AI subtitles
AI subtitles for language learning: turn a video without captions into study material
The video you want to learn from has no subtitles, or the captions are wrong, incomplete, or in the wrong language. LangScribe generates time-coded subtitles from the audio, so you can translate them, replay each line, and look up words in context.
Video files play on your device. They are never uploaded for playback. When you run AI subtitles, the browser extracts audio and sends it in short chunks for speech-to-text, not the whole film as a cloud upload.
Free to start with imported subtitles. AI transcription uses credits. Sign in only when you need AI.
When just watching is not enough
Streaming captions and auto-subs are built for watching, not for deliberate listening practice. If the line you need is missing, mistimed, or only in one language, you cannot study it on purpose.
- Jump to the previous or next sentence with confidence
- Loop a hard stretch until every word is clear
- Click a word and keep it tied to the original line
From audio to lines you can study
Open a local file in the browser, or paste a direct video link. Playback stays on your device. Speech recognition covers many languages; pick the spoken language when you start a job if needed.
- Transcribe into timed subtitles. AI writes time-coded sentences aligned to the timeline, ready for line-by-line study. Export as SRT when you want a file you can edit.
- Translate for bilingual study. Free translation covers everyday bilingual display. AI translation uses credits when you want more context-aware wording. Original and translation sit one above the other.
- Study line by line. Replay the current line, set an A-B loop, click words for meaning, and save them to your vocabulary list.
Study-ready subtitles, not just a line of text
A learning player needs cues with timestamps. Once lines are timed, LangScribe can move between them, loop them, and keep lookups attached to the sentence. That is different from dumping a raw transcript into a notes app.
- Move to the previous or next line with one action
- Replay or loop a single sentence
- Mark A and B for any hard segment
- Show bilingual subtitles without leaving the player
Batch jobs and recordings
Import several videos and run transcription and translation in one queue. The same speech-to-text path also turns recordings into timed text you can translate and study. Open the player or the transcript when a job finishes.
Open the subtitle production queueWhen to use AI, and when to import
Pick the path that matches the file you already have.
| Situation | Better path |
|---|---|
| You already have official or community SRT, VTT, or ASS | Import first. Free study path, no AI credits. |
| No captions, broken timing, or an unusable language | AI subtitles, then translate and study. |
| You care about proper nouns or dense jargon | Generate, then edit the SRT before heavy study. |
AI can mishear accents, names, and noisy audio. Export, correct what matters, and keep studying in the player. Do not treat every cue as final on important material.
Prefer free? Import SRT for bilingual studyCredits, stated plainly
AI subtitles are billed by audio length: 2 credits per minute. Playback, imported subtitles, and free translation cost nothing. Sign in with Google only when you use AI features or want library sync.
| Video length | AI subtitles | AI translation, typical |
|---|---|---|
| 10 min | 20 credits | 15 to 20 credits |
| 30 min | 60 credits | 45 to 60 credits |
| 60 min | 120 credits | 90 to 120 credits |
Privacy boundary on this page
- Playback: video files are not uploaded.
- AI subtitles: only extracted audio chunks are sent for transcription.
- Guest use: import subtitles and study without an account. AI needs sign-in and credits.
- This page is not a Netflix or streaming-site extension. If the file is on disk or a direct link, LangScribe fits.
FAQ
Are AI subtitles free?
No. AI subtitles and AI translation use credits. Importing SRT, VTT, or ASS, and free translation, do not use AI credits. Playback and line loops work without paying.
Does LangScribe upload the whole video?
No. Files play on your device. For AI subtitles, the browser extracts audio and sends short chunks for transcription, not a full-film upload.
How accurate is the transcription?
It depends on language, accent, noise, and speaking speed. Export SRT, fix errors, and keep using the learning player. Treat AI as a fast first draft of cues.
Can I use this without signing up?
Yes for playback, imported subtitles, free translation, loops, and word lookup. AI subtitles need Google sign-in and credits.
What formats work?
Common browser-playable video and audio, such as MP4, WebM, and MP3. Subtitles import as SRT, VTT, or ASS, and export as SRT.
Turn the next uncaptioned video into lines you can loop
Import a file, generate timed AI subtitles, translate what you need, then practice sentence by sentence, without uploading the film for playback.
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