How to use Null Byte Scanner
- Select files to count null bytes and locate runs of consecutive 0x00 values.
- Adjust the options for the report you need.
- Select “Scan Null Bytes,” review the result, and download the generated file.
FILE TOOL // 047
Null Byte Scanner
Count zero-value bytes and locate contiguous null runs, helping you inspect padding, sparse-looking regions, terminators, and binary structure.
Processed locally in your browser
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Exact zero-byte analysisFileSizeType
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What this file tool does
Count zero-value bytes and locate contiguous null runs, helping you inspect padding, sparse-looking regions, terminators, and binary structure.
Every selected byte is compared with 0x00. The report counts all nulls and records runs at or above the chosen minimum length.
Processing stays on this device. A null byte is common in many legitimate binary formats. This scanner describes byte locations and does not diagnose corruption or malicious content.
Supported inputs and limits
A null byte is common in many legitimate binary formats. This scanner describes byte locations and does not diagnose corruption or malicious content.
| Target | Byte value 0x00 |
|---|---|
| Run threshold | 1 to 1,048,576 bytes |
| Metrics | Count, density, offsets, run length |
| Output | JSON or CSV |
Example and practical tips
Practical example
Scan a binary image for long zero-filled regions, then use the reported offsets for targeted inspection with a hex viewer.
Tips
- Use a longer minimum run to focus on padding regions.
- A high null-byte count may be normal for UTF-16 text or sparse structures.
- Keep offset notation consistent with your other analysis tools.
Frequently asked questions
How do I find null bytes in a file?
Choose the file and minimum run length; the scanner reads every byte and reports counts and offsets.
What is a null byte?
It is a byte with numeric value zero, commonly written as 0x00.
Why does a UTF-16 file contain many zero bytes?
Basic Latin characters in UTF-16 often include a zero high byte depending on byte order.
Do long zero runs mean a file is damaged?
No. They can be intentional padding, reserved space, sparse data, or part of a valid format.
Can I download the null-byte offsets?
Yes. Choose JSON for a structured report or CSV for one row per recorded run.
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Null Byte Scanner details
| Tool number | 047 |
|---|---|
| Category | File Inspection & Analysis |
| Processing | Local browser operation |
| Download | Generated report or verification bundle |
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