Image Hash Calculator

Generate perceptual hashes for duplicate detection and image fingerprinting

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Drag & drop an image or click to browse. Supports JPEG, PNG, WebP, and more.

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JPEG, PNG, WebP, GIF up to 20MB

How Perceptual Hashing Works
Unlike cryptographic hashes (MD5, SHA-256), perceptual hashes produce similar outputs for visually similar images, making them ideal for duplicate detection.

pHash (Perceptual)

Uses DCT (Discrete Cosine Transform) to capture frequency information. Resistant to scaling, brightness changes, contrast adjustments, and minor color shifts.

dHash (Difference)

Compares adjacent pixel gradients to capture structural patterns. Effective at detecting cropping, structural modifications, and gradient-based edits.

aHash (Average)

Compares each pixel to the average value. Extremely fast to compute, making it ideal as a first-pass duplicate filter before running more expensive checks.

wHash (Wavelet)

Uses Discrete Wavelet Transform for multi-resolution analysis. Particularly robust to watermark overlays, JPEG compression artifacts, and semi-transparent edits.

Compare against millions of known images

Hash calculation is just the beginning. Run a full PixGuard scan to match your image against stock photo databases, detect watermarks, analyze metadata, and get an AI-powered copyright risk assessment.