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Free Online UUID / GUID & Hash Calculator
Software developers, database administrators, and QA engineers regularly require unique identifiers and cryptographic hash digests for microservices, API payload tracking, database primary keys, and data integrity verification. A UUID (Universally Unique Identifier) Version 4 provides a virtually collision-free 128-bit key generated through cryptographically secure pseudo-random numbers.
The TechTools UUID & Hash Generator runs entirely within your client browser using the modern, hardware-accelerated Web Crypto API. Generate bulk batches of UUID v4 keys with custom hyphenation and JSON formatting, or compute instant SHA-256, SHA-512, and MD5 hash signatures without ever sending your sensitive tokens across the internet.
How to Generate UUIDs & Cryptographic Hashes
- Select Your Desired Mode: Choose between the UUID / GUID Generator tab or the Hash Calculator tab.
- Configure UUID Output: For UUIDs, pick the batch quantity (from 1 up to 100), toggle uppercase letters, remove hyphens, or choose JSON array format.
- Compute Real-Time Hashes: For hashing, simply type or paste your text string. SHA-256, SHA-512, MD5, and SHA-1 hashes calculate automatically with zero latency.
- Copy or Download: Tap the Copy button or download your batch as a plain
.txtfile for direct import into database seed scripts.
Key Benefits for Engineers & DevOps Teams
- RFC 4122 Standard Compliant: Generates authentic, standard-compliant Version 4 UUIDs using the browser's cryptographically secure
crypto.randomUUID()engine. - Zero Server Transmission: Absolute privacy guaranteed. All hashing operations execute locally in your device memory—ideal for sensitive API keys and internal password tests.
- Bulk Batch Export: Produce up to 100 unique UUIDs at once with formatted quotes and braces for SQL, Python, or JavaScript insertion.
- Multi-Algorithm Digest Support: Compare SHA-256, SHA-512, SHA-1, and MD5 side-by-side with 1-click clipboard copying.
Frequently Asked Questions (FAQ)
Can two UUID v4 values ever collide or be identical?
The total number of possible UUID v4 values is 2^122 (approximately 5.3 x 10^36). To have a 50% probability of a single collision, one would need to generate roughly 1 billion UUIDs every second for approximately 85 years. For all practical software applications, they are universally unique.
What is the difference between a UUID and a GUID?
GUID (Globally Unique Identifier) is Microsoft's implementation of the broader UUID (Universally Unique Identifier) standard specified by RFC 4122. In modern software engineering, the terms are used interchangeably and follow the same 32-hexadecimal-digit format.
Is MD5 secure for password storage?
No. MD5 is vulnerable to collision attacks and should never be used for password hashing in production. For password storage, modern salted algorithms like bcrypt or Argon2 are recommended. SHA-256 and SHA-512 are suitable for data integrity checks and token hashing.