Free PDF Tool · Edit

Add Signature to PDF

Type your name as an italic text signature (Helvetica Oblique — an italic style, not a cursive script), draw a signature with your mouse/touch, or upload a PNG/JPG signature image, then place it using a position preset, or choose Custom X / Y. There is no live drag placement.

Heads-up on the placement UI. This tool places your signature using a position preset, or optional Custom X / Y values when you choose Custom (measured from the page bottom-left in PDF points, the same units Acrobat uses), plus a signature width. It does not let you drag the signature around on a live preview, nor resize by dragging corner handles — those are common requests but require a full interactive PDF editor in JavaScript, which would blow the bundle size up past what runs smoothly on mobile. Workflow: choose a position (or Custom X/Y), click Process, check the result, and if the position is off, adjust and re-run. Repeat takes 1-2 seconds.
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Drop your files here

or click to browse from your device

Accepts: .PDF

About this Add Signature to PDF

Add a signature to your PDF with our Add Signature to PDF tool. Drop your PDF, then choose Draw, Type, or Upload signature, set the page, position, and signature width, and the signature is embedded directly inside the PDF.

Drawn and uploaded signatures are embedded as images; typed signatures use an italic text style. Useful for signing contracts, forms, agreements, and other PDF documents directly in your browser. This adds a visual signature image or text only; it is not a cryptographic digital signature or certified e-signature workflow.

Your privacy is the default. Your selected files are processed in your browser and are not uploaded to our server; all processing happens client-side using browser PDF libraries such as pdf-lib and PDF.js where needed. Closing the tab clears the working session from this page; downloaded files remain on your device.

This tool is free to use with no signup required. Large files may be limited by your browser’s memory and device performance. Part of PDF Tools Base, a privacy-first collection of 161 PDF utilities. Bookmark the page for next time, and explore related tools in the footer below.

How to use the Add Signature to PDF tool

  1. Drop your PDF onto the upload area.
  2. Choose Draw, Type, or Upload signature method in the controls.
  3. Set the page, position, and signature width.
  4. Click Process and download the signed PDF.

Why use PDF Tools Base?

100% Browser-Based

Add Signature to PDF processes selected files in your browser. Your selected files are processed in your browser and are not uploaded to our server.

No Server Upload, No Signup

Your selected files are processed locally in your browser. No account, no server upload, no email needed.

No Watermark Ever

Outputs are clean. We never stamp our brand or a paywall watermark on your files.

Free to Use

No accounts and no signup. Use the tool as much as you need within reasonable browser limits.

Works on Every Device

Windows, Mac, Linux, iPhone, iPad, Android, Chromebook. Any modern browser.

Built on Open Source

Powered by browser-side PDF libraries such as pdf-lib and PDF.js, depending on the operation.

Common uses for add signature to pdf

Draw signature

Use mouse, touch, or stylus to draw on the signature pad.

Insert a signature

Sign documents with a drawn, typed, or uploaded signature.

Upload signature image

Use a transparent PNG, or a JPG signature image without transparency.

Preset or custom placement

Use a position preset, or choose Custom X/Y and width.

Type signature

Use italic text when drawing is not needed.

Frequently asked questions

Is Add Signature to PDF safe to use?

Yes. Everything happens in your browser. Your selected files are processed in your browser and are not uploaded to our server. Closing the tab clears the working session from this page; downloaded outputs remain on your device until you delete them.

Do I need to register or sign in?

No. No account, no email, no sign-up. Open the page and start using the tool immediately. Free to use, no signup needed.

Is there a watermark on the output?

No. PDF Tools Base never adds a watermark or branding to your output. Your final file is clean — just what you produced from the original.

Is there a file size limit?

There is no fixed limit. Files are processed in your browser, so RAM, page count, and file complexity affect what is feasible. Phones may struggle with large PDFs; try splitting first or use a desktop browser.

Does this work on mobile devices?

Yes. The tool works on all modern mobile browsers: Chrome on Android, Safari on iOS, Firefox, Edge, Brave. The drag-and-drop also accepts files from your phone’s file manager.