Htmlsig
Htmlsig is an open-source software that allows users to sign PDF documents with visible signatures using HTML and CSS. It is lightweight, customizable, and works in all major browsers.
Htmlsig: Open-Source PDF Signature Software
Htmlsig allows users to sign PDF documents with visible signatures using HTML and CSS, offering a lightweight, customizable solution for all major browsers.
What is Htmlsig?
Htmlsig is an open source JavaScript library that allows users to sign PDF documents with visible signatures using HTML and CSS. It provides an easy way to create good looking visible signatures without needing to design them in a graphics editor.
Some key features of Htmlsig include:
- Lightweight at around 5KB gzipped
- Works in all modern browsers including mobile
- Signatures are embedded into the PDF visibly
- Highly customizable with HTML and CSS
- SVG support for resolution independence
- Annotations can be added alongside signatures
- Free and open source under MIT license
Htmlsig signatures become part of the PDF file itself instead of overlaying on top of the document. This allows the signatures to stay intact regardless of PDF readers or printers used to view the file. The signatures are also tamper-evident and will invalidate if the document is modified after signing.
Since Htmlsig uses web standards, signatures can be designed however you like with HTML and CSS. Dynamic data like images, current date, or authentication codes can also be added. The customizable nature combined with small size make Htmlsig a great choice for adding visible signatures to PDFs.
Htmlsig Features
Features
- Create visible signatures in PDF documents
- Customizable signature appearance using HTML and CSS
- Lightweight and works in all major browsers
- Open source and free to use
Pricing
- Open Source
- Free
Pros
Easy to implement electronic signatures
Highly customizable signature design
Platform independent and works across devices
Free and open source
Cons
Limited to visible signatures only
Requires basic HTML/CSS knowledge for customization
Not suitable for advanced electronic signature workflows
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