Signed

Sign PDFs and fill them in. Open a PDF, drop your signature, a line of text, or today's date anywhere on a page, move and size them, and save a signed copy. Modeled on the signing tools in Apple's Preview, and nothing more. On Omarchy, the interface follows your theme's accent color.

Built with Qt Quick (QML) and the Material style, poppler to show pages, and qpdf to write the signed copy. The C++ side compiles to a single executable with the QML embedded.

Signing

• Signature (or S) places your last-used signature under the mouse pointer, or in the middle of the page you're looking at when the pointer isn't over a page. The menu next to it lists every saved signature by name.
• Text (or T) places a text box starting at the mouse pointer and starts editing it. Shift+Enter starts a new line; Enter or Esc finishes. A text box left empty disappears.
• Date (or D) places today's date in your locale's format, as ordinary text you can edit.
• Drag anything to move it, and drag its corner to scale it. Signatures and text remember the size you last gave them.
• Double-click text to edit it again.
• Save signed copy… (Ctrl+S) writes a new PDF beside the original, named <name>-signed.pdf by default.

The original PDF is never changed, and Signed won't save over it. The signed copy keeps the original pages exactly as they were — text stays selectable, nothing is re-rendered — with your signatures and text laid on top. Placed items stay editable until you close the PDF, so you can fix something and save again.

Signatures

Choose Add signature… in the Signature menu, or drop an image on the window. Use a scan or a well-lit photo of your signature on white paper: Signed removes the paper, keeps the ink (blue stays blue), and crops to it. Slide Paper threshold toward More if shadows show up, or toward Less if faint strokes disappear. PNGs that are already transparent are used as they are. Give it a name like "David" or "Initials".

Signatures are saved as PNGs in ~/.local/share/signed/signatures/ (under $XDG_DATA_HOME if set), named after the signature. Deleting one from the menu doesn't affect anything already placed.

Hotkeys

Letter keys do nothing while you're typing.

Limits

• Password-protected PDFs can't be opened.
• Form fields aren't filled in as fields; place text over them instead.
• Signatures come from images; there's no drawing with the mouse.

Requirements

• poppler-qt6 and qpdf
• noto-fonts (text is set in Noto Sans and embedded in the PDF)
• xdg-desktop-portal and a portal backend for the file picker

Build

Uses Qt's own build tool, qmake6:

./bin/build
./build/signed some.pdf

Run the tests (offscreen) with ./bin/test, and install as an Arch package with ./bin/install.

License

MIT