Professional Letterbox Generator for CapCut, VN Editor, FCPX & All Major Video Editing Software
FrameGen delivers instant cinematic letterbox frames for TikTok (9:16), Instagram (1:1, 4:5), YouTube (16:9), and ultra-wide formats (5120×1080). Professional-quality letterbox overlays designed for both mobile editors using CapCut, VN Video Editor, and InShot, plus desktop professionals working with DaVinci Resolve, Final Cut Pro, and Adobe Premiere Pro.
Platform Support
- Mobile: CapCut, VN Video Editor, InShot, Filmora Go
- Desktop: DaVinci Resolve, Final Cut Pro X, Premiere Pro, After Effects
- Formats: TikTok (9:16), Instagram (1:1, 4:5), YouTube (16:9), Ultra-wide (5120×1080)
Export Options
- 4K/8K transparent PNG letterbox overlays for professional editing
- 1080p/720p formats optimized for mobile editing apps
- Custom thickness and corner radius controls for brand consistency
Workflow Highlight
From CapCut to DaVinci Resolve: One Letterbox for All Platforms
Create once, use everywhere. FrameGen generates professional letterbox overlays that work seamlessly across mobile apps like CapCut and VN Editor, plus desktop software like Final Cut Pro and DaVinci Resolve.
Universal compatibility in every export
Generate transparent PNG letterbox overlays instantly—no downloads, installations, or file management required.
Social Media Platform Aspect Ratios & Visual Impact
Different platforms optimize for specific aspect ratios. FrameGen generates letterbox overlays for all major social media formats, ensuring your content looks professional across TikTok, Instagram, YouTube, and more.
- • TikTok (9:16): Vertical letterbox for mobile-first storytelling
- • Instagram Stories/Reels (9:16): Maximum engagement in portrait mode
- • Instagram Feed (1:1, 4:5): Square and portrait posts for feed optimization
- • YouTube (16:9): Widescreen cinematic experience for desktop viewing
- • Ultra-wide (5120×1080): Premium format for dual-monitor and LED displays
Mobile vs Desktop Editing Software Compatibility
FrameGen exports work seamlessly across both mobile and desktop editing platforms. Generate transparent PNG letterbox overlays that import directly into your preferred editing software.
- • Mobile Apps: CapCut, VN Video Editor, InShot, Filmora Go, PowerDirector
- • Professional Desktop: DaVinci Resolve, Final Cut Pro X, Adobe Premiere Pro, After Effects
- • Import Method: Drag-and-drop transparent PNG overlays (no blending modes required)
- • Quality: 4K/8K resolution letterbox frames for professional productions
Professional Letterbox Generation for Modern Video Workflows
FrameGen delivers instant, browser-based letterbox generation optimized for today's multi-platform video workflows. From TikTok creators using CapCut to professional editors working in DaVinci Resolve, get cinematic letterbox overlays without downloads or installations.
- • Instant Access: No downloads, installations, or file management required
- • Mobile-First: Works with CapCut, VN Video Editor, and other mobile apps
- • Custom Control: Adjustable thickness, corner radius, and aspect ratios
- • Multiple Formats: Generate for TikTok, Instagram, YouTube in one workflow
Client feedback
"FrameGen streamlined our video production workflow across TikTok, Instagram, and YouTube. We can generate professional letterbox overlays for CapCut and DaVinci Resolve projects instantly, keeping our content pipeline moving fast."
Frequently asked questions
Everything you need to know about FrameGen
Which video editing apps support FrameGen letterbox overlays?
All major mobile and desktop editing software. Mobile: CapCut, VN Video Editor, InShot, Filmora Go, PowerDirector. Desktop: DaVinci Resolve, Final Cut Pro X, Adobe Premiere Pro, After Effects. Simply import the transparent PNG overlay and position above your video layer.
What aspect ratios work best for TikTok and Instagram?
TikTok and Instagram Reels perform best in 9:16 (vertical) format. Instagram Feed supports 1:1 (square) and 4:5 (portrait). YouTube optimizes for 16:9 (widescreen). FrameGen generates letterbox overlays for all these formats with custom thickness controls.
Does FrameGen work offline or require internet connection?
FrameGen is a browser-based tool that requires internet connection for initial loading. Once loaded, the letterbox generation happens locally in your browser. Export and download of PNG files work instantly without additional server requests.
Can I use FrameGen letterbox overlays commercially?
Yes, all FrameGen exports are royalty-free for commercial use. Create letterbox overlays for client projects, social media campaigns, music videos, and commercials. Perfect for agencies managing multiple brand accounts across TikTok, Instagram, and YouTube.
What resolution should I use for different platforms?
Mobile editing (CapCut, VN Editor): 1080p letterbox overlays for fast rendering. Desktop professional (DaVinci, FCPX): 4K/8K for maximum quality. Ultra-wide displays: 5120×1080 for LED walls and dual-monitor setups. FrameGen exports all resolutions instantly.
How do I import letterbox overlays into CapCut and VN Video Editor?
Download the transparent PNG from FrameGen. In CapCut: tap "Overlay" → "Add Overlay" → select the PNG file. In VN Video Editor: tap "Sticker" → "Import" → choose the letterbox PNG. Position the overlay above your video timeline for instant cinematic frames.
How do I create 5120×1080 ultra-wide videos for Instagram's "Thinnest Video" trend?
Generate a 5120×1080 letterbox overlay from FrameGen, then import into CapCut or VN Editor. Set your project to landscape mode, add the ultra-wide letterbox above your footage. This creates the cinematic "thinnest video" effect that's trending on Instagram Reels and TikTok.
What's the best workflow for creating multi-platform content with FrameGen?
Create your base video content, then use FrameGen to generate letterbox overlays for each platform: 9:16 for TikTok/Instagram Stories, 1:1 for Instagram feed, 16:9 for YouTube, and 5120×1080 for ultra-wide trends. Export once from your editing app with different letterbox overlays for maximum reach.