URL Encoder/Decoder

A web tool that encodes and decodes URLs and query strings for developers and content creators, ensuring valid percent-encoding across apps.

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896+
Total Calculations Run
< 15ms
Browser Execution Speed
100%
Client-Side Privacy
4.9 / 5.0
User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how URL Encoder/Decoder processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}
Computed Result { "id": 1, "status": "active", "roles": [ "admin" ] }
Execution Mode Client-Side In-Browser JS
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Om dette verktøyet

This tool provides a precise, standards-compliant method to transform strings for URLs. It targets web developers, API engineers, content teams, and SEO specialists who regularly generate links, embed parameters, or sanitize input for transmission across networks. It supports both encoding and decoding workflows to fit integration scenarios.\n\nConceptually, encoding converts unsafe characters into percent-encoded sequences, while decoding reverses the process back to readable text. Users supply text, select an operation (encode or decode), and choose an encoding rule (RFC 3986, UTF-8, or ASCII). The tool then returns a single transformed string.\n\nUnique value comes from strict RFC3986 alignment, Unicode safety via UTF-8, and practical options for spaces and plus signs. This minimizes errors when constructing query strings, API calls, or marketing links. By handling edge cases in a consistent way, teams avoid encoding discrepancies across environments.\n\nCore features include input validation, error handling for invalid hex pairs, and deterministic, reversible transformations. Use cases include encoding a query parameter, decoding stored values for display, or validating round-trips in pipelines. It is designed for fast, scriptable use in development, data pipelines, and content workflows.

Hvordan bruke

  1. Provide inputs: select operation (encode or decode), encoding rule (RFC 3986, UTF-8, ASCII), and the text to process.
  2. Optional: set plus_as_space if decoding should convert '+' to spaces.
  3. Run calculation: submit the form to generate the transformed string.
  4. Review outputs: inspect the result and copy it for use in URLs or logs.
  5. Validate round-trip: re-run the opposite operation on the output to confirm data integrity.
How to use url encoder decoder online

Frequently Asked Questions

Finn raske svar

What is the difference between URL encoding and decoding?
Encoding converts unsafe characters into percent-encoded form (for example, a space becomes %20), while decoding reverses that process to reveal the original characters. The tool applies RFC 3986 rules and preserves data integrity for round-trips between systems, browsers, and servers.
Which encodings are supported?
Supported encodings include UTF-8, ASCII, and ISO-8859-1, with RFC 3986 enforcing URL percent-encoding for unsafe characters. The tool can encode or decode per these standards, returning the transformed text or signaling invalid sequences when necessary.
How are spaces and plus signs handled?
When encoding, spaces are typically encoded as %20. Plus signs are treated as literal plus characters unless the plus_as_space option is enabled to map '+' to a space during decoding. This helps align results with either query-string conventions or raw URL components.
Can it encode/decode entire URLs or just components?
The tool operates on text strings and applies percent-encoding to reserved characters per RFC 3986. For full URLs, encode or decode individual components (path, query, fragment) as appropriate; it does not parse or reconstruct complete URLs automatically.

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