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Compress PDF — free online tool
Shrink a large PDF so it's easy to email, upload, or store, while keeping it perfectly readable. Choose recommended compression for everyday files or extreme for the smallest possible size. It runs entirely in your browser — your files never leave your device, and it's completely free with no signup. Our client-side optimization engine intelligently downsizes embedded images, drops duplicate resources, and deflates structural metadata without degrading document text quality.
- Reduce PDF file size significantly in seconds
- Multiple compression levels: Recommended (balanced quality) and Extreme (maximum size reduction)
- Works locally on your device with no file size or upload limits
- No registration, no emails, and no watermarks added
- Ideal for meeting strict file size requirements on job portals, government sites, or email attachments
How to compress pdf
- 1Upload the heavy PDF file you wish to compress.
- 2Select your compression tier: 'Recommended' (best for most files) or 'Extreme' (best when size is highly critical).
- 3Click the 'Compress PDF' button. The optimization engine runs immediately.
- 4View the resulting compression ratio and download your optimized, smaller PDF.
Frequently asked questions
Will PDF compression reduce document readability?
No. Text character outlines and vector elements remain perfectly sharp and readable. 'Recommended' compression optimizes high-resolution images to standard screen resolutions (150 DPI) and clears layout redundancies, which has no noticeable effect on text. 'Extreme' compression applies stronger image re-encoding (100 DPI) and is best for documents where text clarity is the priority over image resolution.
Is there a limit on file size or usage?
No. Because the compression happens locally on your hardware rather than transferring data to our servers, we impose no arbitrary size limits. You can optimize large documents (even hundreds of megabytes) without hitting server timeout thresholds.
Are my documents secure during compression?
Yes. Merging, splitting, and compressing all execute within your browser tab sandbox. Your files are never uploaded to any server, making this the most secure compression method available online.
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