Add Subtitles to Video
Add subtitles inside a video: transcribed on your device or from an .srt file, edited, then burnt into the picture for Instagram, TikTok and WhatsApp.
What it does
Add Subtitles to Video works on MP4, MOV, M4V, WEBM and MKV with ffmpeg and audio engines compiled for the browser, so the recording or video is processed by your own computer or phone — the same programs a desktop editor uses, without installing one.
When you need it
Usually right before sending or publishing: a video too heavy for WhatsApp, a voice note full of hum, a clip that needs captions because the feed plays it muted, an interview to turn into text.
Limits and caveats
Long or high-resolution files take as long as your device needs, and a phone is slower than a laptop. The engines download once, the first time, and come from KIVO itself. The original file is never changed: you always download a new one. Everything happens in your browser, so the file never leaves your device.
How to add subtitles to video
- Drop or choose your MP4 file.
- KIVO processes it instantly — no waiting for uploads.
- Download the result. That's it.
Frequently asked questions
- Can I fix the words before they are drawn?
- Yes: the subtitles appear as editable text, with their times, before the video is encoded.
- Why burn them in rather than use a subtitle file?
- Most social apps ignore subtitle files and play videos muted. Burnt-in captions are always seen; keep the .srt as well for players that use it.
- Do my files get uploaded?
- No. This tool runs entirely in your browser, so the file never leaves your device.