Start with the video and its timed subtitle file
An SRT or VTT contains the words and their display times. To put those words permanently into a video, you need both the subtitle file and the source video. This workflow burns captions into the picture; it does not add a switchable embedded subtitle track to the MP4.
1. Choose your subtitles before the video
Open the video workspace and use Have subtitles? Add SRT / VTT. Choose the file, then upload your MP4, MOV or WebM. The existing timed text is used instead of starting automatic transcription. If you began in a subtitle file tool, use its video-editor link to carry your current result into the next step in the same browser tab.
2. Match the timeline
The last subtitle must fit inside the video. Play the first spoken line and a line near the end. If the entire file is late by two seconds, use a -2 second offset in the subtitle shifter before importing. If you cut a segment from a longer video, use the subtitle splitter with the matching start/end times and reset the result to zero.
3. Correct the words and timing
Inside the project, open Subtitles. Select a cue to seek to it, edit the words and adjust its start and end. Split a long cue or merge adjacent cues when it helps reading. Importing a replacement file changes the subtitle draft, so check it first and use Undo if you chose the wrong file. Formatting from the source file is simplified to text and timing.
4. Style and export
Pick a caption style, size and position. Watch a representative moment at phone size, including long lines and punctuation. Export video to render an MP4, then download the completed result. The free plan has a watermark and 720p limit; sign-in and paid export features follow the current pricing page. Keep the original video because the burned-in words cannot be removed as a separate track.
Need a file rather than words in the picture?
Use a separate SRT or VTT with a compatible destination player when captions should be optional. Video-project subtitle-file downloads require Pro or Max. For editing or converting a subtitle file you already have, the free browser tools can download the revised file without uploading a video.