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Shrink PDF File Size While Keeping Clarity

Reduce your PDF footprint for easy sharing and storage using high-performance local compression.

Drag & Drop PDF file here

Smart, Secure Compression

Large PDF files can be a hassle to email or upload. Our compression tool uses advanced algorithms to significantly reduce file sizes while preserving the visual integrity of your images and text. Unlike other services that process your files on the cloud, OncePDF compresses your documents locally in your browser. This approach not only ensures that your data is never exposed to third-party servers but also makes the process incredibly fast, as there are no upload or download delays. Optimize your documents for web use, email attachments, or archiving with a tool that values both your efficiency and your security.
Small Footprint Keep Clarity Local Only

Why Shrink PDF File Size While Keeping Clarity with OncePDF?

Large PDF files can be a hassle to email or upload. Our compression tool uses advanced algorithms to significantly reduce file sizes while preserving the visual integrity of your images and text. Unlike other services that process your files on the cloud, OncePDF compresses your documents locally in your browser. This approach not only ensures that your data is never exposed to third-party servers but also makes the process incredibly fast, as there are no upload or download delays. Optimize your documents for web use, email attachments, or archiving with a tool that values both your efficiency and your security.

How to shrink your PDF

  1. Select your file: Drag your PDF over or click to find it on your computer.
  2. Pick a level: We've got three options: Extreme (tiny file), Recommended (best balance), or Less (highest quality).
  3. Compress it: Just click the button and we'll start the magic right there in your browser tab.
  4. Download: Your smaller file will be ready to grab in no time.

We don't want your data.

Honestly, your documents are none of our business. By doing everything locally in your browser, OncePDF ensures that your sensitive stuff never even leaves your sight. It's a "Zero-Knowledge" system, which is just a fancy way of saying we can't see what you're working on.

No cloud storage, no data breaches, and no worrying about who else might be looking at your files. It's just you and your browser.

Why you'll actually use this

Email Friendly

Finally stop seeing those "File Too Large" errors when you're trying to hit a deadline.

Save Space

Clean up your hard drive by shrinking those massive scans into something more reasonable.

Speed up your site

If you're hosting PDF's, smaller files mean your users can open them much faster.

Frequently Asked Questions

Common questions about compress pdf and how it works.

Will my PDF lose quality after compression?

Our tool offers different levels of compression. 'Recommended' compression maintains a great balance between quality and file size.

Is there a file size limit?

We support files up to 50MB for free compression.

Still have questions? Our support team is here to help you.

Contact Support