Detect the actual image format from file bytes, regardless of extension. Free online tool — no signup.
Drop your images here
Supports HEIC, JPG, PNG, WebP, AVIF, TIFF, GIF · 50MB max
Detect the true file format of an image by analyzing its binary signature, regardless of the file extension. Identifies mislabeled files and reveals the actual encoding. Useful for debugging image issues and verifying file integrity.
Your images are processed entirely in your browser. They are never uploaded to any server. Once you close the tab, all data is gone. No tracking, no storage, no cookies for your files.