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HTTP status codes reference

Search every HTTP status code from 1xx to 5xx with plain-English meanings and when to use each. Filter by category and copy codes. Free.

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About HTTP Status Codes

Look up what any HTTP status code means and when to use it. Search by number or name, filter by category from 1xx informational to 5xx server errors, and read a plain-English explanation of each code, from 200 OK and 301 Moved Permanently to 404 Not Found, 429 Too Many Requests and 503 Service Unavailable. Click a code to copy it.

How to use HTTP Status Codes

  1. 1

    Search by number or name.

  2. 2

    Filter by 1xx, 2xx, 3xx, 4xx or 5xx.

  3. 3

    Read what each code means.

  4. 4

    Click a code to copy it.

Why use this tool

  • Every standard status code.
  • Plain-English explanations.
  • Search and category filters.
  • Click to copy.
  • Useful for API design and debugging.

Frequently asked questions

301 is a permanent redirect that passes SEO value; 302 is temporary.

401 means authentication is required; 403 means the user is authenticated but not allowed.

400 Bad Request, or 422 Unprocessable Content for well-formed but invalid data.

The resource is gone for good, which tells search engines to drop it faster than 404.

A gateway or proxy received an invalid response from the upstream server.

No. Everything is processed in your browser tab. Nothing you type or paste is sent to CodeMites or any other server.

Yes. There is no account, no watermark and no usage limit. The tool runs in your own browser, so there is no server cost to charge you for.

Yes. It runs in any modern browser on Android and iOS as well as on Windows, macOS and Linux, with nothing to install.

Yes, once the page has loaded. Everything runs in your browser, so you can keep working on a train or plane without a connection.

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