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Toolmivo
Toolmivo
Subtitle Tools

Online Subtitle Editor for SRT & VTT

Edit SRT files online and fix subtitle timing in your browser: correct text, adjust start and end times, shift every cue to sync with your video, and add, delete or reorder cues. Works with SRT and VTT, and you can preview the captions on your own video as you edit.

  • Free, no sign-up
  • Files stay on your device
  • No watermark
  • Works on desktop & mobile

Drop an .srt or .vtt file to edit

Up to 5 MB. Opened on your device only.

No file?

How to use the subtitle editor

  1. 1
    Open an .srt or .vtt file (or start from scratch).
  2. 2
    Edit cue text and timestamps. Times use minutes:seconds.milliseconds, for example 01:23.450.
  3. 3
    Optionally add your video to preview captions, then use “Set start” and “Set end” to sync cues to the playhead.
  4. 4
    Fix any highlighted errors, choose SRT or WebVTT and export.
tips & examples

Getting the best results

Fix a constant delay

If every subtitle is early or late by the same amount, use Shift with “Later” or “Earlier” on all cues instead of editing each one.

Readable timing

Aim for cues of roughly 1–7 seconds and no more than two short lines, so viewers can read them comfortably.

Converting only?

To switch formats without editing, the SRT to VTT converter is faster.

faq

Subtitle Editor questions

How do I fix subtitles that are out of sync?

If every line is early or late by the same amount, open the file, enter the offset in seconds and select Later or Earlier to shift all cues. To fix only part of the file, select those cues first. See how to sync subtitles with video.

How do I edit SRT file timing manually?

Click a cue's start or end time and type a new value such as 01:23.450 (minutes:seconds.milliseconds), then press Enter. With a video loaded, you can also play to the right moment and use Set start or Set end.

What do the warnings and errors mean?

Errors (red) must be fixed before exporting: every cue must end after it starts. Warnings (amber) flag cues that overlap or are out of chronological order; players usually tolerate them, and “Sort by time” fixes ordering.

Can I undo changes?

Yes. Undo and Redo cover edits, additions, deletions, reordering and timing shifts. “Revert to original” restores the file as you opened it (and can itself be undone).

Which video formats can I preview?

Any format your browser can play, typically MP4 (H.264), WebM and, in Safari, MOV. The video is only used for preview.

Is my work saved?

No. Nothing is stored on a server or in your browser. Export your file before closing the tab.

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