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All compression happens locally in your browser. No files uploaded to servers.

Works Offline
No Tracking
No Server Upload

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Compress PDF Online

Reduce the file size of your PDF documents. Choose your desired compression level. Note: This tool primarily optimizes PDF structure; for files large due to unoptimized images, further significant reduction may require image pre-processing.

Or drag and drop your PDF file here.

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No Upload Required
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Compress PDF Online: Fast In‑Browser Size Reduction

Core Idea: This tool reduces PDF file size fully client‑side—no uploads—by restructuring objects and optionally downscaling/ recompressing embedded images.
How It Works: Your file is parsed with PDF-Lib; images (if library available) are re‑encoded based on the slider level; fonts optionally subset; the optimized PDF is reassembled and offered for download.
Sanity Checks: After compression open the file: confirm page order, text clarity (no fuzziness), form fields (if any) intact, and compare original vs new size (KB/MB).
Shortcuts: Text‑only docs: 30–40% slider. Mixed content: 45–60%. Image-heavy scans: 65–80%. Need email under 1MB? Adjust until target reached; re-run if needed.
Pitfalls: Extremely large scanned PDFs (hundreds of pages) may hit memory limits. Aggressive compression can blur small text in scans. Already‑optimized PDFs may shrink little.
Micro-examples: 9.2MB scan → 58% → 2.7MB (−70%). 1.4MB text report → 35% → 0.9MB. 600KB optimized invoice → 50% → 570KB (minimal change).
Mini-FAQ:
  • Uploads? None—local only.
  • Quality loss? Only for image recompression at higher levels.
  • Passwords? Encrypted PDFs not supported yet.
  • Batch? Use your OS file system—one at a time here.
Action Tip: Keep the original; use filenames like report_compressed.pdf to track versions. Try moderate compression first, then increase only if still too large.
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