How to use URL Encoder/Decoder
- 1
Open the URL Encoder and Decoder
Go to tools.slaytic.com and open the URL Encoder/Decoder. No sign-up or account required.
- 2
Paste your text or encoded string
Add the value you want to encode, or the percent-encoded string you want to read.
- 3
Choose encode or decode
Encode a value before putting it in a URL; decode one to see what it actually says.
- 4
Copy the result
Take the converted string into your URL, code or request.
How this works in your browser
Encoding uses the browser’s own component-encoding function, which converts each byte outside the unreserved set into a percent sign followed by its two-digit hexadecimal value. The choice of component encoding rather than whole-URL encoding is deliberate and is the distinction that trips people up most often: a whole-URL encoder deliberately leaves slashes, question marks and ampersands alone because it assumes they are structure, which is precisely wrong when those characters appear inside a value you are inserting. Text is treated as UTF-8 before encoding, so accented characters and emoji become several sequences each, one per byte, and reverse cleanly on decode. Everything happens locally with no network request.
URL Encoder/Decoder vs. traditional online converters
| Feature | URL Encoder/Decoder (in-browser) | Traditional online converters |
|---|---|---|
| File upload required | No - never leaves your device | Yes - file is sent to a server |
| Processing queue | None - starts instantly | Often, especially at peak times |
| Watermark on output | Never | Common on free plans |
| Usage limits | None - free, unlimited use | Often capped per day or file size |
| Works offline once loaded | Yes, for most tools | No - requires a live connection |
| Account required | No | Often, for anything beyond a trial |
Who uses URL Encoder/Decoder
Building query strings safely
Encode parameter values so special characters do not break the URL structure.
Debugging an API call
Decode a percent-encoded parameter to see what was actually being sent.
Reading tracking links
Decode a long marketing or redirect URL to understand where it points.
Handling non-English text
Encode names, search terms and addresses containing accents or non-Latin scripts.
Frequently asked questions
What characters get encoded?
Characters that are not valid in a URL, such as spaces, ampersands, and other reserved symbols, are converted to their percent-encoded form.
Is this the same as encoding a whole URL versus a single parameter?
This encodes text as a URL component (matching encodeURIComponent), the correct choice for individual query parameter values rather than a full URL with its scheme and slashes intact.
Is my text sent anywhere?
No, encoding and decoding happen entirely in your browser.
Why does my URL contain %20 everywhere?
Because a URL cannot contain a literal space, so each one is replaced by its byte value in hexadecimal after a percent sign. The same applies to every character outside the small safe set, which is why an encoded string looks like noise. Decoding turns it back into readable text.
Why is my query parameter breaking the URL?
Almost always because the value contains an ampersand or an equals sign, which the receiving system reads as the start of a new parameter. Encoding the value converts those into percent sequences so they are treated as part of the value rather than as structure. Encode each value individually, not the assembled URL.
How are accented characters and emoji handled?
They are encoded as several percent sequences each, because those characters occupy multiple bytes and percent-encoding works one byte at a time. A single emoji commonly becomes four sequences, which looks alarming but decodes back perfectly.
Is it safe to put personal data in a URL?
It is worth avoiding regardless of encoding. Encoding makes characters safe to transmit, not private: URLs appear in server logs, browser history, analytics and referrer headers. Sensitive values belong in a request body, not a query string.