batch converting hundreds of heic photos to png on windows 11

Copied about 600 iPhone photos to my PC and they're all HEIC. Need PNG for a photobook site. One at a time is not an option. Something free that does a whole folder?
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eliza_fixes Oct 20, 2026
zeel_x
XnConvert does this well and it's free. Drag the whole folder in, go to the Output tab, pick PNG and an output folder, hit Convert. Hundreds take a few minutes. You may need the HEIF Image Extensions from the Microsoft Store if it can't read the files. Heads up though, PNGs will be several times bigger than the HEICs. If it's just photos, JPG is the more sensible choice.