The 1.11.13 version of HEICtoJPEG for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The actual developer of this free software for Mac is ingconti.com. The application lies within Design & Photo Tools, more precisely Converters.
From the developer:
HEICtoJPEG is an application that offers an easy solution to convert HEIC images stored on your iPhone or in iCloud into JPG and PDF file formats. The app is very easy to use. Loading files is done either by browsing from within the app or by dragging the images directly on view. Consequently, your HEIC images will be converted instantly into JPG or PDF.
You may want to check out more Mac applications, such as PDF Image Extractor Pro, Save PDF Pages as Images or AuroraSvgViewer, which might be similar to HEICtoJPEG.