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API Key Generator

Generate prefixed API keys in the format modern providers use.

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Quick Tool Overview

The API Key Generator produces keys in the shape modern providers use: a prefix naming the service and environment, a cryptographically random body, and an optional checksum so a malformed key can be rejected without a lookup.

What it does
Generates prefixed, checksummed API keys
You give it
A prefix, a length and a format
You get back
Keys with their entropy stated
Best for
Designing an API key scheme for your own service
Developer Tools Free, unlimited use No sign-up Runs in your browser

About the API Key Generator

Modern API keys are not just random strings. They carry a prefix identifying the service and the environment — sk_live_, pk_test_, ghp_ — because that is what lets a secret scanner recognise a leaked key in a public repository and revoke it before it is used.

This generates keys in that shape: a prefix you choose, a separator, and a cryptographically random body of the length you set. There is an optional CRC32 checksum suffix, the trick GitHub uses so a key can be validated as well-formed without a database lookup. The entropy of the random part is reported, because that is the only part that provides security — the prefix is metadata, and public.

Key features of the API Key Generator

Prefixes that get keys revoked

A recognisable prefix is what lets a secret scanner spot a leaked key in a public repository and alert you within minutes.

Optional checksum

A CRC32 suffix, the trick GitHub uses, so a typo can be caught locally and scanners get far fewer false positives.

Entropy of the body only

The prefix is public metadata, so the strength figure counts only the random part — which is the honest number.

Provider-style presets

Common shapes such as sk_live and pk_test are one click away, so a new scheme starts from a proven convention.

Storage advice included

The page says to store a hash rather than the key, and to show the key exactly once.

How to use the API Key Generator

  1. 1

    Set the prefix

    Something like sk_live or pk_test, identifying the service and environment.

  2. 2

    Choose the length and alphabet

    The entropy figure updates so you can see what you are getting.

  3. 3

    Add a checksum

    Optional, and lets a key be checked for typos without a lookup.

  4. 4

    Generate and store

    Store only a hash of the key on your server, never the key itself.

Frequently asked questions

So it can be recognised. Secret scanners in GitHub and elsewhere match known prefixes and can alert the provider when a key leaks, which is how a committed key gets revoked within minutes rather than months.

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