A video that is underperforming rarely tells you why. Studio reports impressions, click-through rate and the retention curve, and none of those mention that your title is cut off two words before the keyword, or that the eleven timestamps in your description are producing no chapters at all. Metadata failures are silent: no warning at upload, no flag afterwards, which is how one mistake survives across a whole library.
An audit is the deliberate act of checking each field against the number that governs it, one video at a time, in about ten minutes. This article is that pass done by hand — what to look at, the threshold that decides pass or fail, and what each failure costs. Every number below is the one the video audit applies, so you can work through it yourself or paste the URL and read the same findings back.
Audit a published video, not a draft. Everything here is public, so the pass works on a competitor's video as well as your own.
The title has two cut-off points, not one
YouTube rejects any title over 100 characters, so nothing you published is longer than that. The limits that matter are lower, and neither is documented.
- 70 characters. Roughly what search results and the suggested column display. Past that the title is truncated.
- 40 characters. Roughly what the mobile home feed shows across two short lines. Most YouTube watch time is mobile, so this is the version most people judge.
Read your title at 70 characters, then again at 40. If the phrase people search for has fallen off the shorter version, the problem is ordering rather than length — a 92-character title whose point lands inside the first 40 costs you nothing but the tail, which is why the audit calls it a warning rather than a failure. Editing a title does not reset the video's performance.
Under 20 characters is almost always a title that never got its keyword, and a title set entirely in capitals reads as shouting. When the reorder is not obvious, the title generator produces variants built around the same phrase, and the titles guide covers what belongs in those first 40 characters.
Open the video in the YouTube mobile app before deciding a title is fine. The desktop watch page shows all 100 characters, which is exactly why titles that fail at 40 get published by people who checked.
The description is read by two audiences with different budgets
- The first 157 characters are the snippet YouTube and Google show under your title in search results. Spend it on a greeting and it says nothing about the video.
- The first 120 characters or so are what the watch page shows before the "…more" fold. Almost nobody expands past it.
- 250 characters is a floor, not a target. Below it there is too little text for search to classify the video, and the field holds 5000.
Read your first 157 characters cold. If they do not say what the video covers and who it is for, rewrite that opening and leave the rest alone; the description guide has a structure for everything below it.
A description with no links is also a finding: that box is where your next video, your playlists and anything you sell get found.
Three rules decide whether chapters appear at all
Chapters are the most valuable thing in a description and the easiest to break, because YouTube enforces three rules and announces none.
- The first timestamp must be 0:00. Not 0:05, not 0:12.
- There must be at least three timestamps. Two stamps produce no chapter list at all.
- No two consecutive timestamps may sit less than ten seconds apart. One pair too close invalidates the whole set.
The trap is that a timestamp anywhere in the description counts. A line reading "at 4:12 I explain the export settings" is a stamp, and if it lands eight seconds after the previous one it takes the whole list down. Keep stamps on their own lines and loose times out of your prose. Videos under two minutes are the exception.
There is no error message for a broken chapter list. The description looks correct, the timestamps are all present, and the video simply has none — which is how one stray time in a sentence breaks a list for a year. Check the progress bar: if it is not divided into segments, the list is not working.
Hashtags are counted across the whole video
The limit is 15, and it applies to the title and description together, not to each field separately. Past 15, YouTube ignores every hashtag on the video — a cliff, not a taper.
Only the first three render above the title in blue. Choose them deliberately — niche, format, topic — and treat the rest as weight carried towards the cliff. The tags versus hashtags comparison covers which field does what.
Tags spend a 500-character budget that counts the separators
Every tag shares a single budget of 500 characters, and the separators between them count against it. Tag lists never add up the way people expect: twenty tags averaging 24 characters is 480, plus 19 separators is 499, and the twenty-first is dropped when you save.
Fewer than five tags leaves most of the budget unspent, and tags earn their keep on spellings and phrasings that are not already in the title.
One caveat on someone else's video: an empty tag list is not proof they used none, because some channels hide the field. The tag extractor reads the tags a public video shipped with — worth more as a read on a topic's vocabulary than as a list to copy.
A thumbnail either exists or YouTube picked one for you
A custom thumbnail is stored at 1280 × 720. If the largest version YouTube reports is smaller than that, no custom thumbnail was ever uploaded and the platform is showing a frame grabbed out of the video.
It is the cheapest finding on the list to fix and common on older uploads: upload one at 1280 × 720 and the video keeps everything it has earned. The thumbnail downloader shows which sizes exist for any video, and the thumbnail guide covers designing for the 320-pixel width where most people see it.
Fix worst first, using one number per field
The whole pass in one table:
| Field | The number | What crossing it costs |
|---|---|---|
| Title | 100 cap, ~70 in search, ~40 on mobile | The keyword falls off before anyone reads it |
| Description opening | 157 characters | The search snippet describes nothing |
| Description length | 250 minimum, 5000 allowed | Too little text to classify the video |
| Chapters | first at 0:00, 3 minimum, 10 seconds apart | Miss one rule and YouTube shows none |
| Hashtags | 15 across title and description | Past 15, every hashtag is ignored |
| Tags | 500 characters including separators | Tags past the budget are silently dropped |
| Thumbnail | 1280 × 720 | Below it, YouTube is showing a video frame |
The audit turns that into one score by weighting each finding — a failure counts zero, a warning a half, a pass one — and averaging across every check. 90 or above is Strong, 70 or above is Good, with gaps, 50 or above is Needs work, and below that is Losing views. Every finding that is not a pass links to the tool that fixes it.
Work in that order of effort against return: thumbnail first, since it is one upload; then chapters, usually a one-line edit; then the title, a reorder; then the description opening; then tags and hashtags. Change one field, wait two weeks, and read the result against the same traffic source before changing the next.
The short version
- Read your title at 70 characters and again at 40. If the keyword is gone by 40, reorder rather than shorten.
- The first 157 characters are the search snippet and the first 120 are what viewers see. Write those.
- Chapters need a stamp at 0:00, at least three stamps, and ten seconds between each. Miss one rule and you get none.
- Fifteen hashtags across title and description is a cliff. Past it every one is ignored, and only three ever show.
- Tags share 500 characters including the separators. Fewer than five wastes the field; too many get dropped.
- A largest thumbnail under 1280 pixels wide means no custom thumbnail was uploaded. Fix that first.
