Hash generator: MD5, SHA-1, SHA-256 and SHA-512

How to use

1. Choose "Text" or "File".
2. Enter text and press "Calculate hash", or choose a file (it is hashed as soon as you select it).
3. The MD5, SHA-1, SHA-256 and SHA-512 values appear. Copy each one with its button, and switch to uppercase if you need it.
4. To verify, paste the expected value into "Expected hash to compare"; the tool shows whether it matches and which algorithm matched.

Supported formats and limits

• Files up to 100 MB and text up to 5 MB. The whole file has to be read into memory, so the limit is kept conservative for phones.
• Text is hashed as UTF-8 bytes. Line breaks and trailing spaces count, so any difference changes the result. Browsers turn line breaks in the text box into LF, so to match a file with CRLF line endings, hash the file itself.
• Hashing (Web Crypto) only works on pages served over https.
• MD5 and SHA-1 are broken: different data with the same hash can be made on purpose. They are fine for spotting accidental corruption, but not for security such as tamper protection or passwords.

How it works

SHA-1, SHA-256 and SHA-512 are calculated with the browser's built-in crypto.subtle.digest. MD5 is not part of Web Crypto, so it comes from the audited open-source library @noble/hashes (MIT license). Results are shown as lowercase hexadecimal.

The comparison ignores surrounding spaces and letter case and uses only the first word, so a sha256sum line ("hash filename") can be pasted as is.

A hash is a one-way value, not encryption. Plain SHA-256 is too fast for storing passwords and can be brute-forced; use a dedicated method such as bcrypt, scrypt or Argon2.