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Drop one HEIF or two hundred. Batch conversion is not a paid feature here.
An image with a .heif extension came from an Apple device or a modern camera and nothing on a Windows or Linux machine will display it.
HEIF is the container; the picture inside is normally HEVC-coded. It is decoded and re-encoded as JPEG, which every application can read, at the cost of a larger file.
HEIF is a container, not a codec, so two files with the same extension can hold different codecs inside. That is why one .heif opens in a given tool and another does not, and why the fix is conversion rather than a codec pack.
HEIC is the name Apple uses for HEIF files containing HEVC images. Effectively the same thing with different extensions.
No. HEIF can hold bursts and image sequences, and JPEG holds one picture, so only the primary image is kept.
Drop one HEIF or two hundred. Batch conversion is not a paid feature here.
JPEG Image is lossy, so the quality control decides the trade between size and fidelity.
Converted and deleted the moment it finishes. Never written to permanent storage.