✅ 100% Free & Open Source

Stirling PDF — Free PDF Editor & Toolkit (2026)

Edit, merge, split, sign, and convert PDFs for free. All processing happens in your browser — nothing is ever uploaded to any server.

📥 Download Stirling PDF — Free PDF Editor & Toolkit (2026)

Click to download directly from the official website. No ads, no bundled software.

🔧 How to Install

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Step 1: Open your browser and go to stirlingpdf.io — the tool runs directly in your browser

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Step 2: No installation needed — everything works right away

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Step 3: All files stay on your computer — nothing is uploaded to any server

✨ Key Features

✓ Merge and split PDFs
✓ Convert PDF to/from images and Office formats
✓ Add signatures and annotations
✓ OCR text recognition from scanned documents
✓ Compress PDF files for smaller size
✓ All processing is local — no upload needed

🎯 How to Use

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Step 1: Drag your PDF file onto the browser window

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Step 2: Select the operation you want from the menu (Merge, Split, Convert, Sign, Compress, etc.)

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Step 3: Configure any settings for your selected operation

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Step 4: Click the Process button to run the operation

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Step 5: Download the result — your processed file saves to your computer

All the PDF tools you need, right in your browser

Stirling PDF is a comprehensive PDF toolkit with over 50 different operations: merge, split, compress, convert, OCR, sign, encrypt, and more. The best part — all file processing happens locally in your browser. Nothing is ever uploaded to any server, keeping your documents completely private.

FAQ

Is the web version safe for sensitive documents? The online version processes files in your browser using WebAssembly technology. Files are not uploaded to any server. For maximum security, you can also run Stirling PDF locally using Docker.

Is there a file size limit? No. There are no file size limits, no page limits, no daily usage caps, and no watermarks on output files.

Can I install it on my own computer? Yes, a Docker version is available. Install Docker Desktop from docker.com, then run: docker run -d -p 8080:8080 stirlingtools/stirling-pdf. Open http://localhost:8080 in your browser.

Does Stirling PDF support OCR? Yes. You can extract text from scanned documents and images using the OCR tool. It supports multiple languages including English, Chinese, Spanish, and more.

💡 100% Free & Safe

All download links go directly to the official project websites. We never host or modify any files. No registration, no ads, no spyware.