How to add captions to short videos automatically
5 min read · Updated
Adding captions by hand means typing every word and lining it up with the audio. Automatic transcription does the first pass in minutes, so your time goes into the part that matters: checking the words and choosing a style people can read on a small screen.
1. Start from the best audio you have
Captions are only as accurate as the recording. Clear speech, a decent microphone and little background noise make the biggest difference. If you can, use the original recording rather than a copy that has already been compressed by an app.
2. Let the transcript do the first pass
Upload the video and let speech-to-text produce the words with a time for each one. Word-level timing is what lets captions follow the speaker instead of sitting on screen as a block of text. Expect a good draft, not a perfect one.
3. Correct names, jargon and numbers
Automatic transcripts stumble on names, brand words, accents and fast speech. Read the text once with the video playing and fix what is wrong. This takes a few minutes and is the difference between captions that look professional and captions that distract.
4. Choose a style that is easy to read
Use large, bold text with strong contrast, two or three words at a time, kept in the middle band so app buttons don’t cover it. Highlighting the word being spoken keeps the eye on the speaker. Our guide to caption styles covers the choices in more detail.
5. Burn them in, and export an SRT too
Burned-in captions are part of the picture, so they appear on every platform. An SRT file is the same text with timing, which you can upload separately where a platform supports it. Keep both: the SRT is also handy if you later need subtitles in another language.
6. Check on a phone before posting
Watch the finished clip on a real phone, with the sound off. Confirm that nothing is hidden behind buttons, every word is correct and the text never covers an important part of the picture.
Common mistakes
These make otherwise good videos look unfinished:
- Posting the raw transcript without reading it
- Text too small to read without squinting
- Captions placed where the app’s buttons and username sit
- Long lines that make the viewer read instead of watch
- Highlight colours that clash with the footage
Where Snipster fits
Snipster transcribes your upload, shows word timing, lets you edit the text and picks from several caption styles, then exports the video with captions burned in plus an SRT file. Accuracy depends on your audio, so always read the words before you export.