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File Integrity Checker

Hash real files and compare them with an expected SHA-256.

Tool inputs stay in your browser · optional AI search sends your query

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Good to know: Choose one or two files, up to 100 MB combined. Computes SHA-256from the actual bytes. Optionally paste a trusted 64 hex-digit checksum or compare two files. Matching hashes indicate byte identity with extremely high confidence; they do not prove a file is harmless or who created it. Entire file bytes are read into memory, sequentially. Files are processed on your device, not sent to our server. Limits protect browser memory; close other heavy tabs on older phones.

How to use it (step by step)

  1. 1Choose a file.
  2. 2Wait for its fingerprint (SHA-256) to appear.
  3. 3Compare it with the fingerprint from the sender: if they match exactly, the file was not changed.

Words to know

Hash / fingerprint (SHA-256)
A short code calculated from a file or text. Change even one letter and the code becomes completely different, so it proves nothing was altered.
SHA-1 / SHA-256 fingerprint
A short code that identifies the key used to sign your app. Firebase, Google Sign-In and Maps ask for it to make sure requests come from your real app.
Hex / binary
Other ways of writing numbers. Binary uses only 0 and 1; hex uses 0–9 and A–F.
Data storage units
Sizes of digital files: 1 KB ≈ a short text, 1 MB ≈ a photo, 1 GB ≈ a movie. 1 GB = 1,000 MB (or 1,024 in computer counting).
Byte
The basic unit of computer storage. One basic letter = 1 byte in UTF-8; ñ = 2 bytes; most emoji = 4 bytes.

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