Xteink Wallpaper Convertor and Optimizer

Hi all,

I got bored and built a small browser tool for getting images onto the Xteink X3 and X4.

You drop in an image and it gives you back a BMP sized exactly to the screen — 528×792 for the X3, 480×800 for the X4. Switching the target device re-renders at the other size, so going X3 → X4 or back is just a toggle.

What's in it:

• Fill or contain, with a zoom slider and drag-to-reposition on the live preview

• Background for the leftover space: black, white, or a mirrored tile so you don't get bars down the sides

• Invert and Floyd–Steinberg dithering

• Export as 24-bit RGB or 8-bit grayscale BMP

• Batch mode — drop in a whole folder's worth and export them all at once

• UI in six languages

Everything runs locally in your browser. No upload, no account, no server — the images never leave your machine.

First version, so I'd like to hear what's missing. Next on my list is proper 16-level grayscale dithering instead of the current pure black-and-white.