Free UUID / GUID Generator – Generate RFC 4122 Version 4 UUIDs
The NexVaani UUID / GUID Generator creates cryptographically secure, standard RFC 4122 Version 4 UUIDs for software engineers and database architects. Generate single UUIDs or batches of up to 500 identifiers with uppercase/lowercase and hyphen options.
The NexVaani UUID Generator produces standard RFC 4122 version 4 universally unique identifiers using the browser-native crypto.randomUUID() API.
Smart 1-Click Workflow Chains (Next Steps):
Real-World Use Cases & Applications
- Generating unique primary keys for PostgreSQL, MySQL, and MongoDB databases.
- Creating distributed tracing IDs (traceparent, request-id) for microservices.
- Generating unique mock IDs for unit tests and seed database fixtures.
NexVaani 工具透明度
处理位置、网络行为和数据保留的技术说明
支持的工具使用客户端技术在浏览器中本地运行。
计算和文本转换均在浏览器本地完成。
临时处理数据由浏览器本地处理，不会存储在 NexVaani。
导出的文件不会添加水印、印章或品牌标识。 Output quality depends on your source file and selected settings.
使用方法 UUID / GUID Generator （分步操作）
Choose Quantity
Select how many UUIDs you want to generate (1 to 500).
Select Formatting
Choose uppercase/lowercase and include or strip hyphens.
Click Generate
Generate cryptographically random UUIDs in browser memory.
Copy UUIDs
Copy individual IDs or copy the full list to your clipboard.
技术架构与执行机制
RFC 4122 Version 4 UUID Collision Probability
A Version 4 UUID contains 122 random bits, yielding 2^122 (approx 5.3 x 10^36) unique values. The probability of generating a duplicate UUID is so infinitesimal that one would need to generate 1 billion UUIDs per second for 85 years to achieve a 50% collision chance.
UUID_v4 = xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx (where y in [8, 9, A, B])技术限制与运行约束
- Generates Version 4 (random) UUIDs. Version 1 (time-based) and Version 5 (namespace SHA-1) are not generated by this tool.
主要规格与功能
- W3C Web Crypto Randomness – Uses crypto.randomUUID() for high collision resistance
- Bulk Generation – Generate up to 500 unique UUIDs in one click
- Format Customization – Toggle uppercase, lowercase, and hyphens (with or without dashes)
- Instant Copy & Export – Copy all IDs to clipboard or download as a text file
常见问题与解答
What is the difference between a UUID and a GUID?
UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) are terms for the same 128-bit identifier standard defined in RFC 4122.
Can two generated UUIDs ever collide?
The chance of a collision with UUID v4 is practically zero (~1 in 2^122).
Are my files uploaded, analyzed, or stored on NexVaani servers?
Where supported, tool inputs and files are processed locally inside your web browser using WebAssembly and HTML5 Canvas. Your files are not uploaded to NexVaani file-processing servers.
评分 UUID / GUID Generator
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