HEIC to PNG Converter - Lossless, No Upload

What HEIC to PNG Conversion Does

A .heic file is an HEIF container — the ISO High Efficiency Image File Format — holding a picture compressed with HEVC, the codec built for 4K video. Converting to PNG means decoding that HEVC bitstream all the way back to raw pixels and then re-compressing those pixels with PNG's DEFLATE, which is lossless. That distinction is the whole reason to pick PNG here. The decoded pixels coming out of the HEIC file are written into the PNG unchanged, so the conversion introduces no generation loss whatsoever: no blocking, no ringing around hard edges, no colour smearing, no quality slider to second-guess. Convert the same file a hundred times and every output is byte-identical. PNG is also the only one of the three common targets that carries an alpha channel the way HEIF does. If your HEIC holds a screenshot with rounded transparent corners, a sticker, an exported logo, or anything else with genuine see-through regions, PNG keeps those pixels transparent. JPG has no alpha at all and would flatten them onto a solid background. The decode happens on your own device using libheif compiled to WebAssembly — the first conversion spends a few seconds downloading and starting that module, and later ones reuse it. Nothing is transmitted anywhere. What PNG will not do is make the file smaller. It is a lossless format applied to photographic data, which is close to a worst case for it, and the honest expectation is an output several times the size of the HEIC input. PNG also does not preserve HEIF's extras: a Live Photo's motion track is dropped and only the still key frame survives, Portrait mode depth maps are discarded, and 10-bit HEIC content is written out at 8 bits per channel. What you get is an exact, universally readable copy of the visible image.