Key Facts
- Category
- Utilities
- Input Types
- text
- Output Type
- text
- Sample Coverage
- 4
- API Ready
- Yes
Overview
The Magic Number Detector is a precise utility designed to identify file types by analyzing their unique file signatures, commonly known as magic numbers. By inputting the hexadecimal header sequence, you can instantly verify the true format of a file regardless of its extension.
When to Use
- •Verify the authenticity of a file when the extension is missing or suspicious.
- •Troubleshoot corrupted files that fail to open in standard software.
- •Identify unknown binary data extracted from raw disk images or network streams.
How It Works
- •Enter the hexadecimal signature string found at the beginning of your file.
- •Submit the sequence to the detector to compare it against known file format standards.
- •Receive the identified file type or format associated with that specific byte sequence.
Use Cases
Examples
1. Identifying a ZIP Archive
System Administrator- Background
- A user sent a file named 'data.txt' that failed to open in a text editor.
- Problem
- The file extension suggests a text file, but the content appears to be binary data.
- How to Use
- Extract the first 4 bytes of the file using a hex editor and input them into the detector.
- Example Config
-
50 4B 03 04 - Outcome
- The tool identifies the signature as a ZIP archive, confirming the file was mislabeled.
2. Validating Image Integrity
Web Developer- Background
- An uploaded image on a website is not rendering correctly in the browser.
- Problem
- Need to confirm if the file is a valid JPEG or if the header is corrupted.
- How to Use
- Input the standard JPEG header signature into the detector.
- Example Config
-
FF D8 FF - Outcome
- The tool confirms the signature matches JPEG, helping isolate the issue to the image data rather than the file format.
Try with Samples
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FAQ
What is a magic number?
A magic number is a constant numerical or text value used to identify the file format or protocol of a file, typically located in the first few bytes of the file header.
Do I need to include spaces in the hex signature?
No, the tool accepts both space-separated hex strings (e.g., 50 4B 03 04) and continuous strings (e.g., 504B0304).
Can this tool identify any file type?
It can identify any file type that has a standardized, well-documented magic number signature.
Is my file data uploaded to a server?
The tool processes the signature string locally; no actual files are uploaded or stored.
Why does my file have a different extension than the result?
If the result differs from your extension, it indicates the file has been renamed or mislabeled, which is a common tactic in obfuscation or a sign of a corrupted header.