What is a YouTube title checker?
A YouTube title checker measures your draft title against the character limits that actually govern how much of it appears in search results and suggested videos — not the 100-character field limit YouTube technically allows, but the shorter, practical threshold before truncation kicks in.
Where the 60-character rule comes from
YouTube allows titles up to 100 characters, but search results and suggested-video panels don't display anywhere near that much. Desktop search results generally show around 60 to 70 characters before truncating with an ellipsis; on mobile, where the majority of watch time happens, that shrinks further.
The practical implication is that anything after roughly character 60 is a gamble — it might show, or it might get cut, depending on the viewer's device and where your video appears (search versus suggested versus a playlist). Front-load the part of your title that actually explains the video; treat anything past 60 characters as a bonus that some viewers will see and others won't.
This checker mirrors that threshold: green means you're safely within what most placements display in full, amber means you're in the zone where mobile truncation becomes likely, and red means the title will visibly cut off in most placements.