Upload your video, get accurate captions in minutes, fine-tune in our built-in editor, and export as SRT, VTT, or burned-in MP4. Used by 10,000+ creators, media teams, and educators.
No credit card required
Free auto-caption tools get the words roughly right. Fluen gets the punctuation, segmentation, and formatting right too.
Drag-and-drop any video or audio format. Fluen auto-detects the language and starts transcribing immediately. Supports MP4, MOV, MKV, AVI, MP3, WAV, and more.
Captions are synced to your media and ready to review. AI handles punctuation, speaker changes, and line breaks. Make quick edits if needed. Most files need barely any.
Download as SRT, WebVTT, or burned-in MP4 with custom subtitle styling. Need subtitles in other languages? Translate into 50+ languages right from the export step.
Fluen's context-aware AI translation doesn't just swap words. It re-segments every cue for the target language, respecting character-per-line limits and natural reading flow. The result: subtitles that look like they were written by a native speaker.
We route your file to the best speech engine for your content type, language, and audio quality.
Captions are split at natural sentence boundaries with proper character-per-line limits for readability.
Detects speaker changes in interviews, podcasts, and multi-person recordings automatically.
Define how technical terms, brand names, and jargon should appear in your captions.
Full control over font, color, backing plate, and positioning. Generate burned-in MP4s ready to upload anywhere.
Upload multiple files at once. Queue them up and let Fluen process your entire content library.
Boost discoverability and watch time with accurate captions. YouTube rewards accessible content in search and recommendations.
Turn episodes into searchable transcripts and captioned video clips. Repurpose audio content for social media and YouTube.
Make courses accessible and compliant. Subtitles improve retention and help non-native speakers follow along with your content.
Caption client videos at scale. Deliver professional subtitle files in any format, for any platform, in minutes.
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 or WebVTT 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 99.2% accuracy by routing your file to the best speech-to-text engine for your content type, language, and audio quality. 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. If you already have subtitle files, you can import SRT files directly during the caption review step.
Yes. Fluen can generate a burned-in MP4 with your subtitles embedded directly into the video. You have full control over font, size, color, position, and background opacity, so your captions look exactly how you want them.
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 →
Most files are processed in minutes. A 60-minute video typically takes 3–5 minutes to transcribe. Processing time depends on file length, audio quality, and the AI engine selected. You'll be notified as soon as your captions are ready for review.
Yes. Fluen includes speaker diarization that detects when a new person starts speaking. A dash is prepended to the beginning of the cue to visually indicate the speaker change. This is especially useful for interviews, podcasts, and panel discussions.
Yes. You can sign up and process your first 3 files completely free, no credit card required. This gives you access to the AI captioning engines and the built-in editor so you can evaluate the quality before committing to a plan. See pricing →
Upload your first file free. No credit card. No commitment. Just professional captions in minutes.
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