Compress PDF
Reduce file size while keeping quality
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Large PDF files can be difficult to share via email, upload to portals, or store efficiently. OpenPDF's compression tool reduces the size of your PDF documents while maintaining visual quality and text readability.
The compression works by rebuilding the PDF structure and removing redundant data, unused objects, and unnecessary metadata that accumulates as documents are edited and saved over time. This is especially effective on PDFs that were created by merging multiple files, exported from design tools, or scanned from physical documents.
After compression, you see a clear comparison of the original and compressed file sizes along with the percentage reduction. This lets you verify the savings before downloading. If the file is already well-optimized, the tool lets you know so you do not waste time trying alternative approaches.
All compression happens in your browser. Your PDF is processed locally using JavaScript — nothing is uploaded to any server. This means your confidential documents stay completely private, and the tool works even on slow or offline connections once the page has loaded.
OpenPDF compression is free with no file size limits, no daily usage restrictions, and no watermarks added to the output. The compressed PDF retains all pages, text, images, and formatting from the original document.
Frequently asked questions
How much can I expect the file size to shrink?
It depends on the source PDF. Files with redundant objects or created by merging tools often shrink 10-40%. Already-optimized files may see little reduction.
Does compression reduce image quality?
The current compression method focuses on removing structural redundancy rather than resampling images. Image quality remains the same as the original.
Is the text still searchable after compression?
Yes. Text content, fonts, and searchability are fully preserved. The compression only removes unused internal objects and metadata.
Can I compress password-protected PDFs?
The tool attempts to load encrypted PDFs. Some password-protected files may not be supported depending on the encryption method used.
Is there a file size limit?
There is no server-side limit. Very large files process locally, so speed depends on your device. Most PDFs under 50 MB compress in seconds.