Let’s get to the practical part. Below are the most effective methods, ranked from easiest to most technical.
After reading this far, you might be frustrated. You wanted a tool where you paste ed2k://... and get magnet:?....
That tool does not exist.
The reason is cryptographic security. If you could mathematically turn an Ed2k MD4 hash into a BitTorrent SHA-1 hash, you would have broken two encryption standards simultaneously. The only thing linking the two formats is the binary data of the file itself.
Think of it this way:
The "database" that cross-references them is the public internet (general search engines) or caching tools like JDownloader.
Bottom line: Ed2k is a dying network. If you have important files shared only via Ed2k, your best bet is to run eMule 24/7 with Kad enabled and hope someone else is still sharing. Once downloaded, create a torrent and magnet link yourself to preserve the file for the future. Convert Ed2k To Magnet
Some modern torrent clients support both ED2K and Magnet links. You can add the ED2K link through the client and then obtain the Magnet link: