How do I add captions to an X (Twitter) video?

Drop your clip into ReelCaption, fix any wrong words, and make the captions large and high-contrast. Then export the MP4 and attach it to your post.

Why do captions matter on X?

Because X starts video muted in the timeline. People read the first caption before they decide to tap for sound.

What size should the video be?

Whatever suits the post. X accepts wide, square and vertical video, and ReelCaption exports at the size you bring.

Yes. Your first 2 clips, up to 60 seconds each, need no account. Sign in with Google for 5 free minutes a month, with no card. Pro is $5 a month for 100 minutes.

Captions for · X (Twitter)

Add captions to X (Twitter) videos

Video on X starts muted in the timeline and often plays small. Large burned-in captions let people read your hook before they tap. ReelCaption transcribes the clip and exports an MP4 with the captions drawn in.

Caption a video free

Step by step

1Drop in your clip. Wide, square and vertical all post on X, and ReelCaption keeps the size.
2Fix any misheard words on the timeline.
3Use a bold font with a thick outline, set larger than usual, because timeline previews are small.
4Keep the bottom strip clear. X shows playback controls there when someone taps the video.
5Export the MP4 and attach it to your post.

Tips for X (Twitter)

Put your hook in the first caption. It is what people read while the clip plays muted.
Split long captions so none covers more than 2 lines at timeline size.
Burned-in captions stay in the video when someone downloads or reposts it.
X also lets you attach an .srt file when you post from the web, but viewers can hide it. Burned-in text always shows.

Why ReelCaption

Bold, outlined presets that stay readable at timeline size.
A timeline editor to split long captions and line up the first one with your hook.
No watermark, and the MP4 keeps your original size.
2 clips free with no account, then 5 free minutes a month when you sign in with Google. No card.

FAQ

How do I add captions to an X (Twitter) video?: Drop your clip into ReelCaption, fix any wrong words, and make the captions large and high-contrast. Then export the MP4 and attach it to your post.
Why do captions matter on X?: Because X starts video muted in the timeline. People read the first caption before they decide to tap for sound.
What size should the video be?: Whatever suits the post. X accepts wide, square and vertical video, and ReelCaption exports at the size you bring.
Is it free?: Yes. Your first 2 clips, up to 60 seconds each, need no account. Sign in with Google for 5 free minutes a month, with no card. Pro is $5 a month for 100 minutes.

Guides for other platforms

Caption your next clip in a couple of minutes.