Medra
Image & Video Compression
Free · Designed for iPad
A clean and efficient iOS app for compressing images, videos, and audio files. Extensive customization options to meet your personalized needs. Runs locally without network, protecting your privacy and security.
## Core Features
- Support batch selection of images, videos, and audio (up to 20 files)
- Support multiple media formats
- Images: JPEG/PNG/HEIC/WebP/AVIF/GIF
- Videos: MOV/MP4/M4V/WebM
- Audio: MP3/M4A/AAC/WAV/FLAC/OGG
- Real-time processing progress display
- Intelligent quality protection mechanism
## Three Main Media Types
### 1. Video Tools
#### Video Compression
- Support MOV/MP4/M4V formats
- Use FFmpeg hardware-accelerated encoding (VideoToolbox)
- Support H.264 and H.265/HEVC encoding
- Adjustable resolution (Original/4K/2K/1080p/720p)
- Adjustable frame rate (23.98-60 fps, only supports lowering frame rate)
- Metadata control: preserves container tags by default, when "Preserve Metadata" is disabled, uses FFmpeg `-map_metadata -1` to remove metadata from exported files
- Bitrate control:
- **Auto Mode** (default): intelligently adjusts based on target resolution
- 720p ≈ 1.5 Mbps
- 1080p ≈ 3 Mbps
- 2K ≈ 5 Mbps
- 4K ≈ 8 Mbps
- **Custom Mode**: manually set bitrate (500-15000 kbps)
- Actual bitrate may be lower than target (VideoToolbox dynamically adjusts based on content complexity to optimize efficiency)
- Smart decision: preserve original file if compressed version is larger
#### Video Format Conversion
- Batch convert video formats: MP4 ↔ MOV ↔ M4V ↔ WebM
- Lossless conversion (where possible), maintaining original quality
- **Smart Audio Copy**: Automatically copies audio stream when compatible to avoid re-encoding
- **Smart Encoding**: Automatically uses hardware acceleration (VideoToolbox) for H.264/HEVC or VP9 for WebM when transcoding is necessary
- **Bitrate Preservation**: Maintains original video bitrate during transcoding to minimize quality loss
#### Video to Animation
- Convert video to animated WebP, AVIF, or GIF
- **Auto-optimized**: Uses optimized presets (15 fps, high quality) for best balance of size and quality
- **High Efficiency**: Direct AVIF conversion using libaom-av1 for superior compression
#### Extract Audio
- Extract audio track from video files
- Save as MP3, M4A, AAC, FLAC, WAV, or OGG
### 2. Image Tools
#### Image Compression
- Support JPEG/PNG/HEIC/WebP/AVIF/GIF formats
- Use MozJPEG for high-quality JPEG compression
- PNG compression using pngquant + optional Zopfli (lossy quantization + lossless deflate)
- **Animated WebP/AVIF/GIF Support**:
- Auto-detect animated files
- Option to preserve animation or convert to static image
- Frame-by-frame compression, maintaining timeline information
- Smart fallback: preserve original file if compressed lossless format is larger
- Visual indicator: clearly display animation status and frame count
- Adjustable compression quality (10%-100%)
- Support resolution adjustment (Original/4K/2K/1080p/720p)
- Auto orientation detection (landscape/portrait)
- Smart decision: preserve original file if compressed version is larger
#### Image Format Conversion
- Batch convert image formats: JPEG ↔ PNG ↔ WebP ↔ HEIC ↔ AVIF ↔ GIF
- No compression, only format modification
### 3. Audio Tools
#### Audio Compression
- Support MP3/M4A/AAC/WAV/FLAC/OGG input
- 8 bitrate options (32-320 kbps)
- 7 sample rate options (8-48 kHz)
- Channel selection (mono/stereo)
- Smart quality protection: prevent low-quality audio from being "upscaled"
- Smart decision: preserve original file if compressed version is larger
#### Audio Format Conversion
- Batch convert audio formats: MP3 ↔ M4A ↔ FLAC ↔ WAV ↔ WebM
- Lossless conversion (where possible)
Add video-to-animated-image conversion, and support Web formats for video and audio.
The developer, 金标 李, 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
- 金标 李
- Size
- 32.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2025 ARayOfSunshine