Free API Key Generator that works offline
Create high-entropy test or application tokens without sending generated secrets to a server.
What this api key generator does
Secure keys need unpredictable random bytes and enough entropy. Encoding changes appearance but not the underlying randomness, while prefixes can identify the key type without reducing the random portion.
How to use the API Key Generator
- Enter or paste the desired key format, random byte length and optional prefix into the tool.
- Adjust the available options so they match the format and result you need.
- Choose Generate API keys and review one or more cryptographically random token strings before using it.
- Copy or download the result, then clear the page if the input was sensitive.
Common uses
- Creating development API tokens
- Generating webhook secrets
- Preparing local test credentials
- Designing prefixed key formats
Private processing and offline access
This tool does not submit your input to a conversion server. Processing takes place inside the browser using local JavaScript and standard Web APIs. After the PWA has been installed or cached, the page and its core features remain available without an internet connection. Closing or clearing the page removes unsaved input; the tool does not create an account or cloud history.
Tips for accurate results
- Store production keys in a proper secret manager.
- Do not recover a lost generated key from browser history because none is saved.
- Use at least 16 random bytes and preferably 32 for long-lived secrets.
Frequently asked questions
Does this tool upload my data?
No. API Key Generator processes its input in the current browser and does not submit it to a conversion API.
What input does the API Key Generator accept?
Hexadecimal, Base64URL and custom alphabets of at least two unique characters are supported. Random bytes come from Web Crypto.
Can I use this tool offline?
Yes. Once the Offline Tools PWA has cached the page, the core feature works without an internet connection.