Compress PDF
Reduce the size of image-heavy PDFs by re-encoding pages at a quality you choose. Great for email attachments and uploads.
Drag & drop or click to choose
Choose a PDF to compress
Files are processed on your device and never uploaded.
How to compress pdf
- 1Upload the PDF you want to compress.
- 2Pick a quality level (higher compression = smaller file).
- 3Download the compressed PDF.
Reduce PDF file size for email and uploads
Many websites and email providers reject files that are too large, and scanned documents can easily run into tens of megabytes. Compress PDF re-encodes the images inside your document at a quality level you control, dramatically cutting the file size while keeping it readable.
You choose the balance: a lighter setting keeps images crisp with modest savings, while stronger compression produces the smallest possible file for quick sharing.
When compression helps most
Compression works best on image-heavy or scanned PDFs, where photos and page scans take up most of the space. Text-only PDFs are already compact, so the savings there are smaller — that is normal, not a fault.
Everything runs in your browser, so even large confidential files are compressed without ever being uploaded. After compressing you can Merge PDF or add a Watermark before sharing.
Frequently asked questions
Why did my text-only PDF barely shrink?+
Compression works best on scanned or image-heavy PDFs. Text-based PDFs are already compact, so savings are small.
Will compression blur my document?+
At high compression, image quality drops to save space. Use a higher-quality setting if sharpness matters.
Is my file uploaded to compress it?+
No. Compression runs entirely in your browser — your PDF never leaves your device.