OpenSubs

Spec sheet

Purpose

OpenSubs transcribes, translates, styles and burns subtitles into video, with video processing running in the browser.Read 11 Oct 2026 · opensubs.app

Free plan

YesRead 22 Sep 2026 · opensubs.app

Integrations

The site names Claude, OpenAI and DeepL as providers usable with a user’s own API key; keys are sent directly from the browser to the selected provider.Read 11 Oct 2026 · opensubs.app

Privacy

The site says it has no video upload endpoint; subtitle text or trimmed audio can leave the device only when the user selects a cloud option.Read 11 Oct 2026 · opensubs.app

Support

The site lists [email protected] for contact and problem reports.Read 11 Oct 2026 · opensubs.app

API key handling

User-provided API keys are held in page memory and are not stored or sent to OpenSubs, according to the site.Read 11 Oct 2026 · opensubs.app

Brand caption presets

NoRead 22 Sep 2026 · opensubs.app

Browser extension

A free extension generates subtitles over video playing in a tab in Chrome, Edge and Firefox.Read 11 Oct 2026 · opensubs.app

Burn-in captions

YesRead 22 Sep 2026 · opensubs.app

Caption languages

20Read 22 Sep 2026 · opensubs.app

Caption styling

YesRead 22 Sep 2026 · opensubs.app

Desktop and CLI

Free desktop builds are offered for macOS, Windows and Linux; the command-line tool is built from source, and both require ffmpeg with the ASS filter for burning.Read 11 Oct 2026 · opensubs.app

Editing limit

Cue text can be edited, but cue timings cannot be changed and cues cannot be added, deleted or merged.Read 11 Oct 2026 · opensubs.app

Offline use

After initial downloads, the site says it works largely offline except for cloud translation.Read 11 Oct 2026 · opensubs.app

Release status

The site identifies current builds as release candidates and says desktop builds are unsigned.Read 11 Oct 2026 · opensubs.app

Styling and export

OpenSubs offers 12 subtitle styles, word-by-word highlighting, MP4 burn-in and SRT, VTT and ASS export.Read 11 Oct 2026 · opensubs.app

Subtitle export

other formatsRead 22 Sep 2026 · opensubs.app

Transcription

It runs Whisper locally using WebGPU when available or WebAssembly otherwise, with Tiny, Base and Small models.Read 11 Oct 2026 · opensubs.app

Translation

It supports translation into 20 languages, using Chrome’s built-in on-device translation, user-provided provider keys or paid cloud credits.Read 11 Oct 2026 · opensubs.app

Video formats

The browser app accepts MP4, MOV, WebM and MKV videos.Read 11 Oct 2026 · opensubs.app

Plans and prices

Every OpenSubs plan and price →

Where Specifiction places it

• AI Video Caption Generators#23 of 998.6