X (formerly Twitter) Publishing

This page contains high-level specifications for scheduling and publishing X (formerly Twitter) posts through Publisher.

If your post does not meet the requirements to publish, Publisher informs you so you can correct the post.

Text

Text properties	Guidelines	More information
Post character limit	`280`	Profiles that have an X Premium subscription can post up to `25,000` characters. If you only recently activated X Premium, it can take up to 24 hours between subscribing for X Premium and being able to schedule a post through Publisher that has more than `280` characters.

Link

This information is valid for when you use the Import preview link option.

Link properties	Guidelines	More information
Maximum number of links	`1`	-

Photo

Photo properties	Guidelines	More information
Allowed extensions	`jpg`, `jpeg`, `png`, `gif`, `tif`, `tiff`	-
Maximum number of files	`4`	-
Maximum file size	`5 MB`	-
Maximum image dimensions	`6,000px x 6,000px`	-
Alt text character limit	`1,000`	-

Animated GIF

Animated GIF properties	Guidelines	More information
Maximum number of files	`1`	-
Maximum file size	`15 MB`	-
Maximum GIF dimensions	`1,280px x 1,080px`	-

Video

Video properties	Guidelines	More information
Allowed extensions	`mp4`, `mov`, `m4v`	-
Maximum number of files	`1`	-
Maximum file size	`512 MB`	-
Minimum and maximum duration	`0.5 to 140 seconds`	-
Minimum dimensions	`32px x 32px`	-
Maximum dimensions	`1,920px x 1,920px`	-
Aspect ratio	`1:3 to 3:1 (0.33 to 3)`	-
FPS (frames per second)	`max 60 FPS`	-
Video codec	H264, progressive scan, 4:2:0 chroma subsampling	-
Audio codec	AAC with low complexity profile, max. 2 audio channels	-
Thumbnail	Allowed extensions: `jpeg, png` Maximum file size: `5 MB`	-

Mixed media

A mixed media post can include up to 4 assets that are a mix of photos, videos, and gifs. Each asset type is restricted by the same guidelines as described elsewhere on this page.

Additional publishing options

Mention any X (formerly Twitter) profiles by using: "@" (there is autocomplete)
Label
Scheduling
Uploading cloud-shared assets directly from cloud storage applications

On Monday, 9 June 2025, the social-media platform X deprecated its v1.1 media-upload endpoints and required users switch to their v2 API. This change removed support for the X ProMediaAPI. To learn more, see X (formerly Twitter) Media Upload v1.1 API Endpoints.

To learn more, see Content Options in Publisher.