Free Tool
Compress PDF
Reduce PDF file size by up to 80%. 100% private — files never leave your device.
100% browser-based — your files never leave your device
Compressed PDF will appear here
Up to 80% Smaller
Dramatically reduce file size while preserving readability.
100% Browser-Based
Files never leave your device. Safer than cloud-based tools.
3 Compression Levels
Choose lossless, balanced, or maximum compression.
No Ads, No Watermark
No ads, no stamp, no signup. Just compress and download.
How It Works
Upload PDF
Drop a file or click to browse. Your file stays in your browser.
Choose compression
Pick low, medium, or maximum compression.
Download
Get your compressed PDF instantly. See how much smaller it got.
Use Cases
Email attachments
Shrink PDFs to fit email size limits.
Upload to portals
Government and university portals often have strict size limits.
Faster sharing
Smaller files upload and download faster on slow connections.
Save storage
Compress documents for archiving to free up disk space.
Who It's For
Office Workers
Compress PDFs to fit email attachment limits (25MB).
Students
Shrink assignments to meet upload portal size requirements.
Government & Legal
Meet strict file size requirements for court or regulatory submissions.
Archivists
Compress hundreds of documents to save storage space.
RunCLI vs Smallpdf
| Feature | RunCLI | Smallpdf |
|---|---|---|
| Files stay on your device | Yes (browser-based) | No (uploaded to server) |
| Free daily limit | Unlimited | 2 tasks/day |
| Ads | Never | No |
| Signup required | No | For pro |
| Price | Free forever | Free limited, $9/mo pro |
| Max file size | 100 MB | 5 MB (free) |
Nothing Uploaded
Compression happens in your browser. Zero server contact.
No Ads, No Watermark
Unlike iLovePDF and TinyWow, we never show ads.
Open Technology
Built with pdf-lib — transparent, auditable code.
Why RunCLI?
100% Private
Files processed in your browser. Nothing uploaded.
No Limits
No daily caps, no file count limit, no signup required.
No Ads
No ads, no popups, no dark patterns.
Instant
No upload wait time. Compression happens locally.
Need more than PDF tools?
RunCLI offers AI-powered tools for transcription, translation, OCR, and more.
Frequently Asked Questions
Is it really free?
Yes, completely free with no limits and no ads. Use it as much as you want.
Are my files safe?
Your files never leave your browser. All compression happens locally.
How much can it reduce?
Results vary. Text-heavy PDFs: 10-30%. PDFs with unoptimized images: 50-80%.
Does compression reduce quality?
Low compression preserves quality. Medium and high strip metadata and optimize structure.
Does it work on mobile?
Yes. Works in any modern browser on any device.
Can I compress to 100KB?
Use maximum compression. Results depend on your PDF content — image-heavy PDFs can often be reduced to 100KB or less. Text-only PDFs are already small.
Is it safe for sensitive documents?
Yes. Your files never leave your browser. All compression happens locally on your device — nothing is uploaded to any server.
Are there ads?
No. RunCLI never shows ads. Free tools are truly free.