How to Add Captions to a Video

Accurate captions make spoken information available when a viewer cannot hear the audio, has audio turned off, or benefits from reading along. W3C's audio and video accessibility guidance explains that captions include speech and important non-speech audio needed to understand the content.

The workflow is more than pressing “auto-caption.” Generation creates a draft; correction, timing, segmentation, readability, and final playback review make that draft useful.

Captions, subtitles, transcripts, and text overlays

These terms are related but not interchangeable:

• Captions represent dialogue or narration and relevant non-speech audio, such as [applause], for people who may not hear the soundtrack.
• Subtitles often translate speech or transcribe it for a viewer assumed to hear other audio cues, although products and regions use the terms differently.
• A transcript is a written record of the audio, usually without time-coded display behavior.
• Text overlays add labels, hooks, or emphasis but do not necessarily reproduce the audio.

Do not call a few animated keywords “captions” if they omit most of the spoken meaning.

Open captions vs. closed captions

PowerCut's styled short-form captions are open captions in the exported MP4. You can adjust their appearance before rendering. If a destination needs a selectable caption track, follow that platform's upload workflow. YouTube, for example, documents manual entry, auto-sync, and file upload and lists supported caption formats, including basic SRT files.

1. Choose open or closed captions

Choose based on distribution:

• Use open captions when consistent, branded mobile presentation matters and the clip will travel through feeds that may not preserve a separate track.
• Use closed captions when the destination reliably supports them and viewer control, accessibility features, or multilingual tracks are priorities.
• Use both only when you understand how duplicate text will behave. A burned-in caption plus an enabled platform track can create an unreadable double display.

For a PowerCut short, the path is open captions: edit the words and style, save, then render them into the MP4.

2. Create a transcript

Automatic speech recognition can create a fast first draft. Clean source audio helps: reduce background music, microphone bleed, and overlapping speech where possible.

PowerCut transcribes spoken video as part of the clip workflow and exposes the Storyline in the editor. The transcript also supports clip-range work and other features, so a text correction should reflect what was actually said rather than rewriting the speaker's meaning.

If the video has meaningful non-speech audio, note it. W3C's media accessibility requirements describe captions as including important sounds as well as dialogue and narration.

3. Correct the caption text

Listen with the text in front of you. Review:

• people, company, and product names;
• acronyms and specialised terminology;
• numbers, currencies, dates, and percentages;
• negative words such as “not,” where one error reverses the claim;
• speaker changes;
• punctuation that changes meaning; and
• meaningful sound descriptions.

YouTube's automatic caption guidance explicitly warns that automatic captions can vary because of accents, dialects, pronunciation, or background noise and advises creators to review and edit them.

Do not “clean up” a quotation into words the speaker did not say. If a false start is removed from the audio through an approved cut, update the visible captions to match the exported speech.

4. Sync and segment the captions

Captions should appear with the corresponding speech and leave when that unit finishes. Large timing gaps make viewers read ahead or search for the line they just heard.

Segment by meaning, not by arbitrary character count:

• keep a short phrase together;
• avoid separating an article or preposition from its phrase;
• do not leave one short word on a new line when a better break is available;
• keep speaker changes distinct; and
• give a viewer enough time to read without displaying the next idea early.

Preview fast sections at normal speed. A style that works for measured narration may become unreadable during an excited exchange.

5. Style for readability

In PowerCut, choose a preset and adjust typography, size, colours, outline, and position. You can emphasise selected words or use suggested emphasis, and use speaker colours where speakers have been detected.

Apply these checks:

1. Contrast: Text remains readable over both light and dark frames.
2. Size: The line is readable on a phone at normal viewing distance.
3. Position: Captions do not cover a face, product step, chart value, or essential label.
4. Safe area: Text remains clear of player controls and platform interface overlays.
5. Emphasis: Colour or scale highlights a few meaningful words rather than turning every word into visual noise.
6. Speaker colour: Colour supports identification and still passes a contrast check; it is not the only cue when accessibility requires another distinction.

Check the whole video. A white caption with a black outline may work until a bright lower-third, subtitle, or screen recording appears beneath it.

6. Export and review

Save the edit before exporting from PowerCut. Only saved changes are included. Run the export check, download the MP4, and inspect the rendered file because editor caption and transition previews can be approximate.

Review with:

• sound on, to check word and timing accuracy;
• sound off, to check whether necessary meaning survives;
• a phone-sized display, to check type and wrapping;
• the destination composer, to check interface overlap; and
• a second reviewer for names, claims, or accessibility-critical content.

If you are uploading a separate caption file, play it in the destination platform after processing. Frame rates, edits, or transcodes can expose timing drift.

How to add captions in PowerCut

For a generated clip:

1. Open the clip and correct the transcript.
2. Open Captions and choose a preset.
3. Adjust text style, size, colour, outline, and placement.
4. Select specific words for emphasis or review suggested emphasis.
5. Configure speaker colours if the clip has detected speakers.
6. Scrub the entire clip to check every background and layout section.
7. Save, export, and inspect the MP4.

PowerCut currently focuses on burned-in captions for the clip. It is not described here as a full closed-caption authoring system or an SRT/VTT exporter.

Caption quality checklist

Before publishing, confirm:

• every word matches the final audio;
• names and figures were checked against a reliable source;
• important non-speech audio is represented when needed;
• speaker changes are clear;
• timing follows the spoken phrase;
• line breaks preserve meaning;
• contrast and size remain readable throughout;
• text avoids faces, evidence, and interface controls; and
• the actual export—not only the editor preview—was reviewed.

For platform-specific placement, read How to Add Captions to Instagram Reels. For a full editing workflow, see How to Use an AI Video Editor.