API Key Validator
Validate API key format and detect the provider instantly in your browser. Supports OpenAI, Stripe, GitHub, AWS, Google, Anthropic, HuggingFace, Slack, SendGrid, Twilio, and more. Includes entropy analysis.
How to Use API Key Validator
How to Use the API Key Validator:
Paste Your Key: Copy your API key and paste it into the input field. Use the Show/Hide toggle to reveal or mask the key while you work.
Click Validate Format: Press the "Validate Format" button to run the analysis. No data is sent anywhere — everything runs in your browser.
Read the Results:
- Provider — The detected service (e.g. OpenAI, Stripe, GitHub) based on prefix and format patterns.
- Key Type — The specific key subtype if detectable (e.g. "Secret Live", "Project", "Fine-grained PAT").
- Format Match — Whether the key exactly matches the expected pattern for its provider ("Exact Match"), only matches the prefix ("Prefix Only"), or is unrecognised ("Unknown").
- Length — Total character count of the key.
- Entropy — Shannon entropy per character. High entropy (> 4 bits/char) indicates good randomness. Low entropy may signal a truncated, sequential, or non-random key.
- Character Set — The types of characters used (alphanumeric, hex, base64url, etc.).
Review Warnings: Any structural issues (very short key, low entropy, prefix-only match) are highlighted as warnings.
Supported Providers
- OpenAI (sk- / sk-proj- / sk-svcacct-)
- Anthropic / Claude (sk-ant-)
- Stripe (sk_live_ / sk_test_ / pk_live_ / pk_test_ / rk_ / whsec_)
- GitHub (ghp_ / gho_ / ghs_ / ghr_ / github_pat_)
- AWS (AKIA / ASIA Access Key IDs)
- Google Cloud (AIza)
- Hugging Face (hf_)
- Slack (xoxb- / xoxp- / xoxa- / xapp-)
- Twilio SendGrid (SG.)
- Twilio (AC / SK Account SIDs)
- Mailgun (key-)
- PlanetScale (pscale_tkn_)
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