URL Encoder / Decoder
Encode and decode URL-safe text.
Encode text for use inside URL parameters or decode percent-encoded text back into readable form. The tool uses encodeURIComponent and decodeURIComponent directly in the browser.
Tool area
How to use
- Paste text, a query value, or an encoded URL component into the input box.
- Press Encode to create URL-safe text.
- Press Decode to restore percent-encoded text.
- If decoding fails, check for incomplete percent sequences.
Use cases
- Encode search keywords before adding them to a query string.
- Read encoded values inside tracking URLs.
- Prepare API test parameters that contain spaces or CJK text.
Content and verification review:
How to verify a URL Encoder / Decoder result before relying on it
This is a reproducible review method, not another list of button instructions. Start with a small baseline whose answer you can predict, test one boundary condition, and only then use real material. Line endings, Unicode, punctuation, encoding, and destination-platform rules can change how the same text is counted, cleaned, or formatted.
Establish a predictable baseline
Use “Encode search keywords before adding them to a query string.” as the first test case. Begin with “Paste text, a query value, or an encoded URL component into the input box.” and write down the expected result before clicking anything. If the output differs, check units, formatting, whitespace, file page count, and selected options before assuming either the tool or source data is correct.
Probe an edge or failure case
For a second run, adapt “Read encoded values inside tracking URLs.” and deliberately include one empty value, extreme value, duplicate, unusual character, large file, or unsupported format. The relevant boundary is: Component encoding and complete-URL handling solve different problems; choose based on where the value will be inserted. This tells you when the page should be used as a draft aid rather than the final authority.
Cross-check before acceptance
The page is designed to “Encode and decode URL-safe text..” Write down the output you expect before running it; this makes format and setting errors easier to spot. If the result will be shared, imported elsewhere, used to replace an original file, or affect money or grades, also complete the final action “If decoding fails, check for incomplete percent sequences..” Keep the input assumptions and untouched source so another person can reproduce the decision later.
Acceptance checklist
- Input: confirm that the source, units, timezone, encoding, or file format matches the fields on URL Encoder / Decoder.
- Process: run one small case you can judge independently, followed by one likely edge case.
- Output: compare counts, pages, dimensions, totals, timing, or format, and reopen any downloaded file.
- Decision: retain the source and verify important output against official rules, the destination system, or a second method.
Who is it for
- Developers building query strings and API requests
- QA teams testing URLs containing spaces, Unicode, and symbols
- Students learning percent-encoding rules
Real examples
Encode one query parameter safely
Encode the parameter value as a component, then let application code assemble the key, equals sign, and ampersand. Encoding an entire URL as one component also escapes slashes, the scheme colon, and query separators.
Diagnose double encoding
A `%25` sequence can indicate that a percent sign was encoded again. Trace which systems touched the value before decoding multiple times, and never insert decoded untrusted content directly into HTML.
Good to know
- Component encoding and complete-URL handling solve different problems; choose based on where the value will be inserted.
- URL encoding is not input validation and does not by itself prevent open redirects, XSS, or injection.
- A plus sign can mean a space in form encoding but may remain a literal plus in a URI component.
FAQ
- Does this encode a full URL?
- It uses encodeURIComponent, which is best for individual query values or path fragments rather than an entire URL.
- Why did decoding fail?
- A percent sign may be missing two hexadecimal characters, or the text may not be valid URI encoding.
- How are spaces encoded?
- encodeURIComponent encodes spaces as %20, not as plus signs.
Privacy & local processing
🔒 This tool runs entirely in your browser. No data is uploaded to any server.
This tool runs mainly in your browser. The content you enter is not sent to FunnyTools servers.
Trust & usage note
This tool runs mainly in your browser. Your input is not actively uploaded to a server. Avoid entering highly sensitive data. Results are for reference only.
Last updated:
Get updates
New tools and practical tips, straight to your inbox. No spam, unsubscribe anytime.