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About this tool
Measure title length against the 100 character limit and check that thumbnail text adds a new idea instead of repeating the title.
The Thumbnail Title Length Tester measures a video title against the 100 character title field and the roughly 60 characters a listing shows before it truncates, then compares the title's content words with the words burned into the thumbnail. It reports what percentage of the thumbnail's wording the title already carries, which words appear only in one place, and whether the thumbnail text is still legible once the image is scaled to the 210 pixel search-result size. Aimed at creators and editors deciding whether a thumbnail is adding a second idea or just echoing the first.
Open Thumbnail Title Length Tester on AltFTool — it loads instantly in your browser.
Add your input to the workspace.
Adjust the options until the result looks right.
Copy or download the output and put it to work.
Reports the exact words shared between title and thumbnail after stopwords and plurals are folded.
Derives the minimum canvas font size from the smallest display width rather than quoting a rule of thumb.
Renders the part of the title that survives truncation so you can see what a viewer actually reads.
100 characters is the hard limit of the title field. Practical length is much shorter: desktop search and the suggested-video rail clip titles with an ellipsis at roughly 60 characters, so the hook needs to land well before the limit.
Around three to five words. Past that the phrase stops being scannable at the size a thumbnail is actually displayed, and the words compete with the image for the same fraction of a second of attention.
At least about 61px. A desktop search-result thumbnail is roughly 210 pixels wide, so canvas text is scaled by 210/1280; to land at the ~10 pixel floor where bold display text is still readable you need 10 x 1280 / 210, which rounds up to 61px.
No. The title and the thumbnail are shown together in every listing, so repeating a word spends two slots on one idea. Use the thumbnail for the thing the title cannot say - a result, a face, a number, a contradiction - and this tool reports what share of the thumbnail's words the title has already used.