URL Encoder / Decoder

Encode text/URLs for safe use in query strings, or decode a percent-encoded URL back to plain text

Encoding text for safe inclusion in a URL query string, or decoding a percent-encoded URL back to plain text, solves a specific problem: URLs can only safely contain a limited set of characters, and anything outside that set — spaces, certain punctuation, non-ASCII characters — needs to be represented using percent-encoding to travel safely through a URL without being misinterpreted or corrupted.

Why URLs can't contain arbitrary characters directly

The URL specification reserves certain characters for structural purposes (like "/", "?", "&", and "=", which separate different parts of a URL) and restricts the general character set to a safe subset that every browser, server, and intermediate system reliably handles the same way. Any character outside that safe set — including a literal space, many punctuation marks, and non-ASCII characters like those in Urdu text — gets represented instead as a percent sign followed by the character's hexadecimal byte value, a transformation that makes the character safe to include without it being confused for a structural URL delimiter or corrupted by a system that doesn't handle the original character correctly. This is a related but genuinely different encoding scheme from Base64 encoding, which solves a different problem (safely representing arbitrary binary data as text) using a different transformation method entirely.

A worked example

A search query or form value containing spaces or special characters needs those specific characters percent-encoded before being safely appended to a URL — passing the raw, unencoded text directly into a URL query string risks the browser or server misinterpreting where one parameter ends and another begins, or simply failing to parse the URL correctly at all.

How this connects to your other technical tools

URL encoding and Base64 encoding are both "make this safe to include somewhere it otherwise couldn't go" transformations, but for different contexts and using different specific methods — the Base64 Encoder/Decoder handles the general text-safe-transport case, while this calculator handles the URL-specific case with its own reserved-character rules.

Common mistakes

Assuming URL encoding and Base64 encoding are interchangeable, or that either one provides any security or privacy protection, is a common misunderstanding — both are purely format transformations for specific transport contexts, fully and trivially reversible by anyone, and neither should be relied on for anything requiring actual confidentiality.