Heiter

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.