Captions so accurate you barely need to edit. Proper punctuation, natural line breaks, 50+ languages. Export as SRT, VTT, TTML, and more.
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We use five leading speech engines, chosen per language, and the best of the latest frontier AI models for translation. Our own segmentation technology turns the raw output into natural, well-timed subtitles ready for the screen.
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“YouTube or Zoom already auto-caption my videos.”
They do, but without punctuation, capitalization, or line breaks. Your viewers notice. Upload to Fluen, get broadcast-quality captions, and export a clean SRT or burned-in MP4 in minutes.
“I'll just fix the auto-captions manually.”
A 30-minute video has ~400 subtitles. At 99.4% accuracy with smart segmentation, Fluen handles the punctuation, line breaks, and speaker labels for you. Most files need barely any edits.
“Sounds great, but I have hundreds of videos.”
Upload up to 50 files at a time on paid plans, or import them from Google Drive or Dropbox. Fluen processes them in parallel, so you can work through an entire content library and download clean SRTs for all of them at once. Start with 3 free files to see the quality for yourself.
Fluen regularly benchmarks five leading speech engines (ElevenLabs, Speechmatics, Deepgram, AssemblyAI and OpenAI) and sends each language to the one that handles it best. The result is consistently higher accuracy than any single engine can deliver on its own.
See how engine routing worksReview captions synced to your video. Adjust timing to the millisecond, fix a word, split a subtitle, or jump straight to lines that are too long or too fast to read. Everything runs in your browser, so there's nothing to download or install. Working in Premiere Pro? The Fluen plugin brings captions and translations into your timeline.
Explore the subtitle editorChoose from 30+ caption styles, including dynamic word-by-word captions, or fine-tune font, color, size, and position. Preview it live, then export burned-in MP4s up to 4K, ready for YouTube, Instagram, or any platform.
See dynamic captionsDefine how technical terms, brand names, and industry jargon should appear in your captions. Your glossary ensures Kubernetes stays "Kubernetes" and not "Cooper Netties." Once saved, it applies automatically to every future upload.
See the glossary in actionUpload up to 50 files at a time on paid plans, or import them from Google Drive or Dropbox. Files process in parallel, and you can download subtitle files for all of them at once. Connect Zapier or our API to automate the rest.
Automate via the APIOnce your captions are ready, translate them into 50+ languages with a single click. Fluen's context-aware AI doesn't just swap words: it re-segments every subtitle for the target language, respecting character-per-line limits and natural reading flow. The result: subtitles that read like they were written by a native speaker.
Upload your video to Fluen, and our AI generates accurate captions automatically. Review and edit them in our built-in subtitle editor, then export as SRT, WebVTT, TTML, and more to upload to YouTube, Vimeo, or any platform. You can also choose burned-in MP4 to have the subtitles embedded directly into your video file.
Fluen achieves up to 99.4% accuracy. We regularly benchmark five leading speech engines and route each language to the one that handles it best. Combined with our smart segmentation, captions come out well-punctuated, properly capitalized, and split at natural sentence boundaries.
Fluen supports all major video formats including MP4, MOV, MKV, and AVI, as well as audio formats like MP3, WAV, M4A, and FLAC. You can upload from your computer or import from Google Drive or Dropbox. Already have subtitles? On paid plans you can import your own SRT files during caption review, or in bulk for many videos at once. A source video is still required.
Yes. On paid plans, Fluen generates a burned-in MP4 (720p, 1080p, or 4K) with your subtitles embedded directly into the video. Pick one of 30+ caption styles, including dynamic word-by-word captions, or fine-tune font, size, color, position, and background, and the export matches what you see in the editor.
Absolutely. Once you've generated and reviewed your captions, you can translate them into 50+ languages with Fluen's AI translation engine. Translations are context-aware and automatically re-segmented for each target language. Learn more about subtitle translation →
Yes. Fluen works with any aspect ratio, including vertical 9:16 videos from TikTok, Instagram Reels, and YouTube Shorts. Captioning and burned-in export both handle portrait orientation automatically, so your subtitles are always positioned correctly.
Yes. The free plan lets you caption and translate 3 files (up to 90 minutes each) and review the results in the editor, no credit card required. Downloading subtitles, exporting video and importing your own SRT files require a paid plan. See pricing →
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