Burn-in vs soft subtitles: which should you use?
When you finish a video and need to deliver it with subtitles, you face a choice: bake the subtitles into the video (burn-in / hardcoded) or deliver them as a separate stream (soft subtitles). Each approach has real tradeoffs, and the right answer depends on your distribution channel.
What "burn-in" means
Burning in subtitles means rendering the text on top of every frame of the video, so it becomes part of the picture. Once burned in, subtitles cannot be turned off. They survive any re-encode. They appear on every player that can play the video.
Common software for burning in subtitles: FFmpeg (-vf subtitles=file.srt), Handbrake, Adobe Premiere, DaVinci Resolve.
What "soft subtitles" means
Soft subtitles are delivered as a separate stream — either embedded in the container (e.g. MKV with an internal SRT track, or MP4 with a WebVTT track) or as a separate file sitting next to the video (e.g. movie.mp4 + movie.srt). The viewer's player can turn them on or off.
SRT, WebVTT, ASS and similar formats are designed for soft subtitle workflows.
Tradeoffs
| Consideration | Burn-in | Soft subtitles |
|---|---|---|
| Can be turned off | No | Yes |
| Preserved through re-encode | Yes | No (can be lost) |
| Searchable/selectable text | No | Yes |
| Editable after delivery | No | Yes |
| Accessibility (screen readers) | No | Yes |
| Works in social media uploads | Yes | Platform-dependent |
| Smaller file size | No (subtitles increase bitrate slightly) | Yes |
When to burn in
- Social media (TikTok, Instagram Reels, YouTube Shorts, Twitter/X) — many platforms mute videos by default; burned-in subtitles work without requiring viewer action.
- Cinema screening copies — subtitle files are sometimes unreliable in theatrical playback; burned-in subtitles are guaranteed.
- Platforms that ignore embedded subtitle tracks — some video hosts strip or fail to display soft subtitles.
- Promotional clips — short marketing videos benefit from always-visible text.
- Archival copies — burned-in subtitles survive format migration.
When to use soft subtitles
- Streaming platforms (Netflix, Amazon, Disney+, Hulu) — they require soft subtitles in specific formats.
- Web video with HTML5 — WebVTT tracks are the accessibility standard.
- Blu-ray, DVD, digital download — soft subtitle tracks are the standard.
- Multilingual distribution — different audiences choose different subtitle tracks.
- Accessibility — soft subtitles work with screen readers and search; burned-in text does not.
- Content you may need to update — mistakes can be fixed in the subtitle file without re-encoding the whole video.
Can you have both?
Yes. Deliver the video with a soft subtitle track and also publish a separate version with burned-in subtitles for platforms that need it. This is common for content that appears on both a streaming service and social media.
Burning in from an SRT file
If you have an SRT file and need to burn in the subtitles, use FFmpeg:
ffmpeg -i input.mp4 -vf "subtitles=file.srt" -c:a copy output.mp4
FFmpeg reads the SRT and renders it onto every frame. Quality is high, but the video must be re-encoded (which takes time and may slightly reduce quality).
Extracting soft subtitles from a video
If you have a video with soft subtitles and want the subtitle file, use FFmpeg:
ffmpeg -i input.mkv -map 0:s:0 output.srt
This extracts the first subtitle stream and saves it as SRT. The tool may also work with .vtt output if the stream is WebVTT.
Related tools
- SRT to VTT — prepare subtitles for HTML5.
- VTT to SRT — prepare subtitles for burning in.
- SRT Validator — validate before delivery.