PDF Compressor

Reduce PDF file size right in your browser. Pick a compression level, compare the real before/after size, and download.

Drop a PDF here or click to upload

PDF only

Max file size 60MB. Your PDF never leaves this browser.

Low compression keeps your PDF fully intact — text stays selectable and searchable. Savings are typically modest.
0%
Size reduction

How to Compress a PDF

  1. Click the upload area, or drag and drop a PDF onto it.
  2. Choose Low, Medium or High compression.
  3. Click "Compress PDF" and check the real before/after file size.
  4. Click "Download compressed PDF" to save the result.

Benefits

  • Shrink PDFs for easier emailing and faster uploads.
  • See the actual, measured size reduction — never a fabricated number.
  • No installation and no account required.
  • Runs entirely in your browser — your file is never uploaded to a server.

Features

  • Three compression levels with a clear explanation of the tradeoffs.
  • Honest results — if a level can't shrink the file further, we say so instead of faking a reduction.
  • Page count and original file size shown up front.
  • Friendly error messages for corrupt or password-protected PDFs.

Privacy & Security

This tool compresses your PDF using the open-source pdf-lib and PDF.js libraries, running entirely on your device. Your file is never uploaded to a Napizo server. Read the full Privacy Policy for details.

Frequently Asked Questions

At Low compression, no — your PDF stays fully intact with selectable text. At Medium and High, each page becomes an optimized image, so file size drops significantly but text is no longer selectable and image quality is reduced.

Some PDFs are already well optimized. If a level doesn't reduce the size, we'll tell you honestly instead of showing a fake result — try a higher compression level.

This tool can't open password-protected PDFs. Remove the password first, then upload the file.

Yes, uploads are limited to 60MB.

Related Tools

PDF Merger · Image Compressor · All PDF Tools