Perfect For
Email Attachments
- Get under 25MB limit
- Faster sending
- Keeps readability
Document Storage
- Save disk space
- Archive old files
- Batch compress
Web Uploads
- Meet size limits
- Faster uploads
- No quality issues
Compress PDF Online Free & Private
Reduce PDF file size by up to 80%. No uploads, no servers — everything runs in your browser.
Your documents never leave your device
Drop PDF files here or click to browse
PDF files — up to 100MB each
80%
Max Reduction
100%
Private
Batch
Multi-File
Shrink Any PDF in Three Steps
Drop Your PDF
Drag in one file or a whole batch. Invoices, reports, scanned docs — anything goes.
Choose Your Balance
Need a tiny file for email? Slide quality down. Need it crisp for printing? Keep it high.
Download & Send
Your compressed PDF is ready instantly. Download it, attach it, share it — done.
Why Not Just Use Smallpdf or Adobe?
Smallpdf, ILovePDF, and Adobe all upload your documents to their cloud. Your contracts, tax returns, and private files pass through third-party servers. For sensitive documents, that's a dealbreaker.
Truly Confidential
Your PDFs never leave your computer. Not even for a millisecond. Zero server contact.
No Paywalls
No "2 free compressions per day" tricks. No watermarks. No forced account creation. Just compress.
Works Anywhere
Once this page loads, it works even offline. Compress on a plane, in a cafe, or behind a corporate firewall.
Compression Quality Guide
| Setting | Quality | Best For | Typical Savings |
|---|---|---|---|
| Low resolution + 50% quality | Readable | Archiving, quick review | 60-80% |
| Medium + 75% quality | Good | Email, sharing | 40-60% |
| High + 90% quality | Excellent | Printing, presentation | 20-40% |
Frequently Asked Questions
Are my PDFs uploaded to a server?
No. Everything runs in your browser using JavaScript. Your documents are never sent anywhere — they stay on your device the entire time.
Will the compressed PDF look the same?
At recommended settings (Medium resolution, 75% quality), the difference is barely noticeable for most documents. For photo-heavy PDFs or scanned documents, the savings are especially large.
Can I compress password-protected PDFs?
No. Password-protected PDFs cannot be processed in the browser. You'll need to remove the password first, then compress.
Will text remain selectable after compression?
This tool rasterizes PDF pages (converts them to images) for maximum compression. Text won't be selectable in the output. This makes it ideal for scanned documents, presentations, and photo-heavy PDFs where text selection isn't critical.
What's the maximum file size?
There's no hard limit, but very large PDFs (100MB+) may be slow depending on your device. For best results, we recommend files under 100MB. For larger files, try the MediaOptim desktop app.
How does this compare to Adobe Acrobat or Smallpdf?
Unlike Adobe Acrobat (paid subscription) or Smallpdf (uploads to servers), this tool is completely free and processes everything locally. Your documents never leave your device, making it ideal for sensitive files.
Need More Power?
Compress videos, photos & audio. HEVC, WebP, AVIF, FLAC support.
$49 one-time
Get MediaOptim for MacFree Up Phone Storage
Compress photos & videos directly on iOS and Android.
$4.99 one-time
Get MediaOptim Mobile