Compress PDF

Reduce file size while balancing output quality

Drop PDF here

or select a file from your device

Supported: .pdf

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Low Compression
Best quality, larger file
Balanced
Recommended overall output
High Compression
Smaller file, lower detail

Compression Completed

Your compressed PDF is ready.

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Compressing PDF...
Compression Notes
Low compression keeps the best readability.
Balanced mode is good for general sharing.
High compression is useful for strict size limits.

Compress PDF Files Online — Complete Guide

Large PDFs slow down email, uploads, and cloud sync. PdfPeaks compresses PDF files in your browser so you can share reports, scans, and presentations faster while keeping text readable. Choose a compression level that balances file size and visual quality for your workflow.

How It Works

Compression is straightforward. Upload your PDF, pick a level — low for minimal quality loss, balanced for everyday use, or high for maximum size reduction — then run the job. The tool analyses images, fonts, and embedded objects to produce a smaller downloadable PDF. You can rerun with a different level if the first result is too large or too soft.

  • Step 1 — Upload: Drag and drop or browse to select your PDF (up to 100 MB).
  • Step 2 — Choose level: Start with Balanced for most documents; use High for image-heavy scans.
  • Step 3 — Download: Compare file size on the results screen and save the compressed PDF.

Security & Privacy

We treat uploaded files as sensitive data. When you use the PDF compression tool on PdfPeaks, files are transferred over encrypted HTTPS/TLS connections and processed on secure servers in isolated temporary storage. They are used only to perform the operation you requested. Uploaded files and outputs are not permanently stored, are not used to train machine-learning models, and are never sold or shared with third parties for marketing. Temporary files are automatically removed after processing. For full details, see our Privacy Policy and Terms of Service.

Common Use Cases

Professionals, students, and everyday users rely on this tool for tasks such as:

  • Email attachments: Meet provider size limits without removing content.
  • Web publishing: Speed up downloads for brochures, menus, and product sheets.
  • Mobile sharing: Send lighter files over messaging apps and slow connections.
  • Storage savings: Reduce backup and cloud storage usage for scan archives.
  • Print shops: Submit smaller prepress files while keeping legible text.

Tips for Best Results

Scanned PDFs compress well but may look softer at High settings — preview before sending to clients. Combine with Merge PDF if you need one file from several sources first. Supported format: PDF (.pdf).

Frequently Asked Questions

Our algorithm minimises visible quality loss. You can choose compression level (low, medium, high).

Files up to 100MB are supported.

Most PDFs can be reduced by 50-90% depending on their content.

Our compression is optimized to maintain readability while reducing file size.

Yes, all files are deleted immediately after compression.