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Caption Styler

Burn SRT or VTT captions into a video locally, or generate them from English speech, with style presets, one to five words at a time, a caption editor, and font, colour, outline, box, and position.

Know your workflow

Supported files and how to use.

Check supported input/output details and follow the tool steps before exporting.

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Technical specs and decision signals

Use these specs to confirm browser fit, privacy boundaries, and export behavior before you burn in captions.

Cost

Free, with no signup.

Security

Decoding and encoding run in your browser; the video and captions are not uploaded to ToolBuddy.

Input

MP4, MOV, WebM, or MKV video up to 2 GB on desktop and 250 MB on mobile, and an SRT or VTT file up to 2 MB.

Captions

Your SRT or VTT file, or generated on your device from English speech (videos up to 30 minutes).

Output

The video's own container where possible, same size and frame rate, picture re-encoded, sound copied.

Style

Presets, font, size, colour, outline, shadow or glow, background box with opacity, all capitals, bold, italic, one to five words at a time, bottom, middle, or top.

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How to use

Check supported input/output details and follow the tool steps before exporting.

01

Select or drop an MP4, MOV, WebM, or MKV video.

02

Choose an SRT or VTT caption file, or generate captions from the speech.

03

Pick a style preset, then adjust the font, size, colour, outline, box, and position while the preview plays.

04

Edit any caption's text or timing, or shift them all if they run out of sync.

05

Burn in the captions and download the video.

Guide

Learn, decide, and apply.

Understand how to burn captions into video in the browser, why it matters in repeat workflows, and when to use this tool with confidence.

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Private, readable captions

  • Runs on your device, so private videos are never uploaded.
  • Generate captions from English speech on your device, or bring your own file.
  • Reads imperfect files: bad cues are skipped and listed by line.
  • The preview shows exactly what the export draws.
  • The sound is copied unchanged.
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Captions for social posts and muted playback

  • Post clips with captions to platforms that do not show subtitle files.
  • Add readable captions to muted autoplay videos.
  • Style the captions made by the Auto Subtitle Generator.
  • Keep captions consistent across a series of videos.
About

About Caption Styler

Burn captions into video in the browserPrivate, readable captionsCaptions for social posts and muted playback

Bring your captions

Choose an SRT or VTT file, such as one from the Auto Subtitle Generator, or generate captions from the video's English speech with an on-device model that is downloaded once. Cues the tool cannot read are skipped and listed with their line numbers, so one typo does not stop the rest.

Every caption is listed in an editor where you can change its text and times, add or remove captions, shift them all by up to 10 seconds, and download the edited SRT or VTT.

Style that reads

Start from a preset such as Classic, Bold pop, Box, Minimal, Neon, or Headline, then choose a font, size, colour, an outline, a shadow or glow, and a box behind each line with its own colour and opacity, placed at the bottom, middle, or top.

Captions can show one to five words at a time with a pop-in animation. Long lines wrap to fit the frame, and the preview draws the captions with the same renderer as the export while the video plays.

Local processing

Every frame is decoded, drawn, and encoded on your device, one at a time, so nothing is uploaded.

The picture is re-encoded because every frame changes; the sound is copied as it is.

FAQ

Common questions.

Have more questions? Reach out via our contact page and we will respond within 24 hours.

Is my video uploaded?

No. The video and the caption file are read, drawn, and encoded in your browser, and nothing leaves your device.

Which caption files work?

SRT and WebVTT (.srt and .vtt), including the files the Auto Subtitle Generator exports. Styling inside the file (tags, VTT cue settings) is ignored; the style you choose here applies to every line.

What if my caption file has errors?

Each cue that cannot be read is skipped and listed with its line number and the reason, and every other cue is still used.

Can viewers turn these captions off?

No. Burned-in captions are part of the picture, which is what platforms without caption support need. Keep your SRT or VTT file for players that show soft subtitles.

Why is the video re-encoded?

Every frame is redrawn with the caption on it, so the picture is encoded again. The sound is copied unchanged.

Do long lines wrap?

Yes. Lines wrap at 90% of the frame width, and text without spaces, such as Chinese or Japanese, wraps too.

Use cases

Popular workflows.

See real workflows where this tool fits naturally, then jump straight into the matching guide.

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Video Trimmer

Continue from Caption Styler into video trimmer for the next step in the workflow.

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Social Video Resizer

Continue from Caption Styler into social video resizer for the next step in the workflow.

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Video Compressor

Continue from Caption Styler into video compressor for the next step in the workflow.

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Guides

Learn with practical workflow guides.

Read intent-focused guides, then jump straight into the live tool workflow.

View all guides

Caption Styler use cases

Practical workflows and common jobs you can handle with Caption Styler.

Open guide

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