Mass Twitch Username Checker
Twitch may still block some names from being claimed.
How does it work?
Paste up to 500 usernames, one per line, and press Start. The names go to a small server of ours in batches, which asks Twitch's public API whether an account exists for each one. Names Twitch does not return as existing accounts are listed under Available; everything else is taken.
Lines that cannot be a Twitch username are skipped before anything is sent: Twitch names are 4 to 25 characters of letters, digits and underscores, and cannot start with an underscore. The skipped lines are shown so you can fix them.
Available is not a guarantee. Twitch reserves some words, blocks offensive or impersonating names, and keeps recently renamed or deleted names on hold for a time. The only sure test is trying the name on Twitch itself. Only the names you paste are sent, nothing is stored, and the scan runs in your browser one batch at a time so you can stop it whenever you like.