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Vaanex AIStudio
#1 Caption Tool
4.9 — Loved by 50K+ creators
100% Private — Files never leave your device

Create Viral Captions In Seconds.

AI-powered word-by-word captions with 12+ viral style presets. No watermarks. No signup. 100% browser-based.

Ready in secondsZero watermarks12+ viral studio presetsBlazing-fast processing
Spoken Language:

Tap to choose or drop your video

Browse files on your device

Supports MP4, WebM, MOV, MKV, AVI•Max 500MB
We enhance your creativity - built exclusively for creators.

Trusted by creators worldwide

Works withPremiere ProFinal CutDaVinciCapCut
Streamlined Workflow

From Raw Audio to Viral Captions in 3 Steps

No complicated timeline setup, no subscription fees, and a streamlined workflow that gets you viral captions fast.

01

Import Media

Drag and drop your video or voiceover audio. English audio is transcribed privately on your device, while other languages use our secure cloud AI for lightning-fast results.

02

Style & Fine-Tune

Choose from 12 viral caption presets. Click any word in the transcript to edit spelling, adjust timing, or re-segment lines.

03

Export & Key In Seconds

Download a CFR green screen MP4, standard SRT subtitles, or word JSON. Drop it right onto your timeline in CapCut or Premiere.

Export Deliverables

Everything You Need for Any Pipeline

Whether you edit in CapCut, color grade in DaVinci Resolve, or programmatically animate in code.

Primary Format

Green Screen Video (MP4)

A constant frame rate (CFR) video with your animated captions on a clean green or blue background.

  • Place on video track V2 directly above footage
  • Key out in 1-click using CapCut Cutout or Premiere Ultra Key
  • Preserves exact word pops, karaoke fills, and font styling
  • Constant Frame Rate ensures zero sync drift across entire video
Universal Format

Standard Subtitles (SRT)

Industry-standard SubRip `.srt` subtitle file ready for video platforms and editors.

  • Direct upload to YouTube, Instagram, TikTok, and LinkedIn
  • Works with native caption tracks in DaVinci, Premiere, and FCP
  • Clean millisecond timestamps with sequential numbering
  • UTF-8 encoded with zero BOM character issues
Developer & Motion Design

Word-Level Data (JSON)

Machine-readable JSON schema with start and end timestamps down to the millisecond for each word.

  • Includes start, end, and duration for every spoken token
  • Directly importable into After Effects or Remotion scripts
  • Flags low-confidence words and estimated timing tokens
  • Open JSON specification for custom automation workflows
Universal Compatibility

Works with Every Video Editor

Drop your green screen caption MP4 on a track above your footage. Simple 1-click chroma keying.

Desktop & Mobile
CapCut
Use the Cutout → Chroma Key tool with the eyedropper for instant viral captions.
Video → Cutout → Chroma Key
Professional
Adobe Premiere Pro
Apply the Ultra Key effect to track V2 for clean matte generation with zero color spill.
Effects → Keying → Ultra Key
Free & Studio
DaVinci Resolve
Use the 3D Qualifier on the Color page or Delta Keyer in Fusion for crisp text edges.
Color Page → 3D Qualifier
macOS
Final Cut Pro
Drag the Keyer effect directly onto your caption clip for automatic green removal.
Effects Browser → Keying → Keyer
Best Practices

Tips for 100% Accurate Sync

A few simple guidelines to get flawless captions every time without manual adjustments.

Transcribe Voiceover Before Adding Music

For highest AI accuracy, upload your isolated vocal track before mixing in loud music or background SFX.

Maintain Consistent Pacing

Natural pauses between sentences help the voice activity detector split cues cleanly without clipping words.

Use the Built-In Transcript Editor

Click any word to fix brand names or acronyms. The preview updates instantly with frame-level sync.

Export From Your Final Cut

Caption sync is locked to your project duration. Always generate captions once your video edit is locked.

Trimming in Video Editors

If you trim or cut portions of your footage in CapCut or Premiere, re-export captions to maintain frame alignment.

Got Questions?

Frequently Asked Questions

Everything you need to know about our hybrid processing, security, and export capabilities.