Post OnceCharacter counter for every platform
Paste a caption once and see if it fits X, Threads, Instagram, TikTok, LinkedIn, Facebook and YouTube, including the five hashtag cap Instagram now enforces.
- X Post0 / 280
- Threads Post0 / 500
- Instagram Caption0 / 2,200
- Instagram Hashtags0 / 5
- TikTok Caption0 / 4,000
- LinkedIn Post0 / 3,000
- Facebook Post0 / 63,206
- YouTube Title (first line)0 / 100
- YouTube Description0 / 5,000
Write it once. Post it everywhere.
Keep posting on your own account as usual. Post Once reposts each new post with its caption to your other accounts, and each account can drop the hashtags or have the caption rewritten to suit it.
- No credit card required
Used by creators with 350K+ followers combined
Common questions
What is the character limit on X (Twitter)?
A post on X can be up to 280 characters. X Premium subscribers can post up to 25,000. X weighs characters: every link counts as 23 whatever its length, and emoji and Chinese, Japanese or Korean characters count as two each, so the X count can differ from the plain character count.
How many hashtags can you use on Instagram?
Five per post. Instagram cut the limit from 30 to five, and hashtags in the first comment count too. The caption itself can run to 2,200 characters.
What is the Threads character limit?
A Threads post can be up to 500 characters, with spaces, line breaks and emoji included.
How long can a LinkedIn post be?
Up to 3,000 characters. LinkedIn folds longer posts behind "see more" after the first few lines, so put the point up top. The LinkedIn text formatter previews where that fold falls.
What is the TikTok caption limit?
TikTok captions can be up to 4,000 characters, hashtags included.
How long can a YouTube title and description be?
A title can be up to 100 characters and a description up to 5,000. Tags share a separate 500 character cap; the YouTube tag generator keeps you under it. This counter treats the first line of your text as the title, which is how Post Once titles a video it reposts to YouTube.
How long can a Facebook post be?
A Facebook post can be up to 63,206 characters.
What happens when one caption is too long for another platform?
Text posts from X, Threads and Facebook Pages are reposted to X, Threads, LinkedIn and Facebook Pages. A text post too long for a destination is skipped there, never cut off. Each post goes out with its caption as written, unless you change that per account: remove comment, DM and link in bio prompts, remove hashtags and mentions, have AI rewrite the caption to suit that app, or add your own text at the start or end.
Is my text saved or sent anywhere?
No. The counter runs in your browser and nothing you type leaves the page.