URLEncoder.tools is a free online URL encoder and decoder that converts special characters in URLs to their percent-encoded equivalents as defined by RFC 3986. It supports five encoding modes: Standard URL Encode (encodeURIComponent), Full URL Encode (encodeURI), URL Decode, Batch Mode for multiple URLs, and Form Data Encode. All processing happens client-side in the browser with zero data sent to any server. The tool supports 12 languages and works with Unicode characters including emoji.
免费在线 URL 编码与解码工具
即时编码或解码任何 URL 字符串 — 符合 RFC 3986 标准，在浏览器中运行，不向服务器发送数据。
提示：按 Ctrl+Enter 编码，按 Esc 清除
相关工具
什么是 URL 编码？
URL encoding (also called percent-encoding) is a method of converting special characters in a URL into a format that can be safely transmitted over the internet. It replaces unsafe ASCII characters with a percent sign (%) followed by two hexadecimal digits representing the character's byte value, as defined by RFC 3986.
For example, a space character becomes %20, an ampersand (&) becomes %26, and a question mark (?) becomes %3F. The unreserved characters that do not require encoding are: A-Z, a-z, 0-9, hyphen (-), underscore (_), period (.), and tilde (~).
URL 编码是如何工作的？
URL encoding works by converting each character to its UTF-8 byte sequence, then representing each byte as a percent sign followed by two hexadecimal digits. Single-byte ASCII characters like a space produce one percent-encoded triplet (%20), while multi-byte Unicode characters produce multiple triplets.
RFC 3986 divides characters into two groups: reserved characters (: / ? # [ ] @ ! $ & ' ( ) * + , ; =) that have special meaning in URL syntax, and unreserved characters (A-Z, a-z, 0-9, -, _, ., ~) that can appear in URLs without encoding. Reserved characters must be percent-encoded when used as data rather than as delimiters.
什么时候需要对 URL 进行编码？
当 URL 包含空格、和号 (&)、等号 (=) 或非 ASCII 字符等特殊字符时，您需要对 URL 进行编码。常见场景包括：为 API 调用构建查询字符串、编码表单数据以便提交、在电子邮件或消息中分享包含特殊字符的 URL，以及处理国际化域名。
Query Strings & API Calls
When building REST API requests, query parameters containing special characters like &, =, or spaces must be percent-encoded to avoid breaking the URL structure.
Form Data Submission
HTML forms submitted via GET method encode field values as query parameters. Spaces become + or %20, and special characters are percent-encoded.
Email & Messaging Links
URLs shared in emails or chat messages often contain special characters that need encoding to remain clickable and functional.
JavaScript fetch() & AJAX
When constructing URLs dynamically in JavaScript, always use encodeURIComponent() for parameter values to prevent XSS and malformed requests.
常见的 URL 编码字符
| Character | Encoded | Unicode |
|---|---|---|
| (space) | %20 | U+0020 |
| ! | %21 | U+0021 |
| # | %23 | U+0023 |
| $ | %24 | U+0024 |
| & | %26 | U+0026 |
| + | %2B | U+002B |
| , | %2C | U+002C |
| / | %2F | U+002F |
| : | %3A | U+003A |
| ; | %3B | U+003B |
| = | %3D | U+003D |
| ? | %3F | U+003F |
| @ | %40 | U+0040 |
| [ | %5B | U+005B |
| ] | %5D | U+005D |
各编程语言中的 URL 编码
JavaScript
encodeURIComponent('hello world')
// → "hello%20world"
decodeURIComponent('hello%20world')
// → "hello world"
encodeURI('https://example.com/search?q=hello world')
// → "https://example.com/search?q=hello%20world"Python
from urllib.parse import quote, unquote
quote('hello world')
# → "hello%20world"
unquote('hello%20world')
# → "hello world"PHP
urlencode('hello world');
// → "hello+world"
rawurlencode('hello world');
// → "hello%20world"
urldecode('hello%20world');
// → "hello world"Java
URLEncoder.encode("hello world", "UTF-8");
// → "hello+world"
URLDecoder.decode("hello+world", "UTF-8");
// → "hello world"C#
Uri.EscapeDataString("hello world");
// → "hello%20world"
Uri.UnescapeDataString("hello%20world");
// → "hello world"Ruby
require 'uri'
URI.encode_www_form_component('hello world')
# → "hello+world"
URI.decode_www_form_component('hello+world')
# → "hello world"常见问题
哪些字符需要进行 URL 编码？
需要 URL 编码的字符包括空格、特殊字符（如 &、=、?、#、%）以及所有非 ASCII 字符。不需要编码的非保留字符为：A-Z、a-z、0-9、连字符 (-)、下划线 (_)、句点 (.)、波浪号 (~)。
URL 中 %20 和 + 有什么区别？
%20 表示 URL 路径中的空格，是标准的百分比编码。+ 号仅在使用 application/x-www-form-urlencoded 格式时在查询字符串参数中表示空格。
URL 编码和 Base64 编码是一样的吗？
不是。URL 编码将 URL 中的特殊字符转换为 %XX 十六进制格式。Base64 编码将二进制数据转换为使用 64 个可打印 ASCII 字符的文本字符串。它们用途完全不同。
如何在 JavaScript 中解码 URL？
使用 decodeURIComponent() 解码 URL 组件，或使用 decodeURI() 解码完整 URL。例如：decodeURIComponent('%20') 返回一个空格字符。
什么是 RFC 3986？
RFC 3986 是定义统一资源标识符 (URI) 语法的标准。它指定了 URL 中允许哪些字符，以及特殊字符应如何进行百分比编码。
为什么我的 URL 中有 %3D 和 %26？
%3D 是等号 (=) 的 URL 编码形式，%26 是和号 (&) 的编码形式。这些字符在 URL 中有特殊含义，因此当它们作为数据值使用时必须进行编码。
了解更多关于 URL 编码的信息
阅读我们关于 URL 编码最佳实践的深入指南和教程。
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