Numbers
Random Hash Generator
Used by developers, writers, and creators worldwide.
A random hash generator produces fixed-length strings of hex or alphanumeric characters that look identical to real cryptographic output — SHA-256, MD5, SHA-1 — without hashing any actual input. Developers reach for this when populating test databases, writing API documentation, or building UI prototypes that need authentic-looking tokens and checksums. Three character sets let you match the exact format your system expects: hex for standard crypto output, lowercase alphanumeric for custom token formats, and mixed-case for API key lookalikes. Set the length to 64 for SHA-256, 32 for MD5, or 40 for SHA-1. Generate up to a batch at a time and paste results directly into fixtures, seed scripts, or Postman collections.
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How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Set the Hash Length field to match your target format: 64 for SHA-256, 32 for MD5, or a custom length for your system.
- Choose a Character Set: Hex for standard cryptographic lookalikes, or alphanumeric formats for API keys and custom tokens.
- Enter the number of hashes you need in the count field, then click Generate.
- Copy individual results with the copy button, or select all output to paste directly into your fixtures, docs, or seed file.
Use Cases
- •Seeding a Postgres test database with 200 realistic user session tokens
- •Filling Postman collection examples with plausible Authorization header hashes
- •Mocking SHA-256 commit hashes in internal Git history documentation
- •Generating placeholder API keys for a Storybook component library demo
- •Creating bulk transaction IDs for a payment flow UI mockup in Figma
Tips
- →For Postman mock collections, generate 10–20 hashes at once and paste them as a pre-defined variable list to cycle through during testing.
- →Mixed-case alphanumeric at 48 characters is the closest match to the format used by Stripe, Twilio, and many SaaS API keys.
- →If your system validates hash length strictly, double-check by counting output characters before committing them to fixtures — copy one hash and check its length in a text editor.
- →Pair generated hashes with a timestamp prefix in your seed script to create sortable, realistic-looking identifiers without a UUID library.
- →For documentation screenshots, use a count of 3–5 and hex format at 64 characters — it reads as authentic SHA-256 output to any developer reviewing the docs.
- →When generating database salts for dev configs, use hex format at 32 characters — long enough to look real, short enough to fit in environment variable lines without wrapping.
FAQ
what length and character set should I use to simulate a SHA-256 hash
Set length to 64 and choose the Hex character set. SHA-256 always outputs exactly 64 hexadecimal characters (0–9, a–f). For MD5 use 32, for SHA-1 use 40, and for SHA-512 use 128.
are randomly generated hash strings safe to use as real secrets or tokens
No — these strings are generated in the browser and are not cryptographically secure for production secrets. For real API keys, session tokens, or signing secrets, use a backend library like Node's crypto.randomBytes or Python's secrets module instead.
what is the difference between hex and alphanumeric character sets here
Hex uses only 0–9 and a–f, matching standard cryptographic hash output like SHA-256. Lowercase alphanumeric adds g–z, useful for compact URL slugs or custom tokens. Mixed-case also includes A–Z, matching base62-style API keys common in services like Stripe.