Archyv is a native macOS app for managing large photo and media collections in bulk. It reads 40 file formats across 44 extensions — standard image formats, RAW from the major camera makers, and video — and writes metadata to 32 of them, using a bundled copy of ExifTool. There is no account and no cloud processing; your photos never leave your Mac. Changes made in place are recorded in a change history and can be undone for a retention period you set, removed duplicates go to the Trash, and conversions write new files rather than altering the originals. A Simulation Mode performs a full run without changing anything so you can read the result first.