I work on OpenSubs, a free, open source (AGPL-3.0) subtitle tool that runs entirely in the browser tab.
You drop in a video file, and Whisper transcribes it on your own machine, using transformers.js with WebGPU where available and WebAssembly otherwise. The model (40–250 MB) downloads once and is cached. There is no upload endpoint in the product, so the video has nowhere to go.
After that you can:
- fix lines by typing over them (click a timestamp to jump to that moment)
- translate into 20 languages with Chrome’s built-in on-device translator
- pick one of 12 caption styles, including word-by-word highlighting
- export SRT / VTT / ASS, or burn the subtitles into an MP4 (libass compiled to WebAssembly, encoded with WebCodecs)
A few things I learned building it:
- Whisper hallucinates on silence and music (“Thanks for watching!”, or the Japanese equivalent). A Silero VAD pass runs before Whisper, and a cleanup step drops the known stock phrases.
- Singing doesn’t count as speech for the VAD, so a music video gets a “no speech found” warning. You can still force it.
Honest limits: it only takes video files, not audio-only files. Cue timings can’t be edited yet. Builds are release candidates. Everything that runs locally is free with no account; the only paid part is optional cloud translation on our backend (US$5 for 1000 credits), and you can bring your own Claude / OpenAI / DeepL key instead.
Site: https://opensubs.app/ Code: https://github.com/open-subs/opensubs
Feedback welcome, especially on languages where the transcription goes wrong.
I just made an open-shoe! This is the first FOSS shoe ever. Everything is free but if you want both shoes, you’ll need a subscription. OpenShoe is right foot only. Any foot, any size, durable and incredibly versatile. Left shoe only available in sizes M5, M7, M11.5, and M16.
Most videos I watch are in English, Spanish or German, I don’t need an translation for it, less one by AI.
Nice, another blindly generated app by Claude Code. 37 commits and already announcing it tells it all.
yep, I would rather generate one with Claude to my liking and make it more efficient (target the CLI for example)
Which is absolutely legit. I only criticize the people releasing a “production ready” product, which is nothing but a PoC and then also claim that it is AGPL-3, while abandoning it after 2 months. This hurts the open source community imho.
This hurts the open source community imho.
Nah. At worst the open source community is indifferent. If someone can pick up where this left off then it benefits the community.
It sounds like a pretty cool project, thanks for sharing! As a browser-based project designed to run offline, you might want to consider shipping it as an electron app.
tauri is better and more efficient for this.
Why not just use the whisper plugin for Bazarr?
i get ya, but also a lot of people don’t have a dedicated self hosted setup. recently my hdd died and all my films were there, so now i’m downloading and deleting, which just feels like a drag to start bazarr for one film. this is handy for some people.
What’s the max file size?
I’ve been looking for the fan edit of marvels Infinity saga.
It’s about 50 hours long divided into many many files ranging from 3-10 gb each. Would it be able to handle this? Or what’s the best way to split them up
I’m a lazy reader so don’t know if this is implemented but it would be cool if it could be done live with the current audio out of the system. I know this was done for streamers etc using OBS/localvocal but it’s a pain to get working in my experience - having to fiddle around with OBS filter settings.
