Delay subtitles by 1.5 seconds after a video starts later
Before
00:00:05,000 --> 00:00:07,200
After
00:00:06,500 --> 00:00:08,700
Note: Use a positive shift when the subtitles appear too early.
Subtitle timing adjustment and format conversion
SRT / VTT Subtitle Shift & Convert
Open an SRT or VTT subtitle file in the browser, shift all subtitle timings forward or backward together, convert between SRT and VTT, and download the cleaned result without sending the file to a server.
Supported formats
.srt.vttLocal browser processing
Subtitle timing and format controls
Upload one subtitle file, adjust the timing shift, choose the output format, and review the result before download.
Subtitle file
Choose one SRT or VTT file, or drag and drop it here.
The file stays in the browser. Parsing, timing shift and conversion all run locally.
Timing shift
If a negative shift moves a cue before 00:00, the cue is clipped at the start of the timeline.
Shift direction
Format conversion
SRT uses cue numbers and commas in timestamps. VTT uses a WEBVTT header and dots in timestamps.
Output format
Subtitle parsing, shifting and conversion stay inside the browser. The site does not include a mechanism that sends this tool input for AI training.
Subtitle preview and timing list
Preview ready
No subtitle file selected yet
Add one SRT or VTT file first and the source text, timing list and processed preview will appear here.
What you can do
- Load one SRT or VTT subtitle file directly in the browser
- Shift every subtitle cue forward or backward in milliseconds or seconds
- Convert SRT to VTT or VTT to SRT while normalizing numbering and headers
- Review raw text, timing changes and the processed output before download
Who this is for
- People fixing subtitle timing after a video export changed the sync
- Language learners adjusting subtitles to match a different release or audio delay
- Editors who need a quick subtitle format conversion without opening a full subtitle editor
How to use it
- 01
Add the subtitle file
Choose one SRT or VTT file, or drag and drop it into the upload area.
- 02
Set the timing shift
Choose plus or minus, enter the amount, and select milliseconds or seconds.
- 03
Choose the output format
Keep the original format or convert the subtitle file to SRT or VTT.
- 04
Review and download
Compare the original text, processed text and timing list, then download the updated subtitle file.
Examples
Move subtitles 300ms earlier and convert VTT to SRT
Before
00:01:12.400 --> 00:01:14.000
After
00:01:12,100 --> 00:01:13,700
Note: Useful when a VTT track needs to be opened in a player or editor that expects SRT.
Things to watch
- If a negative shift pushes cues before 00:00, this tool clips them to the start of the timeline.
- VTT-only extras such as header blocks or style blocks are not preserved when the output format is SRT.
- Broken or highly unusual subtitle files may fail to parse if their timestamp lines are malformed.
FAQ
What is the main difference between SRT and VTT?
SRT uses numeric cue lines and commas in timestamps, while VTT uses a WEBVTT header and dots in timestamps. VTT can also carry more web-oriented metadata.
When should I use a positive or negative shift?
Use a positive shift when subtitles appear too early. Use a negative shift when subtitles appear too late.
Does this upload my subtitle file anywhere?
No. The tool is designed to parse, shift and convert subtitle files locally in the browser.
Related tools
Related articles
Update history
Added the subtitle shift and conversion tool with local SRT/VTT parsing and download support.
Added bulk timing shift, SRT/VTT conversion, timestamp preview and basic formatting normalization.