Heiter
4K Anime Video Upscaler
Only for Mac
Free
Mac
Heiter brings classic anime videos to modern quality.
Heiter upscales old episodes directly on your Mac - no cloud, no upload.
You choose the file and settings, Heiter handles the rest.
Features
- 4K upscaling with Real-ESRGAN (2x or 4x)
- 4:3 to 16:9 conversion
- Crop mode: trims top and bottom
- Blur Fill mode: fills the sides with blurred content
- Stretch mode: stretches the image to 16:9
- Hybrid mode: less image loss than Crop, less distortion than Stretch
- Engine selection: AI Quality, Lanczos Fast, Reframe without upscaling
- Preserves audio and subtitle tracks (container dependent)
- Robust handling of old AVI/DivX/Xvid files
- Video preview with MKV/AVI fallback
- Desktop notification after successful exports
- Power Mode: Cool, Balanced, Max
- Freely selectable time range with start and end time
- Fully local on your device
Why Heiter
- No files are uploaded
- No registration required
- Optimized for Apple Silicon
- Preserves the anime look: clean lines, natural colors
Supported formats
- Input: MP4, MKV, MOV, M4V, AVI
- Output for MP4/MOV/M4V/AVI input: MP4 (HEVC/H.265)
- Output for MKV input: MKV (HEVC/H.265, audio/subtitle tracks preserved where compatible)
System requirements
- macOS 14 or newer
- Apple Silicon recommended (M1 or newer)
License notice
Heiter uses Real-ESRGAN by Xintao Wang et al., licensed under BSD-3-Clause.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- New engine selection: AI Quality, Lanczos Fast and Reframe without upscaling
- New Hybrid mode for 4:3-to-16:9 exports
- Improved handling of old AVI, DivX and Xvid files
- Improved audio track and subtitle preservation for MKV exports
- More reliable MKV audio start, especially in VLC
- New video preview with improved MKV/AVI fallback
- Desktop notification after successful exports
- Cleaner export filenames with resolution, aspect mode and selected range
- Workflow improvements: recent files, remembered output folder and Finder actions
- Optimizations & bug fixes
The developer, MetaFlash GbR, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- MetaFlash GbR
- Size
- 7.1 MB
- Category
- Photo & Video
- Compatibility
Requires macOS 14.0 or later.
- Mac
Requires macOS 14.0 or later.
- Mac
- Languages
English and 2 more
- English, German, Japanese
- Age Rating
4+
- 4+
- Copyright
- © 2026 MetaFlash