URL Decoder
Decode percent-encoded (%20, %3A, %2F) URLs and query strings back into readable plain text.
How the URL Decoder works
Decode percent-encoded (%20, %3A, %2F) URLs and query strings back into readable plain text. Below is the exact mathematical or algorithmic model used by this encoding utility, along with its key operating assumptions.
Converts %HH hex sequences and '+' spaces back into UTF-8 characters via decodeURIComponent().Step-by-step workflow
- Paste or type your input string, payload, or expression into the URL Decoder editor.
- Your browser executes Converts %HH hex sequences and '+' spaces back into UTF-8 characters via decodeURIComponent(). locally using native Web APIs without transmitting data over the network.
- Inspect validation diagnostics, byte/character metrics, or formatted output and copy the result in one click.
Worked example & key advantages
Paste an encoded redirect URL or analytics query string to read the clean target URL.
Why use this URL Decoder tool
- Zero-telemetry local execution—safe for formatting production JSON payloads, tokens, regexes, and hashes.
- Uses standards-compliant browser APIs (RFC 8259 JSON, RFC 4648 Base64, RFC 4122 UUID, SubtleCrypto SHA-2, IANA tzdb).
- Instant feedback with byte-size metrics, line-number syntax diagnostics, and one-click clipboard copy.
Important Assumptions & Scope
- Treats '+' as a space in query component mode.
Frequently Asked Questions — URL Decoder
Clear answers to common questions about methodology, edge cases, and privacy.
Why does URL decoding fail on a standalone '%' sign?
A literal '%' must be encoded as '%25' in valid URIs; otherwise decodeURIComponent flags a malformed URI sequence.
Is it safe to use the URL Decoder with confidential production data?
Yes. The URL Decoder executes entirely within your browser tab's memory using native JavaScript and Web Crypto APIs—no payloads, tokens, or strings ever leave your device.
Does the URL Decoder support UTF-8 and multi-line inputs?
Yes. All UtilAxis developer utilities handle multi-byte UTF-8 characters (including ₹, accented characters, and emojis) as well as multi-line payloads without truncation.