The YouTube Finder is free without any setup, but shared server limits apply (10 searches/minute). With your own free Google API key, searches run on YOUR Google quota — roughly 99 searches per day, independent of everyone else, using YouTube's official API.
Go to console.cloud.google.com and sign in with any Google account.
Click the project selector (top bar) → New Project → give it any name (e.g. "my-youtube-search") → Create.
Menu → APIs & Services → Library → search for YouTube Data API v3 → open it → Enable.
APIs & Services → Credentials → + Create credentials → API key. Copy the key that appears (looks like AIzaSy…).
Click the key → under API restrictions choose Restrict key → tick only YouTube Data API v3 → Save. Now the key is useless for anything else even if it leaks.
Back on the Transcription & YouTube Finder page, click Your API key under the search box, paste the key and save. Done — searches now use your quota.
Only in your own browser (localStorage on this device). It is sent along with your search requests and relayed to Google — it is never saved on our server and never shared with other users. You can remove it anytime with the Remove button on the search page.