# What Is a Hash and Why Should You Verify It
A cryptographic hash is like a fingerprint for a file. SHA-256 always produces exactly 64 hexadecimal characters regardless of whether the file weighs 1 KB or 50 GB. If anyone modifies even a single bit of the file, the resulting hash is completely different. This makes the hash the most reliable integrity-verification mechanism available. 256 Security bits
64 Hex characters
100% Private & Local
# Use Cases: When to Verify the Hash
Situations where verification matters
Downloads of Linux distributions (Ubuntu, Debian, Fedora publish their SHA-256 checksums).
Security software, VPNs, and password managers that publish official hashes.
Critical backups: confirm that the backup file has not been corrupted.
Files sent over untrusted networks where integrity may be compromised.
Software audits: confirm that an executable has not been modified since publication.