You don’t need to be a programmer. For 99% of Switch patches, you will use one tool: (for Windows/Mac/Linux) or MultiPatch (for Mac).
Emulators like Yuzu and Ryujinx sometimes require specific "keys" or firmware files to decrypt games. While not a "ROM patcher" in the traditional sense, tools that handle these files are often grouped in the same category. Furthermore, "NSP Builder" tools allow users to convert file formats (e.g., converting a folder of game files into a playable NSP) or "trim" unnecessary data from XCI files to save hard drive space. nintendo switch rom patcher
Community members use patchers to translate games that were never released in specific regions. You don’t need to be a programmer
Nintendo has a massive backlog of Japan-exclusive games. Mother 3 is the famous example, but many visual novels and RPGs never made it west. Fan translation teams release patches that convert the Japanese text to English. Without a patcher, those games are unplayable for most of us. While not a "ROM patcher" in the traditional