メディア新着

概要

WebVTT ⇔ SRT 変換ツール

WebVTT（.vtt）と SubRip（.srt）字幕ファイルをブラウザ内で相互変換。VTT のキュー設定、話者タグ、インラインスタイルを自動除去します。

とはの使い方使用例主な使用シーンよくある質問

カテゴリ hub

メディア

悩み

FAQ

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Hubを見る

#vtt-to-srt #srt-to-vtt #webvtt-converter #html5-captions #subtitle-converter

WebVTT ↔ SRT 変換ツール

WebVTT (.vtt) と SubRip (.srt) を相互変換します。キュー設定・話者タグ・インラインスタイルを自動除去。ブラウザ完結・アップロード不要。

ファイルをアップロード

貼り付けまたはアップロードで変換

解決できる問題

I downloaded captions from YouTube as .vtt — how do I get a clean .srt?

YouTube exports VTT with timestamp markers, color classes, and speaker tags that most SRT editors choke on. Paste the VTT into this tool with VTT → SRT mode; the output is plain SRT with all <c>, <v>, and timing-marker tags removed. Save as .srt and import into Subtitle Edit or Aegisub.

I put an SRT file in <track src="..."> but the captions don't show — why?

HTML5 <track> elements only support WebVTT. Browsers ignore .srt files even if the path is correct. Convert your SRT to VTT here, save with a .vtt extension, and update the src. The captions will load on next page reload.

Why does my VTT file say timestamps are invalid even though the format looks right?

WebVTT requires period decimals (00:00:01.000), while SRT requires commas (00:00:01,000). Mixing them silently breaks parsers. Convert through this tool to normalize the decimal separator instead of fixing it by hand and missing one.

How do I strip <v Speaker> speaker tags from a VTT file?

Convert the VTT to SRT through this tool — <v> blocks are stripped automatically while the inner text is preserved. If you need to keep the file as VTT but without speaker tags, convert VTT → SRT and then SRT → VTT in two passes.

My VTT has NOTE comments — will they appear in the SRT output?

No. NOTE, STYLE, and REGION blocks are dropped during VTT → SRT conversion because SRT has no equivalent. If you rely on NOTE blocks for editorial review, keep a copy of the original VTT alongside the SRT export.

このワークフローのガイド

Supporting guides that connect this tool to the broader category workflow.

カテゴリ hub を開く

メディア guide

ファンサブ字幕ワークフロー総合ガイド：弾幕・ASS・SRT・WebVTT

ファンサブ・アニメ字幕パイプラインの実用ワークフローガイド。Bilibili 弾幕の ASS 変換、ASS/SRT/WebVTT 間の相互変換、フレームレート差の再同期を扱います。

メディア guide

メディアツールハブ：フロントエンドチームのための画像・色・字幕ワークフロー

ブラウザベースの画像圧縮、色変換、字幕処理、およびメディア関連ユーティリティワークフローのガイド。

Web guide

400・401・403・422 を見分ける API エラー切り分け手順

不正なリクエスト、認証失敗、権限不足、バリデーションエラーを混同せずに切り分けるための実践的な API デバッグ手順です。

Web guide

Access-Control-Allow-Origin の * が credentials 付きで失敗する理由

フロントエンドが cookies や認証付きのリクエストを送るときに、Allow-Origin を `*` にしてしまう代表的な CORS ミスをブラウザ目線で整理します。

とは

WebVTT ⇔ SRT 変換ツールとは？

WebVTT and SRT look almost identical at a glance, but they are not interchangeable in practice. VTT supports cue settings (line:90%, vertical:rl), inline tags (<v Speaker>, <c.classname>), NOTE and STYLE blocks, and uses period decimal separators. SRT supports none of that — it expects pure cue blocks with comma decimals.

This converter handles both directions cleanly. Going VTT → SRT, it strips the WEBVTT header, drops NOTE/STYLE/REGION blocks, removes cue identifiers and settings, and rewrites every timestamp from period to comma. Going SRT → VTT, it prepends the WEBVTT header and rewrites the decimal separators. The output stays cue-accurate so downstream tools can consume it directly.

の使い方

WebVTT ⇔ SRT 変換ツールの使い方

1. Pick a direction: VTT → SRT or SRT → VTT.

2. Paste subtitle text into the left pane, or upload a .vtt / .srt file.

3. Output is generated instantly on the right.

4. Copy or download with the correct extension.

使用例

VTT input:
00:00:01.000 --> 00:00:03.500 line:90%
<v Speaker>Hello world</v>

SRT output:
1
00:00:01,000 --> 00:00:03,500
Hello world

主な使用シーン

1. Convert YouTube auto-caption downloads (VTT) to SRT for editing in a desktop subtitle tool.

2. Convert SRT released by translators to VTT for HTML5 video embedding via <track src=…>.

3. Strip VTT cue settings before feeding a translation memory tool that does not understand them.

4. Prepare clean SRT for upload to platforms that reject the VTT speaker/style tags.

よくある質問

What happens to VTT cue settings like line:90% or vertical:rl?v

They are dropped. SRT does not support positioning hints. If you need positioning preserved, target an ASS workflow instead — ASS supports per-cue positioning natively.

Will my SRT cue numbers be preserved when converting to VTT?v

VTT cue identifiers are optional, and your SRT numbers are not carried over by default. VTT renderers do not require them, and adding them can confuse some HLS muxers. If you need stable cue IDs, add them manually after conversion.

Does this support VTT files with multiple cues sharing the same timestamp?v

Yes. Each cue block is parsed independently and emitted as its own SRT entry with sequential numbering, regardless of timestamp collisions.