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ConvertBox

Sign PDF

Add typed, drawn, or uploaded signatures to PDF pages, adjust placement and size, then download the signed document without sending it to a server.

1. Select PDF

📄

Select File

PDF to sign

Max file size: 50MB

or drag and drop · press Enter to browse

2. Create Signature

How to Use

  1. Select the PDF file you want to sign
  2. Choose Draw or Text mode
  3. Create your signature and click "Add Signature"
  4. Click on the PDF preview to place the signature
  5. Repeat steps 3-4 if you need more signatures
  6. Click "Apply Signature" to download the signed PDF

All processing is done in your browser, and files are never sent to a server.

Frequently Asked Questions

No, this tool adds a visual signature overlay. It is not a cryptographic digital signature and may not be legally binding.
Yes, you can create and place multiple signatures on different pages or positions.
You can draw a signature with your mouse/touchscreen or type your name to generate a text-based signature.
No. All operations are processed entirely inside your browser's local sandbox using client-side APIs (like WebAssembly, pdf-lib, or HTML5 Canvas). Your files and data never leave your device.
The tool is completely free with no usage limits. However, since processing occurs in your browser's memory, we recommend keeping file sizes under 50MB (especially for heavy files like PDFs or videos) to ensure stability.
No. All tools on ConvertBox are 100% free. We do not insert watermarks, limit features, or require any registration or payment.
Yes. Once the page and its local library dependencies are loaded in your browser, the conversion logic runs completely offline without needing an active internet connection.

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