Why convert HEIC to JPEG
Windows and Android compatibility
HEIC is Apple's proprietary format. Windows requires additional codecs, Android before version 10 doesn't support HEIC at all. Converting to JPEG solves the compatibility problem once and for all.
Uploading to websites and social media
Many websites, forums, and CMS don't accept HEIC. Even if a platform supports the format (Instagram, Facebook), uploading JPEG is faster and more stable.
Editing in Photoshop and other programs
Photoshop supports HEIC only in newer CC versions. Free editors (GIMP, Paint.NET) and online services often don't work with HEIC. JPEG opens everywhere.
Photo printing
Photo labs and printers accept JPEG, PNG, and TIFF. HEIC needs to be converted before sending for printing — do it in advance to avoid problems.
Long-term storage
JPEG is an open standard with 30 years of history. Your photos will open in 10, 20, 50 years. HEIC is a relatively new format with a less predictable future.