URL Parser

URI（Uniform Resource Identifier） It is a unified resource identification code, which is the top-level concept and is used to uniquely identify a resource.
URL（Uniform Resource Locator） It is a Uniform Resource Locator that not only identifies the resource, but also tells you how to get it (via network location).
URN（Uniform Resource Name） Is a unified resource name that only identifies the resource but does not provide location information.

Simply put,All URLs are URIs, but not all URIs are URLs. For example https://example.com/page is both a URI and a URL, and urn:isbn:0-486-27557-4 Is a URI but not a URL.

Query String to ? Beginning with & Delimited key-value pairs (such as ?name=gary&id=123). Query String willSend to server, commonly used for search parameters, filter conditions, paging information, etc.

Fragment (fragment identifier) to # at the beginning,Will not be sent to the server, only used on the browser side. Commonly used for page internal anchors (jumping to specific blocks), SPA routing status, etc.

Example:
https://example.com/page?query=hello#section-2
• ?query=hello → Server receives
• #section-2 → Browser use only

TLD (Top-Level Domain, top-level domain) is the last part of the domain, such as .com、.org、.tw、.co.uk Wait. Managed by ICANN.

Second Level Domain is the previous part of the TLD, usually the main name of the website. For example example in example.com in.

Subdomain It is the part before the second-level domain and is used to divide different service areas. For example blog in blog.example.com in,api in api.example.com in.

for blog.example.co.uk：
• Subdomain: blog
• Domain: example
• TLD: co.uk

Port is a numerical label used to distinguish different services in network communications, ranging from 0 to 65535. When Port is not specified in the URL, the browser will useDefault port number：
• HTTP：80
• HTTPS：443
• FTP：21
• SSH：22

For example https://example.com:8080/path in 8080 It is a non-standard port number, often used for test servers in the development stage. Non-standard port numbers need to be specified explicitly in the URL.

The format of Username and Password in the URL is https://user:pass@host/, a URL encoding method belonging to HTTP Basic Authentication. In the early days, it was often used by browsers to directly transmit authentication information.

⚠️ Security risks:
• Passwords are displayed in plain text in the URL and can be easily eavesdropped or leaked.
• URLs may be recorded in browser history, server logs, Referer headers, etc.
• Modern browsers have phased out password authentication in URLs.

Suggestions: Do not include authentication information in the URL, use the Authorization header or cookies for authentication instead.

URL Encoding (also known as Percent-Encoding) is to convert special characters in the URL to % A mechanism followed by two digits of hexadecimal code. This is because some characters in the URL have special meanings (such as ? Start Query String,# Start Fragment), if you need to use literal values in these parts, you must encode them.

Common encodings:
• 空格 → %20
• # → %23
• ? → %3F
• & → %26

The browser will automatically encode the URL, which is why when you paste a URL containing Chinese characters in the address bar, you will see %E4%B8%AD%E6%96%87 Such form.

Not at all. This tool isPure front-end application, all URL parsing, domain analysis, and health checks are done locally in your browser, and no data is sent to the server. Works even when offline, so feel free to use any sensitive URLs.