AI Captions & Narration
Your words become subtitles. Then voiceover.
Generate accurate captions from microphone audio, rewrite the script, and turn caption text into friendly narration voices — all inside the editor.
STT · TTS · LOCAL
Introducing OneshotFX · Free Chrome extension
Recordings, reimagined.
Hit record. OneshotFX adds cinematic zoom, beautiful backgrounds, and click effects automatically — entirely on your device.
No account · 100% offline · MP4 & WebM export
New · AI in OneshotFX
It captions.
It narrates.
You ship.
00:04 · Caption
On-device
“Here's the faster way to record your next product demo.”
Hear it with AI narration
Voice · Ava
AI-powered, studio-quality
Captions, narration, and pro effects. Already added.
Cinematic Auto-Zoom
Focus follows the cursor. Automatically.
OneshotFX tracks every move and click, then generates buttery-smooth zoom and pan animations frame by frame. No keyframes. No fiddling. Just effortless attention.
2.0× ZOOM
Click Animations
Every tap, beautifully telegraphed.
Five tasteful styles — ring, ripple, spotlight, pulse, and wave — render in real time on every click, so viewers always know exactly where to look.
5 STYLES
Studio Backgrounds
Your desktop, dressed for the part.
Drop in a gorgeous gradient or a custom wallpaper. Your recording floats in a polished frame with depth, padding, and a subtle reflection — like it was edited in post.
GRADIENT · IMAGE
Capture
Screen, audio, and webcam — all at once.
Capture your monitor at native resolution, mix system audio with your microphone, and add a picture-in-picture webcam. Everything composited locally, in real time.
MIC · SYSTEM · CAM
AI tools for makers
More than a recorder. A private AI editor.
Automatic captions
Transcribe mic audio into natural caption blocks with word-level timing and cleaner pacing.
AI narration voices
Turn edited captions into friendly voiceover and replace rough mic takes while keeping system audio.
Webcam overlay
A picture-in-picture bubble that auto-shrinks as you zoom, then grows back out.
Hardware-accelerated export
WebCodecs-powered. Captions, narration, effects, and audio mix export on-device in seconds.
Crop & aspect ratio
16:9, 1:1, 9:16, 4:5 — export for any platform without re-recording.
Trim & skip
Non-destructive cut markers clean up the pacing before captions and narration are exported.
Record · Generate · Polish · Export
An AI production pipeline. All on your machine.
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Step 01
Install
One click in the Chrome Web Store. No sign-up, no email.
chrome://extensions → OneshotFX ✓ -
Step 02
Record
Capture screen, system audio, microphone, and webcam in one shot.
● REC Screen + Mic + Cam -
Step 03
Generate AI
Create timed captions from speech, then generate narration from text.
STT → captions · TTS → voice -
Step 04
Polish & export
Add zooms, backgrounds, and click effects. Export MP4 or WebM locally.
✓ narrated_demo.mp4 saved
Questions, answered
Frequently asked.
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What is OneshotFX?
OneshotFX is a Chrome extension that automates the creation of professional screen recordings. It can generate AI captions and narration, then add cinematic zoom, animated backgrounds, and click effects automatically — so you spend less time editing. -
Can OneshotFX generate captions and voiceover?
Yes. OneshotFX can transcribe your microphone audio into timed captions, then generate text-to-speech narration from caption text using friendly voices like Miles and Ava. -
Is my data private? Does anything upload to the cloud?
Nothing leaves your device. OneshotFX uses 100% offline processing — recordings, transcripts, generated narration, audio, and webcam feed are processed locally in your browser. -
Is OneshotFX free to use?
Yes. OneshotFX is currently in public beta and is free to download and use. No account, no subscription, no usage limits. -
What video formats can I export?
You can export to MP4 (H.264) or WebM (VP9). Both formats are ready to upload to YouTube, LinkedIn, X, or drop into product documentation. -
Does it work on Mac and Windows?
Yes. Because OneshotFX is a Chrome extension, it works on any desktop OS that runs Chrome — macOS, Windows, Linux, and ChromeOS. -
Do I need to know how to edit video?
Not at all. OneshotFX is built for developers, founders, PMs, educators, and support teams who want polished AI-enhanced demos without the learning curve. Hit record — the editor handles the rest.
Free during beta · Private AI · No sign-up · Works offline
Record once. Let AI finish it.
Install in seconds. Capture your workflow. Walk away with captions, narration, zooms, backgrounds, and export-ready audio — without sending your recording to the cloud.