# Burn Subtitles into Video - SRT Overlay

Hard-burn an SRT file into MP4 frames privately in your browser

### Video & SRT

Video file

MP4 / WebM / MOV

SRT subtitles

.srt file

Burn Subtitles  Clear

SRT is copied into local browser processing FS · burn-in re-encodes · Max ~100 MB video

### Subtitled Preview

Subtitled video appears here

## What does Burn Subtitles into Video do?

This tool hard-burns an SRT subtitle file into a video so captions are part of the picture. Upload the clip and the SRT; local browser processing’s subtitles filter renders cues onto frames and exports MP4 in your browser.

Burn-in matters when platforms strip soft tracks, when you need captions always visible, or when you share to devices that ignore sidecar files. Social clips, course mirrors, and event recordings often need permanent text.

Privacy stays intact because neither the video nor the transcript leaves the machine. Translators and teachers can caption sensitive lessons without a cloud caption SaaS.

The page is not a full caption editor. Write or fix SRT elsewhere, then burn. That separation keeps the UI honest and the job reliable.

After burn-in, you can compress or trim as needed. Burn late in the pipeline so you do not re-burn after every timing tweak.

Small media chores still burn calendar time when every task means a new desktop project. (note 1). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Working inside a browser memory budget nudges you toward shareable source sizes from the start. (note 2). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Visible status lines prevent the false assumption that a tab froze during a long encode. (note 3). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Resetting the form between exports stops stale previews and wrong filenames from sneaking through. (note 4). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Chaining ToolComb video pages creates a private pipeline without creating yet another SaaS account. (note 5). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Spot-checking on phone and laptop screens reveals soft text and pacing issues early. (note 6). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Naming downloads with clear suffixes makes it easier to find the latest take in a busy folder. (note 7). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Prefer the simplest setting that meets the requirement; extra knobs often invite accidental quality loss. (note 8). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

If a job fails, shrink the source or simplify options before assuming the browser is broken. (note 9). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Document the settings you used when a result looks perfect so the next episode matches. (note 10). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Small media chores still burn calendar time when every task means a new desktop project. (note 11). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Working inside a browser memory budget nudges you toward shareable source sizes from the start. (note 12). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Visible status lines prevent the false assumption that a tab froze during a long encode. (note 13). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Resetting the form between exports stops stale previews and wrong filenames from sneaking through. (note 14). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Chaining ToolComb video pages creates a private pipeline without creating yet another SaaS account. (note 15). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

Spot-checking on phone and laptop screens reveals soft text and pacing issues early. (note 16). When you use burning SRT subtitles into video on ToolComb, stay in a short loop: load media locally, change only the settings that matter, follow the local browser processing status log, preview the output, and download once you are happy. That habit replaces installing a full editor for a single chore and keeps confidential footage off anonymous cloud converters.

## How to burn SRT subtitles into a video

Two uploads and one encode produce hard captions.

1. **Upload video**

Choose the video you want to caption.
2. **Upload SRT**

Add an SRT subtitle file with timings you have checked.
3. **Create captions**

Start the export to place each subtitle cue permanently on the video.
4. **Preview**

Check that cues appear when expected.
5. **Download**

Save the captioned MP4 after checking the preview.

## Example: always-on captions for a course mirror

### Before

An instructor has lesson.mp4 and lesson.srt. The LMS ignores soft subs on mobile.

### After

They burn captions locally and upload a single MP4 students can read without toggling tracks.

A compress pass keeps weekly uploads inside the LMS size cap.

## Ten uses for hard subtitle burn-in

### 1. Social platforms

Keep captions when soft tracks are stripped.

### 2. Course mirrors

Guarantee readable text on every device.

### 3. Silent autoplay

Communicate without sound.

### 4. Translations

Burn a target-language SRT for distribution.

### 5. Accessibility drafts

Ship readable text before soft-sub workflows mature.

### 6. Event recordings

Lock speaker names and titles into the picture.

### 7. Compliance clips

Ensure required disclaimers stay visible.

### 8. GIF alternatives

Prefer captioned MP4 over huge GIFs.

### 9. Client reviews

Force reviewers to see timed notes.

### 10. Archive masters

Store a captioned viewing copy beside soft-sub masters.

## Burn-in versus soft subs and cloud captioning

Soft tracks, burned text, and cloud services solve different problems.

| Consideration | This burn-in tool | Soft SRT/VTT | Cloud caption SaaS |
| --- | --- | --- | --- |
| Toggle off | No | Yes | Depends |
| Upload | None | None | Yes |
| Styling UI | Minimal | Player dependent | Rich |
| Best for | Always-visible private burns | Flexible playback | Teams at scale |

Keep soft subs for editable masters. Burn when distribution demands permanent text.

## Limitations to keep in mind

- SRT only.
- Limited styling.
- Requires libass-capable local browser processing.
- Each upload can be about 100 MB because the job runs in browser memory.
- The first run downloads and compiles the local browser processing engine, so it is slower than later runs.
- Unusual codecs may not be readable by the browser build of local browser processing.
- Very long or very high-resolution clips can be slow or fail on devices with limited RAM, especially phones.
- If you close or reload the tab while processing, the job stops and must be restarted.

## Privacy and good practice

Your files are read by the Burn Subtitles into Video page and written into a temporary in-memory file system used by local browser processing. Processing happens on your device. Media is not uploaded to an encoding server.

The only network fetches are the page itself and, on first use, the generic local browser processing engine files of roughly 25 MB. Those files do not contain your video. Closing the tab discards temporary data.

Downloaded results land in your normal downloads folder. On a shared computer, delete them when finished and empty the recycle bin if the material is sensitive.

## Frequently Asked Questions

### What is burn-in?

Burned-in subtitles become part of the video picture, so viewers cannot turn them off.

### Which subtitle format?

Use an SRT file alongside the video. Check its cue times before exporting.

### Can I style fonts?

This tool focuses on a quick standard caption treatment. Prepare a fully styled video in dedicated editing software when custom fonts or positioning are essential.

### Will soft subs remain?

Output focuses on burned-in text. Do not expect a separate soft track in the MP4.

### Are files uploaded?

No. Your video and subtitle file are processed in the browser.

### Timing off?

Fix timestamps in the SRT, then re-run. The tool does not shift cues.

### Languages and Unicode?

UTF-8 SRT usually works. Exotic fonts may fall back depending on browser support.

### Why re-encode?

Captions must be drawn onto the frames, so exporting can take longer than a simple file copy.

### File size limit?

About 100 MB for the video; SRT files are tiny by comparison.

### Failed burn-in?

Try a simpler UTF-8 SRT file, a shorter clip, or another browser if the export fails.

## Related video tools

- [Video trimmer](https://www.toolcomb.com/video-trimmer) - Cut by start/end time.
- [Video compressor](https://www.toolcomb.com/video-compressor) - Shrink with CRF or bitrate.
- [Video to GIF](https://www.toolcomb.com/video-to-gif) - Export an animated GIF.
- [Video to MP3](https://www.toolcomb.com/video-to-mp3) - Extract soundtrack as MP3.

## Related Tools

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### Related guides

Read the how-to, then come back to this tool when you are ready to run it locally.

- [Burn-In Subtitles from SRT: Limits and Workflow Hardcode captions in the browser with FFmpeg.wasm when sidecar SRT fails on social or review links. Timing, font, ~100 MB caps, and accessibility tradeoffs.](https://www.toolcomb.com/blog/burn-in-subtitles-from-srt-limits)
- [Best Free Browser Audio and Video Tools (FFmpeg.wasm) Trim, join, compress, GIF, MP3, subtitles, and waveform exports without uploading media. How ToolComb's FFmpeg.wasm tools map to real chores - and where ~100 MB and first-load limits apply.](https://www.toolcomb.com/blog/best-free-browser-audio-and-video-tools)

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