How to Look Up a Steam Community Profile with STEAMID I/O

Updated

STEAMID I/O is a free web tool that converts between Steam identifier formats — steamID, steamID3, steamID64, and customURL — so you can find a Steam Community profile page. To use it, you need at least one known identifier for the account (a steamID, steamID3, steamID64, or customURL). Enter it on the site, let the tool convert it to a steamID64, then use that number to reach the profile.

What each identifier is

The site describes these formats as follows:

Identifier What it is
steamID The unique identifier used to identify a Steam account
steamID3 A newer format that a steamID can be converted to
steamID64 Also called community ID or friendID; the number that maps to a Steam Community page
customURL An optional, more personalised identifier for looking up a Steam Community page

The key relationship: a steamID can be converted to steamID3 and to steamID64, and it is the steamID64 that lets you find a user's Steam Community page.

Steps to look up a profile

  1. Get one known identifier. You need the account's steamID, steamID3, steamID64, or customURL. If you only have a customURL, that works as a starting point too.
  2. Open STEAMID I/O and go to the lookup page. The site's navigation lists home, lookup, feedback, and privacy.
  3. Choose the entry mode. The lookup supports single entry and extended list — use single entry for one account, extended list when you have several identifiers to process.
  4. Enter the identifier and run the conversion. The tool converts it to a steamID64.
  5. Use the steamID64 to reach the profile. With the steamID64 in hand, the user's Steam Community page can be found.

Faster option: browser search plugin

If your browser is OpenSearch compliant — the site names Firefox, Chrome, and Internet Explorer 7 and above — you can install the STEAMID I/O search plugin and run lookups directly from the browser's search bar instead of visiting the site each time. The site provides an install link for this.

Practical notes

  • The conversion direction matters: you can start from any of the listed formats, but the steamID64 is the value that resolves to a Community profile.
  • If you are processing multiple accounts, the extended list mode avoids repeating the single-entry flow.
  • STEAMID I/O states it is not affiliated with Valve; it credits Valve's API as a data source and xPaw for a steamID library.