Subtitle editor — edit SRT & VTT in your browser
Import captions, edit text and timing, split or merge cues, check reading speed and preview against your own local video. Export without uploading.
Local files and edits stay in this tab. Export before closing; nothing is saved to your account. UTF-8 up to 1 MiB / 5,000 cues. No model calls.
How to use it
- Enter your own input, or load the labelled example.
- Run the tool and review its complete result and limitations.
- Download the draft or report, then check it in your intended workflow.
What to check
Local editing only. No transcription, translation, cloud saving or video encoding. Export a copy before leaving. Your local video is never uploaded; preview support depends on your browser codec.
Examples and common questions
Can I compare two subtitle versions?
Import your working captions, then open Compare subtitle versions and paste or open a reference SRT/VTT. The report separates text changes, timing changes and missing cue positions. It matches by position, so an insertion may shift later comparisons; it does not align speech or overwrite either version.
Should I change SRT timestamps when the video frame rate changes?
Keep timestamps when the new video has the same playback duration. Only a known playback-speed change needs scaling: new time equals old time multiplied by source fps divided by target fps. For 24 to 25 fps speed-up, 10 seconds becomes 9.6 seconds. Preview before applying, then export a copy and review against speech.
Can I edit SRT subtitles without uploading a video?
Yes. Import a plain subtitle file, edit cue text and millisecond timings, then preview and export SRT or VTT. An optional local video helps you check synchronization without uploading it.
Does the subtitle editor transcribe audio?
No. It edits supplied captions. TXT import creates estimated intervals per paragraph; those times must be manually synchronized against speech. No speech recognition is performed.
How do split, merge and undo work?
Split divides the selected caption at the text cursor and halves its time interval. Merge joins the next caption and spans their combined time. Undo restores one of the last twenty editing steps; download before leaving the tab.
Continue: Subtitle editing
- SRT to VTT converter — SBV, TTML, TXT & CSV
- Subtitle time shifter
- Subtitle reading speed checker
- Subtitle to text
- Subtitle timing summary
- Subtitle line breaker
- Fix a constant subtitle delay, then check readability
- SRT vs VTT: convert plain subtitles and check the result
- SRT subtitles
- WebVTT
- Subtitle synchronization
- Shift subtitles and convert SRT to VTT
Working on a specific brief? Request a sample to discuss scope and availability.
Keep your workflow moving
What would you like to do next?
A few useful next steps. Open a tool and bring your own file or text.
SRT to VTT converter — SBV, TTML, TXT & CSV
SRT or VTT file
Convert plain SRT, VTT, SBV or supported TTML captions; add estimated timing to TXT. Preview SRT, VTT, TXT or CSV locally.
Example preview
00:00:01,000 → 00:00:03,000
00:00:01.000 → 00:00:03.000
Subtitle reading speed checker
Readability report
Locate overlaps, ordering problems, long lines and fast captions using your own thresholds.
Example preview
A cue + your reading limits
Cue-level review report
Timecode calculator
Frame-accurate calculation
Add and subtract timecodes, measure an end-exclusive clip and convert frame rates. Explicit drop-frame and rounding rules.
Example preview
25 fps · NDF · 00:01:00:00 + 00:00:30:00
00:01:30:00 · 2,250 frames
Free deterministic tool · updated November 4, 2026.