Compress PDF Online
Reduce your PDF file size while maintaining readability. Perfect for email attachments, uploads, and sharing. 100% free, processed in your browser.
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How to Compress PDF Files
Reduce PDF Size Without Losing Readability
Our PDF compressor works by re-rendering each page of your PDF as an optimized image and reassembling them into a new, smaller PDF. This approach is particularly effective for PDFs containing scanned documents, high-resolution photographs, and complex graphics.
The compression happens entirely in your browser using pdf.js for rendering and jsPDF for output — your documents are never uploaded to any server.
When to Compress Your PDF
- Email Attachments: Most email services limit attachments to 25MB. Compress large PDFs to stay under the limit.
- Website Uploads: Smaller PDFs load faster on websites and save bandwidth for your visitors.
- Cloud Storage: Save space on Google Drive, Dropbox, or OneDrive by compressing before uploading.
- Form Submissions: Many online forms have file size limits. Compress to meet requirements.
Frequently Asked Questions
How much can I reduce my PDF size?
Results vary based on content. PDFs with images typically see 40-70% reduction. Text-heavy PDFs with few images may see 10-30% reduction. Use "High" compression for maximum savings.
Will compression make my PDF unreadable?
No. Even at "High" compression, text remains legible. We recommend "Balanced" mode for the best tradeoff between file size and visual quality.
Is this safe for confidential documents?
Yes. Your PDF is processed entirely in your browser. No data is sent to any server. This is the most private PDF compressor available online.
Does it work with scanned PDFs?
Yes! Scanned PDFs (which are essentially images inside a PDF wrapper) benefit the most from compression, often achieving 50-70% size reduction.
Can I compress password-protected PDFs?
Currently, you need to remove the password first. We plan to add password support in a future update.