Compress PDF Online
Compress PDF file size in your browser. Reduce PDF size without losing quality. 100% client-side — your files never leave your device.
PDF compressor online free
Shrink PDF file size for email or faster sharing. If you searched “compress PDF”, “reduce PDF size”, or “PDF compressor online”, use the tool above — processing stays in your browser.
How PDF Compress Works
Paste or enter your input in the field above. Most tools update in real time. Click the Copy button to copy the output. All processing happens in your browser—your data never leaves your device unless the tool explicitly uses a server feature (such as URL shortening or bcrypt hashing).
This tool is part of the PDF Tools category. Check similar tools below. All everytools are free, no signup required. Works on desktop and mobile.
Related topics
Compress PDF before merge or email
Large batches of scans can be heavy. Compressing before you merge or attach to email keeps files under limits. Results vary by content; image-heavy PDFs may compress less than text-only files.
Common Use Cases
- Reduce PDF size for email attachments under size limits
- Compress PDF documents for faster web uploads
- Shrink large PDF reports for mobile viewing
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Frequently Asked Questions
- Is my PDF safe during compression?
- Yes. Compression happens entirely in your browser using pdf-lib. Your file is never uploaded anywhere. Complete privacy guaranteed.
- How much can PDFs be compressed?
- Compression varies depending on the PDF content. Documents with embedded fonts, metadata, and object streams typically see 10-40% reduction. Image-heavy PDFs may see less reduction with this client-side method.