How long can an X post be?

280 characters. Counted with X's weighted rules: every URL costs 23 characters whatever its length, and most emoji and CJK characters cost 2. Premium accounts may post up to 25,000 chars; we enforce the 280 floor for everyone.

How many images can one X post have?

Up to 4: .png, .jpg, .jpeg, .webp, up to 5 MB each.

What video does X accept?

1 video per post: .mp4, .mov, up to 512 MB each, up to 2 min 20 s.

How do you tag an account on X?

Write @handle. Plain @handle links natively.

xweighted characterslast verified 2026-07-21

X post limits and media specs

Every number below is the one our publishing engine enforces before an X post goes out, with the source it came from and the date we last read it.

Text^[text]

X text limits
Max length	280 weighted characters
Counting	Counted with X's weighted rules: every URL costs 23 characters whatever its length, and most emoji and CJK characters cost 2.
Account	Premium accounts may post up to 25,000 chars; we enforce the 280 floor for everyone.

Media

X media constraints by kind
Constraint	Images^[image]	Video^[video]
Per post	4	1
Formats	.png, .jpg, .jpeg, .webp	.mp4, .mov
Max size	5 MB	512 MB
Max length	-	2 min 20 s
We publish it	yes	yes

We publish text, images and video here; PDF documents we do not deliver to X yet. One post carries images or a video, never both. A PDF deck degrades here into up to 4 slide images.

Mentions

X mention syntax
Syntax	`@handle`

Plain @handle links natively. When the post references a company, person, or product with an X presence, tag it - a linked mention is free reach. Only handles you KNOW exactly; a guessed handle tags a stranger.

The guidance our own agent carries for X, verbatim.

How our publisher handles it

The notes our publishing engine carries for X, verbatim - what our adapter does, not only what the platform allows.

A URL in the text raises the per-post API cost to $0.20 (vs $0.015).

Questions

How long can an X post be?: 280 characters. Counted with X's weighted rules: every URL costs 23 characters whatever its length, and most emoji and CJK characters cost 2. Premium accounts may post up to 25,000 chars; we enforce the 280 floor for everyone.
How many images can one X post have?: Up to 4: .png, .jpg, .jpeg, .webp, up to 5 MB each.
What video does X accept?: 1 video per post: .mp4, .mov, up to 512 MB each, up to 2 min 20 s.
How do you tag an account on X?: Write @handle. Plain @handle links natively.

Sources, verified 2026-07-21

Each citation names where the number came from. Anything we could not confirm in an official document is marked, because a number nobody will stand behind should look different from one that is.

[text]help.x.com 280/25k premium; t.co=23help.x.comverified 2026-07-14
[image]docs.x.com 4 images OR 1 video; size caps unconfirmeddocs.x.comverified 2026-07-14no official doc confirms this number
[video]docs.x.com chunked upload, tweet_video category, STATUS polldocs.x.comverified 2026-07-21

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