One Mangadex URL can mean one item or a whole feed, and that distinction matters more than it looks. Paste the single-item link if you want exactly that item; paste the feed or collection URL if you want what it contains. Both resolve, they just resolve to different things. The extractor covers 5 separate Mangadex URL shapes, so a link copied from anywhere on the site usually resolves as-is. Everything from Mangadex goes through the gallery route, which enumerates a post's files instead of negotiating a stream. No credentials are involved anywhere in this path — neither yours nor ours.
The address bar works too. Prefix any Mangadex URL with tikt.com/:
tikt.com/https://www.example.com/path/to/media
Three steps, start to finish
1. Open the Mangadex post
Find the Mangadex post, album or profile page holding what you want and copy its address. A post URL gets you that post; a profile URL gets you what the profile has published.
2. Paste it above
Drop the URL into the field at the top of this page. The gallery extractor enumerates the files attached to that Mangadex page rather than guessing at one.
3. Take the files
Each file is listed at the size it was uploaded to Mangadex. Save one, or save the lot — nothing has been resampled or re-encoded in between.