Hash Calculator

中

Loading...

Hash Calculator — MD5, SHA-1, SHA-256, SHA-512 for Text and Files

Compute MD5, SHA-1, SHA-256, and SHA-512 digests for any text or file, entirely in your browser. Verify downloads, compare file contents, generate fingerprints for deduplication, or derive values for APIs that sign requests with a shared secret.

Files are read locally — nothing is uploaded, so you can hash documents, archives, and binaries of any sensitivity. Digests appear instantly for text, and large files stream through the browser's native crypto engine.

How to compute a hash

  1. Paste text into the input, or switch to file mode and drop any file.
  2. Pick the algorithm you need — SHA-256 is the modern default.
  3. The digest appears instantly; copy it with one click.
  4. For file verification, compare against the publisher's published checksum.
  5. Use UPPERCASE toggle when a system expects hex in caps.

Frequently asked questions

Which algorithm should I use?

SHA-256 or SHA-512 for anything security-related. MD5 and SHA-1 are broken for collision resistance — use them only for legacy checksums, cache keys, or non-adversarial integrity checks.

Are file uploads involved in hashing?

No. The file is read by your browser and hashed in memory on your device. Nothing is transmitted — suitable for hashing confidential documents.

Can a hash be reversed to reveal the input?

No. Hash functions are one-way. What attackers do is try candidate inputs and compare digests ("brute force") — which is why short or common passwords fall quickly regardless of the algorithm used.

Why do the same file and algorithm always give the same digest?

Hashing is deterministic — that is the point. Identical input yields identical output everywhere, which is what makes checksums useful for verifying downloads and syncing data.

Related tools

Password Generator
Generate secure passwords with custom length, charset, and entropy display
Base64 Codec
Encode/decode text and files to Base64 with URL-safe mode
JWT Decoder
Decode and inspect JSON Web Tokens, view Header, Payload and expiration

PureKit · hash · Free online tool — files processed locally in your browser, no upload.