PDF Compressor

Drop PDF files here or click to choose files

Supports PDFs up to 100.0 MB, compressed locally with visual layout first

All PDFs are processed locally in your browser and are not uploaded.

0 files
0 completed
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Add PDFs to see compression results, savings, and download options.

About PDF Compressor

Product introduction

PDF Compressor is a browser-local tool that first uses QPDF/WASM to optimize PDF structure and streams, then tries a visual re-encoding candidate and automatically keeps the smaller result. Recommended mode prioritizes the page's visual layout; if visual re-encoding wins, text selection may be affected. Optional metadata cleanup can remove author and producer details, and files never leave your device.

Features

  • Recommended mode compares structural optimization with visual re-encoding and keeps the smaller PDF automatically
  • Run QPDF/WASM optimization locally in the browser, so files are not uploaded
  • Optionally clean metadata to reduce unnecessary author and producer information
  • Show original size, compressed size, page count, and saved ratio for each file
  • Safely optimize scanned and image-heavy PDFs, while noting that savings may be limited

How to use

  1. 1Drop one or more PDFs, or click the upload area to choose files
  2. 2Turn metadata cleanup on or off depending on your document needs
  3. 3Wait while the browser validates files, reads page counts, and optimizes locally
  4. 4Review each file's saved ratio and processing status
  5. 5Download one compressed PDF or package all results into a ZIP

Frequently asked questions

Are my PDFs uploaded to a server?
No. Validation, page counting, and QPDF/WASM compression all run locally in your browser, so files never leave your device.
Will compression reduce text quality?
The tool prioritizes the visual layout. To reach higher compression, recommended mode may re-encode page visuals; visual clarity is preserved as much as possible, but text selection or copying may be affected.
Why do scanned PDFs sometimes shrink only a little?
A scanned PDF is often already made of compressed images. If those images are already optimized, there may be little safe space to save without image resampling.
What does metadata cleanup remove?
It attempts to remove non-page details such as author, creator application, producer, and modification data without deleting page text, images, or annotations.
Which PDFs may fail?
Password-protected, encrypted, damaged, or browser-unreadable PDFs may fail. Remove protection or re-export the document before trying again.

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