UCS-2 Decoder

Decodes UCS-2 hex input into Unicode text for developers and data engineers dealing with legacy data.

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1,624+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

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Worked Example & Common Values

Below is a sample worked calculation demonstrating how UCS-2 Decoder processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

The UCS-2 Decoder converts hex-encoded UCS-2 code units into standard Unicode text. It is designed for developers, data engineers, and localization teams who must extract readable characters from legacy data sources. Conceptually, the tool parses pairs of hex digits to form 16-bit units, then maps each unit to a Unicode character according to the selected byte order. It supports optional BOM detection to align data interpretation with producer encoding and provides deterministic results with explicit error reporting. The decoding process is strict about UCS-2 constraints: values must be within 0x0000–0xFFFF, and surrogate halves are treated as errors or replaced when configured. This ensures that outputs remain predictable and suitable for downstream processing. Core value lies in repeatability, transparency of decoded code units, and actionable error data that helps identify corrupt or misaligned input. Use cases include decoding log exports, legacy messages, protocol payloads, or data dumps where text is stored as UCS-2 hex. The tool outputs the decoded_text alongside an error log, enabling developers to decide whether to repair, replace, or re-encode problematic units. Its deterministic behavior, endianness handling, BOM awareness, and explicit edge-case reporting differentiate it from generic encoding utilities, making it especially valuable for data-forensics, localization pipelines, and retroactive data recovery.

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How to Use

Provide inputs: hex_input string, endianness option (little or big), and optional BOM flag.
Configure handling: choose whether to ignore whitespace and how to treat invalid units (replacement vs error).
Run decoding: execute to obtain decoded_text and an error list.
Review outputs: inspect decoded_text for readability and examine errors to locate problematic code units.
Export or reuse: copy results or export raw code units and hex dumps for auditing.

Frequently Asked Questions

Find Quick Answers

What is UCS-2?

UCS-2 is a fixed-width 16-bit encoding that represents Unicode code units from 0x0000 to 0xFFFF. It does not encode code points above 0xFFFF, which in UTF-16 would require surrogate pairs. This tool decodes such units into standard Unicode characters when possible.

How should I input hex?

Enter a hex string with optional spaces. The tool groups digits into two-character pairs to form 16-bit code units and applies the selected endianness. Non-hex characters or odd-length strings produce decoding errors.

How are invalid sequences handled?

If a code unit falls in the surrogate range or is otherwise invalid for UCS-2, the tool can replace it with U+FFFD or report it as an error depending on configuration, ensuring transparent diagnostic output.

Can I decode data with a BOM?

Yes. If a BOM is present, the tool can detect and apply the indicated endianness, aligning interpretation with the data producer. Mismatched BOM and endianness will raise a warning or error depending on settings.

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