How It Works
100% Browser-Based Processing
FastHEIC uses cutting-edge WebAssembly (WASM) technology to convert your HEIC files directly in your browser. This means your files never leave your device - they're processed locally on your computer using the same powerful libraries that professional image editing software uses.
🔒 Your files never touch our servers - complete privacy guaranteed
The Conversion Process
File Selection
Drag and drop your HEIC files or click to browse. You can select multiple files for batch conversion - no limits on quantity.
Local Processing
Our WASM-based decoder reads the HEIC format and extracts the image data. The conversion happens entirely within your browser's sandbox environment.
Quality Optimization
The image is re-encoded as a high-quality JPG with optimized compression settings to maintain image quality while ensuring broad compatibility.
Instant Download
Download individual files as they complete or use our bulk download feature to get all converted images in a single ZIP file.
Technical Implementation
HEIC Decoding
Uses libheif compiled to WebAssembly for native-speed HEIC/HEIF format support
JPG Encoding
Canvas API with optimized quality settings for the best size-to-quality ratio
Memory Management
Efficient memory usage with automatic cleanup to handle large files and batches
Error Handling
Robust error recovery with detailed feedback for any conversion issues
Why Browser-Based Conversion?
Complete Privacy
Your files are never uploaded anywhere. Processing happens entirely on your device.
Lightning Fast
No network delays. Conversion starts immediately and runs at full CPU speed.
No Limits
Convert as many files as you want, any size, without restrictions or quotas.
Browser Compatibility
FastHEIC works on all modern browsers that support WebAssembly: