Podstr — AI Subtitle Translation

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 on YouTube, BBC iPlayer, ARTE, Plex, Filmzie or other sites A language picker appears above the video — choose your language Subtitles appear over the video while you watch

SUPPORTED PLATFORMS • YouTube — manual CC subtitles (auto-generated ASR are filtered out) • BBC iPlayer — BBC series and documentaries • ARTE, Filmzie — HLS subtitle streams • Plex — media streaming with subtitles • Any site with HLS video and .vtt/.ttml subtitles — enable per site in popup

FEATURES • 30 translation languages — Arabic, Chinese, Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian, Polish, Portuguese, Romanian, Russian, Spanish, Swedish, Thai, Turkish, Ukrainian, Vietnamese and more • Multiple AI models — choose by quality and price. Free models available • Translation cost — see how much each translation costs right on the video • Slow model warning — picker warns if the selected model may be slow • Smart cache — translated subtitles are saved locally and load instantly on repeat viewing • Shared cache — if someone already translated an episode, you get it for free • Progress bar — watch the video while translation runs in background • Keyboard shortcut (B) — toggle subtitles on/off • Subtitle styling — adjust size, color, background, position • Works offline after first translation — cached subtitles need no internet

YOUR API KEY, YOUR CONTROL Podstr uses the OpenRouter API. You bring your own API key — it stays on your device, never leaves your browser. Typical cost: $0.005–0.05 per episode depending on the model.