Bip39 Checksum Failed Some words are shorter than four letters, such as the word “act”. Other words are extended than 4 letters, including “summary”. You can see the entire source code in standalone, offline html file. Alternatively you can check the person css and js information in the web version https://geniusbookmarks.com/story18594462/seed-phrase-wallet-generator-detailed-notes-on-seed-phrase-generator