URL Encoder & Decoder

Web Tools

Encode special characters into percent-encoded URI strings and parse URL query parameters.

Standard:

Spaces:

Presets:

Raw URL / String Input205 chars

Encoded Result

https%3A%2F%2Fauth.techtube.dev%2Foauth%2Fv2%2Fauthorize%3Fresponse_type%3Dcode%26client_id%3Dapp_88192%26redirect_uri%3Dhttps%253A%252F%252Ftechtube.dev%252Fcallback%253Fsource%253Dgoogle_auth%26scope%3Dread%253Auser%2520write%253Adata%26state%3Dxyz_9910

Client-Side Privacy Guarantee

100% Private & Client-Side: All URL processing and parameter parsing is performed strictly within your browser. No web addresses or parameters are logged or sent to any server.

What is this?

A comprehensive web utility for encoding text and URLs into percent-encoded format (RFC 3986) and decoding encoded query parameters back to human-readable strings. Features a built-in visual Query Parameter Inspector that breaks down complex URLs into an editable Key-Value parameter table.

Key Features & Concepts

Percent-Encoding & Decoding: Convert spaces, symbols, and non-ASCII characters into %XX format
Dual Standards Support: Choose between encodeURIComponent (all non-alphanumeric) and encodeURI (preserves full URL structure)
RFC 3986 Space Handling: Toggle between standard %20 encoding and form-style + encoding for spaces
Visual Query Parameter Inspector: Parses full URLs into an interactive Key-Value table for quick debugging
Live Key-Value Editor: Edit, add, or remove query parameters and rebuild the encoded URL in real time
One-Click Copy & Clear: Instantly copy encoded/decoded output or reset the editor
Error Handling: Gracefully reports malformed URI percent-sequences with exact position markers
100% Client-Side Execution: All URL parsing and encoding runs locally inside your browser

How to Use

Select "Encode" or "Decode" mode from the mode switcher.
Paste a full URL or raw string into the input field.
Choose your encoding mode: encodeURIComponent (for query values) or encodeURI (for full web addresses).
Use the Query Parameter Inspector tab to view and edit URL key-value pairs in a tabular interface.
Click "Copy Result" to copy the processed string to your clipboard.

Common Use Cases

Frontend Engineers constructing dynamic URL query strings for API requests
Marketing & SEO Specialists analyzing and building campaign URLs with UTM parameters
Web Developers debugging OAuth redirects, deep links, and webhook endpoint URLs

Practical Examples

Encoding spaces and special characters in query values: "TechTube Tools & Utility" -> "TechTube%20Tools%20%26%20Utility"
Decoding complex OAuth callback URLs containing encoded redirect URIs and state strings
Inspecting tracking parameters (utm_source, utm_medium) in marketing links

Limitations & Technical Notes

URLs must adhere to standard URI character specifications (RFC 3986).
Decoding malformed percent sequences like "%2" or "%ZZ" will trigger a URIError message.

Frequently Asked Questions

Why do URLs need to be encoded?

URLs can only contain printable ASCII characters from a specific allowed set. Reserved characters like "?", "&", "=", "#", and spaces have special structural meanings in URLs and must be percent-encoded when used inside parameter values.

What is the difference between encodeURI and encodeURIComponent?

encodeURI preserves special URL characters like ":", "/", "?", and "#" so that full web addresses remain intact. encodeURIComponent encodes ALL non-alphanumeric characters, making it ideal for individual query parameter values.

Why are spaces encoded as %20 or +?

Standard percent-encoding uses %20 for spaces according to RFC 3986. HTML form submissions (application/x-www-form-urlencoded) historically used the "+" sign for spaces.

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