sensitive files never touch a server.
There is no hard limit, but browsers handle files up to roughly 200 MB comfortably.