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

Drop your clip into ReelCaption, let it transcribe the audio, style the captions large and high-contrast so they read at small sizes, then export a captioned MP4 to post.

Why do captions matter on X?

Video autoplays muted in the timeline, so a viewer often decides whether to keep watching from the on-screen text alone. Captions carry your hook before any sound plays.

What size should the video be?

X supports landscape, square, and vertical video. ReelCaption keeps your clip at its original size, so you can export whichever fits your post.

Yes, 5 minutes of captions a month with no card, then $5/mo for Pro.

Captions for · X (Twitter)

Add captions to your X (Twitter) videos

Video autoplays muted in the X timeline, and people scroll fast. On-screen captions are what make someone stop and actually watch. ReelCaption transcribes your clip and burns in captions you can style, all in your browser.

How to add captions to X (Twitter)

1Open ReelCaption and drop in your clip (landscape 16:9, square, or vertical all post fine on X).
2It auto-transcribes the audio into word-perfect captions with per-word timing.
3Fix any wording, fine-tune timing on the timeline, then style it with a bold font and a thick outline so it reads at small in-timeline sizes.
4Keep the captions away from the very bottom where the timeline overlays playback controls, then export a burned-in MP4.
5Post to X. The captions are part of the video, so they show as the clip autoplays muted.

Tips for X (Twitter)

Clips often play small in the timeline, so use large, bold text with a strong outline so it stays legible before someone taps to expand.
X video can be landscape, square, or vertical; ReelCaption preserves whatever size you bring.
Keep captions out of the very bottom strip, where playback controls appear on tap.
Burned-in captions guarantee the hook reads during muted autoplay, which is most of the views on X.

Why ReelCaption

Bold, legible captions that read even when the clip plays small in the timeline.
A timeline editor to retime, split, and trim captions before export.
Focused on captions, with none of the editor extras you would not use.
Free to start with no card; $5/mo for more minutes.
Runs in any browser, nothing to install.

FAQ

How do I add captions to an X (Twitter) video?: Drop your clip into ReelCaption, let it transcribe the audio, style the captions large and high-contrast so they read at small sizes, then export a captioned MP4 to post.
Why do captions matter on X?: Video autoplays muted in the timeline, so a viewer often decides whether to keep watching from the on-screen text alone. Captions carry your hook before any sound plays.
What size should the video be?: X supports landscape, square, and vertical video. ReelCaption keeps your clip at its original size, so you can export whichever fits your post.
Is it free?: Yes, 5 minutes of captions a month with no card, then $5/mo for Pro.

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