4629 · Developer Tools · v1.0.0
URL Lab
Take an address apart. Never follow it.
Parse URLs, resolve relative references, inspect repeated query parameters, edit a query key and encode or decode URL components locally.
Text-only workspace. Never executes input. General limit: 200,000 UTF-16 units per editor; some operations have tighter limits.
Private session · history disabled
Opt in to store up to five recent text transformations on this device. Never stored on an account or synchronized. Files are never included. Disable history stops new saves; Clear history deletes saved items.
How to use URL Lab
Paste input, select a command and its options, then run the transformation. Review diagnostics before copying or downloading the result. Input is not executed.
Parsing follows the platform URL standard and can normalize hostnames, default ports or percent encoding. Repeated query keys remain visible. Set replaces every value for one key; Append adds another; Delete removes that key. Percent decoding of components does not turn + into a space; query parsing does. No supplied address is fetched or opened.
Privacy and boundaries
Editor contents stay in your browser. Transformations run in a disposable worker and are never sent to a formatting or AI service. History starts disabled; enabling it writes text to local browser storage only. Clearing that history removes this tool’s saved entries, not data saved by other applications. The surrounding website may load its normal navigation and analytics, but the utility workspace is excluded from content-interaction capture.
Use the labeled operation selector for the available capabilities. Keyboard users can reach every control with Tab; Ctrl or Command plus K opens the command palette. Copy requires clipboard permission. Download creates a local text file. Clear removes the current workspace; it does not automatically delete an opted-in history. Inputs and outputs are always rendered as text, never as a runnable preview.
What is URL percent encoding?
Percent encoding represents bytes as a percent sign followed by two hexadecimal digits. URL components and complete URLs require different handling.