Burn Subtitles Into a Video
Paste your SRT or WebVTT captions and they're baked into the video — always visible, even on silent autoplay. Everything runs in your browser; nothing is uploaded.
About this tool
Burn an SRT or WebVTT subtitle track directly into a video so the captions are part of the pixels, not a separate sidecar file. That makes the result reliable on social feeds, messaging apps, muted autoplay, and players that do not load subtitle tracks.
Upload a video, paste the subtitle file contents, then choose the caption position, font size, text color, and optional background bar. Processing runs locally in your browser with ffmpeg; your source video is not uploaded to gizza.ai.
Worked example
Paste a caption track like this:
1
00:00:00,000 --> 00:00:02,000
Welcome to the demo
2
00:00:02,000 --> 00:00:04,000
These captions are burned in
Then upload a clip and keep the default bottom position, 24 px white text, and semi-transparent black background. The output is a playable video with those two captions permanently visible at their timed windows.
Limits and edge cases
- Accepts SRT and WebVTT timing lines. Inline styling tags such as
<i>are stripped to plain text. - Up to 200 KB of subtitle text and 400 cues are accepted to keep the browser ffmpeg filter graph bounded.
- Videos are limited by the browser and the shared gizza media cap; large server-style batch jobs are out of scope.
- Output is H.264 video. MP4, MOV, M4V, and MKV inputs keep their container when possible; other containers are returned as MP4.
- ASS/SSA styling, custom fonts, and per-word karaoke effects are not interpreted.
FAQ
What does “burn subtitles into a video” mean?
It means the captions become part of every video frame. The result does not need a separate .srt file, so the text stays visible when you upload the clip to sites or apps that ignore subtitle tracks.
Can I use WebVTT as well as SRT?
Yes. Paste either SRT timing lines with commas, such as 00:00:01,000, or WebVTT timing lines with periods, such as 00:00:01.000. A WEBVTT header and cue settings are accepted.
Why are my italic or colored subtitle tags not preserved?
This tool intentionally renders a plain, consistent caption style across the whole video. Basic inline tags are stripped so they cannot break the ffmpeg filter graph; use the page controls for the global text color, size, position, and background bar.
Does the video leave my computer?
No. The page runs ffmpeg in your browser and returns a local data URL for the captioned result. The CLI version processes the file on your machine as well.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool video-caption-burner 'url=https://example.com/input' 'subtitles=1
00:00:01,000 --> 00:00:04,000
Hello, world!' 'position=bottom' 'font_size=24' 'background=true' 'background_opacity=0.5'New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/video-caption-burner/?url=https://example.com/input&subtitles=1%0A00%3A00%3A01%2C000%20--%3E%2000%3A00%3A04%2C000%0AHello%2C%20world%21&position=bottom&font_size=24&background=true&background_opacity=0.5Machine-readable descriptor: tool.json — title + parameters JSON Schema for agents.