URL Encode/Decode

Encode and decode URL. For query strings and API params.

About this tool

This tool encodes and decodes text for URL in one click. Three features: 1) Encode to %XX format, decode to restore, 2) Supports Unicode and special characters, 3) All processing in browser—no data sent to server. Ideal for query strings and API params.

Tool interface

Usage

  1. Enter text in the input field
  2. Click Encode for %XX format or Decode to restore
  3. Use for query strings and API params

When to use

URL query params with Japanese or special chars, building API endpoints, decoding encoded URLs.

Examples

Hello World → Hello%20World, ?q=test+search

FAQ

What is URL encoding?

Converting spaces, Unicode, special chars to %XX for safe use in URLs. Space→%20, etc.

What is percent encoding?

Formal name for URL encoding. % followed by 2 hex digits. Defined in RFC 3986.

How to include Japanese in URLs?

Encode to UTF-8 then %XX. encodeURIComponent() or this tool. Japanese often becomes 3 bytes, e.g. %E3%81%93%E3%82%93...

Difference between + and %20?

+ can mean space in query strings (application/x-www-form-urlencoded). %20 is proper encoding. Both decode to space.

Is URL Encode/Decode free?

Free to use, no sign-up required.

Is data sent to a server?

Data stays on your device; we do not store it on our servers.

Supported browsers?

Tested on recent Chrome, Edge, Firefox, and Safari.

Offline use?

Core features work offline after the first load.

vs CLI or desktop apps?

URL Encode/Decode is an install-free online alternative to CLI or desktop apps.

When to use it?

Use it when: URL query params with Japanese or special chars, building API endpoints, decoding encoded URLs.

Usage example?

Example: Hello World → Hello%20World, ?q=test+search

Main features?

URL encode and decode, Unicode and special chars, Query string conversion

How is this different from similar tools?

URL Encode/Decode runs in the browser with no install—ideal for quick checks before heavier CLI or IDE workflows.

Search keywords

URL, エンコード, 日本語, クエリ, パーセント, URL 変換, URL encode, URL decode, percent encoding, query string converter

Basic workflow

  1. Enter text in the input field
  2. Click Encode for %XX format or Decode to restore
  3. Use for query strings and API params

Practical use cases

  • URL query params with Japanese or special chars, building API endpoints, decoding encoded URLs.
  • This tool encodes and decodes text for URL in one click. Three features: 1) Encode to %XX format, decode to restore, 2) Supports Unicode and special characters, 3) All processing in browser—no data sent to server. Ideal for query strings and API params.
  • URL encode and decode
  • Unicode and special chars

Privacy & data handling

Data stays on your device; we do not store it on our servers.

Things to watch out for

  • Always double-check before pasting output into production
  • Try incognito if extensions break the page
  • Wait for processing on large inputs

Related learning content

Related tools

Tool set

Encode & Convert Set