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Supported: PDF, JPEG, PNG, GIF, WebP, TIFF, BMP • Max 50MB
Computing SHA-256 hash...
✅ SHA-256 Hash Generated Successfully
💡 Important: Save this hash value! Use it later to verify your document has not been modified.
If even one character changes in the document, the hash will be completely different.
✅ Verify Document Integrity
Upload your document and enter the original hash to verify the document has not been modified. If the hashes match, the document is authentic.
Paste the hash that was generated when the document was first created.
📂
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Verifying document...
📖 How SHA-256 Hashing Works
1
Upload File
Select any PDF or image file. Processed locally — never uploaded to server.
2
SHA-256 Applied
Every byte of the file is processed through SHA-256 algorithm (FIPS 180-4).
3
Unique Fingerprint
A unique 64-character hex string is generated. Same file = always same hash.
4
Verify Anytime
Later, compare hashes to verify document was never modified.
🔒 Privacy Notice
✅ Your file is processed entirely in your browser. It is never uploaded to any server.
✅ SHA-256 is computed using the Web Crypto API built into your browser.
✅ No file data, hash values, or metadata are stored or transmitted.
✅ This service is completely free and requires no account or login.
Contract Verification
Verify a contract PDF has not been altered after signing.
Medical Records
Confirm medical document integrity for legal purposes.
Legal Documents
Verify legal files have not been tampered with.
Business Files
Confirm business agreements remain unchanged.
Research Data
Verify research documents for academic integrity.
Government Files
Official document verification for government agencies.