Free URL Encoder & Decoder
Updated September 2026
URL-encode and decode strings for safe use in web addresses. Encode special characters to percent-encoding and decode %XX sequences — free online.
Verified Capabilities
Encode converts special characters to %XX sequences; Decode reverses percent-encoded text back to plain text.
Malformed percent-encoded input triggers a clear error instead of failing silently.
Copy Output button copies the result to your clipboard.
There's a single encode/decode mode (encodeURIComponent) — no separate 'full URL' vs 'query parameter' toggle.
Developers need fast, accurate utilities that slot into their workflow without friction. The URL Encoder / Decoder provides exactly that — no installation, no account, no context-switching.
URL-encode and decode strings for safe use in web addresses. Encode special characters to percent-encoding and decode %XX sequences — free online. Results are immediate — no waiting, no loading screens, no account required.
Who uses the URL Encoder / Decoder?
- Developers encoding query string values before appending them to API endpoint URLs.
- SEO specialists decoding percent-encoded URLs to verify tracking parameters.
- Backend engineers debugging URL parsing issues with special characters in request paths.
Accepted input formats
The URL Encoder / Decoder accepts any standard input for this utility type. Minified, pretty-printed, and partially-formatted inputs are all handled — the tool normalises whitespace and encoding before processing. Unicode strings, multi-byte characters, special symbols, and multi-line blocks are fully supported. Very large inputs (several megabytes) may take a few extra seconds on lower-powered devices; closing unused browser tabs can free up memory for better performance. Output follows the same format conventions used by standard command-line tools and IDE extensions for this operation type.
Why use Allio Tools's URL Encoder / Decoder?
Your code and data stay entirely in your browser — nothing is logged, stored, or transmitted. The tool is completely free with no usage limits, no premium tiers, and no account required. Available in 11 languages and optimised for all screen sizes, the URL Encoder / Decoder works on desktop, tablet, and mobile with no app download needed.
See also:JSON Formatter · Base64 Encoder/Decoder · Regex Tester
How the URL Encoder / Decoder works
Paste your text or URL in the input field.
Click Encode to convert special characters to percent-encoding (e.g. space → %20, & → %26).
Click Decode to convert percent-encoded sequences back to readable characters.
Click Copy Output to copy the result to your clipboard.
Tips & tricks
- This tool uses encodeURIComponent — it escapes more characters than encodeURI, so it's meant for individual values, not whole URLs.
- Decoding invalid percent-encoded sequences shows an error rather than guessing at the result.
- Reserved characters like / and ? get encoded too, so don't run a full URL through Encode — only encode individual parameter values.
- Encoding is reversible: Encode then Decode returns your original text exactly.
Popular URL Encoder/Decoder Conversions
Frequently Asked Questions
What is URL encoding and why is it needed?
URLs can only contain a limited set of characters. Special characters (spaces, &, =, ?, #, etc.) must be percent-encoded as %XX where XX is the hex ASCII value. Without encoding, browsers misinterpret the URL structure.
What is the difference between encodeURI and encodeURIComponent?
encodeURI encodes a full URL and leaves URL structure characters (/, ?, &, =, #) alone. encodeURIComponent encodes everything except letters, digits, and - _ . ! ~ * ' ( ) — this tool uses encodeURIComponent, meant for individual values.
How is a space encoded in a URL?
Standard URL encoding converts space to %20. HTML form encoding converts space to + (plus sign). Both are valid in different contexts — query parameters in HTML forms often use +.
Can I encode a full URL with query parameters?
Enter just the query parameter values for encoding, not the full URL. Encoding the full URL would encode the slashes and colons too, breaking the URL structure. Encode individual parameter values, then assemble the URL.
What characters don't need URL encoding?
A-Z, a-z, 0-9, and the unreserved characters - _ . ~ are safe in any URL context and don't need encoding. Everything else should be percent-encoded when used in query string values.
What formats does the URL Encoder/Decoder support?
The URL Encoder/Decoder converts between url, encoded url, percent encoded, uri, and more. All conversions work in both directions — instantly, with no sign-up required.
Is my data safe when using the URL Encoder / Decoder?
Completely safe. The URL Encoder / Decoder processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.
Can I use the URL Encoder / Decoder output in commercial projects?
Yes. The URL Encoder / Decoder is a utility tool and its output carries no licensing restrictions. You are free to use results in any project, commercial or personal.
Does the URL Encoder / Decoder follow official standards?
Yes. The URL Encoder / Decoder is built to comply with the relevant industry standard or specification for this utility type. If you encounter an unexpected result, verify your input against the specification — edge cases outside the standard may produce undefined behaviour.
Works with ChatGPT, Claude, Cursor, GitHub Copilot, VS Code, Poe and more — 106+ tools, zero data collection.