Podstr — AI Subtitle Translation

No subtitles in your language? The extension translates them in real time — with context, not line by line.

Podstr translates video subtitles to any language using AI models - Claude, Gemini, DeepSeek and others. Works directly in your browser, no server needed, no account required. HOW IT WORKS Install the extension Open a video with subtitles in your browser A language picker appears above the video - choose your language Subtitles appear over the video while you watch WHERE IT WORKS Podstr works with video players that expose subtitle tracks in standard formats: HLS streams with .vtt segments, TTML, .srt files and native HTML5 subtitle tracks. We don't guarantee any specific site. Streaming sites update their players, formats and APIs often, and something that worked last month may stop working tomorrow. We try to keep up. If Podstr doesn't work on a player you'd like to use - or stops working somewhere it used to - email us at hello@podstr.cc. FEATURES Translation: 30 target languages Multiple AI models - free models available, paid models from ~$0.005 per episode Translation cost shown after each translation Auto-retry for lines the model skipped Cache: Local cache - translated subtitles load instantly on repeat viewing Shared cache - if someone already translated an episode, you get it free Works offline after first translation While watching: Progress bar while translation runs in background Keyboard shortcut (B) - toggle subtitles on/off Adjust size, color, background, position YOUR API KEY, YOUR CONTROL Podstr uses the OpenRouter API. You bring your own key - it stays on your device, never leaves your browser. Typical cost: $0.005-0.05 per episode depending on the model. Get a free API key at openrouter.ai/keys PRIVACY API key stored locally - never synced or sent to any server No tracking, no analytics, no ads Subtitle text sent only to the AI provider you choose Open source: github.com/aveleazer/podstr PERMISSIONS "Read and change all your data on all websites" - needed to read subtitle streams from video CDNs and show the overlay "activeTab" - needed to detect the current page and activate the picker 13 interface languages: English, Russian, Ukrainian, Belarusian, Serbian, Spanish, French, German, Portuguese, Chinese, Japanese, Korean, Turkish. Tears of Steel (CC) Blender Foundation | mango.blender.org, CC BY 3.0. Subtitles machine-translated by Podstr. Website: podstr.cc Support: hello@podstr.cc