Minecraft UUID and Skin Lookup

From username to UUID, from UUID to skin, and the UUID an offline server makes up.

Every Minecraft Java Edition account has a UUID, a 128-bit number written as 32 hexadecimal digits, such as 069a79f4-44e9-4726-a5be-fca90e38aaf5, which is Notch's account. The username can change; the UUID cannot. That is why whitelist.json, ops.json, playerdata files, permission plugins and head commands store the UUID instead of the name. This tool asks Mojang for you: type a username or paste a UUID (dashed, undashed, as an int array or as two longs) and it detects the format, returns the name with its correct capitalization and shows the UUID in every form the game uses. The int array [I;a,b,c,d] is the NBT and command form since 1.16; the two longs (most and least significant) are the ones from java.util.UUID. The skin is read from the textures property that the session server returns in base64: the tool extracts only the image hash, loads the PNG straight from textures.minecraft.net and draws the body from the front and back, the head and the cape on a canvas, with or without the outer layer (hat, jacket, sleeves, pants). The model comes from the metadata: slim (3 px arm, the old Alex) or classic (4 px arm, Steve). Old 64x32 skins are converted the way the game does it, and HD skins (128x128 and multiples) work. You can download the skin, the cape or just the head as PNG. The Offline UUID tab computes what a server running online-mode=false assigns to a player: the MD5 of the string OfflinePlayer:name, with the version 3 and RFC 4122 variant bits forced, exactly like Java's UUID.nameUUIDFromBytes. For the name Notch it gives b50ad385-829d-3141-a216-7e7d7539ba7f, very different from the online UUID. That difference is the classic cause of inventories and chests vanishing when a server changes mode. The Batch tab converts up to 100 names (Mojang accepts 10 per request and the tool splits them for you) and exports whitelist.json, ops.json, CSV or plain text. Head commands changed syntax in 1.20.5: it used to be the SkullOwner tag, now it is the minecraft:profile component, and 1.21.9 added /fetchprofile; the tool shows both forms. Limitations: Java Edition only (Bedrock uses another identifier), and Mojang rate-limits lookups per IP, so results are cached for a few minutes.

Type a username or UUID and copy the format you need.

1. In Lookup, type the username (1 to 16 characters) or paste the UUID in any format and press Look up. Copy the UUID with dashes, without dashes, the NBT int array or the longs.
2. See the skin from the front and back, turn the outer layer on or off, download the skin, head or cape as PNG, and copy the head, whitelist, op and ban commands.
3. For an offline server use Offline UUID; for whole lists use Batch and export whitelist.json or ops.json; to switch between formats use Convert UUID.

Use this tool on your site

<iframe
  src="https://jkit.tools/embed/en-US/minecraft-uuid-lookup"
  width="100%"
  height="600"
  style="border:0"
  loading="lazy"
  title="Minecraft UUID and Skin Lookup"
></iframe>

Sources and references for this tool

These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.

• Mojang APIMinecraft Wiki, Mojang endpoints for name, UUID, profile and textures, with limits.
• Player headMinecraft Wiki, Player head syntax and the SkullOwner to minecraft:profile change in 1.20.5.
• Data component format/profileMinecraft Wiki, Fields of the minecraft:profile component (name, id, properties).
• /fetchprofileMinecraft Wiki, The /fetchprofile command, added in 1.21.9.
• Universally unique identifierMinecraft Wiki, UUIDs in Minecraft: offline UUID (MD5, version 3) and the NBT int array.

Frequently asked questions

Where to go next