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Compress PDF

Compress PDF online to reduce PDF file size for email attachments, uploads, forms, and storage by re-encoding the document structure directly in your browser.

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Upload a PDF to compress.

Usage notes

  • This browser-side PDF compressor removes unused objects and applies object streams. Heavy image compression requires server-side processing.
  • Results depend on how the original PDF was created. Some files already use optimal encoding.
  • Use this workflow first when you need to compress PDF for email without uploading the file anywhere.

Related pages

Merge PDFSplit PDFGuide: Compress PDF For EmailAll PDF Tools

How to Use This Tool

  1. 1Upload a PDF file using the file input.
  2. 2Click Compress and Download to start processing.
  3. 3The tool re-encodes the document structure using object streams to reduce file size.
  4. 4Compare the original and compressed sizes shown on screen.
  5. 5Download the compressed PDF if you're satisfied with the result.

Frequently Asked Questions

How do I compress a PDF online for free?
Upload your file, click Compress and Download, and the tool reduces PDF file size in your browser. This is a free online PDF compressor with no signup.
How much will my PDF be compressed?
Compression results vary depending on how the original PDF was created. Documents with redundant objects or unoptimized encoding may shrink significantly, while already-optimized files may see minimal reduction.
Does compression reduce image quality?
This browser-based tool re-encodes the document structure without resampling images. Image quality remains unchanged. For stronger compression that reduces image resolution, a server-side tool would be needed.
Is my file uploaded to a server?
No. Compression happens entirely in your browser using JavaScript. Your file stays on your device.
Why didn't my file get smaller?
Some PDFs are already well-optimized. If the original file uses minimal objects and efficient encoding, there may be little room for further compression.
Can I compress password-protected PDFs?
No. The PDF must be unlocked before compression. We plan to add a PDF unlock tool in a future update.