Free online VTT to OGG converter

VTT captions are sometimes needed as spoken audio for audio-only playback, accessibility, or listening to a video’s dialogue without the video. Converting them to OGG requires text-to-speech: a VTT file contains subtitle text and timing, not recorded sound.

What the VTT format is

WebVTT files use the .vtt extension and store timed text cues, often with speaker labels or basic formatting. Video platforms, screen-recording tools, and subtitle editors create or export VTT files; they are commonly used for captions on web video.

What the OGG format is

OGG is a media container commonly used for compressed audio encoded with Vorbis. It suits web playback and audio sharing, and Vorbis can produce smaller files than uncompressed WAV audio. An OGG audio file contains sound, not editable subtitle cues.

How to convert VTT to OGG

Online on 101convert.com

1. Upload the VTT file on the converter page. Multiple files can be added for batch conversion; the per-file size limit is shown there.
2. Before converting, choose the voice language, reading speed, and subtitle timing as needed.
3. Start the conversion, then download the resulting OGG file or files.

Offline with desktop software

For a local workflow, use eSpeak NG to synthesize speech and FFmpeg to encode the result as OGG. Both are available for Linux, macOS, and Windows.

1. Make a plain-text file named captions.txt containing the caption wording in reading order. Remove the VTT header, cue numbers, timestamps, and markup tags so they are not spoken.
2. Use eSpeak NG to create a WAV file. For English, run espeak-ng -v en -f captions.txt -w speech.wav. Change en to an available voice language.
3. Encode the WAV as Vorbis audio in an OGG container with FFmpeg: ffmpeg -i speech.wav -c:a libvorbis -q:a 5 speech.ogg.

Quality and limitations

This process synthesizes a new voice; it does not recover or convert the original speaker’s audio. The offline steps above read captions sequentially and discard their timestamps, so the narration will not retain cue timing. Voice choice and pronunciation affect intelligibility; -q:a 5 sets FFmpeg’s Vorbis quality level, which can be adjusted for file size or audio quality.