Stateless Tools

Base URL

Output URL

Guide

URL query builder workflow

Encode key-value pairs safely for search URLs, share links, and API test query strings.

Reduce encoding mistakes

Encode spaces, Korean text, and special characters according to URL rules instead of concatenating strings manually.

Assemble test links

Build filters, page numbers, sorting values, and other parameters in one place to reproduce API or screen states.

Review before copying

Check required parameters and empty values before copying the final URL.

More: how to use it, examples, and common errors

Workflow

How to use it

Enter a base URL or prepare to build only the query string.
Add parameter names and values row by row.
Review the generated URL for correct separators and encoded values.
Remove unnecessary empty values before using it in analytics tools or API tests.

Examples

Real input and output

Basic parameters

Input

base   https://api.example.com/search
q      developer tools
page   2

Output

https://api.example.com/search?q=developer%20tools&page=2

A value containing special characters

Input

redirect  https://example.com/back?id=1&t=2

Output

redirect=https%3A%2F%2Fexample.com%2Fback%3Fid%3D1%26t%3D2

The & and = inside the value must be encoded or the parameter list breaks apart.

Troubleshooting

Errors you will hit

Is a space + or %20?

Both usually decode to a space in a query string, but in a path a + is a literal plus. Servers differ, so %20 is the safer choice.

Array parameter styles

tags=a&tags=b, tags[]=a&tags[]=b, and tags=a,b are all in use. Which one works depends on the server framework — check the API docs first.

Review

Things to check

Repeated keys vary

Servers can interpret repeated keys differently. Match array parameter rules with the API documentation.

Avoid sensitive data

URLs can appear in browser history, logs, and previews. Avoid putting tokens or personal data in query strings.

URL Query Builder