guid-formatter

Generate a random GUID, or paste one you already have, and see it in every format .NET's Guid.ToString() supports.

client-side only v4 random

input.guid

GUID (any format — leave blank to generate one)

// the five formats

N — 32 digits, no dashes: 32digits
D — 32 digits with hyphens (the default from Guid.ToString() and Guid.NewGuid()): 8-4-4-4-12
B — same as D, wrapped in braces: {8-4-4-4-12}
P — same as D, wrapped in parentheses: (8-4-4-4-12)
X — the four-part hex constructor form used when writing new Guid(0x..., 0x..., ...) directly in code, e.g. for seeded/well-known IDs in EF Core migrations.

// where this actually bites

│

SQL Server's uniqueidentifier type is happy with the D format (with or without braces) but will reject the N format outright since it expects the hyphens. Going the other way, some third-party APIs expect N format specifically and will fail silently or reject a request if you send hyphens. This mismatch is a common source of "works locally, breaks against this one API" bugs — worth checking the exact format a downstream system expects rather than assuming .ToString()'s default is universal.