Free · No upload · No sign-up
Burn Subtitles into Video
Hardcode SRT / ASS / VTT captions into your MP4 so they show up on every player, every device, every platform — entirely in your browser.
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Drop your video here
MP4, MOV, MKV, WebM — up to 4GB. Processed in your browser.
Why this tool
Plays everywhere
Hardcoded subtitles render as pixels, so they survive Instagram, TikTok, WeChat, embedded players — anywhere that ignores subtitle tracks.
Private by default
Both the video and subtitle file stay in your browser. No upload, no retention, no server processing.
Readable on any screen
Black outline + 24–32pt font, tuned for mobile and desktop. Pick Cinema for classic yellow-on-black.
How to burn subtitles into a video
- 1Drop your video (MP4 / MOV / MKV / WebM) above.
- 2Drop your subtitle file (.srt, .ass, or .vtt).
- 3Pick a style preset (Default / Large / Cinema) and a quality preset.
- 4Click Burn subtitles. The output is a new MP4 with the text rendered directly into the video frames.
Frequently asked questions
- What's the difference between hardcoded (burned) and soft subtitles?
- Soft subtitles are a separate track the viewer can toggle; they break on platforms that strip or ignore caption tracks (Instagram, TikTok, many embedded players). Hardcoded subtitles are part of the picture — they play everywhere, but they cannot be turned off or translated.
- Which subtitle formats are supported?
- SubRip (.srt), WebVTT (.vtt), and Advanced SubStation Alpha (.ass). ASS gives the richest styling; SRT is the most common format.
- Will my styling from the ASS file be preserved?
- Yes. ffmpeg reads ASS styles natively. Our style presets only apply when your source is plain SRT / VTT without built-in styling.
- Does Clapr upload my video?
- No. The video and subtitles stay in your browser tab — conversion runs via ffmpeg.wasm locally.
- Can I burn in a different language's subtitles?
- Yes. Any language that your browser's font system can render works. CJK / Arabic / RTL text renders correctly as long as fonts are available in your OS.
- What about file size limits?
- Video up to 4GB; subtitle file up to 16MB. Very long videos may be slow — on low-RAM devices, split into shorter sections first.
- Is there a watermark?
- Never. You own the output 100%.