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Google Chrome dictionary file (.bdic)

.bdic file signature | application/octet-stream

Google Chrome dictionary files are binary dictionary resources created and maintained by Google Chrome for spell checking and word suggestion features. They are used by the browser and related Chromium-based applications to support input correction, language-specific dictionaries, and custom vocabulary data. The format is generally safe, though files from untrusted sources should be treated cautiously because any malformed binary data can potentially affect software that attempts to read it.

Safe

Magic Bytes

Offset 0
42 44 69 63

Sources: Gary Kessler

Extension

.bdic

MIME Type

application/octet-stream

Byte Offset

0

Risk Level

Safe

Validation Code

How to validate .bdic files in Python

Python 
def is_bdic(file_path: str) -> bool:
    """Check if file is a valid BDIC by magic bytes."""
    signature = bytes([0x42, 0x44, 0x69, 0x63])
    with open(file_path, "rb") as f:
        return f.read(4) == signature

How to validate .bdic files in Node.js

Node.js 
function isBDIC(buffer: Buffer): boolean {
  const signature = Buffer.from([0x42, 0x44, 0x69, 0x63]);
  return buffer.subarray(0, 4).equals(signature);
}

How to validate .bdic files in Go

Go 
func IsBDIC(data []byte) bool {
    signature := []byte{0x42, 0x44, 0x69, 0x63}
    if len(data) < 4 {
        return false
    }
    return bytes.Equal(data[:4], signature)
}

API Endpoint

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

See the full API documentation for all endpoints and parameters.

Frequently Asked Questions

What is a .bdic file?

A .bdic file is a Google Chrome dictionary file file. Google Chrome dictionary files are binary dictionary resources created and maintained by Google Chrome for spell checking and word suggestion features. They are used by the browser and related Chromium-based applications to support input correction, language-specific dictionaries, and custom vocabulary data. The format is generally safe, though files from untrusted sources should be treated cautiously because any malformed binary data can potentially affect software that attempts to read it.

What are the magic bytes for .bdic files?

The magic bytes for Google Chrome dictionary file files are 42 44 69 63 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.

How do I validate a .bdic file?

To validate a .bdic file, read the first bytes of the file and compare them against the known magic bytes (42 44 69 63) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.

What is the MIME type for .bdic files?

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

Is it safe to open .bdic files?

Google Chrome dictionary file (.bdic) 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.