URL Encoder / Decoder

What Is the URL Encoder / Decoder?

URLs can only safely contain a limited set of characters, and anything outside that set — spaces, ampersands, accented letters, certain symbols — needs to be converted into a percent-encoded format before it can be reliably transmitted and understood by browsers and servers. The URL Encoder / Decoder handles this conversion instantly in both directions, encoding a raw string into a safe URL format, or decoding an already-encoded string back into its readable original form.

This is a small but genuinely essential utility for anyone working with query parameters, API requests, redirect mapping, or any URL that needs to carry special characters, spaces, or non-English text safely.

It's the kind of tool that becomes indispensable the moment you actually need it — debugging why a tracking link with a space in the campaign name isn't working, decoding a mysterious percent-encoded string in a server log, or safely building a redirect rule for a URL containing an accented character — and largely invisible the rest of the time, which is exactly why having it available and instantly accessible matters.

Why This Tool Matters

Improperly encoded URLs are a surprisingly common source of broken links, failed API requests, and tracking parameters that silently stop working — a space left un-encoded in a URL, for example, can truncate the address entirely at the first space character in some contexts. Understanding and correctly applying URL encoding is a foundational technical skill for building redirect rules, constructing UTM tracking links, working with query strings, and debugging why a particular link or API call isn't behaving as expected. Even experienced developers periodically reach for a quick encode or decode check rather than trying to work it out manually from memory.

How to Use the URL Encoder / Decoder

1. Paste the URL, path, or query string fragment you want to encode or decode into the box.
2. Click "Encode" to convert special characters and spaces into a safe, percent-encoded format.
3. Click "Decode" to reverse the process and reveal the original, human-readable string.
4. Review the result in the output box, checking for any error message if a decode operation fails.
5. Copy the result and use it directly in your link, script, tracking parameter, or API request.

Best Practices

Encode individual query parameter values, not the entire URL at once

Encoding a full URL including its protocol and slashes can accidentally convert characters that are supposed to remain literal (like the colon and slashes in https://), breaking the URL structure — instead, encode just the specific value going into a query parameter.

Watch out for the + versus %20 space encoding difference

Some older systems encode a space as a plus sign (+) rather than the more modern %20, which can cause a literal plus sign to be misinterpreted as a space (or vice versa) if the encoding style doesn't match what the receiving system expects.

Always decode before trying to read or debug a suspicious URL

A URL full of percent-encoded characters is nearly unreadable at a glance — decoding it first makes it far easier to spot a typo, an incorrect tracking parameter, or an unintended character before it causes a real problem.

Use encoding consistently across all your tracking and redirect links

Mixing encoded and unencoded versions of otherwise-identical URLs across your marketing links or redirect rules can create subtle duplicate-tracking or broken-redirect issues that are difficult to trace back to their root cause.

Troubleshooting & Common Errors

I get an error saying the string couldn't be decoded

This means the text contains an incomplete or invalid percent-encoded sequence, such as a stray % not followed by two valid hexadecimal characters — check for any accidental % characters in the original text that aren't meant to be part of an encoded sequence.

My decoded URL still shows a plus sign instead of a space

Some older systems use + to represent a space instead of %20 — if your source used that convention, manually replace remaining + characters with spaces after decoding, or check which encoding standard the receiving system actually expects.

My link still doesn't work correctly after encoding it

Confirm you encoded only the specific value going into a query parameter, not the entire URL including its protocol and slashes — encoding the whole URL can break its basic structure by escaping characters that need to stay literal.

Frequently Asked Questions

What does the % symbol followed by two characters mean in a URL?

That's percent-encoding — the % is followed by the two-digit hexadecimal code for the original character. For example, %20 represents a space and %26 represents an ampersand (&).

Why do I get an error when trying to decode a certain string?

A decode error typically means the string contains an incomplete or invalid percent-encoded sequence — for example, a stray % symbol not followed by a valid two-character hex code, which cannot be reliably decoded back into a single character.

Should I encode an entire URL or just parts of it?

Generally, only the value of a query parameter or path segment should be encoded — the core URL structure (protocol, domain, forward slashes) should remain as-is, otherwise the URL itself can break.

Is URL encoding the same thing as HTML encoding?

No, they solve different problems. URL encoding makes a string safe to include inside a URL, while HTML encoding (using entities like & or <) makes text safe to display inside an HTML document without being misinterpreted as markup.

Why would a space in a URL cause a problem if I don't encode it?

Many systems interpret a raw, un-encoded space as the end of the URL or as a separator, which can truncate the link or cause an application to misread the remaining parameters entirely.

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