Turn a photo into an animated signature you can paste into Gmail or Outlook.

It is black and white by design. A colour photograph at this size turns into a smudge in an inbox and a colour signature reads as an advertisement; a graded greyscale one reads as a photograph, and it survives every client that renders it.

Before you start

• Your photo never leaves your device

  The crop, the grading and every frame of the animation are computed in this tab. If you publish, exactly one file is uploaded — the finished 224 by 276 greyscale GIF, because your recipients' mail clients have to load it from somewhere. If you don't publish, nothing is uploaded at all.

• You finish on a computer

  The Gmail and Outlook apps on a phone accept plain text in a signature and nothing else — no images, no formatting, from any tool. Installing this one takes a desktop browser, once.

• In a dark inbox it shows as a white card

  No mail client inverts images. The GIF carries its white background into dark mode, where it sits as a white rectangle. That is true of every image in every signature; there is no version of this that behaves differently.