X's developer docs set post images at 5 MB or less and animated GIFs at 15 MB. Standard accounts can post videos up to 20 minutes and 8 GB; X Premium raises that to 125 minutes and 16 GB. Ad card images must be at least 800 px wide and 3 MB or less.
| Placement | Size | Aspect ratio | Max file size | Copy or link |
|---|---|---|---|---|
| Post image | Not published | Not published | 5 MB | |
| Post video (standard account) | up to 20 minutes | Not published | 8 GB | |
| Post video (X Premium or verified) | up to 125 minutes | Not published | 16 GB | |
| Ad card image (website card) | min 800 px wide | 1.91:1 | 3 MB |
Every row links to the full spec below, with its source. "Not published" means X (Twitter) doesn't state it, so we don't either. Download all 7 specs as CSV.
X publishes a file-size limit for post images but no recommended pixel size in its developer docs.
Source: X Developer Platform, Media upload: size and duration limits. Checked 2 October 2026.
Source: X Developer Platform, Media upload: size and duration limits. Checked 2 October 2026.
up to 20 minutes
Source: X Developer Platform, Media upload: size and duration limits. Checked 2 October 2026.
up to 125 minutes
Source: X Developer Platform, Media upload: size and duration limits. Checked 2 October 2026.
min 800 px wide
Website cards also accept 1:1 images.
Source: X Developer Platform, Ads API: Creatives. Checked 2 October 2026.
Video website cards also accept 1:1.
Source: X Developer Platform, Ads API: Creatives. Checked 2 October 2026.
up to 10 minutes
Source: X Developer Platform, Ads API: Creatives. Checked 2 October 2026.
This page was first checked on 2 October 2026. When X (Twitter) changes a spec, the old one is kept here with the date.
X's developer docs allow post images up to 5 MB, in JPG, PNG, GIF or WEBP. Animated GIFs can be up to 15 MB.
Standard accounts can upload videos up to 20 minutes and 8 GB. With X Premium or a verified account, the limit is 125 minutes and 16 GB. The minimum is 0.5 seconds.
For website card ads, images must be at least 800 px wide and 3 MB or less, in a 1.91:1 or 1:1 ratio.
Video website cards support 16:9 and 1:1.
Through the Ads API, promoted videos can be up to 10 minutes long and 500 MB, as MP4 or MOV.
X lists those on its help centre, which could not be checked for this page. Rather than repeat numbers we could not confirm, we leave them out. The upload limit for any image is 5 MB.