URL Encoder / Decoder
Encode and decode URLs according to RFC 3986 with URI component vs full URL modes and query string parser.
URL Encoder / Decoder
Percent-encode & decode URLs, query strings, and URI components conforming to RFC 3986.
🔍 Parsed Query Parameters
| Parameter Key | Decoded Value |
|---|---|
| q | ProCalc 2026 |
| AI 🔥 |
Educational Purpose Disclaimer
This calculator is provided for informational and educational estimation purposes only. All calculations and projections are based on standard mathematical formulas and assumed inputs. The output values should not be considered professional financial, legal, tax, or medical advice. ProCalc is not a registered financial advisor or licensed practitioner. Always consult a qualified professional (such as a Chartered Accountant, certified planner, or physician) before making major decisions.
What is the URL Encoder / Decoder?
The URL Encoder / Decoder is a fast, 100% private in-browser utility for escaping and unescaping URLs, query parameters, and URI components conforming to RFC 3986 standards.
Web URLs can only contain a limited set of ASCII characters (unreserved characters like letters, digits, `-`, `_`, `.`, `~`). Special characters such as spaces, ampersands (`&`), question marks (`?`), equal signs (`=`), and non-Latin UTF-8 characters must be percent-encoded (e.g. space becomes `%20` or `+`) when sent inside URL parameters to prevent breaking query parsing or HTTP routing.
Key Features
- Bi-Directional Conversion: Toggle instantly between Encode and Decode modes.
- Component vs Full URL Mode: Use `encodeURIComponent` for parameter values (escapes `/`, `?`, `&`) or `encodeURI` for complete URLs.
- Query Parameter Table Parser: Automatically parses query strings (`?key1=val1&key2=val2`) into a structured, copyable key-value table.
- UTF-8 & Emoji Friendly: Encodes multi-byte UTF-8 symbols and emojis seamlessly into percent-encoded bytes.
- One-Click Copy: Copy encoded/decoded result to clipboard with a single click.
How Does the URL Encoder / Decoder Work?
1. Select Mode: Choose Encode or Decode.
2. Select Encoding Scope: Choose URI Component (escapes all special chars) or Full URL (preserves URL scheme & path separators).
3. Type or Paste String: Input text or paste URL in the input field.
4. Inspect Query Parameters: If input contains query strings, view parsed key-value pairs in the query parameter inspector table.
5. Copy Result: Click Copy to Clipboard.
Formula & Calculation Method
Percent Encoding:
Non-ASCII and reserved characters are converted into their UTF-8 byte sequences, with each byte represented by `%` followed by a two-digit hexadecimal number.
- Space ` ` => `%20`
- Exclamation `!` => `%21`
- Emoji 🔥 => `%F0%9F%94%A5`
Example Calculation
Input Text: "https://example.com/search?q=ProCalc 2026 & AI 🔥"
- Encoded URI Component: `https%3A%2F%2Fexample.com%2Fsearch%3Fq%3DProCalc%202026%20%26%20AI%20%F0%9F%94%A5`
- Encoded Full URL: `https://example.com/search?q=ProCalc%202026%20&%20AI%20%F0%9F%94%A5`
Frequently Asked Questions
**Percent Encoding:** Non-ASCII and reserved characters are converted into their UTF-8 byte sequences, with each byte represented by `%` followed by a two-digit hexadecimal number. - Space ` ` => `%20` - Exclamation `!` => `%21` - Emoji 🔥 => `%F0%9F%94%A5`
Disclaimer: This tool is provided for informational and calculation purposes. Output values are estimates based on standard user inputs.