Check and shift your subtitles.

A free SRT subtitle checker and time shifter. Review each finding and export in your browser, with no account required.

Processed in your browser.

SRT source

Editable text

Select a finding to edit its block. Pasting over all text starts a new document.

UTF-8 · up to 1 MB3 readable cues

Review

Updates as you edit

0Format errors

3Review findings

3Cues read

Review settings

Match these thresholds to your delivery brief.

Characters / secondCharacters / lineMinimum seconds

Compare original and current source No source changes

Opening a file, loading an example, replacing all text by paste, or loading through an assistant starts a new original. Timing shifts are shown separately in the export preview. Recent undo history stays in this tab.

Timing & export

Export renumbers cues and standardizes line endings. Your text and cue order stay as written; a time shift moves every cue equally.

Time shift, seconds

Earliest cue: block 1 at 00:00:01,000. To move earlier, use −1.000 s or closer to 0. Positive values delay every cue. Preview the result against your video.

Open the full export preview No timing shift

1
00:00:01,000 --> 00:00:04,000
A quiet room. A familiar voice.

2
00:00:03,750 --> 00:00:06,500
This cue begins before the first one ends.

3
00:00:07,000 --> 00:00:08,000
This sentence needs a little more time to read comfortably.

Working with an AI assistant?

Let a browser-capable assistant check your SRT, review findings, and prepare a time-shifted export.

See the assistant guide

How to read the findings

Subtitle repair guides

Format errors: Unreadable timing lines, impossible time values, empty cues, or end times before start times block export. Fix them in the source text.
Review findings: Overlap, long lines, short durations, and fast reading speeds need a viewing decision. They can be intentional; check the video and your delivery brief.

The checker reads subtitle text and timing. Review the video for audio sync, translation, speaker labels and placement. A clear report does not certify accessibility or platform compliance. Read the method and limits.