DocSigner: sign PDFs in your browser · vanrossum.dev    

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DocSigner: sign PDFs in your browser
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 ![](https://vanrossum.dev/images/jeffrey-portrait.webp) By Jeffrey van Rossum

  vanrossum.dev  

  [      vanrossum.dev ](https://vanrossum.dev)                      

  [ ← Writing ](https://vanrossum.dev/posts)   [ ← Writing ](https://vanrossum.dev/posts) [ DocSigner ](#docsigner) [ How it's built ](#how-its-built) [ Try it ](#try-it) 

I needed to sign a multi-page PDF and didn't want another DocuSign-style account, email flow, or "upload your document to our cloud." So I built a tiny free tool instead.

DocSigner
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[DocSigner](https://docsigner.vanrossum.dev) runs entirely in the browser:

1. Drop in a PDF
2. Draw your signature (and initials if you need them)
3. Click to place them on any page, optionally on all pages at once
4. Download the signed file

Nothing is uploaded. The PDF never leaves your device. No account, no watermark.

It's useful for the boring everyday stuff: contracts, NDAs, invoices, forms. Whenever you just need a mark on the page and not a full e-sign product.

How it's built
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React + Vite, with [pdf.js](https://mozilla.github.io/pdf.js/) for rendering and [pdf-lib](https://pdf-lib.js.org/) for stamping the signature into the file. Hosted on Cloudflare Pages. Source is on [GitHub](https://github.com/jeffreyvr/docsigner) if you're curious.

While I normally review AI-generated code, in all honesty this was entirely vibe-coded with [Grok 4.5](https://x.ai). Just a couple of prompts.

Try it
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→ **[docsigner.vanrossum.dev](https://docsigner.vanrossum.dev)**

If it saves you a few minutes, a follow on [X](https://x.com/jeffreyrossum) is always appreciated.

  ![](https://vanrossum.dev/images/jeffrey-portrait.webp) Jeffrey van Rossum [@jeffreyrossum](https://x.com/jeffreyrossum) 

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   © 2026 Jeffrey van Rossum 

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