Sign PDFs on Linux

Signing PDFs on Linux has traditionally been a frustrating experience. Unlike Windows and macOS, Linux does not have widely available commercial PDF signing software. Adobe Acrobat is not available for Linux at all. Tools like LibreOffice Draw can technically add images to PDFs, but they are not designed for signatures and the workflow is awkward. Some users resort to command-line tools like pdfsig or xournal, which require installation and technical knowledge. SigPDF eliminates all of this complexity. It is a browser-based PDF signing tool that works in any modern browser on any Linux distribution. Open Firefox or Chrome, navigate to SigPDF, upload your PDF, and sign it. That is it. No packages to install, no dependencies to resolve, no flatpaks or snaps to configure.

SigPDF works identically across every Linux distribution. Whether you are running Ubuntu, Fedora, Debian, Arch Linux, openSUSE, Linux Mint, Pop!_OS, Manjaro, elementary OS, or any other distro, the signing experience is exactly the same. The tool runs entirely in the browser using client-side JavaScript, so it does not matter what desktop environment you use (GNOME, KDE Plasma, Xfce, or anything else) or which package manager your distribution relies on. If your system has a modern web browser, SigPDF works. This universality is especially valuable for Linux users who frequently switch between distributions or maintain multiple machines with different setups.

For Linux professionals who value privacy and security, SigPDF offers a significant advantage over cloud-based signing services. Your PDF is processed entirely within the browser and never leaves your machine. There is no server-side processing, no file upload, and no data retention. This is particularly important for developers, sysadmins, and security researchers who may be signing NDAs, employment contracts, or other confidential documents. The tool also works behind corporate firewalls and VPNs, since all processing is local. Once the page is loaded, SigPDF operates without further network requests, making it functional even in air-gapped or restricted network environments.

SigPDF provides three signature methods on Linux: draw with your mouse or touchpad, type your name with a handwriting font, or upload an image of your existing signature. You can add multiple signatures, text fields, dates, and initials to any page of a multi-page PDF. The interface is responsive and works well at any screen resolution, from a laptop display to a multi-monitor desktop setup. When you finish signing, the PDF downloads directly to your Linux file system. You can then email it, upload it to a document management system, or print it if needed. SigPDF is compatible with Firefox, Chrome, Chromium, Brave, Vivaldi, and any Gecko or Chromium-based browser available on Linux.

Step-by-Step: Sign a PDF on Linux

1. Open Firefox, Chrome, or any browser on your Linux machine
2. Navigate to SigPDF and drag your PDF into the editor, or click to browse your file system
3. Scroll through the PDF to find the page that needs a signature
4. Draw your signature with your mouse or touchpad, type your name, or upload a signature image
5. Click on the document to place your signature, then drag to reposition or resize
6. Add additional text, dates, initials, or signatures on other pages
7. Click “Download” to save the signed PDF to your Linux file system