Free HEIC to JPG Converter
Drop a HEIC or HEIF still. The converter decodes it in this browser and downloads a JPG at the same width and height.
HEIC is the usual iPhone still-photo file. JPG is what most websites and Windows apps accept. Processing stays in the browser. Nothing is uploaded to RootoverZero servers. Full article: How to convert HEIC photos to JPG. After conversion, use the Image Resizer for exact pixels or the Image Compressor if the JPG is still heavy.