YouTube Video Optimization Checklist

Everything you can adjust around a video to help it get clicked, watched and recommended, from titles and thumbnails to chapters, end screens and reviving old uploads.

Andy Woods
Illustration of a checklist being ticked next to a video thumbnail

A video's success is decided mostly by what is in it. But the things around it, the title, thumbnail, description, chapters and end screen, decide whether people find it, click it and keep watching your channel afterwards. This checklist covers each of them, in the order you would deal with them when publishing.

Contents

How YouTube Decides What to Show

YouTube recommends videos that viewers are likely to click and then be glad they watched. In practice, two numbers do most of the work:

  • Impressions click-through rate (CTR): of the people shown your thumbnail, how many clicked. The title and thumbnail control this.
  • Watch time and retention: once they clicked, how long they stayed. The video itself controls this, helped by chapters and a good opening.

The two have to agree. A thumbnail that promises something the video does not deliver gets clicks and then loses viewers fast, and YouTube stops recommending it. Everything in this checklist either earns the click honestly or keeps people watching after it.

Research: Pick the Question First

Before titles and thumbnails, decide what search or interest the video serves.

  1. Type your topic into YouTube search and read the autocomplete suggestions. These are real searches.
  2. Look at the top results. If they are all from huge channels and closely match the query, pick a narrower version of the question.
  3. Check your own YouTube Studio: Analytics → Reach → traffic source "YouTube search" shows the searches that already find your channel.

Build clusters, not one-offs. Five videos on closely related questions ("index funds vs ETFs", "how to pick an index fund", "index funds in an ISA") help each other: viewers of one get recommended the others, and YouTube learns what your channel is about faster than it would from five unrelated topics.

Titles

A title has two readers: a person scrolling past, and YouTube's systems working out what the video is about. It has to work for both.

  • Lead with the thing people search for or care about. Titles over roughly 60 characters get cut off in many places, so the important words go first. The hard limit is 100 characters.
  • Make a specific promise. "How to Budget" is vague. "The 50/30/20 Budget, Explained With a Real Salary" says exactly what the viewer gets.
  • Leave a gap, not a lie. Curiosity works ("The Mistake That Cost Me My First Rental"), but the video must pay it off, early.
  • Match the thumbnail, do not repeat it. The two should work together. If the thumbnail says "£40,000 in 11 months", the title does not need to say it again.

To see where your title gets cut off and catch common problems, try the free YouTube title checker.

Formats that consistently work:

Format Example
How to + specific outcome How to Pay Off a Credit Card Faster Without Earning More
Number + specific topic 7 Tax Mistakes First-Time Landlords Make
X vs Y Index Funds vs Managed Funds: Which Costs More Over 30 Years
Why + surprising fact Why Supermarkets Put Milk at the Back of the Store
I tried / tested I Tested 5 Budget Apps for a Month. Only One Was Worth It

Avoid titles in all capitals, several exclamation marks, or claims the video does not back up. They may raise clicks once, but they lower retention and trust.

Thumbnails

A thumbnail is seen small, for a fraction of a second, next to a dozen others. Design for that.

  • One idea. One subject, one piece of text, one emotion. If it needs explaining, it is too busy.
  • Three to five words at most, large enough to read on a phone. Many good thumbnails have none.
  • Strong contrast. Bright subject, plain or dark background. Check it at the size of a postage stamp.
  • A face, if you have one. Clear expressions draw the eye. For faceless channels, use a striking object, a chart or a before-and-after instead. See the faceless channel guide.
  • A consistent style across the channel, so returning viewers spot your videos.
  • Leave the bottom right clear. YouTube places the video length there.

Technical requirements (YouTube Help): a verified account, JPG or PNG, 16:9 for regular videos (up to 3840 × 2160, at least 640 pixels wide) and 9:16 for Shorts. The file size limit is 2 MB when uploading from a phone and 50 MB from a computer.

Testing Titles and Thumbnails

YouTube's own Test & compare tool lets you try up to three titles, three thumbnails, or combinations, on the same video. After the test, the version with the most watch time is shown to everyone (YouTube Help).

Things to know:

  • It is only available in YouTube Studio on a computer, and needs advanced features enabled.
  • It does not work on Shorts, scheduled live streams or Premieres (Premieres become eligible once they finish).
  • It judges by watch time, not clicks. A version that gets more clicks but loses viewers faster can lose.
  • Results are in YouTube Analytics under the Reach tab.

To learn something from a test, change one thing at a time: the text on the thumbnail, or the image, or the title, not all three. Testing tiny variations on a video with little traffic rarely gives a clear answer, so save tests for videos that get steady impressions.

Descriptions

Most viewers only see the first line or two before "...more", so:

  1. First two lines: what the video covers, in plain words that include the main search term. This is also what shows under the video in search.
  2. Then: chapters (see below), links you mention in the video, and credits.
  3. Then: anything else: related videos, your newsletter, social links.

Credit licensed music and footage here, in the format the licence requires. The CC BY attribution guide has the exact wording. If there are affiliate links, say so clearly.

InkSlop can draft a title and description from your script, and fills in the credits for any CC BY music or footage from its library. Read the draft and make the first line your own.

Tags and Hashtags

YouTube says it plainly: "tags play a minimal role in your video's discovery", and the title, thumbnail and description matter more (YouTube Help). Tags are mainly useful for common misspellings of your topic. Add a few and move on.

Hashtags are different. Up to three appear above the title and link to pages of other videos with the same hashtag. Use one to three that describe the topic.

Chapters

Chapters split a video into labelled sections on the progress bar. They help viewers jump to what they want, which keeps them watching rather than leaving, and chapter titles can appear in search results.

To add them, put timestamps in the description (YouTube Help):

  • the first timestamp must be 00:00,
  • there must be at least three, in order,
  • each chapter must be at least 10 seconds long.

The free chapter timestamp generator formats your list and checks all three rules.

Name chapters by what the viewer gets ("How much to put in each fund"), not by vague labels ("Part 2"). YouTube can also create chapters automatically. Check them, because they are often generic.

Captions

YouTube creates automatic captions, but they make mistakes with names, numbers and technical terms. Uploading a correct caption file, or fixing the automatic one, makes the video accessible to people who are deaf or hard of hearing, helps viewers who do not speak the language well, and gives YouTube an accurate transcript of what was said.

If your narration comes from a script, you already have the text: in YouTube Studio's Subtitles section you can paste it in and let YouTube time it to the audio. InkSlop videos also have burned-in captions timed to the narration. Which caption file to upload, and how SRT and WebVTT differ, is covered in our subtitle formats guide.

End Screens and Cards

End screens appear in the last 5 to 20 seconds of a video, with up to four elements: videos, playlists, a subscribe button, or a link. The video has to be at least 25 seconds long (YouTube Help).

  • Point to one specific next video, the one a viewer of this video is most likely to want, rather than "best for viewer" on every upload.
  • Leave the last 10 to 20 seconds of the video visually quiet so the elements do not cover anything important.
  • Say it out loud: "If this helped, the next video covers..." works better than a silent box.

Cards are small prompts during the video. You can add up to five, linking to a video, playlist or channel, or, for YouTube Partner Program members, an external site (YouTube Help). Place them where you mention the thing they link to, not at random.

Playlists

A playlist plays the next video automatically, which turns one view into several. Build two kinds:

  • Series playlists in a set order, for content meant to be watched in sequence.
  • Topic playlists grouping your videos on one question, which match the keyword clusters above.

Give each a searchable title and a short description, feature the best ones on your channel page, and link to them from end screens.

Retention: The Part That Happens Inside the Video

No title or thumbnail rescues a video that loses people. Open the retention graph in YouTube Studio for each video and look for:

  • The first 30 seconds. The biggest drop is almost always here. If many viewers leave early, the opening is too slow or does not match the title. Start with the payoff, not an introduction.
  • Sudden drops in the middle. Something there was boring, confusing or off-topic. Cut the equivalent sections from future videos.
  • Rises. People rewinding to watch again. Make more of whatever is there.

Keep a promise running through the video ("the third one is the one most people get wrong"), change visuals often, and cut every sentence that does not move forward.

Reviving Old Videos

Old videos can be improved at any time, and it is often faster than making a new one.

  1. Pick candidates. Videos with plenty of impressions but a low CTR (the packaging is the problem), and videos with good retention but few impressions (the topic might be good but the title does not match searches).
  2. Change one thing at a time, usually the thumbnail first, then the title, and give each change a week or two before judging.
  3. Update the description, add chapters, and fix end screens that point to outdated videos.
  4. Link to them from newer videos with cards and end screens.

The Metrics to Watch

In YouTube Studio, for each video:

Metric What it tells you What to change if it is low
Impressions How often YouTube showed the thumbnail Topic and search terms
Impressions CTR Whether the packaging works Thumbnail, then title
Average percentage viewed Whether the video holds people Opening, pacing, length
Traffic sources Where viewers found it More of what works: search, suggested or browse
Subscribers gained Whether viewers want more Series, end screens, clearer channel focus

Compare a video against your own channel's typical numbers, not against figures from other channels. Averages vary enormously between niches and formats.

Before You Apply for Monetisation

Before applying to the YouTube Partner Program, check that:

  • every public video follows the Community Guidelines and you have no active strikes,
  • the channel does not look mass-produced or repetitive (see the inauthentic content policy),
  • all music, footage and images are licensed and credited,
  • realistic AI-generated content is disclosed where required (see the AI disclosure guide),
  • sponsorships are marked with YouTube's paid promotion setting,
  • the channel name, description, banner and icon say clearly what the channel is about.

The Checklist

Before publishing

  • The question or search the video answers is decided
  • Title: key words in the first 60 characters, specific promise, no misleading claims
  • Thumbnail: one idea, readable at phone size, bottom right clear
  • Description: first two lines explain the video and include the main term
  • Credits for music and footage, affiliate links disclosed
  • Chapters: start at 00:00, at least three, each 10 seconds or longer
  • Captions checked or uploaded
  • End screen pointing to one specific next video
  • Added to a playlist
  • One to three hashtags, a few tags

After publishing

  • After two or three days: check impressions CTR and the retention graph
  • Low CTR with plenty of impressions: test a new thumbnail
  • Early drop in retention: note it for the next script
  • Monthly: pick two older videos to improve

Try the creator to go from script to a video with captions and credits ready to publish.

Related articles

Ready to create your own videos?

Start creating View pricing