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NUI (.nui)

.nui file signature | application/octet-stream

nuru ASCII/ANSI image and palette files[15]

Safe

Magic Bytes

Offset 0
4E 55 52 55 49 4D 47 4E 55 52 55 50 41 4C

Sources: Wikipedia

Extension

.nui

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .nui files in Python

Python 
def is_nui(file_path: str) -> bool:
    """Check if file is a valid NUI by magic bytes."""
    signature = bytes([0x4E, 0x55, 0x52, 0x55, 0x49, 0x4D, 0x47, 0x4E, 0x55, 0x52, 0x55, 0x50, 0x41, 0x4C])
    with open(file_path, "rb") as f:
        return f.read(14) == signature

How to validate .nui files in Node.js

Node.js 
function isNUI(buffer: Buffer): boolean {
  const signature = Buffer.from([0x4E, 0x55, 0x52, 0x55, 0x49, 0x4D, 0x47, 0x4E, 0x55, 0x52, 0x55, 0x50, 0x41, 0x4C]);
  return buffer.subarray(0, 14).equals(signature);
}

How to validate .nui files in Go

Go 
func IsNUI(data []byte) bool {
    signature := []byte{0x4E, 0x55, 0x52, 0x55, 0x49, 0x4D, 0x47, 0x4E, 0x55, 0x52, 0x55, 0x50, 0x41, 0x4C}
    if len(data) < 14 {
        return false
    }
    return bytes.Equal(data[:14], signature)
}

API Endpoint

GET /api/v1/nui
curl https://filesignature.org/api/v1/nui

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .nui file?

A .nui file is a NUI file. nuru ASCII/ANSI image and palette files[15]

What are the magic bytes for .nui files?

The magic bytes for NUI files are 4E 55 52 55 49 4D 47 4E 55 52 55 50 41 4C at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .nui file?

To validate a .nui file, read the first bytes of the file and compare them against the known magic bytes (4E 55 52 55 49 4D 47 4E 55 52 55 50 41 4C) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .nui files?

There is no officially registered MIME type for .nui files. Systems typically use application/octet-stream as a generic fallback when handling this format.

Is it safe to open .nui files?

NUI (.nui) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.