Choose your SRT
Select or drop one subtitle file. Unicode BOMs are detected automatically, with an explicit selector for supported legacy encodings.
Subtitle Tools
Subtitle Time Shifter
Delay or advance every cue in an SRT file by one exact offset. Preview the change in milliseconds, seconds, or HH:MM:SS.mmm while preserving subtitle text, duration, order, gaps, and overlaps.
Browser-local SRT timing
Shift every cue by one exact offset
Checking the SRT locally
Decoding, validating, and parsing subtitle cues…
Choose the original text encoding
is not valid UTF-8. Select its known encoding; BrowserPine will not guess silently.
The SRT could not be processed
Source ready
Choose one fixed timing offset
- File size
- Encoding
- Cues
- Earliest start
- Latest end
- Safe advance
- Overlaps
- Structural findings
Decimal seconds are rounded once to the nearest millisecond.
Review these non-blocking source findings
Safe structural normalization is reported. Cue text and timing relationships are not cleaned or edited.
Live timing summary
Exact shift preview
Calculated from the original parsed SRT. Changing the controls does not stack shifts or reparse the file.
- Direction
- Requested
- Signed offset
- Cues
- Earliest before
- Earliest after
- Latest before
- Latest after
- Span before
- Span after
- Maximum safe advance
- Overlaps / findings
- /
Before / After preview
A bounded representative preview is shown for this larger file.
Shift complete
Your shifted SRT is ready
The file was regenerated from the original selected file, reparsed, and checked for exact cue timing, duration, order, and text preservation.
- Download file
- Output size
- Cues
- Direction
- Applied amount
- Signed milliseconds
- Earliest start
- Latest end
Local processing
Your subtitle timing stays on your device
The SRT file is decoded, validated, shifted, serialized, and verified in a route-specific browser worker. BrowserPine does not upload, log, or persist subtitle content or timing values, and no account is required.
Read how BrowserPine handles filesThree simple steps
How to shift SRT subtitle timing
Set one offset
Choose Delay or Advance, then enter a non-negative amount in milliseconds, seconds, or HH:MM:SS.mmm format.
Preview and download
Review representative before-and-after cue timings, shift from the original file, and download the verified UTF-8 SRT.
Fix subtitles that are consistently early or late
If every subtitle appears too early by the same amount, delay the file to move all cues later. If every subtitle appears too late, advance the file to move all cues earlier. One signed integer-millisecond offset is added to every start and end timestamp.
Because the same value is added everywhere, cue durations, relative gaps, overlap relationships, source order, multiline text, Arabic and RTL marks, emoji, punctuation, speaker labels, and recognized formatting remain unchanged. Output numbering and line endings use the approved normalized SRT structure.
Choose the right subtitle timing tool
Use Time Shifter when the mismatch stays constant from beginning to end. If synchronization gets progressively worse, use Subtitle FPS Converter instead: it proportionally scales the timeline to correct frame-rate drift. If only individual cues are wrong, use Subtitle Editor for cue-by-cue changes.
Advancing is blocked when any timestamp would become negative. The page reports the maximum safe advance for the selected file and allows the exact boundary where the earliest cue begins at 00:00:00,000. Large delays are also blocked before they could exceed exact timestamp limits.
Common questions
Subtitle Time Shifter FAQ
How do I fix subtitles that always appear too early?
Choose Delay subtitles and enter the constant amount they need to move later. The same exact millisecond offset is added to every cue.
How do I move subtitles earlier?
Choose Advance subtitles and enter a non-negative magnitude. The tool applies it as a negative offset, but blocks the operation if any cue would move below zero.
What is the difference between Time Shifter and Subtitle FPS Converter?
Time Shifter adds one fixed offset to every cue and fixes a constant early-or-late mismatch. FPS Converter proportionally scales the timeline when synchronization drift grows over time.
Will shifting change subtitle text or cue duration?
No. Cue text, line structure, Unicode characters, order, durations, relative gaps, and overlaps are verified against the original parsed SRT before the download is offered.
Can I enter fractional seconds?
Yes. Seconds such as 1.5 are converted deterministically and rounded once to the nearest integer millisecond. The normalized signed millisecond value is shown before shifting.
What happens if an advance would create a negative timestamp?
Nothing is generated. The operation is blocked without clamping, shortening, or dropping cues, and the maximum safe advance for that file is shown.
What encoding does the shifted SRT use?
The output uses UTF-8 without a byte-order mark, standard HH:MM:SS,mmm timestamps, CRLF line endings, sequential cue numbers, one blank line between cues, and a final newline.
Is my SRT uploaded to a server?
No. Decoding, parsing, timing transformation, serialization, and verification occur locally in your browser, and subtitle content is not persisted by the tool.
Keep working
Related subtitle tools
Available
Subtitle FPS Converter
Scale SRT cue timings between a source and target frame rate.
View tool
Available
Subtitle Editor
Review and edit SRT cue text, timing, order, and file sections.
View tool
Available
SRT Cleaner
Normalize SRT structure and preview optional formatting, SDH, speaker-label, or duplicate cleanup.
View tool