Compress PDF
Reduce PDF file size while preserving quality.
Drop your PDF here
or click to browse
Up to 10 MB · 20 pages
Savings depend on what is inside the file. Text-heavy documents shrink the most; PDFs that are mostly scanned images will change very little.
How to compress pdf
Compression reduces a PDF’s file size so it fits an email attachment limit or an upload form. It works by rewriting the document’s internal structure and recompressing its streams.
- 1
Choose your PDF
Drop the PDF you want to shrink.
- 2
Pick a compression level
Low preserves the most quality, high reduces size the most. Medium suits most documents.
- 3
Download
Click Compress. The tool reports the before and after sizes alongside the download.
Your files never leave your device
Unlike most online PDF tools, this one uploads nothing. Everything runs inside your browser, so your document is never transmitted, never stored on a server, and never seen by anyone but you. Once the page has loaded you can disconnect from the internet entirely and the tool still works.
Frequently asked questions
- Are my files uploaded anywhere?
- No. Every operation runs inside your browser. The file is read into memory on your own device, processed there, and offered back to you as a download. It is never sent to a server, never stored, and never seen by anyone else. You can disconnect from the internet after the page loads and the tool still works.
- How much smaller will my file get?
- It depends entirely on the source. Text-heavy PDFs and those saved by inefficient tools often shrink substantially; a PDF that is mostly already-compressed photographs may barely change.
- Will compression blur my images?
- Structural compression is lossless. Higher levels apply stronger stream compression, but the tool does not downsample images to unreadable quality.
- Why did my file not get smaller?
- Some PDFs are already optimally compressed. If the output would be no smaller, there is little left to remove — this is normal for exports from modern software.
Related tools
DinoPDF — every tool runs in your browser. Nothing is uploaded.