What is the difference between UUID and ULID?

UUID v4 is fully random. ULID is lexicographically sortable and encodes a timestamp, making it useful for database indexes and chronological ordering without a separate created_at column.

Are these UUIDs cryptographically random?

UUID v4 and ULID use the Web Crypto API's getRandomValues for cryptographically secure randomness. UUID v1 uses a MAC address and clock; UUID v5 is deterministic from a name and namespace.

What format are the generated IDs?

UUIDs are 36 characters with hyphens (8-4-4-4-12). ULIDs are 26 characters in Crockford Base32 (no hyphens). Toggle uppercase and hyphens as needed.

Can I generate multiple IDs at once?

Yes. Set the count parameter to generate up to hundreds of IDs in one operation, each on a separate line.

Is UUID v1 safe to use?

UUID v1 encodes the host MAC address and clock time, which can leak machine identity and timing. Prefer v4 or ULID for privacy-sensitive contexts.

How does UUID v5 work?

UUID v5 is deterministic: given the same namespace and name, it always produces the same UUID. Useful for stable IDs derived from names (e.g. URLs, email addresses).

UUID/ULID-Generator

Generate UUID v1, v4, v5, and ULID identifiers. Kostenlos, privat und 100% clientseitig.

param.versionparam.countparam.uppercaseparam.hyphens

Eingabe

Beispiel ausprobieren:

Ausgabe

Local only

Letzte Verlauf

Noch kein Verlauf

Verwendung

Select the version: UUID v1, v4, v5, or ULID.
Set the count of IDs to generate.
Toggle uppercase and hyphens as needed.
Copy the generated identifiers.

Aufgaben mit diesem Tool

Erzeugen NanoIDs for compact unique identifiers

NanoID ist ein tiny, URL-sicher, eindeutig ID generator. Smaller und faster than UUID, mit customizable alphabet und Größe.

AUFGABE

Erzeugen a cryptographically secure random password

Erstellen ein high-entropy Passwort mit ein cryptographically sicher random generator, mit control über Länge und Zeichen sets.

AUFGABE

Erzeugen RSA key pair and inspect self-signed certificate fields

Erstellen ein RSA Schlüssel pair für testing, und understand der Struktur von ein self-signed X.509 certificate für lokal development.

AUFGABE

Erzeugen Snowflake IDs for distributed systems

Snowflake IDs (Twitter) combine timestamp, machine ID, und sequence Zahl für eindeutig, sortable IDs in distributed Systeme ohne coordination.

AUFGABE

Erzeugen ULIDs for time-sortable identifiers

ULID (Universally Eindeutig Lexicographically Sortable Identifier) combines ein timestamp mit random Daten, producing IDs das sortieren durch creation time.

AUFGABE

Pipelines mit diesem Tool

UUID generieren und als Base58 kodieren

PIPELINE

UUID generieren und Base64 kodieren

PIPELINE

Häufige Fragen

What is the difference between UUID and ULID?: UUID v4 is fully random. ULID is lexicographically sortable and encodes a timestamp, making it useful for database indexes and chronological ordering without a separate created_at column.
Are these UUIDs cryptographically random?: UUID v4 and ULID use the Web Crypto API's getRandomValues for cryptographically secure randomness. UUID v1 uses a MAC address and clock; UUID v5 is deterministic from a name and namespace.
What format are the generated IDs?: UUIDs are 36 characters with hyphens (8-4-4-4-12). ULIDs are 26 characters in Crockford Base32 (no hyphens). Toggle uppercase and hyphens as needed.
Can I generate multiple IDs at once?: Yes. Set the count parameter to generate up to hundreds of IDs in one operation, each on a separate line.
Is UUID v1 safe to use?: UUID v1 encodes the host MAC address and clock time, which can leak machine identity and timing. Prefer v4 or ULID for privacy-sensitive contexts.
How does UUID v5 work?: UUID v5 is deterministic: given the same namespace and name, it always produces the same UUID. Useful for stable IDs derived from names (e.g. URLs, email addresses).

Letzte Verlauf

Verwendung

Aufgaben mit diesem Tool

Pipelines mit diesem Tool

Häufige Fragen

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