Text Diff Checker
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Compare two pieces of text and see line-by-line additions and deletions, like a Git diff. Highlights every change.
URL Encoder & Decoder
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Encode and decode URL components and query strings. Handles spaces, special characters, and Unicode safely.
URL Encoder & Decoder
About This Tool
What is URL Encoding?
URLs can only contain a limited set of characters safely. Spaces, accents, &, =, ?, and many other characters need to be percent-encoded so they don’t break the URL structure. For example, a space becomes %20, an ampersand becomes %26.
Two Encoding Modes
- Component encoding (encodeURIComponent) — encodes everything special; use for query string values, path segments, form data
- URI encoding (encodeURI) — preserves URL structure characters like /, ?, &; use for entire URLs
When to Use Each
Encoding a parameter value? Use Component. Encoding a whole URL that already has its own structure? Use URI. Most everyday cases (encoding form values, building API requests) need Component mode.
Frequently Asked Questions
When does URL encoding fail?
Decoding can fail if the input contains a percent sign that isn't followed by a valid two-digit hex code (e.g. '%ZZ'). The tool will show 'Error: malformed input' in that case.
Should spaces become or +?
Both are seen in the wild. In URL paths and modern URLs, %20 is correct. In query strings (form-urlencoded), + is traditional. This tool uses %20 when encoding and accepts both when decoding.
Why do my emoji break in URLs?
Emoji are multi-byte UTF-8 characters that must be encoded. The tool handles them correctly u2014 paste 'u270cufe0f' and it will encode to %E2%9C%8C%EF%B8%8F.