Free Online Image Converter & Compressor
MediaCC Image Converter is a tool that lets you convert and compress images directly in your browser. No file upload, no server processing, and no privacy risk. Your files never leave your device.
Why Choose MediaCC?
- 100% local processing – files never leave your device
- Free to use, no signup required
- Fast image conversion and compression
- Supports HEIC, JPG, PNG, WebP, AVIF and more
How It Works
- Select an image from your device (drag & drop or click to upload)
- Choose output format or compression level
- Download the processed image instantly – all processing happens locally in your browser
Drag and drop image files here
Or click the button below to select files
100% local processing, files are not uploaded to server
Supported Image Formats
JPG/JPEG/PNG/GIF/WebP/HEIC/AVIF/BMP/TIFF
Detailed Usage Guide
How to Use
1. Format Conversion
- Supported formats: JPG/JPEG, PNG, GIF, WebP, AVIF, HEIC, BMP, TIFF
- Select "Convert" operation and choose the target format (e.g., JPG to PNG)
- Click the "Start Processing" button, and the system will complete the conversion locally in your browser
- After conversion, you can directly download the image in the new format
2. Image Compression
- Select "Compress" operation and choose compression mode
- Lossless compression: Maintains original quality while optimizing file size (approximately 10% reduction)
- Lossy compression: Balances quality and file size, significantly reducing file size (approximately 50% reduction)
- Supports batch processing of multiple image files
3. Batch Processing
- You can upload multiple image files simultaneously
- All files will be processed in queue order
- Each file can be downloaded individually after processing is complete
4. File Size Limits & Notes
- Single file limit: Maximum 150MB per image file
- Total file size limit: Maximum 1000MB total file size per session
- File count limit: Maximum 15 files can be processed simultaneously
- Large file processing warnings:
- Larger files take longer to process; we recommend keeping individual files under 50MB for the best experience
- Files over 100MB may cause processing timeout or browser memory issues
- If processing fails due to large file size, consider compressing the image with another tool first
- Keep the browser tab open when processing large files to avoid interruption from switching tabs
Implementation Principles
Format Conversion Principle
- HEIC/HEIF: Decoded client-side via heic2any (WebAssembly), then output as JPG/PNG/WebP
- Other formats: Canvas API loads image, draws to canvas, exports via toBlob()
- For JPEG and WebP, quality parameters can be set (default 92%)
- AVIF and other unsupported formats may fallback to PNG or prompt the user
Compression Principle
- HEIC source: First converted to JPG/PNG via heic2any, then compressed
- Uses browser-image-compression for intelligent compression:
- Lossless compression: Maintains original format and quality while reducing file size through optimized encoding parameters
- Lossy compression: Adjusts quality parameters (75%) and compression algorithms to maximize compression ratio within acceptable visual quality
- Uses Web Worker for background thread processing without blocking the main interface
- Automatically maintains original resolution without changing image dimensions
Privacy & Security
All processing happens locally in your browser. MediaCC never uploads, stores, or analyzes your files. Your images stay on your device from start to finish – no server, no cloud, no third-party access.