PDF Compressor
Reduce PDF file size instantly in your browser. No uploads, no server — 100% private.
Drop your PDF here
or click to browse
PDF onlyHow to Compress a PDF
Upload Your PDF
Click the upload area or drag and drop your PDF file. Only PDF files are accepted.
Select Compression Level
Choose Low for best quality with moderate size reduction, Medium for a balance, or High for maximum compression.
Click Compress PDF
Hit the Compress PDF button and wait while the tool processes your file page by page.
Download Your Compressed PDF
View the size savings and download your compressed PDF with a single click.
Frequently Asked Questions
The actual compression ratio depends on the PDF's content. PDFs that contain lots of redundant metadata, unoptimized streams, or embedded resources can see significant reductions. Highly optimized or image-heavy PDFs may see smaller gains.
This tool compresses by rebuilding the PDF structure, removing unused metadata, and enabling object stream compression. Text and vector content is preserved without quality loss. Some embedded image data may be re-encoded depending on the level selected.
There is no enforced file size limit. However, since all processing runs in your browser, very large PDFs (100 MB+) may take longer and consume significant memory. We recommend compressing files under 200 MB for the best experience.
No. Your file never leaves your device. All compression is performed entirely in your browser using the PDF-lib JavaScript library. Nothing is transmitted to any server.
The tool will attempt to load password-protected PDFs using the ignoreEncryption option. If the PDF has an owner password but no user password, it may still be processed. PDFs with a required user password will need to be unlocked first.