Instagram Character Counter for Captions

Every limit, and where it comes from

These are the numbers the counter checks. Each comes from the platform’s own pages, read on 25 October 2026, and the last column says what the source covers.

Two numbers need a caveat. Meta’s developer reference still lists 30 hashtags for captions posted through its API. Instagram’s official @creators account said on 18 December 2025 that Instagram “will allow up to 5 hashtags in a reel or post”, so the counter checks against five.

TikTok is the other. TikTok’s site does not load from our network in India, so we read TikTok’s developer reference from an Internet Archive copy saved on 13 August 2026. It allows 2,200 UTF-16 units in a caption posted through the API. We found no page we could open that states the limit inside the TikTok app, so the TikTok card says to check in the app.

How to write a caption that fits

These steps are our advice, built on the limits above.

1. Lead with the point. No app publishes how much of a caption shows before “more”, and the cut moves with screen size. Make the first line work on its own. If it is also your first spoken line, the hook library has more than 120 openings to start from.
2. Use a few hashtags that describe the video. Instagram now allows five. YouTube Help warns that “the more tags you add, the less relevant they become” for people searching, and it ignores every hashtag on a video with more than 60.
3. Write one caption for the strictest app. When you cross-post, write to the smallest numbers in the table: five hashtags, 20 mentions and 2,200 UTF-16 units. The counter flags the rest, such as a long caption in Hindi going past YouTube’s byte limit. The YouTube title is separate and stays within 100 characters.
4. Leave room for emoji. Some apps count each part of an emoji, so one can use two or more characters. Near a limit, trim a few characters rather than trust the exact count.
5. Break lines where they help reading. Each line break counts as a character, so a caption of many short lines uses a limit up a little faster.

For what Instagram itself says about how reels get recommended, read our guide on how to go viral on Instagram Reels.

How this counter counts

• Characters are grapheme clusters, what you see as one character, counted with your browser’s built-in text segmenter. A browser without one counts Unicode code points instead, and the tool says so under the counts.
• TikTok characters are UTF-16 units, the unit TikTok’s API states. Most letters take one unit and most emoji take two or more.
• YouTube bytes are the caption’s size in UTF-8, the unit YouTube’s developer reference uses for descriptions.
• Hashtags are a # followed by letters, numbers or underscores in any script, such as #東京 or #हिंदी. A # inside a word, as in C#, or followed only by digits, as in #1, does not count. Those two rules are ours, and apps may differ at the edges.
• Mentions are an @ followed by letters, numbers, dots or underscores. Email addresses are skipped.
• Emojis are characters shown as emoji, including flags and keycaps such as 1️⃣. Symbols such as © count only in their emoji form.
• Words are runs of letters and numbers in any script. Words joined by an apostrophe or hyphen count once.

None of the three platforms publishes exactly how its app counts. A result within a few characters of a limit is a reason to check in the app before you post.

Post captions and captions on the video

This tool checks the text under your post. The words on the video itself are also called captions, and they follow different rules: few words at a time, timed to your voice and clear of the app’s buttons.

Our guide to adding captions to Instagram Reels covers Instagram’s own caption options. Video captions people can actually read covers line length and timing, and the safe zone checker shows where each app’s buttons sit.