Hash Calculator

Calculate hash values for text or files

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About Hash Calculator

Free online hash calculator supporting MD5, SHA-1, SHA-256, and SHA-512. Input text or upload files to instantly compute hash values. Uses the Web Crypto API for SHA algorithms and a lightweight JS implementation for MD5. One-click copy for each hash value — 100% client-side, your data never leaves your browser.

How to Use

  1. Choose text input or file upload mode.
  2. Type or paste text, or drag & drop a file.
  3. Hash values for MD5, SHA-1, SHA-256, and SHA-512 are computed instantly.
  4. Click the copy button next to any hash value to copy it.

FAQ

What is a hash function?
A hash function maps data of arbitrary size to a fixed-size digest. It's one-way — you cannot recover the original data from the hash.
Is MD5 secure?
MD5 is considered cryptographically broken. Use SHA-256 or SHA-512 for security purposes. MD5 is still useful for checksums and non-security use cases.
Are my files uploaded to a server?
No. All hashing is done in your browser using Web Crypto API. Files are read locally and never sent anywhere.
What's the maximum file size?
Large files (>100MB) may cause browser slowdowns. For typical files, there's no practical limit.