Is PDF合并 free? Do I need to register?

Yes, it's completely free. No registration required for most tools. Tools that store personal data (e.g., favorites, conversion history) optionally support login for cross-device sync.

Do I need to install anything to use PDF合并?

No installation needed. Open the web page and use directly. Works in all modern browsers (Chrome, Edge, Firefox, Safari) on both desktop and mobile.

Is my data safe when using PDF合并?

Tools marked "browser-local / no upload" process your files entirely on your device. Server-side tools (e.g., PDF conversion) delete temporary files immediately after processing — no persistent storage.

Are there daily usage limits on PDF合并?

Most pure-frontend tools are unlimited. Tools that consume server resources (format conversion, OCR) have a free daily quota; logging in gives you a higher quota. Check "Remaining today" at the top of the tool page for details.

PDF合并

Click or drag file to this area to upload

Do not upload sensitive data like bank card numbers, passwords, or credit card details

✨ Features

• Merge multiple PDFs into one • Drag to reorder files • Fast and efficient • Files auto-delete after 24h

📖 How to Use

Step 1

Upload multiple PDFs

Step 2

Drag to reorder

Step 3

Click merge and download

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