Hash Generator

Security

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files. Compare hashes, view all algorithms at once, and switch between cases.

What is a cryptographic hash?

A cryptographic hash function takes any input — a string, a file, or a stream of data — and produces a fixed-length hexadecimal string called a digest. The same input always produces the same hash, but even a tiny change in the input produces a completely different hash (the avalanche effect). Hash functions are one-way: you cannot reverse a hash back to the original input. This makes them essential for verifying file integrity, storing password digests, creating digital signatures, and detecting data tampering. This tool uses the Web Crypto API built into your browser, so your data never leaves your device.

SHA algorithm comparison

SHA-1 produces a 160-bit (40-character) hash. It is deprecated for security purposes due to known collision attacks but is still used in Git commit hashes and legacy systems. SHA-256 produces a 256-bit (64-character) hash and is the most widely used algorithm today — it secures Bitcoin, TLS certificates, and most integrity verification systems. SHA-384 and SHA-512 produce longer hashes (96 and 128 characters respectively) and offer higher security margins for applications that need them. For most use cases, SHA-256 provides the best balance of security and performance.

Common use cases for hash generation

Developers use hashes to verify file downloads (comparing a computed checksum against the publisher's listed hash), check data integrity after transfers, create cache keys and ETags for HTTP caching, generate content-addressable storage identifiers, validate API webhook signatures (HMAC-SHA256), and audit password storage implementations. The file hashing feature lets you drop any file and compute its hash instantly, which is especially useful when verifying ISO images, software packages, or firmware updates.

Frequently Asked Questions

Is my data uploaded to a server?

No. All hashing happens entirely in your browser using the Web Crypto API. Your text and files never leave your device — there are no network requests during hashing.

Which algorithm should I use?

SHA-256 is the standard choice for most use cases. Use SHA-1 only for compatibility with legacy systems like Git. Use SHA-512 when you need a longer hash or when mandated by a specific protocol or compliance requirement.

Can I verify a downloaded file's integrity?

Yes. Switch to File mode, drop the file, and the tool computes its hash. Then use the Compare feature to paste the expected hash from the download page — the tool shows a clear match or mismatch indicator.

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