Where the ceiling is
Twitch avatar links end with their dimensions, as in -profile_image-300x300.png. Changing that number requests a different rendition, but only certain sizes exist. Testing found a clear boundary:
| Size requested | Result |
|---|---|
| 300×300 (channel page default) | 101 KB |
| 600×600 | 247 KB |
| 1200×1200 | 404 — does not exist |
| No size in the filename | 404 — does not exist |
So 600 is the real maximum, at roughly two and a half times the data of the default. Requests above it return an error page rather than an image. This tool asks for 600 and checks the response is genuinely an image before handing you the link, so a Twitch change can never produce a broken download.
Channel name, not display name
Many streamers display a stylised name with different capitalisation or extra characters. The name that works is the one in the URL: for twitch.tv/shroud, that is shroud. Capitalisation does not matter.
Avatar, not offline banner or panels
A Twitch channel has several images: the round avatar, the wide offline banner, the profile banner and the panel graphics below the player. This tool handles the avatar only. The others are stored separately and are not part of the profile lookup.
Deleted and renamed channels
If a lookup fails on a name you are sure about, the channel may have been renamed or removed. Twitch allows name changes, and the old name stops resolving afterwards.