Start with Theme Creator.
Open Passcode (.passthm), then Theme Creator. Local creation, export and inspection do not require an iPhone.
1. Choose one picture or individual keys.
Poster Slice uses one picture across the keypad. Individual Keys lets you configure each digit separately. The fixed poster-slicing canvas is 915 × 1148; it is not the Wallet artwork size.
2. Frame the artwork.
For a poster, choose seamless tiles or circular buttons, pan and zoom, and inspect the 0 row and edges. For individual keys, choose each image and adjust its framing.
3. Check all ten digits.
A complete theme needs the intended artwork on digits 0–9. The app can export with fewer keys. The white digits and letters in the preview are overlays, not text automatically written into the artwork.
4. Export and re-import.
Save a new .passthm file, then open it through Apply .passthm and inspect every digit. Keep originals when editing imported themes: export rebuilds the package and may not retain every variant or directory marker.
5. Apply only after checking the device.
Applying requires a connected, unlocked, trusted iPhone and the appropriate language, font and cache target. Importing can change the target selection, so check it again. Follow the documented restart step and inspect the keypad on the actual phone.
What this changes.
These themes personalize keypad artwork. Poster Slice does not set the full lock-screen wallpaper. A successful export or apply result does not prove the theme displayed correctly on an iPhone.