Add Subtitles to a Video

Paste the script you recorded from, or let the editor write down what's said, and it times each line to your video. Pick a style, save an MP4 with the subtitles in the picture, and your video never leaves your device.

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How to Add Subtitles to a Video

Open the video editor and drop your video on it, or click to choose it. MP4, MOV and WebM work best.
In the Subtitles tool on the left, paste the script of your voice-over into the box and press Match to the video. The editor listens for the pauses and loudness in the sound to find when each line is spoken. No script? Press Write subtitles for me and the editor writes it from the speech, in English or one of 13 other languages you choose in the menu next to it.
Check the result. Subtitles with a dashed edge on the timeline are worth a second look: click one and press Space to hear it, drag its edge to fix the timing (the ones around it re-fit), or double-click it to fix a typo.
Under Style, choose one of the twelve subtitle styles, from Classic to Karaoke and Lower third. The font, size, colours and height are under More options.
Press Save MP4 at the top right. The subtitles are burned into the picture. For a separate subtitle file instead, untick Burn into video and press Save subtitles (.srt) in the Subtitles tool.

Questions

Does it write the subtitles for me?

Yes, in English and 13 other languages, such as Spanish, German, French and Russian: choose the language next to Write subtitles for me and press it. The first time, it downloads a speech model of about 85 MB, which then runs on your device; see auto-generate subtitles. If you already have subtitles, press Load .srt or .vtt instead.

Which languages work?

Writing the subtitles for you works in English, Spanish, Portuguese, French, German, Italian, Dutch, Polish, Romanian, Czech, Swedish, Russian, Ukrainian and Turkish; English gives the most accurate words. Matching a pasted script times it from the sound, not the words, so it works for scripts in other languages and alphabets too. We have tested it most on English speech.

What if some lines are out of time?

That happens when the recording strays from the script, for example a skipped line or a retake. Drag the edge of a subtitle to where it should be; the subtitles between your fixes re-fit on their own.

Is my video uploaded anywhere?

No. The editor runs in your browser, and the video, the script and the saved file stay on your device.