Runs locally
Switch toolUUID Generator

JSON & structured data

JSON FormatterFormat, validate, and minify JSON with clear syntax errors.JSON CompareCompare two JSON payloads and inspect path-level changes locally.JSON SorterSort JSON object keys recursively for deterministic diffs.JSON5 FormatterFormat JSON5 configs with comments, trailing commas, and single quotes.YAML FormatterValidate and format YAML configs without uploading files.YAML to JSONConvert YAML configs into formatted JSON locally.JSON to YAMLConvert JSON objects and arrays into YAML locally.YAML to XMLConvert one-root YAML mappings into formatted XML locally.XML ToolkitFormat, validate, and convert XML to JSON locally.XML MinifierCompact XML payloads locally with parser-error feedback.XML to YAMLConvert XML attributes and repeated tags into YAML locally.JSON to XMLConvert one-root JSON objects into formatted XML locally.CSV to JSONConvert CSV header rows into JSON object arrays locally.JSON to CSVConvert JSON objects into CSV with escaped cells.CSV to YAMLConvert header-row CSV into YAML sequences locally.

Text & web

HTML FormatterFormat or compact HTML snippets with balanced-tag checks.Escape TextEscape and unescape HTML, XML, JSON, CSV, and JavaScript text.URL EncoderEncode or decode URL text and percent escapes in the browser.URL ParserParse URLs into host, path, query parameters, and fragments locally.HTML EscapeEscape or unescape HTML entities for snippets and payload examples.

Developer utilities

HMAC / HashGenerate SHA hashes and verify HMAC webhook signatures locally.Timestamp ConverterConvert seconds, milliseconds, microseconds, and nanoseconds.JWT DecoderInspect JWT headers, payloads, and registered claims locally.Mermaid EditorWrite Mermaid diagrams as code with live SVG/PNG export.

UUID Generator & Validator

Generate UUID v4 or UUID v7 identifiers, validate pasted UUIDs, and inspect version and variant details without uploading data.

Local processingYour input stays in this browser tab.
Random identifiers

Generate UUIDs

Create UUID v4 values for random identifiers or UUID v7 values when sortable timestamp-friendly IDs are useful.

Verifier

Validate pasted UUIDs

Check canonical format, version nibble, variant bits, and normalized lowercase output without calling any backend.

UUID input

Paste a UUID to validate

36 charactersBrowser local

UUID output

Generated UUIDs and validation details

Normalized UUID
550e8400-e29b-41d4-a716-446655440000
Version
Version 4 · random
Variant
RFC 4122 · 10xx
Valid UUID · Version 4 · random

How to use the UUID generator

Choose Generate UUID v4 for random identifiers or Generate UUID v7 when you want timestamp-ordered IDs for logs, events, or sortable records.

Paste any UUID into the verifier to check canonical 8-4-4-4-12 formatting, version nibble, and RFC 4122 variant bits.

UUID v4 vs UUID v7

UUID v4 is random and widely supported. UUID v7 combines a millisecond Unix timestamp with random bits, making generated IDs easier to sort by creation time while keeping enough randomness for distributed systems.

What this UUID Generator does

Use this UUID generator, UUID v4 generator, UUID v7 generator, and UUID validator to create and inspect canonical identifiers for API payloads, database rows, event messages, and test fixtures. The verifier reports version and variant details for pasted UUID values.

When developers use it

  • Generate UUID v4 identifiers for random API test data, database seeds, mocks, and distributed records.
  • Generate UUID v7 identifiers when sortable, timestamp-friendly IDs are useful for events, logs, and queues.
  • Validate copied UUIDs and confirm their version and RFC 4122 variant before using them in fixtures or requests.

Privacy, input, and output

UUID generation and validation run locally in browser memory. PayloadHarbor does not upload generated IDs or pasted identifiers.

Choose UUID v4 or UUID v7 generation, or paste a UUID into the verifier. The output can be copied or downloaded, and validation details include normalized text, version label, and variant bits.

Validation rules and limitations

  • The validator checks canonical UUID syntax, version nibble, and variant bits; it does not prove uniqueness in your database.
  • UUID v7 support depends on this browser-local implementation and may not match older systems that only accept v1 or v4 UUIDs.