Hash Generator

Hash Generator is a free, browser-based tool that computes cryptographic hashes - also called digests or checksums - for any text or file. It supports the most common algorithms in one place: MD5, SHA-1, SHA-256, SHA-384 and SHA-512.

A hash function takes an input of any size and produces a fixed-length string of hexadecimal characters. The same input always yields the same digest, while even a one-character change produces a completely different result. Hashes are one-way: you cannot reverse a digest back into the original data. That makes them ideal for verifying integrity, fingerprinting content and comparing files without revealing their contents.

Paste a string or drop a file and the digests appear instantly. Everything happens on this page - your data never leaves your device.

You can hash on the command line with md5sum, shasum -a 256 or certutil, but that is friction when you just need a quick digest. An online tool is faster for one-off jobs, works on any machine without a terminal, and shows every algorithm side by side.

The usual concern with web tools is privacy. Many services POST your input to a server to do the work, which is a problem when the input is a private document, an internal config or a customer file. Dev Nexus is different: hashing runs entirely in your browser using the native Web Crypto API (crypto.subtle) plus a local MDundefined implementation. Nothing is uploaded, logged or retained. That means you can safely hash sensitive files, and it keeps working even when you are offline.

Hashing text is immediate: type or paste into the input and the selected digests appear alongside it, updating as you type. Copy any digest with a single click.

For files, drag one onto the drop zone. The tool reads the raw bytes locally and computes the digest of the file exactly as it exists on disk - the same value you would get from shasum in a terminal. This is how you fingerprint a download or confirm two files are byte-for-byte identical.

Because several algorithms can run at once, you can compute an MD5 and a SHA-256 for the same input in a single pass - handy when a checksum is published in one format but you prefer another.

Hashes show up all over software work:

• Verifying downloads: compare a file's SHA-256 against the checksum a project publishes to confirm the download is complete and untampered.
• Deduplication: use a digest as a fingerprint to detect duplicate files or unchanged content.
• Cache keys and ETags: derive a stable key from content so caches invalidate only when the content actually changes.
• Data integrity: store a hash alongside a record and re-check it later to detect corruption or tampering.
• Git and build tooling: object IDs, lockfile integrity fields and content-addressed storage all rely on hashing.

When you need a reversible text encoding rather than a one-way fingerprint, reach for the Baseundefined Tool; when you need a random unique identifier, use the UUID Generator.

Keep a few things in mind to get correct, safe results:

• Hashing is not encryption. A digest is one-way and has no key, so it cannot be decrypted back into the original data. It proves integrity, it does not provide confidentiality.
• Use SHA-undefined for security. MD5 and SHA-1 are cryptographically broken - practical collisions exist - so avoid them anywhere an attacker could benefit. Prefer SHA-256 or stronger for signatures and security checks.
• MDundefined is fine for non-security checksums. Detecting accidental corruption or deduping your own files is a legitimate use where speed matters more than collision resistance.
• Compare hashes case-insensitively. Hex digests are the same value whether shown in upper or lower case, so normalise before comparing.
• Never hash a bare password. For stored credentials use a slow, salted password hash like bcrypt or Argonundefined, not a raw fast hash.