Tweet limit
Also known as: Character limit, 280 character limit, X character limit
The character cap on a single post — 280 for free accounts, up to 25,000 for X Premium subscribers (as of 2026).
In depth
X's original tweet limit was 140 characters. Twitter raised it to 280 in 2017, then X Premium launched longer posts (up to 4,000 chars) in 2023 and 25,000 in 2024-2025 for paid tiers.
Free accounts in 2026 are still capped at 280 chars per post. To post longer content as a free account, you split into a thread — a series of connected 280-char posts. AutoTweet auto-splits long content at sentence boundaries with "(1/N)" thread numbering.
Daily posting limits (separate from per-tweet character limits) cap how many posts you can publish in 24 hours: ~2,400 for verified accounts, lower for new/free accounts. The X API has its own per-app rate limits that affect third-party tools.
Example
A tweet at exactly 280 characters fits perfectly; one at 281 chars gets auto-rejected. AutoTweet's editor counts characters in real-time and auto-threads longer content.
Related terms
Thread
A series of connected tweets posted by the same author, displayed as a continuous narrative.
Long-form post
A single tweet exceeding 280 characters, available to X Premium subscribers up to 4,000 characters.
X Premium
The paid subscription tier that unlocks verification, longer posts, reduced ads, and creator monetization eligibility.
Tweet
A post on X (formerly Twitter), originally capped at 280 characters and now extending to 4,000 for X Premium subscribers.
Now put it to work
AutoTweet generates and schedules X content tuned for the algorithm — the same one this glossary just explained.