Developer Tools
URL Decoder
Decode percent-encoded URLs back to human-readable text.
URL Encoder
Percent-encode full URLs, components, query parameters, and characters client-side instantly. Features safe URI encoding (keeps boundaries like ? & = intact), deep component encoding, strict RFC 3986 compliance, space character overrides, casing modifiers, and live character counts.
Encoding Options
Security check: All encoding happens locally in your browser. No contents are uploaded.
What is the URL Encoder?
The FreeTechLearner URL Encoder allows you to convert plain text strings, URLs, and query parameters into percent-encoded strings in real-time. It operates completely in the browser and provides fine-grained control over URL structures, space substitutions, and output casing.
How to Use
- Paste your URL or raw string into the plain text input area.
- Choose your encoding mode: Component (encodes all delimiters), Safe URI (preserves URL structure), or Strict RFC 3986.
- Optionally enable space encoding as "+" or format the hex escape codes as lowercase.
- The percent-encoded string updates in real-time in the output panel.
- Click "Copy" to save to your clipboard, or "Download" to save the result as a text file.
Common Use Cases
- Encoding query string keys and values for API integrations
- Preparing destination parameters for OAuth redirects
- Creating safe permalinks with special characters
- Encoding form parameter payloads for HTTP POST requests
Key Benefits
- 100% client-side execution — completely secure and private
- Real-time encoding as you type with character counters
- Three flexible encoding standard modes
- Support for modern hex code casing rules and space replacements
- Instant one-click clipboard copying and file downloads
Frequently Asked Questions
What is URL encoding (percent-encoding)?
URL encoding is a mechanism used to translate special characters (like spaces, slashes, or ampersands) into a representation that is safe for transmission over the internet within a URL. Characters are replaced with a percentage sign (%) followed by a two-digit hexadecimal representation of their ASCII code.
What is the difference between encodeURI and encodeURIComponent?
encodeURI is designed to encode a full, complete URL. It keeps domain names, query structure, and path separators intact (like /, ?, &, =, #). encodeURIComponent is designed to encode a single query parameter or path segment, meaning it will aggressively encode all characters including slashes, question marks, and ampersands so they don't break the URL syntax.
What is strict RFC 3986 encoding?
Standard JavaScript encodeURIComponent does not encode certain characters like !, ', (, ), and * because they are technically safe in some contexts. Strict RFC 3986 mode forces percent-encoding of these characters as well, ensuring absolute compatibility across strict server APIs.
Why would I want to encode spaces as "+"?
In standard query strings (application/x-www-form-urlencoded format), spaces are historically encoded as a plus sign (+) instead of %20. Some back-end systems expect spaces as + in form submissions or query parameters.
Is my data secure when using the URL Encoder?
Yes. All percent-encoding happens entirely inside your browser using client-side JavaScript. None of the text you type or URLs you copy are sent to our servers.
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