Linux PDF signing has historically been awkward — Master PDF's free tier limits features, Okular's signature support is basic, and command-line approaches require GPG and key infrastructure. For a quick visual signature, the browser is the most direct path.
Visual signatures in Flint
Flint's signer in Firefox or Chrome on Linux: upload PDF, click Sign, draw with mouse, trackpad, or stylus, place on document, download. Five minutes from PDF in inbox to signed PDF in Downloads.
Works identically across Ubuntu, Fedora, Arch, anything that runs a modern browser.
Stylus and Wacom support
If you've got a Wacom tablet or pen-equipped device on Linux (configured via libinput), Flint's signature pad accepts pen input with pressure sensitivity. The signature looks more like real handwriting than mouse-drawn lines.
Cryptographic signatures vs. visual
Visual signatures (drawn signatures, image stamps) are what most everyday contracts need. Cryptographic signatures (GPG, X.509 certificates with verification) are a different thing — handled by tools like Adobe Reader for Linux (limited) or open-source PKI workflows. For everyday signing, visual is enough.
FAQ
Is a drawn signature legally binding on Linux-sent contracts?
Yes — e-signature laws (eIDAS in EU/UK, ESIGN in US) don't care which OS produced the signature. Clear intent plus a reproducible mark generally counts. Same standards as Windows or Mac.
Can I use Flint via terminal?
No — Flint is a web app, not a CLI tool. For CLI signing on Linux, look at PortableSigner or open-source PKI utilities.
Will Flint work in a Linux VM?
Yes. Browser-based, no special hardware requirements. Useful for users on Linux in VirtualBox or WSL2 who can run a browser.
Sign without the Wine dance. Open Flint in your Linux browser and get on with it.