v20260920

BIP39 Number & Word Lookup — v2026.09.20

First update in a year.

Type a BIP39 word, a number, or the first 4 letters of a word. After 4 letters the tool fills the full word and its index. Those prefixes are unique on the official English list, so it works with Seedpill, SatoshiSticks, and other draw tools that only show the start of the word.
The first 4 letters are marked in the result so you can check a 4-letter note against the full word. Number lookup and 0-based / 1-based mode are unchanged.
SHA-256:
98D39DE6FF6F9D5E1EC769828338E31B0A6E45841754AA68F584A20EB367FA90

v2025126

• added a copy icon to copy the word result to clipboard
• improved the lever and slider to work more smoothly
• improved the html code to load faster (footer)
• added a "download" button to download the page more easily to the user's computer
• few UI improvements for mobile, so the virtual keyboard doesn't overlap the "find word" button anymore
• 2 bug fixes