Auto Subtitle Generator for Video: Step by Step
An auto subtitle generator turns the speech in your video into timed subtitles without manual typing. Here is how to use a free video subtitle generator from start to finish, add subtitles to a video online, and what to check before you publish.
Prepare your video
Use the final cut of your video so timings match. MP4, MOV, WebM and MKV all work, as do audio files such as MP3 and WAV. Landscape, vertical and square videos are fine.
Drop the file and choose options
Drag the file into the subtitle generator for video, pick the spoken language (or leave auto-detect on) and choose a quality mode. Balanced suits most videos.
Let the AI write the subtitles
The auto subtitle generator listens to the audio, skips silence and writes timed lines while you watch a progress bar. Everything runs in your browser.
Review in the editor
Play the video with the live caption preview, click any time code to jump there and correct names or technical words.
Download and add the subtitles
Download SRT or VTT, then upload it to YouTube, Vimeo or social platforms, or import it into your video editor.
What an auto subtitle generator actually does
An auto subtitle generator listens to the audio track of your video, turns the speech into text and attaches a start and end time to every line. The result is a subtitle file you can load into a player, a video editor or a platform such as YouTube. Because the whole first draft is written for you, your job shifts from typing to checking.
That change matters most on longer videos. Typing out a ten-minute talk by hand and setting every timing is slow work. With automatic subtitles you wait a few minutes for the draft and spend your time on the parts that need a human eye: names, product terms and the occasional number.
Which videos work best
Automatic subtitles work with almost any video that has speech: tutorials, interviews, lectures, vlogs, product demos, webinars and screen recordings with narration. The cleaner the voice, the cleaner the text. A presenter close to a microphone in a quiet room gives the AI an easy job, while a street interview with wind and traffic gives it more to untangle.
If you have a choice, record the voice on its own track or move the microphone closer. You can also pick a higher quality mode when the audio is less than perfect; it takes longer but listens more carefully.
Choosing the right quality mode
- Fast is the smallest model and downloads in seconds. It is a good fit for clear speech and quick drafts.
- Balanced is the sensible default for most videos and gives a good mix of speed and care.
- High accuracy uses the largest model. Pick it for accents, technical vocabulary, fast talkers or noisy rooms.
- Best quality About 570 MB. The most accurate option, running on your graphics card. Shown on desktop browsers with WebGPU.
The first time you run a mode, the browser downloads its model once and keeps it, so the next video starts much faster.
Editing and exporting the result
Once the subtitles appear, play the video and read along. Click any time code to jump to that moment, fix names and spelling in the text box, and delete any line you do not need. Edits show up in the preview straight away, so you can see exactly what viewers will see.
When you are happy, download SRT for YouTube, Vimeo, social platforms and editors, VTT for web players, or plain TXT if you want a transcript. If you plan to polish the look in an editor, our guide on using an SRT file in Premiere Pro or DaVinci Resolve shows the next step.
Quick tips
- Clean audio gives the best automatic subtitles.
- Split very long videos into chapters.
- Keep a copy of the SRT for future edits.
Ready to try it? Drop a video or audio file into the free subtitle generator and have subtitles in minutes. Open the generator →