A PDF hash generator computes a cryptographic SHA-256 fingerprint of your PDF file. This unique fingerprint changes if even a single byte of the file is modified — making it the standard method for verifying document integrity, detecting tampering, and confirming authenticity.
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SHA-256 Hash
How to Generate and Verify a PDF Hash
A cryptographic hash turns any file into a short unique fingerprint. The SHA-256 algorithm — used by governments, banks, and software publishers worldwide — produces a 256-bit fingerprint that changes completely if even one byte of the file is modified.
Generating a Hash
Drop your PDF onto the upload area or click "Choose File." The hash is computed instantly using the Web Crypto API built into your browser — no external libraries required. The computation runs entirely locally; your file is never uploaded or transmitted anywhere.
Sharing a Hash for Verification
Copy the hex hash and share it alongside your document — in an email, a footer, or a separate verification file. When the recipient receives the PDF, they can drop it into this PDF hash generator and confirm the hash matches exactly. Any modification — added metadata, watermarks, altered text — changes the hash.
Verifying a Hash You Received
Drop the PDF you received into the tool. Compare the generated hash to the reference hash you were given. They should match character for character. If they differ, the file has been modified since the hash was generated.
Command-Line Equivalents
This tool generates standard SHA-256 hashes identical to built-in OS tools. On Windows: certutil -hashfile document.pdf SHA256. On macOS/Linux: shasum -a 256 document.pdf. Results will match exactly.
FAQ
What is a file hash used for?
A cryptographic hash is a unique fingerprint for a file. If even a single byte changes, the hash changes completely. Share the hash alongside your PDF — recipients can run this tool on the file they received and confirm it matches, verifying the document is authentic and unaltered.
Can two different PDFs have the same SHA-256 hash?
Theoretically possible but astronomically unlikely. SHA-256 produces a 256-bit value — with 2^256 possible outputs, the probability of a collision (two different files producing the same hash) is effectively zero for any practical purpose. SHA-256 is considered collision-resistant.
What's the difference between SHA-256 hex and base64?
Both represent the same hash value, just encoded differently. Hex uses characters 0-9 and a-f, producing a 64-character string. Base64 uses a larger character set and produces a shorter 44-character string. Hex is more common for hash verification; base64 is used in some security protocols.
Why isn't MD5 included?
MD5 is not available in the Web Crypto API (it's been excluded because it has known security weaknesses). For file integrity verification, SHA-256 is the appropriate standard — it's secure and widely used for software distribution, digital signatures, and document verification.
Is my PDF file uploaded to any server?
No. The hash is computed entirely in your browser using the Web Crypto API (SubtleCrypto), a browser built-in. Your file never leaves your device, making this safe for confidential documents, contracts, and sensitive files.
How can I verify a hash someone gave me?
Drop your PDF into this tool, copy the generated SHA-256 hash, and compare it character-by-character to the reference hash you were given. They should match exactly. Most operating systems also have built-in hash tools: on Windows use 'certutil -hashfile file.pdf SHA256', on Mac/Linux use 'shasum -a 256 file.pdf'.