Image Format Detector
Determine the true format of any image file by reading its binary file signature (magic bytes), not just its file extension. File extensions can be wrong or misleading — an image renamed from .jpg to .png is still a JPEG internally. This tool reads the actual file header to identify the true format. Also displays other technical details and flags any mismatches between the file extension and the true format.
Image Format Detector
Detect the true format of any image by reading its file signature.
Upload Image
or drag and drop
How to Use Image Format Detector
- 1Upload any image file
- 2The tool reads the file signature and identifies the true format
- 3Any extension/format mismatches are highlighted
Your Privacy is Protected
Image Format Detector runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
Why does the true format matter?
Processing an image with the wrong assumed format can cause errors in scripts, web servers, and applications. This tool verifies the true format by reading the binary signature.