Compress PDF Online
Reduce PDF file size while maintaining the best possible quality. 3 compression levels available.
Select PDF file to compress
Drop your PDF here to reduce file size instantly in your browser
How to use Compress PDF in 3 easy steps
No software installation required. 100% free and runs smoothly on mobile, tablet, or desktop.
1. Select Your PDF
Upload the document you want to shrink in size.
2. Choose Compression Level
Select Extreme, Recommended, or Low compression based on your quality needs.
3. Download Compressed File
Save your optimized PDF with up to 80% reduced file size.
Guaranteed Document Confidentiality
Your files stay on your machine. Client-side tools do not send your files to our servers.
Frequently Asked Questions
Everything you need to know about Compress PDF on HoudiniPDF.
How does in-browser compression work?
The engine strips unneeded duplicate metadata, structural fonts, and repacks raw streams with Deflate/Flate object stream compression without sending files to the cloud.
Will my text become blurry after compression?
No. Text is vector-based and remains razor-sharp regardless of the compression level chosen.
Which level should I choose for email attachments?
Recommended or Extreme compression is best for getting PDFs below email provider thresholds (e.g. 25MB).
Is there a limit on how many times I can compress?
No. HoudiniPDF is 100% free with unlimited compressions and no queue wait times.
Can I compress password-protected files?
Please unlock the document first using our "Unlock PDF" tool before compressing.
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