Skip to content
PDF Tools Japan

Sign PDF – Add Your Handwritten Signature Anywhere on a PDF

A free tool that adds your handwritten signature to a PDF. Draw it in the box with your finger on a phone or your mouse on a computer, or load a photo of your signature written on white paper. Then tap anywhere on the PDF to place it, and choose its size. You can also download the signature as a transparent image.

Your files are processed in your browser and are never uploaded to a server.

How to sign a PDF

  1. 1Under “Draw it”, sign inside the box and tap “Use this signature” (or create it from a photo).
  2. 2Tap “Select a PDF to sign” and choose your PDF.
  3. 3Tap where you want your signature. Drag it to adjust the position, and choose its width.
  4. 4Tap “Create signed PDF”, check the preview, and download.

Supported files and limits

Supported files
One PDF file (.pdf). Draw your signature on screen or use a photo of it (JPG, PNG, WebP)
You get
The signed PDF and your signature as an image (PNG)
File size
Up to 100MB per file
Good to know
  • Password-protected or edit-restricted PDFs can't be processed. Remove the password first with Unlock PDF.

When you need to sign a PDF

Printing a PDF, signing it and scanning it again takes time. With this tool you can sign a PDF directly on your phone or computer.

  • Sign and return application, consent or agreement forms
  • Add your signature to documents from overseas partners
  • Sign the approval field on quotes and purchase orders
  • Add a sign-off to internal requests and reports

Two ways to create your signature

Draw it

Sign inside the box with your finger, a mouse or a stylus. Choose black or blue ink and the pen width. If it doesn’t look right, tap “Clear” and try again as many times as you like.

Use a photo

Photograph your signature written in pen on white paper, then choose the photo. The paper becomes transparent automatically, leaving just your signature. For the best result, take the photo in good light without shadows.

Any position, any size

Just tap the signature field on the PDF to place it. Drag it to adjust the position, and choose a width from 20mm to 80mm. You can add it to several pages or places.

Note: this isn’t a digital signature

The signature added here is an image of your handwritten signature. It’s different from a digital signature, which uses a certificate to prove who signed and that the document hasn’t been changed.

For contracts and other documents that need legal proof, use an electronic signature service or follow the recipient’s instructions. Check your company’s rules on whether signature images are accepted internally.

Related tools

For Japanese documents that need a seal, use the Digital Hanko Stamp maker; to fill in your name or the date, use Add Text to PDF. You can also add a password before sending the signed PDF.

Your signature and PDF are never uploaded

Creating the signature and placing it on the PDF both happen in your browser. Neither your signature image nor your PDF is sent to a server. Signatures aren’t saved on this site, so download the image if you want to reuse it.

Frequently asked questions

Q. Is it free?

A. Yes. It’s free with no usage limits, and no watermark is added.

Q. Can I sign on my phone?

A. Yes. On a smartphone, sign inside the box with your finger.

Q. Can I use a signature written on paper?

A. Yes. Choose “Use a photo” and select a photo of your signature on white paper; the background becomes transparent.

Q. Can I change the signature size?

A. Yes. Choose a width from 20mm to 80mm.

Q. Can I sign several pages?

A. Yes. Switch pages to add your signature to several pages or places.

Q. Can I save my signature?

A. Use “Download signature” to save it as a transparent PNG. It isn’t stored on this site.

Q. Is this a legally binding digital signature?

A. It’s an image of your signature, not a certificate-based digital signature. Where legal proof is needed, use an electronic signature service.

Q. Can I choose the ink color?

A. Yes: black or blue.

Q. Are my signature and PDF uploaded?

A. No. Both are processed in your browser and never sent anywhere.

Q. Do I need to sign up?

A. No. Just open the page and start using it.

Q. Can I sign a password-protected PDF?

A. No. Password-protected PDFs and PDFs with editing restrictions can’t be signed. Unlock them first with Unlock PDF.

Share this tool