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Compress PDF

Reduce PDF file size — 100% client-side, nothing uploaded.

Click or drag PDF files here

Supports any PDF file

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100% Client-Side

Your PDFs are processed entirely in your browser. Nothing is uploaded to any server.

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Blazing Fast

Powered by WebAssembly-optimized libraries for near-instant processing.

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Private & Secure

No data leaves your device. Your files stay on your machine.

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Mobile Ready

Fully responsive interface works seamlessly on any device.

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Batch Processing

Process multiple files at once with merge and bulk operations.

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Completely Free

No sign-up, no limits, no watermarks. Free forever.

Free Online PDF Compressor & All-in-One PDF Toolkit

PDF files are the backbone of professional document exchange — from academic papers and tax forms to design mockups and legal contracts. But working with PDFs often requires expensive software or risky online tools that upload your sensitive data to unknown servers.

Our PDF Compressor & Toolkit solves this by providing 10 essential PDF operations — compression, merging, splitting, rotation, page extraction, page removal, watermarking, metadata editing, page reordering, and document protection — all running 100% client-side in your browser. Your files never leave your device.

How to Compress a PDF Online in 3 Steps

  1. Upload Your PDF: Click the upload zone or drag-and-drop your PDF file into the browser. The file is loaded instantly into memory — nothing is sent to a server.
  2. Choose Compression Level: Select from three quality presets — Extreme (maximum size reduction), Recommended (optimal balance), or Less (minimal compression, best quality).
  3. Download the Result: Click the compress button and download your optimized PDF. The tool restructures internal object streams and strips redundant metadata to minimize file size.

10 Powerful PDF Tools in One Interface

  • 📦 Compress: Reduce PDF file size by restructuring internal objects and stripping unnecessary metadata.
  • 🔗 Merge: Combine multiple PDF documents into a single file. Reorder files before merging.
  • ✂️ Split: Break a PDF into individual pages (ZIP download) or extract a specific range of pages.
  • 🔄 Rotate: Rotate all pages by 90°, 180°, or 270° clockwise. Perfect for fixing scanned documents.
  • 📄 Extract Pages: Pull specific pages from a PDF using flexible range syntax (e.g., 1, 3-5, 8).
  • 🗑️ Remove Pages: Delete unwanted pages from a document while keeping the rest intact.
  • 💧 Watermark: Add customizable text watermarks with adjustable opacity and font size.
  • 🏷️ Metadata Editor: Set or override the document title, author, subject, and keywords.
  • ↕️ Reorder Pages: Drag-and-drop to rearrange pages in any order before exporting.
  • 🔒 Protect: Restructure and flatten the PDF with optimized object streams for basic protection.

Why Client-Side Processing Matters for Your Privacy

Most "free" online PDF tools upload your documents to remote servers for processing. This is a serious security risk, especially for sensitive documents like tax returns, medical records, legal contracts, and academic assignments.

Our tool uses pdf-lib, a pure JavaScript library that processes PDFs entirely within your browser's sandboxed environment. This means:

  • Zero Network Requests: Your PDF data never touches any server. Open your browser's Network tab to verify.
  • Offline Capable: Once loaded, the tool works even without an internet connection.
  • GDPR Compliant by Design: Since no data is collected or processed remotely, there are zero data privacy concerns.

For other privacy-focused tools, check out our Secure Password Generator and AcadShare temporary file sharing.

Frequently Asked Questions

Is my PDF uploaded to a server?
No. All processing happens entirely inside your browser using JavaScript. Your files never leave your device, ensuring complete privacy and security.
How much can the compressor reduce PDF size?
The compression works by re-structuring the PDF, removing redundant metadata, and using object streams. Results vary depending on the original PDF — documents with embedded fonts and images typically see the best size reductions, often between 10-40%.
Can I merge more than two PDF files?
Yes! You can add as many PDF files as you want. Simply keep dragging or selecting files, reorder them as needed, and merge them all into a single PDF with one click.
What does the watermark tool do?
The watermark tool overlays custom text (like 'CONFIDENTIAL' or 'DRAFT') diagonally across every page of your PDF. You can adjust the opacity, font size, and text content to suit your needs.
Can I split a PDF into individual pages?
Yes. The split tool offers two modes: split every page into a separate PDF (delivered as a ZIP download), or extract a specific range of pages into a new PDF.
Does the tool work on mobile devices?
Absolutely. The PDF Compressor is built with a mobile-first design philosophy. All features including drag-and-drop, file upload, and processing work seamlessly on smartphones and tablets.
Is there a file size or page limit?
There is no hard file size or page limit. However, very large files (100+ MB) may take longer to process since everything runs in your browser's memory. For best performance, close other tabs when processing very large PDFs.