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Compress PDF

Reduce PDF file size while maintaining the best possible quality.

Drag & drop your PDF here

or click to browse files

Max file size: 100MB

100% Private

Files never leave your device

Real Compression

Re-encodes images at target quality

No Watermarks

Clean output, no branding added

All Browsers

Works on desktop and mobile

Compression Settings

Level

Compression works by re-rendering pages as JPEG images at reduced quality.

Your file is processed locally and never stored.

About PDF Compressor

Our free PDF compressor reduces the file size of your PDF documents without requiring any software installation. Whether you need to email a large PDF, upload it to a website with file size limits, or simply save storage space, our tool handles it all instantly in your browser. We support three compression levels — Medium, Strong, and Extreme — so you can choose the right balance between file size and quality.

Who Uses This Tool

  • Students submitting assignments with file size limits
  • Professionals emailing large reports and presentations
  • Freelancers uploading portfolios to job platforms
  • Businesses archiving documents to save storage space
  • Publishers preparing print-ready PDFs for distribution
  • Anyone sharing PDFs on WhatsApp or messaging apps

Key Features

  • Three compression levels: Medium, Strong, and Extreme
  • Supports PDF files up to 100MB
  • No software installation required — works in any browser
  • Files processed securely and deleted within 15 minutes
  • Shows exact file size reduction after compression
  • Works on Windows, Mac, iPhone, and Android

Tips for Best Results

  1. 1Use Medium compression for documents with important images — it preserves quality better
  2. 2Use Extreme compression for text-heavy PDFs where image quality is less important
  3. 3If your PDF is already compressed, the file size may not reduce further
  4. 4Compress before merging multiple PDFs to keep the final file size manageable
  5. 5For scanned PDFs, Extreme compression gives the biggest size reduction

PDF24X's PDF compressor is completely free to use with no registration required. Your privacy is protected — files are processed securely and never shared with third parties. Compress as many PDFs as you need, whenever you need.

How It Works

  1. 1

    Upload your PDF

    Drag and drop or click to browse. Files up to 100MB supported.

  2. 2

    Choose compression level

    Select Extreme, Strong, or Medium based on your needs.

  3. 3

    Download

    Click Compress and download your smaller PDF instantly.

Frequently Asked Questions

Does compression reduce quality?

Medium compression has minimal impact. Strong may slightly reduce image sharpness. Extreme produces the smallest file with more noticeable reduction.

Is my file uploaded to a server?

Yes, for processing only. Files are automatically deleted within 15 minutes and never shared.

Why is my compressed PDF larger?

If the original was already optimised, compression cannot reduce it further. The tool returns the original in this case.

What is the maximum file size?

PDF24X supports files up to 100MB for compression.