YouTube Title and Description Character Limit: The Exact Numbers

YouTube allows a video title of up to 100 characters and a description of up to 5,000 characters. Both numbers are technically accurate and both are somewhat misleading on their own, because the practical, actually-visible length in most places viewers encounter them is considerably shorter than either limit suggests.

Title: The Technical Limit vs. What Actually Displays

Context	Practical visible length
Desktop search results	~60-70 characters before truncation
Mobile search results	~50-55 characters before truncation
Suggested/recommended video thumbnails	~40-60 characters, depending on screen size
Video watch page itself	Full 100 characters, wraps to multiple lines

This means the technical 100-character limit is really only fully visible on the watch page itself — everywhere a viewer is deciding whether to click in the first place (search, suggested videos, mobile), the effective limit is closer to 50-60 characters. A title's most important words need to land within that window, not just anywhere within the full 100.

Description: Only the First ~100-150 Characters Do Most of the Work

The 5,000-character description limit is generous enough for detailed show notes, timestamps, links, and credits — but only the first roughly 100-150 characters display above the "Show more" fold on both desktop and mobile before a viewer has to actively click to expand it. Most viewers never click "Show more," which means everything beyond that initial visible portion functions more as reference material and SEO context than as content most viewers will actually read.

A 5,000-character description isn't really one block of text — it's a short, high-visibility opening (roughly 100-150 characters) followed by a much longer, mostly-unread body that still matters for search and for viewers who do choose to expand it. Treating both parts the same way wastes the value of the visible opening.

What Belongs in the Visible Opening of a Description

Since the first 100-150 characters are what most viewers and YouTube's own search snippet actually display, that opening should state clearly and specifically what the video covers — ideally including the primary search term or phrase a viewer might use to find it — rather than opening with a channel intro, a sponsor mention, or a generic greeting that pushes the actually useful information below the visible fold.

What Belongs in the Rest of the 5,000 Characters

The remaining space — timestamps, links to related videos or resources, credits, hashtags, a fuller written summary — still contributes to how YouTube's search and recommendation system understands and categorizes a video, even though most viewers won't read all of it directly. It's worth filling out thoroughly for that indexing value, just not at the expense of a clear, specific opening.

Tags and Hashtags: A Separate, Smaller Consideration

Hashtags placed in a description (up to 15 recognized by YouTube, with the first three displayed above the video title) and the separate tags field both contribute to discoverability but operate independently of the title and description character limits themselves — worth checking as a final step, but not something that eats into the title or description length budgets directly.

How This Compares to Other Platforms

YouTube's title behaves similarly to the truncation patterns seen on other platforms — a generous technical limit with a much shorter practically-visible window, the same underlying pattern covered for LinkedIn headlines and across platforms generally in character limits by platform. The description's "visible opening plus long tail" structure, however, is more distinctive to YouTube specifically.

Checking a Title and Description Before Publishing

Since the practically visible length matters more than the technical limit for both fields, checking a draft title against roughly the 50-60 character mark, and a description's opening against the 100-150 character mark, is more useful than checking only against the full 100 or 5,000-character technical maximums. A character counter makes it straightforward to check exactly where a draft falls at each of these specific, practically meaningful length points.

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YouTube's 100-character title and 5,000-character description limits are technically accurate but not the number that actually matters most in practice — a much shorter visible window governs both, in search results, thumbnails, and the description's "Show more" fold. Writing with those shorter, practical windows in mind, rather than the full technical limits, makes better use of exactly the space viewers actually see before deciding whether to click or keep reading.