Compress PDF online — reduce PDF file size for free
Shrink file size with lossless cleanup or image downsampling.
Drop your file here
or click to browse — one file at a time
How to compress PDF in your browser
Need to compress a PDF online because it is too large to email or upload? This free PDF compressor rebuilds object streams, strips unused data and downsamples heavy images so you can reduce PDF file size while keeping text sharp and readable.
- 1Upload the PDF you want to compress.
- 2Choose lossless cleanup or an image compression level.
- 3Run the compressor and compare the before and after file size.
- 4Download the smaller PDF.
What this compress PDF online tool does
Lossless PDF cleanup
Recompresses streams and removes unreferenced objects. Best when you want to make a PDF smaller without touching image quality at all.
Image downsampling levels
Scanned documents and photo-heavy brochures shrink the most. Pick a quality level to balance file size against visual fidelity.
Real before and after sizes
Every run reports the original size, the compressed size and the percentage saved, so you know exactly how much smaller the PDF became.
Why people use it
- Free with no account, no email and no watermark
- Runs in the browser — documents stay on your device
- Works on Windows, macOS, Linux, Android and iOS
- Also great for reduce PDF file size and compress PDF free
Frequently asked questions
How much can I reduce a PDF file size?
- Text-only files typically shrink 5-25% with lossless cleanup, while scanned or image-heavy PDFs often drop 50-80% with image downsampling.
Is compressing a PDF online safe?
- Compression happens locally in your browser, so the document is not sent to a server for processing.
Related PDF tools
Continue your workflow with another free PDF tool from PaperWorksPDF.