Free Toolkit

File Hash ViewerCalculate SHA-1, SHA-256, and SHA-512 hashes of uploaded files for integrity verification.

File Hash Viewer illustration
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File Hash Viewer

Calculate SHA-1, SHA-256, and SHA-512 hashes of uploaded files for integrity verification.

How to Use
1

Upload

Select or drag-and-drop any file.

2

View Hashes

SHA-1, SHA-256, SHA-512 hashes instantly.

3

Compare

Copy and compare against published checksums.

What Is File Hash Viewer?

Calculates cryptographic hashes using the Web SubtleCrypto API. SHA-1, SHA-256, and SHA-512 are unique fingerprints of file content—even one byte change produces a completely different hash. Files processed locally, never uploaded. For download verification, integrity checking, and duplicate detection.

Why Use Our File Hash Viewer?

  • SHA-1, SHA-256, SHA-512
  • SubtleCrypto API
  • Files never leave device
  • One-click copy
  • Any file type

Common Use Cases

Download Verification

Verify software matches publisher checksum.

File Integrity

Confirm files are not corrupted.

Duplicate Detection

Compare hashes for identical files.

Security Auditing

Verify system file integrity.

Technical Guide

crypto.subtle.digest() with FileReader.readAsArrayBuffer(). Algorithms: SHA-1, SHA-256, SHA-512. ArrayBuffer to hex string. SHA-256 = 64 chars. Hardware-accelerated in modern browsers.

Tips & Best Practices

  • 1
    SHA-256 is most common
  • 2
    Compare full hash strings
  • 3
    Match publisher algorithm
  • 4
    Large files take a few seconds

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Frequently Asked Questions

QFile uploaded?
No, processed in browser via SubtleCrypto.
QWhy no MD5?
SubtleCrypto excludes MD5 due to vulnerabilities. SHA-256 is more secure.

About File Hash Viewer

File Hash Viewer is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.