# HTTP Status Code Reference

> Look up what any HTTP status code means and when to use it.

To look up an HTTP status code, type the number or a keyword. Each entry explains what the code means and when it applies, including the difference between 301 and 302 redirects and why 401 is about authentication rather than authorisation.

**URL:** https://convertto.tech/t/http-status-codes
**Category:** Developer Tools (https://convertto.tech/c/developer-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Enter or paste your filter.
2. The result appears immediately — copy or download it.

## FAQ

### When should I use 301 versus 302?

Use 301 when a URL has permanently moved — search engines transfer ranking signals to the new URL and browsers cache the redirect. Use 302 for temporary moves such as A/B tests or maintenance pages.

### What is the difference between 401 and 403?

401 means you are not authenticated — log in and try again. 403 means the server knows who you are and is still refusing. Confusingly, 401 is named "Unauthorized" but is about authentication.

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