Is PDF合并 free? Do I need to register?

Most local tools work without registration. Some server-based functions require sign-in and have free usage quotas; check the tool page.

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) retain and clean up files according to the policy and expiry shown on the tool page.

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

Drag to reorder, or use Move up / down. Files merge in this order.

✨ Features

• Merge multiple PDFs into one • Reorder by dragging or buttons • Preview cover thumbnails • Local browser processing, no upload

📖 How to Use

Step 1

Upload multiple PDFs

Step 2

Drag to reorder

Step 3

Click merge and download

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PDF合并

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