File Integrity & Checksum Verifier
Verify downloaded files and check software authenticity with client-side cryptographic hashing. 100% private, zero uploads.
Select or Drop any file to compute checksum
Processed 100% locally in your browser memory. Your files are never uploaded to any server.
Step-by-Step Instructions
Upload File to Inspect
Select or drag-and-drop any local file into the integrity scanner.
Compute Cryptographic Checksums
Generate cryptographic checksum hashes across SHA-256, SHA-512, MD5, and SHA-1 using client-side Web Crypto.
Paste Vendor Checksum to Compare
Paste the official published checksum from the software vendor or package repository.
Verify Verification Result
View instant Match (Green) or Mismatch (Red) validation confirming byte-for-byte file authenticity.
Key Features & Capabilities
- Client-side hashing via native Web Cryptography API (`crypto.subtle.digest`) with zero file upload to servers
- Instant checksum computation for SHA-256, SHA-512, SHA-384, SHA-1, and MD5
- Side-by-side automated string comparison highlighting exact byte discrepancies
- Support for large binary files (ISO images, OS installers, ZIP archives, software binaries)
Frequently Asked Questions
Why should you verify a file's SHA-256 checksum before running it?
Verifying a cryptographic checksum (like SHA-256) proves two critical things: 1) **Data Integrity**: the file was downloaded completely without corruption or missing packets; 2) **Security / Authenticity**: the file has not been tampered with or modified by a man-in-the-middle (MITM) attack or malware injection, guaranteeing it matches the vendor's official build.
Is my file uploaded to your server during checksum verification?
No. The file integrity checker runs 100% locally inside your browser using the browser's hardware-accelerated Web Crypto API. The file is read directly from your local disk into memory; zero bytes of file data are ever transmitted over the network.
What should you do if the calculated checksum does not match the vendor's checksum?
If the checksum does not match exactly, **do not open or execute the file**. A mismatched checksum indicates the download was corrupted or the file was modified. Delete the file and re-download from an official HTTPS mirror.
How do uppercase vs lowercase letters affect checksum verification?
Cryptographic hash digests are hexadecimal numbers where letters (A–F) represent values 10–15. Checksum comparisons are case-insensitive (`a1b2` equals `A1B2`). Our checker automatically normalizes casing before comparison.
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