One caption. Every platform's verdict.
Write it once, see it judged everywhere: total characters against each platform's ceiling, where the fold truncates, and whether your hashtag count reads as strategy or spam.
Nothing is uploaded — your audio never leaves your device.
Edit the platform limits — saved on this device · defaults last reviewed 2026-07
| Platform | Max characters | Fold (…more) at |
|---|
Captions launch posts. Consistency launches artists.
SongPoster is growing into the full release-visuals machine. The studio already handles the music side: 3 full packs free.
The fold is the real limit — the ceiling is a technicality
Ask what Instagram's caption limit is and you'll hear 2,200 characters. Technically true, practically irrelevant: the number that decides whether your announcement works is roughly 125 — the point where the feed truncates your text behind "…more." Everything below that line is opt-in reading, and almost nobody opts in. The same split exists everywhere: YouTube gives descriptions 5,000 characters but shows a line and a half before "Show more"; TikTok's generous field still folds early in the feed. Writing a caption without knowing the fold is writing a headline without knowing where the page gets cut.
This checker measures your text the way each platform actually counts it, live as you type. That includes the details generic character counters miss: emoji and other non-basic characters counted properly rather than as byte pairs, X/Twitter's rule that every URL costs a flat 23 characters regardless of its real length, and per-platform fold markers that show you the exact preview a scroller sees — so you can check that the hook, the artist name, and the release date all survive the cut. Hashtags are counted separately with a sanity verdict, because the 30-tag wall reads as spam in 2026 and three to five specific tags is the working consensus.
One honest caveat, built into the tool itself: platforms adjust these numbers without holding a press conference. The limits table is editable and dated, and your edits persist on this device — when a platform moves the fence, fix the number once and the verdicts follow. The craft this tool enforces doesn't change: say the important thing first, above every fold you're writing for.
Frequently asked questions
What are the caption limits per platform?
The commonly cited ceilings: Instagram 2,200 characters (folds around 125), TikTok 2,200, X/Twitter 280 for standard accounts, YouTube 5,000 for descriptions (folds early). Platforms adjust these — the checker's table is editable and shows when its numbers were last reviewed.
How many hashtags should a music post use?
Current common wisdom runs 3–5 relevant tags rather than the old 30-tag walls — platforms increasingly read tag-stuffing as spam. The checker counts yours and flags extremes in both directions; your niche's norms win over any rule.
What's the 'fold' and why does it matter?
The point where the platform truncates with a 'more' link. Everything after it is invisible to scrollers — so your hook, the artist name, and the call-to-action belong above it. The checker marks exactly where each platform folds your text.
Does this post anything for me?
No — it measures text, locally. Posting stays in your hands and your accounts.