AI Audio Transcription
Gemini 1.5 Flash generates word-level and phrase-level caption timings automatically. Upload audio, get precise SRT captions in seconds.
Powered by Gemini 1.5 Flash AI
Alpha Captions
Made Simple
Upload audio, let AI auto-transcribe it, style captions with 100+ premium fonts and pro motion effects, then export as a transparent overlay — ready for Premiere Pro, After Effects, or CapCut. No green screen required.
Vcaptiona — Alpha Caption
Editor
Oswald Bold
#FFFFFF
72px
Overshoot
This
is your caption
1080p
This is your
caption
with alpha channel
Compatible with
Premiere Pro
After Effects
CapCut
100+
Premium Fonts
8
Motion Effects
α
Transparent Export
0s
Green Screen Needed
AI Caption Generator
Built for Pro Editors
A focused toolkit for one purpose: creating transparent caption overlays faster than any manual workflow.
Precision Timeline Editor
Full-width interactive caption timeline with drag-and-drop repositioning and edge-resizing for frame-accurate subtitle control.
1080p Canvas Preview
See exactly how your transparent captions look on a real HD stage with real-time preview and waveform-synced playback.
100+ Premium Fonts
Curated Google Fonts library — clean sans-serifs, elegant scripts, technical mono. The right typeface for every video style and brand.
Deep Text Customization
Font size, text color, stroke color & width, vertical position, alignment, drop shadows — complete caption styling control.
Transparent WebM Export
Export caption overlays as WebM with a native alpha channel. Drop directly into your video editor — no green screen, no masking needed.
Three Steps to
Transparent Captions
From audio file to alpha channel overlay in under a minute. No manual timing, no complex masking.
Upload & Auto-Transcribe
Drop your audio file. Gemini 1.5 Flash AI transcribes it with precise word-level timings — no manual typing required.
MP3, WAV, M4A, OGG supported
Word & phrase-level timing
Multiple language support
Style & Add Effects
Choose from 100+ fonts, fine-tune every caption property, and apply professional motion effects with a single click.
Font, size, color, stroke, shadow
8 pro motion text presets
Full undo/redo history
Export & Drop Into Editor
Export a transparent WebM caption overlay. Drag it straight into your video editing timeline — it just works.
WebM with alpha channel
No green screen needed
Works in Premiere, AE, CapCut
Caption Animations
That Demand Attention
Eight professional text animation presets — from clean transitions to high-energy effects. Apply with one click.
Overshoot
Overshoot
Bouncy elastic entrance animation
Pop
Pop
Quick scale-up punch effect
Slide
Up
Slide Up
Smooth upward reveal from below
Fade
Fade
Clean fade-in with subtle blur
D3c0d3
Decode
Matrix-style flickering text reveal
Typewriter
Typewriter
Character-by-character typing effect
Wiggle
Wiggle
Playful jitter animation for fun content
Turbulent
Turbulent
High-energy chaotic jitter effect
No Green Screen.
No Masking.
Just Drop It In.
Vcaptiona records the canvas and exports a WebM video with a built-in alpha channel. The background is truly transparent — not green, not black, not a chroma key approximation. Your caption overlays work everywhere.
Transparent WebM Format
True alpha transparency, not simulated or
approximated
Drag & Drop Import
Place the exported file directly on your
editor timeline
Animations Baked In
Motion effects are rendered into the export —
no plugins needed
caption_overlay_alpha.webm
Your
caption here
ALPHA
.webm
Premiere Pro
After Effects
CapCut
Frequently Asked
Questions
An alpha caption overlay is a video file with a transparent background (alpha channel) containing animated text captions. It can be placed directly on top of your video footage in editors like Premiere Pro, After Effects, or CapCut — without needing green screen removal, chroma keying, or complex masking.
Yes. Vcaptiona exports transparent WebM files with a built-in alpha channel that can be imported directly into Adobe Premiere Pro, After Effects, CapCut, DaVinci Resolve, and any editor that supports WebM with transparency. No plugins or extensions required.
Vcaptiona uses Google's Gemini 1.5 Flash model to automatically transcribe your uploaded audio files. It generates both word-level and phrase-level timestamps, significantly reducing the manual work of timing your captions compared to traditional SRT workflows.
No. Vcaptiona renders captions on a transparent canvas and exports them as WebM files with a native alpha channel. There is no green screen, no chroma keying, and no masking required. The transparency is real and built into the file format.
Vcaptiona is currently free during early access. No credit card is required to sign up. Join the waitlist to get immediate access when your spot opens.
Vcaptiona supports MP3, WAV, M4A, and OGG audio formats. Simply upload your audio file and the AI handles the rest — transcription, timing, and caption generation.
Additional User Experience Features
Full Undo/Redo System
Experiment with confidence. Every caption design change is tracked — go back to any point in your editing history.
Responsive Design
Built with Tailwind CSS. A polished, modern caption editor interface that works seamlessly across desktop, tablet, and mobile.
Waveform Visualization
Integrated wavesurfer.js for visual audio editing. Click anywhere on the waveform to seek precisely through your audio.
Stop Building
Captions By Hand.
Join thousands of video editors using Vcaptiona to create professional transparent caption overlays in seconds — not hours.
Free during early access. No credit card required. Unsubscribe anytime.