Generate high-entropy API keys with custom prefixes, configurable length, and batch output for test and live environments.
Updated
Quick start
Choose prefix and entropy length to create keys.
Use environment-safe prefixes.
Adjust random body length and count.
Copy generated keys into secure stores.
In-depth guide
Generate prefixed, high-entropy API keys in your browser for local development, staging, and production bootstrap workflows. Use this tool to quickly create policy-aligned key formats before moving secrets into your vault.
Define a predictable structure so generated keys are easy to validate and route in your systems. A practical pattern is prefix + separator + random body, where prefix encodes environment or product context (for example sk_live, sk_test, svc_internal).
Consistent prefixes help with observability, emergency revocation, and support triage because teams can identify key families without exposing full secret values in logs.
Longer random bodies increase brute-force resistance. For most API authentication scenarios, 24-48 random characters generated with a cryptographic browser RNG provide strong practical entropy. If your policy requires fixed lengths, keep environment prefixes constant and vary only the random segment.
When keys are copied through terminals, chat, or dashboards, choose URL-safe characters and avoid ambiguous symbols if human transcription is expected.
Generate in browser, then immediately store secrets in a dedicated manager (for example cloud secret stores or encrypted CI variables). Never commit generated keys to Git, issue trackers, screenshots, or plaintext docs.
Use rotation schedules, one key per integration, and quick revoke paths. If a key appears in logs or support channels, assume compromise and rotate immediately.
When to reach for it. Use it to mint a random, high-entropy API key, token or secret right in the page when you need one quickly.
When something else is better. It generates the value; rotating, storing and scoping the secret in a vault or secrets manager is still your job.
The pitfall to watch. The biggest mistake is pasting a freshly generated secret into chat, a commit or a screenshot — treat it as live the moment it exists.
Everything runs on your device. The values you enter are processed locally in this browser tab — EpitomeTool does not send your input to a server, store it, or log it. That means you can use the tool offline once the page has loaded, and refreshing the tab wipes the slate.
Yes. You can use environment prefixes like sk_test_, sk_live_, or service-specific tags such as billing_ and webhook_.
Random bytes are generated with the browser's cryptographic random source (Web Crypto), not with Math.random.
For most API keys, 24-48 random characters is a practical range. Use your organization's security policy if a minimum entropy or fixed length is mandated.
No. Key generation runs locally in your browser and output stays in the current tab unless you copy it elsewhere.
The randomness is sound — it comes from the Web Crypto API, the same source used for cryptographic operations in the browser. The risk is operational, not the value itself: never paste a generated secret into chat, a commit, a screenshot, or a ticket. Treat it as live the moment it appears, store it in a secrets manager or vault, and scope it to the minimum permissions it needs.
Yes. You can choose character sets and lengths to match common formats — hex for fixed-width tokens, base62/alphanumeric for URL-safe keys, and UUID-style identifiers where a standard shape is expected. Match the format your platform documents so the key validates on the receiving end.
Keep exploring
Hand-picked utilities that pair well with the one you're on — all free, client-side, and zero-signup.
Encrypt and decrypt text locally with AES-256-GCM and passphrase-derived keys.
Generate signed HS256 JWTs from custom header and payload JSON locally.
Generate 6-digit rolling TOTP codes and otpauth URIs from Base32 secrets.
Shrink PDF file size without uploading to a server.
Body Mass Index with metric / imperial inputs and WHO category bands.
Combine multiple PDFs into one in your browser.
Split a PDF by pages or page ranges, download as zip.