Large archives are always a pain with online services because of slow upload speeds and limits. I had the same issue with 4–5 GB RAR files. The only tool that worked consistently for me was Softaken Archive Converter. It’s an offline RAR to ZIP converter for Windows, so there’s no need to upload. I’ve tested it with archives in the multi-GB range, and it handled them without errors. The tool preserves quality and folder structure, which was important for me since the files needed to remain intact. Plus, you can convert multiple large archives at once, saving a lot of time