Captions that make people stop scrolling.
Auto-transcribe your short, pick a style, and export a burned-in MP4. Everything runs in your browser, so your footage never uploads and there are no limits.
No signup. No upload. Works in Chrome and Edge.
From clip to captioned in three steps
Drop in your clip
9:16, 16:9, any short. It stays on your device.
Auto-caption and style
Whisper transcribes on your machine. Fix a word, pick a style, tweak color, size, and position.
Export a burned-in MP4
Rendered locally with WebCodecs. Post it anywhere.
One engine, a growing library of styles
Every style is a self-contained preset. New ones ship continuously, no rebuild needed.
Private by design. Fast by default.
CapStudio is built so the heavy work happens in your browser. That is not just a privacy promise, it is why there are no upload waits and no limits.
Your footage never leaves your device
Transcription and export run locally. We never see or store your video.
No render queue, no upload wait
Processing happens on your machine, so there is nothing to wait in line for.
No per-video limits
Caption as many clips as you want. There is no metered cost on our side.
Works after the first load
The model caches in your browser, so repeat sessions start fast.
Finally, captions that get Czech right.
English-first tools butcher diacritics and split words in the wrong places. CapStudio tunes transcription and caption layout for Czech, Polish, Slovak and other Slavic languages, so háčky, čárky and word timing land where they should.
Free forever, or go Pro
Start free with no signup. Upgrade when you want the watermark gone.
Free
$0 forever
- +Auto-transcription (base model)
- +Karaoke Highlight + Clean Lower-Third styles
- +Up to 2 saved projects
- +Export with a small watermark
Pro
$59/yrsave 45%
or $9/mo - 7-day free trial, no card.
- +No watermark on exports
- +Every caption style
- +Larger, more accurate model (better Czech)
- +Brand kit + cloud sync across devices
Questions
Is it really free?
Yes. The free tier is permanent. Exports carry a small CapStudio watermark, which Pro removes.
Does my video get uploaded?
No. Transcription and export run entirely in your browser. Your footage never leaves your device.
Which browsers work?
Chrome and Edge are best (WebGPU acceleration). Firefox works but is slower, and there is no mobile support yet.
What languages does it support?
Many, with special tuning for Czech and other Slavic languages where most tools struggle.
What is the watermark?
A small CapStudio mark in the corner of free exports. Upgrading to Pro removes it.
Make your next short impossible to scroll past.
No signup. Your video stays on your machine.