Developer Tools
Encode URL Text and Parameters
URL Encoder for encoding, decoding, parsing, or checking URLs.
Direct Answer
Use the URL Encoder when a query parameter, redirect URL, campaign link, or API value contains spaces, ampersands, symbols, or characters that must be escaped.
When you need URL encoding
Percent-encoding lets a URL safely carry characters that would otherwise break its structure or get misinterpreted.
- Adding spaces, ampersands, or symbols inside a query parameter value
- Building redirect URLs that embed another full URL as a parameter
- Creating campaign or UTM tracking links with readable but unsafe characters
- Preparing values for an application/x-www-form-urlencoded POST body
- Escaping non-English text so it survives transmission through a URL
What URL encoding doesn't do
Percent-encoding is about safe transport through URL syntax, not privacy.
- It is not encryption and provides no confidentiality for the value
- It is trivially and instantly reversible by anyone
- Encoded values are still visible in browser history, server logs, and network requests
- Reserved characters like ampersand, equals, question mark, and plus need special care
- Confidential data belongs in a request body over HTTPS, not a query string
How to Use URL Encoder
- Paste or type your content into the input box.
- The transformed result appears instantly in the result panel below.
- Click Copy result to copy the output to your clipboard.
- Download .txt saves the transformed text as a file.
- Reset clears everything and lets you start over.
Reference
| Feature | Details |
|---|---|
| Purpose | Transform pasted text into a cleaner or different format. |
| Input | Text, lines, lists, or copied content. |
| Result | Transformed text ready to copy or download. |
| Best for | Cleanup, formatting, list preparation, and copy-paste workflows. |
| Category | Developer Tools |
| Works on | Desktop, tablet, and mobile browsers |
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Frequently Asked Questions
Is URL encoding a way to hide sensitive data in a link?
No. URL encoding is fully and instantly reversible by anyone, so it provides no confidentiality at all. A token or secret placed in a query string is still visible in browser history, server logs, and proxy logs whether or not it is percent-encoded.
Why does a space become percent-20 or a plus sign?
Percent-20 is the standard percent-encoded representation of a space in a URL. A plus sign is a legacy convention specific to application/x-www-form-urlencoded bodies, where plus represents a space instead; the two conventions apply in slightly different contexts, which is a common source of confusion.
What characters actually need to be encoded in a URL?
Spaces and reserved characters like ampersand, question mark, hash, percent, plus, and non-ASCII characters generally need encoding when they appear inside a value rather than as structural delimiters. Letters, digits, and a small set of unreserved punctuation like hyphen and period are safe as-is.
Why do I see percent-25 in my encoded output?
Percent-25 is the encoded form of a literal percent sign. Since percent itself introduces an encoding sequence, any literal percent character in the original text must be escaped so it is not mistaken for the start of another percent-encoded character.
What's the difference between encoding a URI component and a full URI?
Component-level encoding escapes reserved characters like ampersand, equals, and question mark because they are treated as literal value characters, which is correct for a single parameter value. Full-URI encoding leaves those characters alone because they are structural delimiters that the URL needs to keep working.
Why did my URL break after I encoded the whole thing instead of just the parameters?
Encoding an entire URL escapes structural characters like the colon, slashes, and question mark that define the scheme, host, path, and query separators, which breaks the URL's structure. Only the individual parameter values should be encoded, not the delimiters around them.
Can encoding non-English characters in a URL cause issues later?
The characters are first converted to UTF-8 bytes and then each byte is percent-encoded, so the result depends on that byte encoding. If the receiving system assumes a different character encoding when decoding, the recovered text can come out garbled even though the encoding itself was correct.
Why does my tracking or UTM link contain percent-20 or percent-26?
Campaign names or parameter values often contain spaces or ampersands, which get encoded to percent-20 and percent-26 respectively so they don't get misread as part of the URL's own structure or accidentally start a new query parameter.