# Burn In Subtitles — Burn subtitles into a video on Mac

Render an SRT or VTT file permanently onto the picture. Part of OneMacTools, 151 private tools in one native Mac app (macOS 26 or later); category: Video. Runs on your Mac; nothing is uploaded.

Drop a video and its .srt or .vtt file. Subtitles are drawn onto the video in a clean, readable style with a subtle background, so they show on every player and platform.

Page: https://www.onemactools.com/tools/burn-in-subtitles · Download: https://www.onemactools.com/download · Pricing: https://www.onemactools.com/pricing

## How to use it
1. **Drop the video and its subtitles.** Add the video and its .srt or .vtt file together. You can add several videos and each gets the same subtitles.
2. **Set the text size.** Use the Text size slider in the right-hand panel if the captions need to be bigger or smaller.
3. **Click Burn In.** Each caption is drawn onto the picture at the right time, in white text on a soft dark background near the bottom.
4. **Check the captions.** Copies ending in “subtitled” are saved as MP4 in a new dated folder in Downloads › OneMacTools. Watch them with the Preview (eye) button or Show in Finder. Your video and subtitle file are untouched.

## Options
- **Text size:** From 50% to 200%, 100% by default. 100% scales the text to the video's size, so captions look similar on a phone clip and a 4K video. Raise it for small screens or viewers who need larger text.

## Tips
- Burned-in captions can't be switched off. Keep the original video too, in case you want a clean version later.
- Most social video is watched muted, so captions keep people watching. Try 120–140% for vertical clips that are seen on phones.
- No subtitle file yet? Use Auto Subtitles, which transcribes the speech and adds the captions in one go.
- Formatting tags such as italics in the subtitle file are removed, so every caption is shown in the same clean style.
- Check the timing in the subtitle file first. Captions appear exactly when the file says, so a file made for a different cut will be out of sync.

## Questions
**How do I burn subtitles into a video on a Mac?**
Drop the video and its .srt or .vtt file onto Burn In Subtitles together and click Burn In. The captions become part of the picture.

**What's the difference between burned-in and normal subtitles?**
Normal subtitles are a separate track viewers can turn on or off, and some players ignore them. Burned-in subtitles are part of the picture, so they show everywhere but can't be hidden.

**Can I change the subtitle style?**
You can change the size with the Text size slider. The style is fixed: white semibold text on a rounded, semi-transparent dark background near the bottom.

**Does it work with VTT files?**
Yes. Both .srt and .vtt files work. Formatting tags are removed so the text is shown cleanly.

**Why does it say my video has no video track macOS can read?**
Burn In Subtitles uses macOS's own video tools, which can't open MKV or WebM files. Convert the video to MP4 with Convert Video and try again.

**How do I make subtitles if I don't have a file?**
Use Auto Subtitles, which transcribes the speech on your Mac and adds captions automatically, or Transcribe to get an .srt file you can edit first.