Are Subtitle Files Uploaded?

No. Reading, parsing, conversion and download happen in the current browser tab.

Can It Fix Individual Mistimed Captions?

The timing shift applies to the entire track. Edit individual cue timestamps in the source editor when only some captions are out of sync.

Does It Preserve WebVTT Styling?

No. It preserves standard cue times and text, but not advanced regions, style blocks or cue-position settings.

Subtitle Converter & Caption File Maker

Transcribe audio or video locally, review editable cues, and convert captions to SRT, WebVTT, SBV or document formats.

Transcribe Audio Or Video

Create editable captions from speech without uploading your recording. The first run downloads a speech model (roughly 45 MB, plus runtime); processing can take several minutes on a desktop. Up to 10 minutes / 100 MB. Audio formats depend on browser support.

RecordingSpoken Language

Whisper Tiny is a compact speech model, not a guaranteed transcript. Names, accents, music, silence and overlapping speakers can cause errors or invented words. Review timestamps and text in the existing caption editor; speaker diarization is not included.

Caption Authoring & Conversion Desk

Edit dialogue, repair timing, inspect readability and convert tracks locally without silent word loss.

100% Dialogue Preserved

10 / 10 words · 2 cues

Output FormatShift TimingsecTiming Speed%Open Caption FileReview With Media

Find DialogueReplace With

Remove Styling Tags From Output

Add Caption Cue

New cues are inserted in chronological order.

Start TimeEnd TimeCaption Text

Cue Index

Selected Cue

Cue 1

Start TimeEnd TimeExact Caption Text

Source CaptionsConverted Captions

WEBVTT

00:00:01.000 --> 00:00:04.000
Welcome to BrowserTools.

00:00:05.250 --> 00:00:08.000
Every spoken word stays in the track.

Timing & Readability Review

0 flagged / 2 cues

Cue	Duration	Characters / Second	Longest Line	Review
1	3.00s	7.3	24	Within Common Limits
2	2.75s	11.3	37	Within Common Limits

The integrity audit guarantees that every parsed dialogue word reaches the converted track in the same order and blocks export when a source block cannot be read. It does not perform speech recognition or prove that an existing transcript matches the recording; use the local media reviewer to verify spelling, names and spoken accuracy.

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What Is the Subtitle Converter & Caption File Maker?

The Subtitle Converter & Caption File Maker parses SRT, WebVTT and SBV, blocks export when any source block would lose words, and reports exact parsed-dialogue preservation. Its cue editor can add, edit, split, merge, delete, sort, wrap and repair overlaps while a local audio/video reviewer helps confirm names and spelling.

How It Works

Open a caption file or create a track. Correct any blocked source blocks, edit cues in the indexed workspace, optionally load local media for comparison, then choose SRT, WebVTT, SBV, transcript, CSV or JSON output. Export is enabled only when every parsed dialogue word reaches the output in order.

When to Use It

Use it to transcribe audio or video locally, then review, author, repair or convert timed text. Speech recognition can make mistakes; conversion checks do not prove that the transcript matches the recording.

Frequently Asked Questions

Are Subtitle Files Uploaded?: No. Reading, parsing, conversion and download happen in the current browser tab.
Can It Fix Individual Mistimed Captions?: The timing shift applies to the entire track. Edit individual cue timestamps in the source editor when only some captions are out of sync.
Does It Preserve WebVTT Styling?: No. It preserves standard cue times and text, but not advanced regions, style blocks or cue-position settings.

Found an issue? Send Feedback. See our data sources and update policy for tools that depend on changing information.