Calculate perceptual hash, MD5, SHA-256, and other hashes of image files.
Choose an image file to obtain two different kinds of identifiers: byte-for-byte digests such as MD5 and SHA-256, and a perceptual hash intended for comparing visual content. The file is processed entirely in the browser and is not uploaded. The important distinction is that exact digests describe the complete encoded file, not merely its visible pixels. Two images that look identical can therefore have different digests because their formats, compression settings, color profiles, metadata, or container details differ.
For MD5, SHA-256, and any other exact digest displayed, the input is the image's complete byte sequence. The same bytes processed with the same algorithm produce the same value. Headers, metadata, embedded profiles, and compressed image data all contribute. SHA-256 is the appropriate displayed choice when checking integrity against a trusted digest.
The perceptual hash serves a different comparison task. It summarizes image appearance so that resized, recompressed, or modestly altered versions may remain more closely related than their exact digests suggest. The hash is not a similarity percentage or an integrity guarantee. Meaningful comparison requires results produced by the same perceptual-hash method and an appropriate distance rule.
Use SHA-256 when you possess a trusted SHA-256 value for the exact original file and need a byte-level integrity check. Use the perceptual hash when re-encoding, resizing, or similar presentation changes are expected and you want to find visually related candidates. No perceptual match can certify that an image is authentic or unaltered.
Saving again can rewrite compression data, metadata, color-profile information, field ordering, or container structures even when the rendered picture appears unchanged. MD5 and SHA-256 cover all those bytes, so different values are expected. The perceptual hash may remain related, but that depends on the resulting visual content and the perceptual method used.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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