Numbers
An API key is a unique token used to authenticate requests to web services and APIs. This API key generator creates random keys in the most common real-world formats — hex strings for cryptographic use, alphanumeric keys for general APIs, prefixed keys like Stripe-style tokens, and segmented keys for human-readable distribution. Whether you are building a SaaS product, setting up webhook authentication, or creating developer sandbox tokens, this tool generates keys that match industry conventions instantly, with no server interaction.
There is no universal standard, but hex strings (32-64 chars) and alphanumeric tokens (32 chars) are most common across major APIs.
Prefixes like sk_live_ or pk_test_ are used by services like Stripe to indicate key type and environment at a glance.
They are randomly generated with good entropy, but for production systems always store keys securely and consider server-side generation.
Yes — enter any prefix in the custom prefix field and select the prefixed format to match your brand or naming convention.