URL Encoder / Decoder & Slug Generator
Online URL encoder/decoder and SEO URL slug builder. Encode query parameters, decode links, or transform article titles into search-friendly URL handles.
Understanding URL Encoding, Decoding & Slugs
URLs can only contain specific safe characters from the US-ASCII character set. Characters outside of this allowed list must be translated using URL encoding (also known as Percent-encoding). Our free online tool lets you perform these conversions inside your browser.
Encode Component vs. Encode Whole URL
- Encode Component: Encodes all special characters including
?,=,&, and/. Use this when encoding individual query parameter values to ensure they do not break the main URL structure. - Encode Whole URL: Leaves basic URL structural symbols like protocol (
http://,https://) and path delimiters intact, while encoding non-ASCII characters and spaces.
How does the SEO Slug Generator work?
SEO URLs should be clean, readable, lowercase, and devoid of noisy characters. The Slug Builder reads your title, strips common diacritics/accents (such as á, é, ó, ü), filters out punctuation, and replaces spaces with your selected separator (usually a hyphen). This improves your site's search engine crawl efficiency and click-through rates.
What is the URL Encoder / Decoder?
The URL Encoder/Decoder is a critical web-development tool. Because web URLs can only contain specific ASCII characters, any special characters (like spaces, emojis, or symbols) must be safely encoded into hexadecimal formats before being sent over the internet.
How It Works (Logic)
URL Encoding (also known as Percent-Encoding) replaces unsafe characters with a % followed by two hexadecimal digits. For example, a blank space becomes %20. The tool uses native JavaScript encodeURIComponent() functions to guarantee RFC 3986 compliance.
"Hello World" $\rightarrow$ Encode $\rightarrow$ "Hello%20World"
The percent-encoding logic required for safe HTTP routing.
How to Use It
The tool operates bi-directionally. Paste a massive, messy URL query string full of % symbols and click Decode to read the human text. Or, type a sentence with special characters and click Encode to safely format it for a web browser link.