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NeatUtility

File Hash & Checksum Calculator

Security & HashingMemory Only100% Client-Side
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About this tool, examples & FAQ

Compute and verify cryptographic file hashes (SHA-256, SHA-512, SHA-384, SHA-1, MD5, CRC-32) from binary Data URIs, Base64, Hex bytes, or text entirely in your browser. Verify release archives against vendor checksums safely.

Key facts

Verified capabilities and limits of this utility
Supported algorithmsSHA-256, SHA-512, SHA-384, SHA-1, MD5, and CRC-32
Supported input encodingsBinary Data URI, Base64 decoded bytes, Hexadecimal bytes, and UTF-8 text
Verification modeAutomated comparison against vendor checksum with match confirmation
Output formatsComprehensive multi-hash report, standard sha256sum line (<hash> <filename>), or JSON model
Max file size10 MB
Execution deadline3 s
Processing locationBrowser-only: files and binary data are never transmitted over the network

How to use

  1. Paste your file data as a Data URI (data:...;base64,...), Base64 string, Hex bytes, or text into the input editor.
  2. Choose your input interpretation (Auto-detect, Base64, Data URI, Hex, or Text).
  3. To verify a downloaded file: Paste the vendor's published checksum into the 'Expected Checksum' field.
  4. Select your desired operation: 'All Hashes & Summary', 'SHA-256 Checksum (sha256sum)', or 'Verify Checksum Match'.
  5. Click 'Run' to compute the cryptographic digests locally.
  6. Confirm the verification match badge or copy the generated checksum file line.

Example

Standard sha256sum file line

Input

hello world

Example output

b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9  archive.tar.gz

Edge cases

Binary file data vs raw text

Standard text hash tools only hash UTF-8 strings. This file hash tool parses binary bytes from Data URIs and Base64 payloads, computing the exact byte-for-byte checksum of original binary files.

Checksum verification matching

The verification engine normalizes expected hashes by stripping colons, spaces, and formatting, automatically detecting whether the match corresponds to SHA-256, SHA-512, MD5, or CRC-32.

Legacy MD5 warning

Computing MD5 checksums triggers a DEPRECATED_ALGORITHM warning because MD5 has known collision attacks and should only be used for legacy compatibility.

How it works

  1. Decodes the input into a raw Uint8Array of binary bytes based on the selected encoding (Data URI, Base64, Hex, or UTF-8).
  2. Computes cryptographic digests using standard cryptographic hash algorithms.
  3. Computes IEEE 802.3 32-bit cyclic redundancy check (CRC-32).
  4. Compares the results against any expected checksum provided and formats the output into standard sha256sum or JSON representations.

Related workflows

Frequently asked questions

Why should I verify a file checksum?

Verifying a file checksum confirms that a downloaded installer, ISO, or library has not been corrupted during transfer or maliciously altered by a third party. If the computed hash matches the published checksum, the file is authentic and intact.

What is the sha256sum format?

The standard GNU coreutils `sha256sum` utility outputs lines formatted as `<hash> <filename>`. This file can be verified directly on Linux or macOS using `sha256sum -c filename.sha256`.

Is my file uploaded to a server to compute the hash?

No. All hashing is performed entirely on your device inside a local Web Worker. No data is sent over the Internet, making it safe for proprietary binaries, confidential archives, and sensitive files.

Should I use MD5 or SHA-256 for file verification?

Always prefer SHA-256 or SHA-512. MD5 is cryptographically broken, meaning attackers can generate two different files with the exact same MD5 hash. MD5 is only useful for detecting accidental disk corruption, not intentional tampering.

References