File Hash Checker
Calculate SHA-1, SHA-256, SHA-384, SHA-512 hashes for any file
File Hash Checker - Calculate SHA Checksums Online
Calculate cryptographic hashes for any file using the Web Crypto API. Our File Hash Checker computes SHA-1, SHA-256, SHA-384, and SHA-512 checksums instantly in your browser.
Select any file from your device—documents, images, videos, archives, executables, or any other file type. The tool reads the entire file in chunks and computes four cryptographic hash values simultaneously: SHA-1, SHA-256, SHA-384, and SHA-512. Progress is shown as the file is processed, which is especially useful for large files over 100MB. Once complete, all four hash values are displayed in hexadecimal format, ready to copy. Compare these values against published checksums to verify file integrity and detect tampering. The entire file is processed locally in your browser using the SubtleCrypto API—nothing is uploaded.
Software developers verify downloaded libraries or binaries match the official release by comparing SHA-256 checksums. Security researchers confirm malware samples are identical to reported specimens using hash matching. System administrators validate ISO images downloaded for server installations haven't been corrupted or modified. Users verify that files downloaded from torrents or mirrors are authentic by checking against published hashes. Digital archivists create checksums for long-term storage to detect bit rot or corruption over time. Forensic analysts compute file hashes for evidence integrity and chain-of-custody documentation.
SHA-1 is considered cryptographically broken for security purposes—use SHA-256 or higher for integrity verification. When sharing files, publish the hash on a different channel (e.g., HTTPS website) than the file download itself to prevent attackers from replacing both. Large files may take several seconds to hash—this is normal and indicates thorough processing. For critical security applications, verify the hash using two different tools to rule out implementation bugs. File modification of even a single bit produces a completely different hash, making checksums excellent tamper-detection mechanisms.
All processing happens directly in your browser. Your files never leave your device — no server uploads, no cloud storage, no data retention. The tool works offline once loaded, requires no registration, and is completely free with no usage limits.
Frequently Asked Questions
What is a file hash?
A file hash is a unique fingerprint generated from the file contents using a cryptographic algorithm. Even a tiny change in the file produces a completely different hash.
Which hash algorithm should I use?
SHA-256 is the most commonly used for file verification. SHA-1 is older and less secure. SHA-384 and SHA-512 offer stronger security.
Is the file uploaded anywhere?
No, all hash computation happens in your browser using the Web Crypto API. Your files never leave your device.
Why does MD5 not appear?
MD5 is not supported by the Web Crypto API and is considered cryptographically broken. We use SHA family algorithms which are more secure.