Percent-Encoded Unicode in Query Strings – Decode UTF-8 Values

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Inspect how UTF-8 percent escapes become Unicode text in parsed query parameters.

40 chars · 1 line

34 chars · 4 lines

2 parameters2 unique keys

UTF-8 query decoding

How percent-encoded Unicode becomes readable query text

Query strings carry non-ASCII text as UTF-8 bytes represented by percent escapes. URLSearchParams decodes those bytes back into JavaScript Unicode strings. This tool is free to use. No account or payment is required.

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What you can do here

  • Browser-native URLSearchParams behavior
  • Full URL and raw query parsing
  • Repeated parameter preservation
  • JSON object to query construction
  • Browser-local processing

Steps

  1. Paste the encoded query into Parse to JSON.
  2. Confirm the percent escapes represent valid UTF-8 bytes.
  3. Compare the decoded Unicode strings in the JSON output.

Percent escapes represent encoded bytes

Characters outside plain ASCII are UTF-8 encoded before their bytes are written as %HH sequences in a URL component.

The parser reverses that process and exposes the decoded string in JSON.

Check mark and Chinese text

Two UTF-8 values are decoded in one query.

Query string

?check=%E2%9C%93&word=%E4%BD%A0%E5%A5%BD

Parsed JSON

{
  "check": "✓",
  "word": "你好"
}

Common questions

Frequently asked questions

What character encoding is normally used for query values?

Modern URLs generally percent-encode UTF-8 bytes.

Why are there several %HH sequences for one character?

Many Unicode characters require multiple UTF-8 bytes.

What if the byte sequence is incomplete?

URLSearchParams is forgiving; see the malformed percent-encoding page for the resulting replacement characters.

Recommended next steps

Malformed Percent EncodingSee URLSearchParams' forgiving behavior when a percent-encoded UTF-8 sequence is incomplete.URL Encoder & Decoder OnlineEncode or decode one URL component when percent escapes are the issue.Query String Parser & Builder OnlineParse a URL or raw query into JSON, or build query parameters from JSON.

Debugging a specific Query String issue? Browse Query String troubleshooting.