What does Subtitle Editor & Utility do?
Tubelexity combines a manual subtitle editor with SRT/VTT conversion, timing shifts, file merging and burn-in export. Edit cue text and exact start/end times beside a local video, split, merge, duplicate, reorder and search cues, then validate overlaps before export. It does not generate or transcribe captions.
How to use Subtitle Editor & Utility
- 1Choose Edit, Convert, Shift, Merge or Burn into video.
- 2Load local SRT or VTT files and review any validation warnings.
- 3Edit timing, text, cue order or burn-in styling and preview the result.
- 4Download the converted subtitle or locally rendered video.
Supported inputs and outputs
Inputs
SRT, VTT, MP4/MOV/WebM for burn-in
Outputs
SRT, VTT, MP4 with burned-in subtitles
Practical uses
- Converting SRT captions to WebVTT
- Fixing a subtitle timing offset
- Combining two caption tracks
- Rendering permanent captions into a video
Browser and media limitations
- Malformed cues require correction before export.
- Negative shifts may clamp cues at zero.
- Burn-in rendering downloads FFmpeg on first use.
- Burn-in glyph coverage depends on the bundled subtitle font.
How local processing works
Subtitle parsing happens in the browser. Burn-in export uses locally loaded FFmpeg.wasm; subtitle text and video are not transmitted to Tubelexity.
Frequently asked questions
Can I convert SRT to VTT?
Yes. The converter preserves cue timing and multiline text, normalizes line endings and downloads a VTT file.
Can I shift subtitles earlier or later?
Yes. Apply a positive or negative offset in seconds or milliseconds and preview the changed cues.
Can I merge two subtitle files?
Yes. Choose their order, optionally offset the second file and review overlap warnings before download.
Can I burn subtitles into a video?
Yes. Load an existing SRT or VTT file, adjust styling and render captions locally into an MP4.
Does this tool generate subtitles automatically?
No. It edits subtitle files you already have and does not use transcription or AI.