← ToolBox / URL 编码空间占比

🔤 URL Encoding Space Overhead

Estimate the percent-encoding size growth of a URL or query string to anticipate parameter bloat in links.

ASCII 字符数

需编码字符数

空格数

每个非 ASCII/特殊字符编码为 %XX（3 字符）
空格编码为 %20 或 +

用于预估 URL 参数长度。

📚 深度解析：URL 编码空间占比

示例：含 10 个中文的参数

约 30 字节原文编码后约 90 字符，膨胀约 200%（每中文字≈9 字符）。

Item	Formula / Rule	Source / Standard
Unreserved set	66 characters stay literal: A–Z, a–z, 0–9, "-", ".", "_" and "~"	RFC 3986 §2.3 Unreserved Characters
Encoded length	L_out = literal characters + 3 × bytes needing escape	RFC 3986 §2.1 Percent-Encoding
Literal share	Share = unreserved characters ÷ total characters × 100%	WHATWG URL Standard, percent-encode sets