How to Use URL Encoder/Decoder

Encoding or decoding URL-safe percent-encoding usually means looking up rules or writing a quick script. The URL Encoder/Decoder does it in the browser: paste text or an encoded string and encode or decode—no sign-up and no data sent to a server.

What does the URL encoder/decoder do?

URL Encoder/Decoder is a free online tool that encodes special characters for safe use in URLs (percent-encoding) or decodes percent-encoded strings back to text. All processing is client-side. Special characters like spaces, &, =, ?, and non-ASCII characters need to be encoded for URLs. Percent encoding replaces unsafe characters with a % followed by two hexadecimal digits. Use it when building query strings, putting user input in URLs, or decoding received parameters for debugging. All processing runs in your browser.

Key Features

• Encode and decode — Encode: text → percent-encoded (e.g. space → %20). Decode: %XX → character. All processing is client-side.
• Safe for URLs — Encoded output is safe for query strings and path segments. Non-ASCII and reserved characters are encoded.
• Any input — Paste or type text to encode; paste percent-encoded string to decode. No size limit for in-browser processing.
• Privacy-first — Encoding and decoding run in your browser. Your text is never uploaded or stored.
• No account — Use as often as you need without sign-up.

How to Use the URL Encoder/Decoder

1. Open the URL Encoder/Decoder tool.
2. Choose Encode (text → percent-encoded) or Decode (percent-encoded → text). Paste input.
3. View the result. Copy when ready. Use the "Use tool" button on the docs page if you are reading this from the documentation.

Real Use Cases

• Build query strings — Encode key and value for ?key=value&foo=bar. Avoid broken URLs when values contain spaces or &.
• Put user input in URLs — Encode search terms or form values before appending to a URL. Prevents injection and invalid URLs.
• Decode received parameters — Paste a query string or parameter value and decode to see the original text. Debug APIs or links.
• Share links — Encode special characters in a link so it works when pasted or sent. Decode on the other side if needed.
• APIs and webhooks — Encode payload or callback URLs. Decode incoming query params for logging or validation.
• Teaching — Show how percent-encoding works. Compare with Base64 Encoder and Slug Generator.

Why Use the URL Encoder/Decoder Instead of Alternatives?

• vs. Base64 Encoder — Base64 Encoder/Decoder is for Base64. URL encoding is percent-encoding. Use the one that matches your context (URLs vs generic binary).
• vs. Slug Generator — Slug Generator makes URL-friendly slugs (lowercase, hyphens). This tool encodes any string for safe use in URLs. Use both as needed.
• vs. Hash Generator — Hash Generator produces hashes. This tool encodes/decodes for URLs. Different purpose.
• vs. Manual replace — No need to remember %20, %26, etc. One paste, encode or decode, copy.

If your encoded string is double-encoded, encoding an already-encoded string turns % into %25, etc. Decode once first, then encode again only if needed.

Benefits for Developers, QA, and Technical Writers

• Developers — Encode query params and decode incoming URLs without writing code.
• QA — Decode URLs from bug reports to see actual values.
• Technical writers — Document URL encoding and show examples.

Common Mistakes

• Double-encoded string — Encoding an already-encoded string turns % into %25, etc. Decode once first, then encode again only if needed.
• Encoding a full URL — Usually you encode only the value (e.g. query value), not the whole URL. Encode the part that needs it.
• Expecting Base64 — For Base64 use Base64 Encoder/Decoder. For URLs use this tool.
• Forgetting to copy — The result is not saved. Copy before closing the tab.

Frequently Asked Questions

What does the URL encoder/decoder do?

It encodes special characters for safe use in URLs (percent-encoding) or decodes percent-encoded strings back to text. All processing is client-side.

What characters need URL encoding?

Special characters like spaces, &, =, ?, and non-ASCII characters need to be encoded for URLs.

What is percent encoding?

Percent encoding replaces unsafe characters with a % followed by two hexadecimal digits.

Is my text sent to a server?

No. Encoding and decoding run in your browser. Your text is never uploaded or stored.

When should I use URL encode?

Use it when building query strings, putting user input in URLs, or decoding received parameters for debugging.

Why is my encoded string double-encoded?

Encoding an already-encoded string turns % into %25, etc. Decode once first, then encode again only if needed.

Conclusion and Try the Tool

URL Encoder/Decoder gives you encode and decode in one place: paste, choose direction, copy. No account, no server round-trip. For Base64 use Base64 Encoder/Decoder, for slugs use Slug Generator, and for hashes use Hash Generator.

Use the URL Encoder/Decoder tool to encode or decode URLs.