URL Encoder Online
Convert plain text, spaces, Unicode characters, and query string parameters into standard percent-encoded hexadecimal format.
Smart URL Inspector
Live structural breakdown of URI components
Query Parameter Inspector
Live structured key-value table from search parameters
| Key / Parameter | Value | Actions |
|---|---|---|
| No query parameters detected in input. Enter a URL with query strings (e.g. ?key=value) or click "Add Parameter". | ||
Why Do URLs Need Encoding and Decoding?
Uniform Resource Identifiers (URIs) are constrained by the RFC 3986 specification to a limited subset of the US-ASCII character set. Any character outside this allowed range—including spaces, Unicode symbols, and reserved structural characters—must be converted into percent-encoding.
Syntax Preservation
Characters like ?, &, =, and / have special delimiter meanings in URLs. Without proper encoding, passing these in a query parameter will break URL parsing and truncate data.
UTF-8 & Unicode Safety
Modern international characters, accents (like é or ü), and emojis (🚀) are multi-byte UTF-8 sequences. Percent-encoding converts each UTF-8 byte into a safe hexadecimal representation.
Whitespace Handling
Literal space characters are invalid in raw URLs. In standard URL component encoding, space is encoded as %20 (or occasionally + in application/x-www-form-urlencoded query strings).
Difference Between encodeURI() and encodeURIComponent()
Choosing the right JavaScript function is critical to avoid broken links or double-encoded parameters.
| Feature | encodeURI() | encodeURIComponent() |
|---|---|---|
| Intended Purpose | Encodes a complete, full URL | Encodes a single query parameter value |
| Does NOT Encode (Preserved) | , / ? : @ & = + $ # ; ~ - _ . ! * ' ( ) [ ] | - _ . ! ~ * ' ( ) |
| Encodes Delimiters (&, =, ?) | No (preserves URL routing) | Yes (e.g. → %26, %3D, %3F) |
| Best Used When | You have an entire URL string with spaces | Constructing search terms, callbacks, or UTM tags |
Common Percent-Encoding Hex Reference Table
Click any hex code below to instantly copy it to your clipboard.
Explore All URL & Query String Tools
Fast, client-side developer utilities designed for privacy, speed, and accuracy.
URL Decoder
Decode percent-encoded URI strings and query components back into human text.
URL Parser & Inspector
Deconstruct any URL into protocol, host, port, path, parameters, and fragments.
Query String Parser
Extract query parameters (?k=v) into editable structured key-value tables and JSON.
Query String Builder
Visually construct query strings from key-value pairs with automatic percent encoding.
URL Cleaner & Stripper
Remove UTM tags, tracking parameters (fbclid, gclid), and empty query keys.
URL Validator
Check RFC 3986 compliance, protocol validity, and address syntax errors.
UTM Campaign Builder
Generate Google Analytics campaign tracking URLs with standard UTM parameters.
UTM Parameter Parser
Inspect and extract utm_source, utm_medium, utm_campaign, and related tags.
URL to JSON Converter
Transform any URL structure and query parameters into cleanly formatted JSON.
JSON to Query String
Convert JSON key-value objects directly into valid encoded URL query strings.
Frequently Asked Questions About URL Encode & Decode
Clear, technical answers to essential questions regarding percent-encoding, decoding mechanics, RFC standards, and hex characters.
What is URL encode and decode?
URL encode and decode are bidirectional web processes defined by RFC 3986 for transmitting data safely within Uniform Resource Identifiers (URIs). URL encoding converts characters that are disallowed or reserved in URLs (such as spaces, punctuation, symbols, and non-ASCII glyphs) into percent-encoded hexadecimal sequences like %20 or %26. URL decoding performs the inverse operation, scanning percent-encoded triplets and translating them back into their original human-readable text and UTF-8 characters.
How do I decode a URL?
To decode a URL online: (1) Copy the encoded URL or query string containing percent-encoded sequences (such as %20 or %3D). (2) Paste the string into the input field of our free online URL Decode tool. (3) Click Decode URL (to decode full web addresses) or Decode Component (for individual parameter values). (4) Instantly copy the resulting plain text. In code, you can use JavaScript's native decodeURI() or decodeURIComponent(), Python's urllib.parse.unquote(), or PHP's urldecode().
What is the difference between encoding and decoding?
Encoding is the forward transformation of plain text, data, or symbols into a standardized, machine-readable format to ensure safe transmission across networks and URI parsers without breaking syntax rules. Decoding is the reverse extraction process, converting the standardized encoded sequences back into the original raw text, symbols, or binary content. In URLs, encoding turns "hello world" into "hello%20world", while decoding turns "hello%20world" back into "hello world".
What is %27 in URL encoding?
In URL encoding, %27 represents the single quote or apostrophe character ('). In the US-ASCII table, the single quote character has a decimal code of 39, which corresponds to hexadecimal 27. When a URL parameter contains an apostrophe (for example, "John's Car"), it is percent-encoded as "John%27s%20Car" to prevent syntax ambiguities and potential database or query parsing issues.
How to decode an encoded URL?
You can decode an encoded URL using an online URL decoder tool or programmatically in software. Online: Paste your encoded link into our interactive URL Decoder tool and click Decode URL. The tool automatically identifies percent-encoded tokens and reconstructs the decoded URL. In JavaScript: Call decodeURI(encodedUrl) for full URLs, or decodeURIComponent(encodedParam) for query parameters. In Python: Use import urllib.parse; decoded = urllib.parse.unquote(encoded_url). In PHP: Use $decoded = urldecode($encoded_url);.
What is URL encoding and decoding?
URL encoding and decoding (percent-encoding) is an internet protocol mechanism that ensures web browsers, servers, and APIs exchange data unambiguously. URLs are restricted by RFC 3986 to a subset of ASCII characters. Encoding replaces unsafe characters, spaces, and reserved delimiters with % followed by two hexadecimal digits representing the character's UTF-8 byte. Decoding reads these %XX hexadecimal values and restores the original characters so applications and users can read the information.
What is an example of decode?
A practical example of URL decoding is converting the percent-encoded string: "https://example.com/search?q=developer%20tools%20%26%20apis" back into its human-readable form: "https://example.com/search?q=developer tools & apis". In this example, %20 is decoded into spaces and %26 is decoded into the ampersand symbol (&).
How to decode encoding?
To decode any URL percent-encoding: (1) Identify the percent-encoded sequences consisting of a % sign followed by two hexadecimal characters (e.g., %2F, %3A, %20). (2) Use an online URL decoder or a programming language's decoding function (like decodeURIComponent() in JS or urllib.parse.unquote() in Python). (3) The decoder translates each hex pair back to its byte value and decodes multi-byte UTF-8 sequences into the correct character or emoji.
What does "decode" mean?
In computing and web architecture, decode means converting encoded or escaped data back into its original, understandable, and uncompressed representation. When applied to URLs, decoding specifically means taking percent-escaped byte sequences (%XX) and converting them back to original text characters, words, spaces, and Unicode glyphs.
How do I encode a URL?
To encode a URL online: (1) Paste your raw URL, text, or query parameters with spaces and special characters into our URL Encoder tool. (2) Click Encode URL (using encodeURI() to keep standard routing slashes / and colons :) or Encode Component (using encodeURIComponent() to escape all reserved characters in query parameter values). (3) Copy the resulting percent-encoded string for use in APIs, HTML links, or OAuth redirects.
How does URL decoding work?
URL decoding works by parsing the input string sequentially from left to right. Whenever the decoder encounters a percent sign (%), it reads the following two hexadecimal digits (e.g., 20), converts the hexadecimal value to a byte number (0x20 = decimal 32), and maps it to the corresponding ASCII or UTF-8 character (space). If the hex bytes represent a multi-byte UTF-8 character (like %C3%A9 for é or %F0%9F%9A%80 for 🚀), the decoder combines the consecutive byte sequences into the single target Unicode glyph.