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PDF compression tool

A web-based tool that reduces PDF file size to ease sharing and submission, suitable for students, professionals, and teams handling large documents.

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460+
Total Calculations Run
< 15ms
Browser Execution Speed
100%
Client-Side Privacy
4.9 / 5.0
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About This Tool

The tool accepts a PDF file and applies domain-aware optimization to produce a smaller, readable document. It supports lossy downsampling of images, font subsetting when allowed, metadata removal, and object consolidation. The result enables easier sharing and submission without major content loss.
In lossy mode, images are downsampled and re-encoded at lower quality; in lossless mode, streams are re-encoded while preserving visual fidelity. It can strip metadata and unused resources to reclaim space, and it provides final size, reduction percentage, and processing time as a report.
Ideal users include students, professionals, and teams needing to comply with upload limits or bandwidth constraints. Its value comes from combining multiple optimization steps into one workflow and offering target-size guidance with transparent reporting.
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How to Use

  1. Upload the PDF file to be compressed.
  2. Choose compression mode: lossy for smaller files or lossless for fidelity.
  3. Optionally set target_size_kb or image_quality to steer results.
  4. Run the compression and monitor progress.
  5. Download the output PDF and review the size and report.
How to use pdf compression tool

Frequently Asked Questions

Find Quick Answers

What is the difference between lossy and lossless mode?
Lossy mode reduces file size by lowering image quality and removing nonessential data, potentially affecting visuals. Lossless mode preserves visual fidelity by re-encoding streams without data loss, though the reduction may be smaller.
Can I compress password-protected PDFs?
Password-protected PDFs require the correct password to access content before compression. If the password is not provided or the encryption blocks processing, the tool returns a clear, structured error rather than attempting to bypass security.
Will fonts be embedded or subsetted?
Font handling is configurable. By default, the tool subsets embedded fonts to reduce size when possible, instead of embedding full font sets. This preserves appearance with smaller file sizes but may affect non-subsettable fonts.
How accurate is the size reduction?
Size reduction depends on content complexity. Text-heavy PDFs compress differently from image-rich documents. The tool provides an estimated final size and a tolerance range; actual results may vary by content and original encoding.

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