Glarity Not Working on YouTube? Causes and Fixes (2026)
Glarity summary not appearing on YouTube, stuck loading, or asking for an API key? The common causes — extension conflicts, YouTube updates, key configuration — and how to fix each.
Quick answer: Glarity failures usually trace to one of three things: the extension's panel did not inject after a YouTube layout change, an API key is missing or exhausted, or another extension is blocking it. Reload the video page first — that resolves the injection case, which is the most common.
1. The summary panel does not appear
Glarity injects a panel into the YouTube page. When YouTube ships a layout change, injection can fail silently and the panel simply is not there.
Fix: reload the page, then update the extension, then restart the browser. Reinstall if it persists. This class of failure affects every extension-based summarizer — see summarizers breaking after updates.
2. API key issues
Glarity can run against your own API key. If it was never set, has expired, or the associated account is out of credit, summaries fail — often with an unhelpful error. Check the extension's settings and confirm the key is present and the underlying account still has balance.
3. Another extension is blocking it
Ad blockers and privacy extensions frequently block the network requests Glarity needs. Disable others one at a time to identify the conflict, or test in a clean browser profile.
4. The video has no captions
Like all transcript-based tools, Glarity needs a caption track. Check for Show transcript under "...more" in the description. If it is absent, no tool will work on that video — see "no transcript available" fixes.
5. It does not work on mobile
Extensions do not run on iOS or standard mobile Chrome, so Glarity is desktop-only by design. Nothing to fix — you need a web-based tool for phone use. See summarizing on iPhone.
Quick diagnosis
| Symptom | Likely cause |
|---|---|
| Panel missing entirely | Injection failed — reload, then update |
| Panel there, error on summarize | API key missing or out of credit |
| Spins forever | No captions, or blocked requests |
| Nothing on phone | Extensions do not run on mobile |
Glarity is a good free option when it works; the fragility is inherent to living inside YouTube's page. If you would rather not troubleshoot an extension again, YT Summarizer is a web app — nothing injected, no API key to manage, works on any device. Five summaries free, then one-time credits from $19 that never expire.
Comparison: YT Summarizer vs Glarity.
Frequently Asked Questions
Why is Glarity not working on YouTube?
Usually the summary panel failed to inject after a YouTube layout change, an API key is missing or out of credit, or another extension is blocking the requests. Reload the video page first — that fixes the injection case, which is most common.
Does Glarity need an API key?
Glarity can run against your own API key. If it was never configured, has expired, or the associated account has no balance, summaries fail — often with an unhelpful error. Check the extension settings.
Does Glarity work on mobile?
No. It is a browser extension, and extensions do not run on iOS or standard mobile Chrome. Phone use requires a web-based summarizer.
Why do extension-based summarizers keep breaking?
They inject into YouTube's page, so any layout change or Chrome extension policy update can break them until the developer patches it. Web apps avoid this class of failure entirely because nothing is injected.
Ready to try YT Summarizer?
Paste a YouTube URL and get structured key points in about a minute.
Start Summarizing →