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YouTube title character limit and TikTok caption limit

YouTube and TikTok character limits: title and description

A YouTube video title accepts at most 100 characters, according to the YouTube Data API documentation. The description has a different unit: 5,000 bytes, not characters, which matters for anyone writing in Portuguese. The counter opens with a sample title and shows both characters and UTF-8 bytes.

Characters in the title, bytes in the description

The documentation for the "videos" resource of the YouTube Data API (developers.google.com/youtube/v3/docs/videos, read on November 2, 2026) defines two limits: snippet.title with "a maximum length of 100 characters" and snippet.description with "a maximum length of 5000 bytes". Both accept valid UTF-8, except the < and > signs, which are not allowed. Since the description is measured in bytes, an accented letter weighs 2 and an emoji weighs 4: 2,500 "á" letters already fill 5,000 bytes, and 2,501 "ç" go to 5,002. An ASCII-only text uses 1 byte per character and goes up to 5,000 letters.
The sample title in English, "How to calculate percentages in your head: 5 shortcuts that work", has 64 characters and 64 UTF-8 bytes, well under 100. To get close to the limit, what matters is the character count, whereas in long descriptions with many accents, links and hashtags the byte is what counts. These limits are the API's; YouTube Studio may display its own warnings, so use the tool as a safety margin and confirm when uploading. The counter's UTF-8 bytes field shows your text's total in the same unit.
For TikTok, the number I could confirm in an official source is the Content Posting API's: the title field of a direct post has a maximum length of 2,200 "UTF-16 runes", that is, UTF-16 units, the same basis the tool uses. That is the limit for those who publish through the API or schedulers. The caption limit inside the app may be higher and I could not confirm it on an official page, so the tool shows it only as a 2,200 reference. In both cases, hashtags and mentions are part of the text and count toward the total.

Counts checked

Portuguese sample title

Input: Como calcular porcentagem de cabeça: 5 atalhos que funcionam
Expected output: 60 caracteres, 61 bytes

Under the 100 title limit.

2,500 letters á

Input: á × 2500
Expected output: 2.500 caracteres, 5.000 bytes

Fills the description, which is measured in bytes.

2,501 letters ç

Input: ç × 2501
Expected output: 5.002 bytes

Goes over the description limit by 2 bytes.

5,000 ASCII letters

Input: a × 5000
Expected output: 5.000 caracteres, 5.000 bytes

ASCII uses 1 byte per character.

Emoji in the description

Input: 😀
Expected output: 1 caractere, 4 bytes, 2 unidades UTF-16

Weighs 4 bytes in the YouTube description.

Full tool FAQ

Does this tool count characters, words and reading time at once?

Yes. The tool gathers the most-used digital-writing metrics in a single panel, characters with and without spaces, words, unique words, lines, paragraphs, sentences and code points, plus estimates of reading and speaking time. That way you compare length, structure and pace of the text without switching between several tools, and everything updates with each keystroke you type.

Do spaces count as characters?

What counts as a character in a text?

Are characters and words the same thing?

How do you estimate reading time for a text?

How many characters usually fit in a bio, title or description?

Why do different platforms show different counts for the same text?

Is a longer text always better for readability?

Frequently asked questions

What is the YouTube title character limit?

100 characters, according to the YouTube Data API documentation. The < and > signs are not allowed in the title or the description.

Is the YouTube description limited in characters or bytes?

In bytes: 5,000. Accented letters use 2 bytes and emoji 4, so a Portuguese description holds fewer than 5,000 letters. The counter shows the UTF-8 bytes.

What is the TikTok caption limit?

In the Content Posting API it is 2,200 UTF-16 units. The in-app limit is not confirmed in any official source I could open, so check when posting.

Next steps

Characters in the title, bytes in the description

The documentation for the "videos" resource of the YouTube Data API (developers.google.com/youtube/v3/docs/videos, read on November 2, 2026) defines two limits: snippet.title with "a maximum length of 100 characters" and snippet.description with "a maximum length of 5000 bytes". Both accept valid UTF-8, except the < and > signs, which are not allowed. Since the description is measured in bytes, an accented letter weighs 2 and an emoji weighs 4: 2,500 "á" letters already fill 5,000 bytes, and 2,501 "ç" go to 5,002. An ASCII-only text uses 1 byte per character and goes up to 5,000 letters.

The sample title in English, "How to calculate percentages in your head: 5 shortcuts that work", has 64 characters and 64 UTF-8 bytes, well under 100. To get close to the limit, what matters is the character count, whereas in long descriptions with many accents, links and hashtags the byte is what counts. These limits are the API's; YouTube Studio may display its own warnings, so use the tool as a safety margin and confirm when uploading. The counter's UTF-8 bytes field shows your text's total in the same unit.

For TikTok, the number I could confirm in an official source is the Content Posting API's: the title field of a direct post has a maximum length of 2,200 "UTF-16 runes", that is, UTF-16 units, the same basis the tool uses. That is the limit for those who publish through the API or schedulers. The caption limit inside the app may be higher and I could not confirm it on an official page, so the tool shows it only as a 2,200 reference. In both cases, hashtags and mentions are part of the text and count toward the total.

Counts checked

Portuguese sample title

Input: Como calcular porcentagem de cabeça: 5 atalhos que funcionam
Expected output: 60 caracteres, 61 bytes

Under the 100 title limit.

2,500 letters á

Input: á × 2500
Expected output: 2.500 caracteres, 5.000 bytes

Fills the description, which is measured in bytes.

2,501 letters ç

Input: ç × 2501
Expected output: 5.002 bytes

Goes over the description limit by 2 bytes.

5,000 ASCII letters

Input: a × 5000
Expected output: 5.000 caracteres, 5.000 bytes

ASCII uses 1 byte per character.

Emoji in the description

Input: 😀
Expected output: 1 caractere, 4 bytes, 2 unidades UTF-16

Weighs 4 bytes in the YouTube description.

Full tool FAQ

Does this tool count characters, words and reading time at once?

Do spaces count as characters?

What counts as a character in a text?

Are characters and words the same thing?

How do you estimate reading time for a text?

How many characters usually fit in a bio, title or description?

Why do different platforms show different counts for the same text?

Is a longer text always better for readability?

Frequently asked questions

What is the YouTube title character limit?

100 characters, according to the YouTube Data API documentation. The < and > signs are not allowed in the title or the description.

Is the YouTube description limited in characters or bytes?

In bytes: 5,000. Accented letters use 2 bytes and emoji 4, so a Portuguese description holds fewer than 5,000 letters. The counter shows the UTF-8 bytes.

What is the TikTok caption limit?

In the Content Posting API it is 2,200 UTF-16 units. The in-app limit is not confirmed in any official source I could open, so check when posting.