SMS UDH Decoder

Decode SMS UDH (User Data Header) from hex or binary input to analyze concatenated messages, port addressing, and other elements.

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6,004+

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 SMS UDH 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

This SMS UDH Decoder tool allows you to decode the User Data Header from SMS messages. UDH contains important information such as message concatenation details, port addressing for applications, and other special indicators. Simply paste your hex or binary UDH data, or upload a file containing the data, and the tool will parse and display all decoded elements in a structured format. Perfect for developers working with SMS gateways or mobile messaging systems.

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How to Use

Enter your UDH data in hex (e.g., 050003CC
or binary format in the text area.
Alternatively, click the upload area to select a file containing the UDH data.
Click the 'Decode UDH' button to process the input.
View the decoded results showing each UDH element with its type, length, and value details.
Use the 'Clear' button to reset the form for a new decode operation.

Frequently Asked Questions

Find Quick Answers

What is SMS UDH?

UDH (User Data Header) is a part of an SMS message that contains control information such as concatenation for long messages, port addressing for applications, and other special indicators.

What input formats are supported?

The tool supports hex strings (e.g., 050003CC0101) and binary strings (e.g., 00000101). Spaces and other delimiters are automatically removed during processing.

Can I decode concatenated SMS messages?

Yes, the tool decodes UDH elements including concatenation information, showing reference numbers, part counts, and sequence numbers for reassembled messages.

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