open-pdf-sign
Sign PDF files digitally from CLI
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CLI tool to digitally sign PDF files using existing certificates, with optional visible signatures.
- for
- Developers who need to add cryptographic signatures to PDFs via command line or web server.
- pricing
- free
- license
- Apache-2.0
- v0.3.0v0.3.0 TSA proxy support, Java 11, dependency upgradea year ago
- v0.2.1v0.2.1 Allow signing password-protected PDFs2 years ago
- v0.2.0v0.2.0: Allow only displaying image3 years ago
Key features
- PAdES signatures — Create PAdES-B, PAdES-T, PAdES-LT or PAdES-LTA signatures for PDF authenticity.
- Visible/Invisible signatures — Add invisible signatures by default or customize visible signatures with images and text.
- Nginx integration — Automatically sign PDFs served by an Nginx server on the fly.
- Node.js module — Use the npm package to sign PDFs within Node.js applications.
- Cross-platform Java CLI — Runs on Windows, Linux and macOS with Java 11+.
- Open source license — Released under Apache 2.0, free to use and modify.
Use cases
- Sign PDFs generated by a web service before they are downloaded by users.
- Add a corporate logo as a visible signature on legal documents.
- Automatically sign every PDF served by an Nginx server to prove origin.
- Integrate PDF signing into a Node.js backend for on-demand document generation.
open-pdf-sign FAQ
What is open-pdf-sign used for?+
It automatically signs PDF documents, either individually via CLI or automatically on a web server.
Do I need a special certificate?+
No, any existing certificate/key can be used, including domain certificates like Let's Encrypt.
Which platforms are supported?+
It runs on Windows, Linux and macOS as a Java application (JRE 11+).
Can I add a visible signature with my own logo?+
Yes, you can include custom images and text for visible signatures using command-line options.
Is open-pdf-sign open source and free?+
Yes, it is released under the Apache 2.0 license and can be used and distributed freely.
Summarized by DevHunt from openpdfsign.org · Oct 4, 2026. Details may change; check the official site.
