MD5, SHA-1 & SHA-256 Hash Generator

A cryptographic hash function takes any input, a word, a sentence, an entire file, and produces a fixed length string of characters, its digest, that changes completely if even a single bit of the input changes. This tool calculates four of the most widely used hash algorithms, MD5, SHA-1, SHA-256, and SHA-512, from either pasted text or an uploaded file, all four at once, so you never have to guess which algorithm a checksum you are comparing against was generated with.

Why generate multiple hash algorithms at once

Different tools, platforms, and eras of software default to different hash algorithms. A software download page might publish a SHA-256 checksum, an older internal system might still reference MD5, and a security conscious API might use SHA-512. Rather than requiring you to know in advance which algorithm you need and running this tool four separate times, all four digests are calculated together from the same input, so whichever checksum you are trying to match, it is already sitting right there in the results.

MD5 and SHA-1 are broken for security, and that is worth understanding

Both MD5 and SHA-1 are now considered cryptographically broken, meaning practical collision attacks exist where two different inputs can be deliberately crafted to produce the same hash. This makes both algorithms unsuitable for any security sensitive purpose, verifying a digital signature, storing a password hash, or confirming a file has not been maliciously tampered with by an adversary who controls the file. They remain genuinely useful for non-adversarial purposes though, checking that a download completed without accidental corruption, generating a quick deterministic cache key from a piece of content, or deduplicating files by content rather than filename, situations where nobody is deliberately trying to engineer a collision.

SHA-256 and SHA-512, the modern default

SHA-256 and SHA-512, both part of the SHA-2 family, remain cryptographically strong with no known practical collision attacks, and are the current standard for security relevant hashing, verifying software integrity, blockchain systems, and TLS certificates all rely on SHA-2 family algorithms. SHA-512 operates on 64-bit words rather than SHA-256's 32-bit words, which can make it faster on modern 64-bit hardware despite producing a longer digest, though for most everyday checksum verification the practical difference between the two is negligible.

Verifying file integrity, the most common use case

The most frequent reason to reach for a hash generator is checking a downloaded file against a checksum published by its source, confirming the download was not corrupted in transit or tampered with along the way. Upload the file here, compare the generated hash character by character against the published value, and a single differing character means something changed, even if the file's size and everything else about it looks identical. This is a meaningfully different check than eyeballing file size or a modification date, since a hash mismatch catches corruption that would otherwise go completely unnoticed.

Runs entirely in your browser

SHA-1, SHA-256, and SHA-512 are calculated using the Web Crypto API, built directly into your browser. MD5 is not supported by the Web Crypto API, since browsers never implemented native support for a broken algorithm, so this tool includes its own lightweight MD5 implementation running in plain JavaScript instead. Either way, nothing you paste or upload, text or file, is ever sent to a server, logged, or stored, which makes this a safe way to check a checksum on a sensitive file without uploading its contents anywhere. If your goal is generating unique identifiers rather than checksums specifically, our UUID Generator is built for that purpose instead, part of the same Developer Utilities collection this tool belongs to.