FileOnTap

FileOnTap's HEIC to PNG converter turns iPhone HEIC and HEIF photos into PNG files right in your browser. Pick up to 10 photos at once; they're converted locally on your device, so nothing is uploaded to a server, and you can download each PNG or a single ZIP. It's free, needs no account, and works on Windows, Mac, Linux and Chromebook. FileOnTap also offers HEIC to JPG, WebP to PNG, image compression and PDF tools.