Hash Avalanche Visualizer
Type two nearly-identical messages and watch a cryptographic hash's avalanche effect: a change of a single character flips about half of the digest's output bits.
The same five digests over a whole file, with a checksum list to verify them against, are the File Hasher & Checksum Verifier. To read one of them as a shape rather than as hex, Hash Landscape builds its terrain out of a SHA-256.
About this lab3 paragraphs
The two digests sit side by side with the differing hex nibbles highlighted. Each one is underlined by how many of its four bits flipped, so a one-bit change and a four-bit change look different, and the page reports the share of bits that changed.
The verdict grades diffusion against the ideal, which is half the output bits and no more. Flipping every bit would be just as predictable as flipping none, so the grade measures how close to half the result is, not how high it is. All five functions offered here clear it, MD5 included.
Pick MD5 or SHA-1 and the digests carry the same [ WARN ] label the File Hasher uses. Avalanche and collision resistance are different properties. MD5 and SHA-1 pass the avalanche test here and fail badly on collision resistance, which is what the warning is about. A strong reading here is not a proof about the function. It is one pair of inputs.