Free Developer Tool
Image File Signature Checker
Inspect an image file's binary signature to identify its actual file format.
Select an image file to inspect its actual file signature.
What is Image File Signature Checker?
Check an image file's binary signature to determine which format it actually uses. File signatures can help identify images even when the filename extension is missing, incorrect or misleading.
How to use
- Upload or select an image file.
- Read the detected file signature.
- Compare the signature with known image formats.
- Review the detected format and file information.
Features
- Binary signature detection
- Image format identification
- Magic number inspection
- Browser processing
Common Use Cases
- File type verification
- Upload validation
- Security checks
- Image debugging
Example
Input
File: image.bin
Output
File signature: FF D8 FF Detected format: JPEG MIME type: image/jpeg
FAQ
What is a file signature?
A file signature is a sequence of bytes near the beginning of a file that can identify its format.
Can the signature reveal the real file type?
Yes. Comparing the binary header with known signatures can identify the underlying file format even when the extension is incorrect.
Does the tool upload my image?
No. Processing can be performed locally in the browser.
Missing a feature?
If this tool doesn't cover your use case or is missing functionality, please let me know through the Contact page.
New improvements and features are added based on user feedback.