> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tuturuuu.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Tools

> Public QR and random utilities with stable canonical URLs.

Tools (`tools.tuturuuu.com`, `apps/tools`) serves public, lightweight web
utilities. It uses stable URLs without locale prefixes; language preferences
can change copy on the same canonical path.

| Tool | Canonical path | Guide |
| - | - | - |
| Directory | `/` | Tool selection |
| QR generator | `/qr` | [QR](/platform/applications/qr) |
| Random utilities | `/random` | Options provided by the current random tool UI |

The public sitemap lists only these three paths on the Tools host. Old main-site
QR aliases redirect to the canonical product destination where configured;
they must not be published as duplicate pages with unrelated canonicals.

Page-specific metadata names the actual utility. URLs such as `/vi/qr` and
`/en/qr` are redirect aliases, not distinct indexed translations. Do not emit
hreflang alternates when the app serves only one stable URL per page.

The utility input is separate from its public explanatory metadata. Avoid
placing user-entered text or private data into canonical URLs, search schemas,
or static sitemap entries. Authentication and API paths are excluded by the
shared indexing policy.

[Tools routes](/reference/repository/routes/tools) and
[SEO strategy](/build/development-tools/seo-strategy) describe implementation
and public-discovery expectations.


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