HTTP Status Codes

How HTTP Status Codes works

Look up any HTTP status code by number or by name. A searchable list of the codes you actually meet in logs, APIs and browser dev tools. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

The five families

The first digit tells you who is responsible. 1xx is informational, 2xx success, 3xx redirection, 4xx a client error, 5xx a server error. That single rule answers most “what does this code mean” questions before you look it up.

The tool lists the codes that actually appear in practice rather than all sixty-odd registered ones.

The ones that change SEO

301 passes ranking signals, 302 does not, 410 tells a crawler to drop the URL faster than 404, and 503 with Retry-After is the correct way to say “temporarily down” without losing your rankings.

A 200 returned for a missing page — the soft 404 — is the most damaging because nothing signals a problem at all.

Reading them in logs

A spike in 429 means rate limiting, 499 is nginx's “client closed request” and does not exist in the HTTP spec, and a page of 304s is healthy caching rather than an error.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions