The AI auto caption generator that never uploads your video
Generate animated, word-by-word subtitles for Instagram Reels, YouTube Shorts and TikTok in seconds. Built for Hindi, Hinglish and 15+ Indian languages — and captions are rendered and exported inside your browser, so your footage stays on your own machine.
What is an auto caption generator?
From raw clip to captioned reel in four steps
No timeline scrubbing, no cloud render queue, no waiting for an email to say your export is ready.
- STEP 01
Drop in your video
MP4, MOV, WebM, MKV, M4V, AVI or 3GP. The file is decoded on your own device, and the video itself is never uploaded.
- STEP 02
Captions generate automatically
Only the extracted audio is transcribed, with a timestamp on every individual word, so captions land in sync instead of drifting a line at a time.
- STEP 03
Pick a style and fix anything
Choose from 40+ animated templates, then correct any word's spelling, timing, colour or line break against a visual waveform.
- STEP 04
Export on your own GPU
Encode a 1080p or 4K MP4 locally with WebCodecs, or download a .srt subtitle file for another editor. No render queue.
Want the detail behind each step? Read how CutXflow works or browse the step-by-step guides.
CutXflow vs cloud-upload caption tools
Some caption tools upload your video and render it on a server. CutXflow renders in your browser instead. The trade-offs run both ways, so both are listed.
| Attribute | CutXflow | Cloud-upload tool (renders on a server) |
|---|---|---|
| Is the video file uploaded? | Strength: No. It is decoded on your device; only the extracted audio, typically a few hundred kilobytes, is sent for transcription. | Yes. The whole file goes to the provider, because a server has to render it. |
| Where captions are rendered | Trade-off: In your browser, on your own GPU (WebCodecs), so export speed depends on your device. | On the provider's servers. |
| Render queue | Strength: None for export. Transcription is still a server call. | A server-side render job, so the wait depends on the provider's load. |
| Hindi and Hinglish text | Strength: Every caption font falls back to Noto Sans Devanagari. Hindi audio can be written in Devanagari or in the Latin alphabet (Hinglish). | Depends on the tool. Check that it renders Devanagari before you commit. |
| Word-level editing | Strength: Text, timing, colour and line break for every word, against a waveform. | Depends on the tool. |
| Browser needed to export | Trade-off: A recent Chrome or Edge on desktop, because export uses WebCodecs. Safari and Firefox do not currently ship it. | Not tied to a browser feature, because the server does the encoding. |
| Longest clip | Trade-off: About 17 minutes per clip. | Set by each provider. |
The right-hand column describes a category, tools that upload the video and render it on a server, and no specific product. Where it says “depends on the tool”, tools differ, so check the one you are considering.
When is CutXflow not a good fit?
CutXflow is built for short-form video captions. It is the wrong choice if:
- You need to export video from Safari, Firefox or a phone. Export runs on WebCodecs in desktop Chrome or Edge.
- Your clips run longer than about 17 minutes. Transcription currently handles up to that per clip.
- You want server-side batch processing for a team. Rendering is deliberately local, so there is no cloud job to queue up.
Auto captions in the languages you actually speak
Hindi speech often has English words mixed in, and most display fonts used in reels have no Devanagari glyphs at all. CutXflow transcribes the mix and falls back to Noto Sans Devanagari, so Hindi text renders instead of appearing as empty boxes.
Hindi in Devanagari
क्या कर रहे हो
Hinglish, in the Latin alphabet
kya kar rahe ho
Plus Hinglish in the Latin alphabet, a wide set of world languages, and automatic detection when you are not sure. See the full list.
Auto caption generator questions
What is an auto caption generator?
An auto caption generator listens to the speech in a video and writes the subtitles for you, instead of you typing and timing every line by hand. CutXflow goes a step further and timestamps every individual word, which is what lets captions animate in sync with the speaker rather than appearing a whole line at a time.
Is CutXflow's auto caption generator free?
Yes, it is free to start. A free account (Google or email sign-in) includes monthly transcription time, editing is free, and your first export is free with a small watermark; after that, exports on the free plan are ₹7 each, or any paid plan removes the watermark entirely from ₹99 per month.
Does my video get uploaded anywhere?
No. CutXflow extracts the audio track on your own device and sends only that — typically a few hundred kilobytes — for transcription. CutXflow does not save the audio, and its transcription provider handles it under its own privacy policy. Caption rendering and video export also run entirely in your browser. We never receive your video file.
Which languages does it caption?
15 Indian languages including Hindi, Bengali, Tamil, Telugu, Marathi, Gujarati, Kannada, Malayalam, Punjabi, Odia, Assamese and Urdu, plus Hinglish written in the Latin alphabet, a wide set of world languages, and automatic language detection.
Can it caption Hinglish and mixed Hindi-English speech?
Yes — this is what CutXflow is built for. Transcription is tuned for code-mixed Hinglish, and you choose whether the output is written in Devanagari or in the Latin alphabet. Every caption font falls back to Noto Sans Devanagari, so Hindi text renders correctly even in display fonts that carry no Devanagari glyphs of their own.
Can I download an SRT file instead of a captioned video?
Yes. Alongside the MP4 export you can download a SubRip (.srt) subtitle file and use it in Premiere Pro, Final Cut, DaVinci Resolve, YouTube, or anywhere else that accepts subtitles.
What do I need to run it?
A recent Chrome or Edge on desktop, because export uses WebCodecs. 4K export is desktop-only because of the memory it needs. Videos can be up to 17 minutes.
Caption your next reel in under a minute
Free to start with a free account, and your video never leaves your browser.
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