How to Auto-Generate Captions for Video Using AI

An AI caption generator transcribes spoken audio and turns it into text timed to your video. In Cubix, Auto Captions creates editable captions so you can review the words, adjust the timing and choose how the text appears before publishing.

Start with the speech, then make three decisions: whether the words are correct, whether viewers have time to read them, and whether the caption style suits the footage.

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How to auto-generate captions in Cubix

1. Add your video

Open Cubix and add the recording you want to caption. Talking-head videos, interviews, podcasts, lessons and narrated screen recordings are useful starting points because the spoken message is the material the captions represent.

Finish the main cuts first where practical. After changing the sequence or trimming a section, review the captions against the edited video again.

2. Generate the captions

Run Auto Captions. Cubix transcribes the speech and creates caption blocks with timing information, including word-level timing for supported active-word highlighting.

Automatic transcription gives you a first pass. Background noise, overlapping speech, names and specialist vocabulary can all affect the result, so listen to the recording while reviewing the text.

3. Correct the words and timing

Open the captions panel and review the transcript. Correct names, product terms and any words the transcription misunderstood. You can edit caption text and adjust a caption's start and end time.

Check that each phrase appears with the corresponding speech and stays on screen long enough to read. If a line feels crowded, adjust the caption grouping rather than making the font too small.

4. Choose the caption look

Choose a caption treatment, then adjust the supported font, size, color and placement controls. A restrained interview and a high-energy social clip may need different looks.

Cubix supports Standard, Karaoke and Podcast caption flow options. With supported highlighting enabled, the active word can be emphasized as the speaker talks. Use a treatment that helps the words remain easy to follow.

For more visual options, explore Caption Styles. For practical placement and contrast advice, read how to make video captions easy to read.

5. Review the finished frame

Play the captioned result and check the text against the voice. Preview at a size close to where your audience will watch it.

• Keep captions clear of faces, demonstrations and important on-screen labels.
• Check contrast across bright and dark parts of the footage.
• Keep phrases readable without filling the frame with text.
• When preparing a social video, allow space for the destination's interface and review the uploaded preview.

Captions help viewers follow spoken content without sound.

Choose a captioned video or an SRT file

Cubix supports two different outputs:

A video with captions burned in. Export the video when you want your chosen fonts, colors and caption treatment visible in the finished picture. Those captions are part of the video image.

A separate SRT file. In the captions panel, use Download SRT to save the caption text and timing. SRT does not include Cubix's fonts, animations, colors or active-word highlighting. How a separate subtitle file is displayed depends on the player or platform that loads it.

You can also upload an existing SRT file through the captions menu and apply it to your media. That is useful when a reviewed subtitle file already exists.

Creator supports video exports up to 1080p; Pro supports up to 4K. These are video resolution limits, separate from downloading caption text as SRT. See current plans when choosing an export resolution.

Common caption mistakes

Publishing the first transcript without checking it. Review names, numbers and technical terms against the recording.

Choosing the look before checking readability. Watch the text over the actual footage. An outline, shadow or background treatment may help when the picture is busy.

Expecting an SRT file to preserve the visual style. Use a captioned video export for the designed appearance, or a separate SRT when the destination needs text and timing.

Changing the edit without reviewing the captions. Recheck timing after trims, rearrangements or changes to the spoken audio.

Questions about AI video captions

Can I fix a mistake without regenerating everything?

Yes. Caption text remains editable in Cubix. Correct the affected words, then play that section to check the result.

Can I adjust when a caption appears?

Yes. The captions panel supports start and end time edits. Review the adjusted caption with the corresponding speech before exporting.

Can I make word-highlighted or karaoke-style captions?

Yes. Cubix has supported caption flow and highlighting controls that can emphasize the active word. The appearance depends on the selected treatment and settings.

Can I download captions separately from the video?

Yes. Use Download SRT for a separate text-and-timing file. Export the captioned video when you want the visual treatment included.

Will captions fix a noisy recording?

Captioning transcribes speech; it does not remove noise from the source. Review difficult sections carefully. If you also need audio cleanup, see Clean Audio.

Can I use captions on Reels, Shorts or YouTube videos?

Yes. You can prepare captioned creator videos for those destinations. Check framing, text placement and the final preview for the format you will publish. See Shorts & Reels editing for the wider workflow.

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Related caption questions

For CapCut-specific help, check missing auto captions, incorrect words or importing an existing SRT. For caption delivery from another editor, see Premiere export settings or Resolve subtitle export. If a subtitle file already exists, use the offset-versus-drift checklist before changing its times.