BosConvertPro LogoBosConvertPro

Drop your PDF here

or click to browse

Supports PDF files up to 100MB

Lightning Fast

Compress PDFs in seconds with our optimized in-browser compression engine.

Quality Preserved

Smart algorithms maintain text readability and image clarity at every compression level.

100% Private

Everything runs in your browser. Your files never leave your device or touch our servers.

Completely Free

No subscription, no account, no hidden fees. Compress unlimited PDFs at zero cost.

No Installation

Works directly in any modern browser on desktop or mobile — nothing to download.

About PDF Compressor

Our free online PDF compressor uses advanced browser-based algorithms to reduce file size while maintaining document quality. Whether you need to shrink a PDF for an email attachment, a file upload limit, or to save storage space, our tool gives you full control over the compression level — from subtle optimization to aggressive size reduction.

Why Use Our PDF Compressor?

  • Choose from four compression levels to balance size and quality
  • All processing runs locally in your browser — no uploads, no privacy risk
  • Works on any device without installing software or plugins
  • Compress PDFs of any size, up to 100MB, for free
  • See the exact size reduction before downloading your file
FAQ

Frequently Asked Questions

How does the PDF compressor work?
Our tool renders each page of your PDF as an image in your browser and re-encodes it at your chosen quality level. All processing happens locally — no files are uploaded to any server.
Will my PDF lose quality after compression?
Depending on the compression level, images may lose some sharpness. Low and Medium compression maintain excellent readability. High and Maximum compression trade quality for smaller file sizes.
Is there a file size limit?
You can compress PDFs up to 100MB. Processing very large files may take a moment depending on your device's performance.
Are my files private?
Yes, completely. All compression runs entirely in your browser. Your files are never uploaded to our servers or shared with anyone.
What compression levels are available?
Four levels are available: Low (best quality, minimal size reduction), Medium (balanced), High (strong compression, good quality), and Maximum (smallest file size, reduced quality).
Can I compress password-protected PDFs?
Password-protected PDFs cannot be processed. Please remove the password protection from your file before compressing.
What happens to my file after compression?
Nothing — your files are processed entirely in your browser and never leave your device. Once you close or reload the tab, no trace of your file remains.
Can I adjust the compression level after compression?
Yes. Simply move the compression slider to a new level and the tool will automatically re-compress your PDF with the updated settings.
Does it work on mobile devices?
Yes, the PDF compressor works on any modern browser including mobile browsers on iOS and Android. Performance depends on your device's processing power.
How much can I reduce my PDF file size?
Results vary by content. Image-heavy PDFs can be reduced by 40–80%. Text-heavy documents may see 10–30% reduction. Maximum compression achieves the smallest possible file size.