Yes. HEIC to JPG Converter is completely free, with no sign-up, no daily limit, and no watermark on what you download.
HEIC (High Efficiency Image Container) is the default photo format on iPhones and iPads since iOS 11. It saves storage space but is not supported by many apps, websites and Windows programs — converting to JPG makes your photos work everywhere.
The converter uses a high JPEG quality setting (92 by default, adjustable up to 100). At these settings you will not notice any difference, and the resulting JPG opens on every device, app and website.