Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.
Query String Builder
Build and parse URL query strings.
FreeRuns in browserquery string builderurl parameters
Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result
About Query String Builder
Build and parse URL query strings online for free. Convert key-value pairs into encoded query parameters or break existing query strings into readable format. Handles Unicode text correctly, including emoji and multi-byte characters. Processes text instantly in your browser with no practical size limits. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.
Related tools: URL Parser, URL Encode / Decode, URL Slug Generator
How to Use Query String Builder
- Paste or type your text into the input area.
- Select the transformation you want to apply.
- Copy the transformed result from the output area.
Frequently Asked Questions
What is Query String Builder?
Build and parse URL query strings online for free. Convert key-value pairs into encoded query parameters or break existing query strings into readable format.
Does the tool preserve formatting?
The tool preserves whitespace, line breaks, and structural formatting while applying the selected transformation. Only the targeted text characteristics are changed, leaving your overall layout intact.
Can I process large texts?
Yes, because all processing happens in your browser there are no server-imposed size limits. Performance remains fast for texts up to several hundred thousand characters on modern devices.
What character encodings are supported?
The tool handles Unicode text correctly, including emoji, accented characters, and multi-byte scripts such as Chinese, Japanese, and Arabic. Any text that your browser can display can be transformed.
Is Query String Builder free to use?
Yes, this text tool is entirely free. There is no signup, no account required, and no limit on how much text you can process.
Is my data safe when using Query String Builder?
Yes, all text processing happens locally in your browser. Your text is never sent to any server, so your content remains completely private and secure.