UUID Generator

Generate unique UUID identifiers online, with support for batch generation, case conversion, delimiter control, and more.

Bug report

Browser execution mode: Your data is processed in your browser and is not uploaded to the server.

Speed and Stability: Processing speed depends on your device and browser. For large batch work, the desktop version may be more stable.

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If the online tool fails to load or run, try the desktop tool.https://tools.yikeaigc.com/

Tool Usage

Return to old version

Set version, count, case, and separator first, then click Generate. For simple tasks, use the default settings.

UUID version

v4 is for random IDs, v7 is time-sortable, and v5 is stable from a namespace and name.

Basic settings Bulk generation limit: 10000

Quantity

Separator format

Letter case

Output separator

v5 namespace

Choose a preset namespace, or enter a standard UUID as a custom namespace.

Namespace

Custom namespace UUID

Name list

v5 mode generates by name lines; if there are fewer names than the count, numbers are added automatically.

Extra format Keeps naming consistent with existing system fields

Prefix

Suffix

Timestamp prefix

Deduplicate batch Auto-generate after settings change

UUID validation and conversion

Paste an existing UUID to check its version and variant, then convert it to the current format.

Content to validate

Generated results Complete settings first, then generate or convert UUIDs.

Copied

0Count

-Version

-Format

-Time

Common use tips Results are generated in the browser and can be used after copying or export

Database primary keyPrefer v4 or v7; v7 is easier to sort by write time.

APIs & LogsAdd a prefix to distinguish modules, or export as TXT or CSV.

Stable MappingThe same namespace and name generate the same v5 UUID.

Format CompatibleSupports standard, no hyphens, braces, URN, uppercase, and lowercase.

Instructions

Software Usage Instructions

Select UUID version: In the settings, choose UUID v4, UUID v7, or UUID v5. v4 is suitable for random identifiers, v7 is suitable for time-ordered records, and v5 is suitable for generating fixed results based on a namespace and name.
Set generation quantity and format: Enter the number you need to generate, choose standard hyphenated, hyphen-free, braces, or URN format, and set lowercase or uppercase.
Configure output method: You can choose one per line, comma, semicolon, space, or JSON array output, making it easy to paste into code, spreadsheets, or API parameters.
Configure advanced options:
- Prefix/suffix: Add business tags to the generated results, such as user_, order_, etc.
- Timestamp prefix: You can add a base36 millisecond timestamp or ISO time.
- Deduplicate within batch: When generating random UUIDs, check whether duplicates exist within the current batch.
Use UUID v5: Select DNS, URL, OID, X.500, or a custom namespace, and enter one name per line in the name list. The same namespace and name will generate the same UUID.
Validate and convert: After pasting an existing UUID, you can validate its version, variant, and format, and also convert it to standard, hyphen-free, braces, or URN format according to the current settings.
Generate and export: After clicking “Generate UUID”, you can copy all results or export a TXT or CSV file.

FAQ

A: UUID v4 is generated based on random numbers and is suitable for general-purpose identifiers; UUID v7 contains millisecond time information and is suitable for logs, events, and data that needs to be sorted by time; UUID v5 generates fixed results based on a namespace and name, making it suitable for stable mappings.

A: Yes. The hyphen-free format is a 32-character hexadecimal string, and many database fields, API parameters, and configuration files support this format. It is recommended to confirm the target system requirements before actual use.

A: UUID v5 calculates a digest using both the namespace UUID and the name, then sets the UUID version bits and variant bits. Therefore, when the namespace and name remain unchanged, the generated result remains the same.

A: The probability of duplicates for UUID v4 and v7 is very low. The tool also provides an intra-batch deduplication option to check the current generated batch. UUID v5 is a fixed mapping, so the same input will naturally generate the same result.

A: The URN format is often used in text or protocols that need to clearly identify the UUID resource type; the brace format is common in some legacy systems, configuration items, or development frameworks. Standard database fields generally use the standard hyphenated format or the hyphenless format.

A: A timestamp prefix is an extra string added outside the UUID, making it easier for humans to identify or to perform simple sorting; UUID v7 includes time information within the UUID structure, making it more suitable for scenarios where the UUID format needs to be preserved.

A: TXT is suitable for direct copying into code, configurations, or text lists; CSV includes the sequence number, UUID, version, and format information, making it suitable for organizing, filtering, and archiving in spreadsheet software.