OpenSpeaks Subtitler

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What OpenSpeaks Subtitler is

OpenSpeaks Subtitler is a free web tool for creating and editing subtitles for audio and video, with particular relevance to oral history and language documentation. It can detect silence and divide speech into draft subtitle segments; users can adjust the silence threshold, minimum silence length, and end buffer. Editing tools include a waveform timeline, subtitle cards, live text over video, and segment looping, while changes are saved to the local project state in real time. Finished subtitles can be exported as UTF-8 SRT or VTT files. The tool can load media and existing subtitles from Wikimedia Commons and upload completed subtitles there as TimedText. A side-by-side panel supports translation with machine-translation assistance. Wikimedia login uses OAuth 2.0, and the tool page says it stores no separate password. Silence detection runs client-side through FFmpeg.wasm in a web worker. It is listed under the MIT license and has no paid plan or usage limits stated.

Who it suits

It is aimed at archivists, language documenters, and Wikimedians, especially those working with low-resourced languages. It may suit users preparing subtitles for Wikimedia Commons or exporting SRT and VTT files.

What it does well

Silence detection creates draft subtitle segments.
Threshold, silence length, and end buffer are adjustable.
Exports UTF-8 SRT and VTT files.
Can load and upload subtitles through Wikimedia Commons.
Free and listed under the MIT license.

What to know first

Chromium-based browsers are recommended for full feature support.
AI-powered speech-to-text is listed as a future feature.

Plans

Plan	Billed and limits	Price
Free	Free and open source; no paid plan or usage limits stated	Free

As subtitler.toolforge.org lists them, read 8 Oct 2026. The maker's own page has the final word.

Getting started

Visit https://subtitler.toolforge.org/.
Use a modern browser; Chromium-based browsers are recommended for full feature support.
Load audio or video and use silence detection to create draft segments.
Edit subtitles in the waveform and subtitle-card workspace.
Export as UTF-8 SRT or VTT, or upload finished subtitles to Wikimedia Commons as TimedText.

Verdict

OpenSpeaks Subtitler combines draft creation, editing, translation assistance, and subtitle export in a free browser-based tool. Check the browser recommendation if you need full feature support.

Questions

Does OpenSpeaks Subtitler cost anything?

It is listed as free, with no paid plan stated.

What subtitle formats can it export?

It exports UTF-8 encoded SRT and VTT files.

Can it translate subtitles?

Yes. It offers a side-by-side translation panel with machine-translation assistance.

Can it work with Wikimedia Commons?

Yes. Users can load media and existing subtitles from Wikimedia Commons and upload finished subtitles there as TimedText.

What platforms and browsers does it support?

It is a web tool. Its instructions recommend modern browsers and Chromium-based browsers for full feature support.

Is it open source?

It is listed under the MIT license.

Facts from OpenSpeaks Subtitler's own pages

Authentication: Wikimedia login uses OAuth 2.0, and the tool page says it stores no separate password. · meta.wikimedia.org, 8 Oct 2026
Browser support: The usage instructions recommend modern browsers and say Chromium-based browsers are recommended for full feature support. · meta.wikimedia.org, 8 Oct 2026
Draft generation: Silence detection can split spoken audio into draft subtitle segments, with adjustable silence threshold, minimum silence length, and end buffer. · meta.wikimedia.org, 8 Oct 2026
Editing: The editor includes a waveform timeline, editable subtitle cards, live on-video text, segment looping, and real-time saving to local project state. · meta.wikimedia.org, 8 Oct 2026
File formats: Users can export subtitles as UTF-8 encoded SRT or VTT files. · meta.wikimedia.org, 8 Oct 2026
Free plan: Yes · meta.wikimedia.org, 23 Sept 2026
Intended users: The maker describes archivists, language documenters, and Wikimedians as intended users, especially those working with low-resourced languages. · meta.wikimedia.org, 8 Oct 2026
License: The tool is listed under the MIT license. · meta.wikimedia.org, 8 Oct 2026
Local processing: The tool page identifies FFmpeg.wasm running in a web worker for client-side silence detection. · meta.wikimedia.org, 8 Oct 2026
Planned feature: The tool page lists AI-powered speech-to-text integration as a future feature. · meta.wikimedia.org, 8 Oct 2026
Purpose: OpenSpeaks Subtitler creates and edits subtitles for audio and video, particularly for oral history and language documentation. · meta.wikimedia.org, 8 Oct 2026
SRT export: Yes · meta.wikimedia.org, 23 Sept 2026
Support: Users can share feedback on the discussion page or file bugs and feature requests in the public GitLab repository. · meta.wikimedia.org, 8 Oct 2026
Translation: The maker says the tool supports a side-by-side translation panel with machine-translation assistance. · diff.wikimedia.org, 8 Oct 2026
VTT export: Yes · meta.wikimedia.org, 23 Sept 2026
Wikimedia Commons: Users can load media and existing subtitles from Wikimedia Commons and upload finished subtitles there as TimedText. · meta.wikimedia.org, 8 Oct 2026

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