Convert HEIC to Lossless PNG Offline
Extract transparent or high-fidelity assets from Apple's HEIC format with pixel-perfect accuracy.
Deep-Dive Guide & Information
Format Definition
HEIC is an advanced image format used by default on modern Apple hardware, optimized for storing high-quality photos in small file envelopes. PNG (Portable Network Graphics) is a lossless bitmap format designed for the web, renowned for its flawless preservation of transparency, crisp text rendering, and high color accuracy.
Why Convert?
While HEIC excels at space-saving for photographs, PNG is the industry standard for graphic design, web assets, and layered templates. If your HEIC image contains transparent elements or is a complex UI mockup captured on an iPhone, converting it to PNG guarantees that the transparency remains intact and that the image can be edited across professional suites like Photoshop, Figma, or GIMP without introducing compression artifacts.
How It Works Locally
On Apple devices where the browser already decodes HEIC natively, we use that decoder directly. Everywhere else, we load heic2any (a JavaScript/WebAssembly build of libheif) the first time you add a HEIC file. Either way, the decoded pixel and transparency data are drawn onto a canvas, then converted to a PNG blob using the browser's native lossless PNG encoder.
Impact on Image Quality
Because PNG is a completely lossless format, converting HEIC to PNG results in absolutely zero loss of visual quality. Every detail of the original container is perfectly preserved. The trade-off is file size: PNG files are uncompressed or losslessly compressed, which means the resulting PNG file will be significantly larger than the original HEIC file.
Guaranteed Privacy & Data Safety
Security is paramount. The entire HEIC decoding and PNG compilation sequence occurs within your system RAM inside the browser tab. We never upload your images to a remote server. Your confidential designs, screenshots, and private photos remain completely under your control and never leave your computer.
Browser Support & Performance
This converter runs smoothly on all modern desktop and mobile browsers. Since PNG generation is natively supported by all browsers, the main performance limit is the HEIC decoding step, which is handled programmatically. For batches of large HEIC photos, we recommend using a desktop browser with ample RAM.