Thumbnail Text Legibility Checker
See whether thumbnail text survives being shrunk onto mobile and TV.
Verdict: Legible across devices
Desktop (168px tall)
45px (legible)
Mobile (≈140px tall)
37px (legible)
TV (≈432px tall)
115px (legible)
About this tool
Type your thumbnail text and headline width to get a per-device legibility verdict — desktop, mobile, and TV. Flags words that will drop below readable point size at 16:9 rendered thumbnails, which is one of the most-asked thumbnail questions on r/youtubers.
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