YouTube Description Character Limit: 5,000 Characters Explained
The YouTube description character limit is 5,000 characters, and the description cannot include invalid characters. The video title has a separate limit of 100 characters. Only the first few lines show before viewers click Show more on desktop or more on mobile, so put the key information there.
Checked October 2026. Sources are listed at the end of the page.
A YouTube description has two jobs. It tells viewers and YouTube search what the video is about, and it holds the extras: links, credits, chapters and channel information. YouTube gives you a lot of room for this, but only the top of the description is visible before a viewer expands it. This guide covers the official limits from YouTube Help, how the visible part differs from the full text, and a simple way to write a description that fits.
| Field | Official limit or rule | What it means for you |
|---|---|---|
| Video description | 5,000 characters, no invalid characters | Everything you write, including links, timestamps and line breaks, has to fit in this space. |
| Video title | 100 characters, no invalid characters | The title is a separate field with its own, much shorter limit. |
| Visible part of the description | What viewers see before clicking Show more on desktop or more on mobile | YouTube does not publish a character number here, so treat the first few lines as your summary. |
| Formatting | Text only, with bold, italic or strikethrough | You cannot add images, but you can format text and use bullet lines. |
| Chapters | First timestamp starts with 00:00, at least three timestamps in ascending order, each chapter at least 10 seconds | Chapter lines live inside the description and count toward the 5,000 characters. |
YouTube Description Character Limit: 5,000 Characters Explained
Write the first few lines as a summary
Viewers see only the top of the description before they click Show more on desktop or more on mobile. Use those lines to say what the video is about and why to watch it. YouTube suggests picking 1-2 main words that describe the video and using them in both the description and the title.
Add the detail below the fold
After the summary, add links, product details, credits and a call to action. The full description can hold up to 5,000 characters, so there is room for useful detail, but every line should help a viewer, not pad the text.
Add chapters if the video is long
To add your own chapters, list timestamps and titles in the description. The first timestamp must start with 00:00, you need at least three timestamps in ascending order, and each chapter must be at least 10 seconds long.
Set a default description for channel basics
In YouTube Studio you can create a default description that fills in basic channel information in all of your videos on upload. Keep it short, because it shares the same 5,000 characters as the text you write for each video.
Count characters before you publish
Paste the title and description into the free YouTube Title Character Counter on Infinall to check them against the 100 and 5,000 character limits. If you need the text written first, Infinall AI can draft copy from your saved brand in Infinall Chat, and the Free plan includes 1,000 credits every month with no card.
How long can a YouTube description be?
YouTube Help states that video descriptions have a character limit of 5,000 characters and cannot include invalid characters. That is the hard cap for the description field when you upload a video in YouTube Studio. The title is a different field with a limit of 100 characters. Spaces, line breaks, links, emoji and chapter timestamps all sit inside the description text, so count the whole thing, not just the sentences.
The part viewers see first
YouTube describes a description as two parts: what viewers see before clicking Show more on desktop or more on mobile, and what they see after. YouTube does not give a fixed character count for the first part, and how much shows depends on the screen. The safe approach is to treat the first few lines as a summary that still makes sense if nothing else is read. Put the topic of the video and your main keyword there, and move long link lists and credits lower down.
What to put in a 5,000 character description
A good structure is: a short summary at the top, then a few lines that expand on the topic, then chapters, then links and credits, then standard channel information. YouTube suggests using the description for chapters, links to playlists of related videos and credits for collaborators. The description field shows text only, but you can bold, italicize or strikethrough text, and you can start a line with a hyphen and a space to make a bullet list. You do not need to use all 5,000 characters. A shorter description that covers the video clearly is better than one filled to the limit.
Title and description limits side by side
People often search for the YouTube title and description character limit together, because both fields are filled in on the same Details screen. The title holds 100 characters and the description holds 5,000. Write the title first, using the same main words you plan to put at the top of the description, then write the description to support it. If you reuse details from a previous upload, check that the copied description still fits the new video.
Where Infinall AI fits, and where it does not
Infinall AI can help you write the copy: you can ask Infinall Chat for a video summary, a list of chapter titles or a call to action in your saved brand voice, then paste the result into YouTube Studio. The free counter checks the length. YouTube Studio itself is still where you add chapters, set the default description and publish the video, and YouTube's own preview is the best check of how the first lines look on desktop and mobile.
Frequently asked questions
What is the YouTube description character limit?
YouTube video descriptions have a character limit of 5,000 characters and cannot include invalid characters, according to YouTube Help.
What is the YouTube title character limit?
Video titles have a character limit of 100 characters and cannot include invalid characters. It is a separate field from the description.
How many characters show before Show more?
YouTube does not publish a number. It says viewers see the first part of the description before clicking Show more on desktop or more on mobile, so put the most important information in the first few lines.
Do chapter timestamps count toward the limit?
Yes. Chapters are added as a list of timestamps and titles inside the description, so they use part of the 5,000 characters. The first timestamp must start with 00:00 and you need at least three in ascending order.
Can I format text in a YouTube description?
The description shows text only, but you can bold, italicize or strikethrough text, and start lines with a hyphen and a space to make bullets.
Sources and checks
Every price, rating and number on this page comes from the source pages below, checked October 2026. Prices and plans change often, so confirm on the vendor's own page before you buy.
- YouTube Help: Upload YouTube videos (title and description limits), checked October 2026
- YouTube Help: Tips for video descriptions, checked October 2026
- YouTube Help: Video chapters, checked October 2026