URL Query Builder

Build and inspect a query string parameter by parameter.

Free
No signup
Nothing uploaded
No watermark

URL

Parts

protocol: https
host: example.com
hostname: example.com
port: 443 (default)
path: /blog/article
query: b=2&a=1&utm_source=newsletter&fbclid=abc
hash: section
origin: https://example.com

Parameter	Value	Decoded
b	2	2
a	1	1
utm_sourcetracking	newsletter	newsletter
fbclidtracking	abc	abc

2 tracking parameter(s) found — these identify the campaign that sent you, not the page.

The fragment after # is never sent to the server. It is handled entirely in the browser.

How to Use the URL Query Builder Online

Builds and inspects a query string parameter by parameter. Encoding each value separately is the part that matters — a value containing an ampersand or an equals sign will split the parameter in two if it is not encoded first.

No software to install Free Works on any device

Step-by-Step Guide to Using the URL Query Builder

1

1. Type or paste your value into either box
2

2. The conversion runs both ways as you type — there is no button to press
3

3. Copy whichever form you need

Try it now

What is the URL Query Builder?

Why Use Web Development Tools in the Browser?

Small web jobs like minifying CSS, checking HTML, escaping a string or writing a Dockerfile rarely deserve a new install. These tools do each one in a tab, and your code is never sent to a server.

“The fastest tool is the one already open in a tab.”

Code checked for errors
Messy code made readable
Number bases converted
Selectors and paths tested

Minified files for faster pages
Config files from templates
CI workflows drafted quickly
Source code stays private

Popular Uses for Developer Utilities

These are the small tasks that interrupt a day of web work.

Minifying assets Shrink CSS or JSON before deploying, then beautify it again to read.
Validating markup Catch unclosed tags and syntax errors in HTML, CSS or JavaScript before publishing.
Docker setups Draft a Dockerfile, Docker Compose file or .dockerignore for a new project.
CI pipelines Generate a GitHub Actions or GitLab CI workflow and adjust it to fit.
Number conversions Convert between binary, decimal, hex and octal while reading low-level data.
Selector testing Try a CSS selector or JSONPath expression against sample input and see matches.
Data URIs Turn a small image into a data URI to embed directly in CSS.
Project files Create .gitignore, EditorConfig and CODEOWNERS files without copying them from old repos.

What You Can Do with the URL Query Builder

Generation happens on your own machine, at your machine's speed

Follows the WHATWG URL rules, which is what a browser and a server will actually apply

Query parameters are shown decoded and in order, so a broken link is readable

Why Use ToolXkit for URL Query Builder?

Your files stay with you

Everything runs inside your browser. Nothing you open or type is uploaded to a server.

Web Dev Tools for Different Users

Front-end developers

Validate, minify and beautify HTML, CSS and JavaScript as part of daily work.

DevOps engineers

Draft Docker, cron and CI files quickly, then refine them in the repo.

Coding students

Learn number systems, escapes and selectors by trying examples and seeing results.

Technical writers

Escape code samples and check snippets before putting them into documentation.

QA testers

Write clear bug reports and test CSS selectors against real page markup.

Open source maintainers

Set up issue templates, CODEOWNERS and gitattributes for a shared project on GitHub.

Best Times to Validate or Minify Code

Keep these open in a tab when you are:

Starting a new repository
Preparing a site for launch
Tracking down a syntax error
Containerising an app
Setting up automated builds
Reading hex or binary values
Writing a bug report
Working on a locked-down laptop

Frequently Asked Questions

Answers to common questions about this tool.

Do I need to install anything to use the URL Query Builder?

No. URL Query Builder runs entirely in your browser — there is nothing to download, no extension and no desktop program. It works the same on Windows, macOS, Linux, Android and iPhone.

Is it safe to use the URL Query Builder online?

Safer than the usual alternative, yes. Most online tools upload your file to a server you know nothing about, where it sits until someone deletes it. Here the file never leaves your device — the processing happens in the page itself, so there is no server copy to leak, retain or sell.

Is my code sent to a server when I use URL Query Builder?

No. Your code is processed in the browser tab, so private repositories, keys in config files and client work stay on your machine. It also means the tool works on locked-down work laptops where installing software is not allowed.

Will minifying break my code?

Minifying removes spaces, comments and line breaks without changing what the code does. Keep an unminified copy for editing, and test the minified version before deploying it.

Are the generated config files ready to use?

They give you a sound starting point based on common settings. Every project is different, so read through the file and adjust paths, versions and secrets before committing it.

Is URL Query Builder free with no account?

Yes. There is no login, API key or usage cap. Open the page whenever you need it, even on a machine that is not your own.

Does URL Query Builder follow current web standards?

The validators and generators follow current web standards and common tool conventions. Standards keep moving, so for edge cases check MDN or the official specification listed in further reading.

More Web Development Tools

Other free tools for the same kind of job.

Browse all tools