TASK

Verify file or data integrity with a checksum

Compute a CRC32 or SHA-256 checksum of data and compare it against a known value to detect corruption or tampering.

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A checksum is a fixed-size digest of arbitrary data. If the data changes by even one bit, the checksum changes completely. Comparing checksums detects accidental corruption (CRC32) or intentional tampering (SHA-256).
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CRC32 Checksum →
For fast, non-cryptographic integrity checks (file transfer, ZIP entries), compute CRC32. It is a 32-bit checksum — fast but can miss some corruptions and provides no security.
3

Hash Calculator →
For cryptographic integrity (detecting deliberate tampering), compute SHA-256. A 256-bit hash makes it infeasible to find a different input with the same hash.
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Hash Compare →
Enter the computed hash and the expected hash. The tool compares them in constant time and reports match/mismatch — useful for automating verification scripts.

Frequently asked questions

CRC32 vs SHA-256 — which should I use?: Use CRC32 for accidental corruption detection in non-adversarial contexts (file transfer, storage). Use SHA-256 (or stronger) when an adversary could craft malicious data — CRC32 is trivial to forge. SHA-256 also has a much lower collision probability.
Can a checksum guarantee data is correct?: No. A matching checksum only means no detected change. Different inputs can share a checksum (collision). CRC32 collisions are common on large data; SHA-256 collisions are computationally infeasible but not impossible. For full assurance, use digital signatures.

Workflows that solve this

BLAKE Hash with CRC32 Checksum

Compute BLAKE hash then CRC32 checksum for integrity verification.

Hash content and encode as Base64

Compute a hash of the input and encode the hash digest as Base64 for compact transport.

Hash text and verify integrity

Compute a hash of the input text and compare it against an expected hash to verify integrity.

Hash text and verify with CRC32 checksum

Compute both a cryptographic SHA-256 hash and a CRC32 checksum for data integrity verification.

Format JSON and compute integrity checksum

Pretty-print a JSON document and compute a CRC32 checksum to detect any subsequent modifications.

MD5 Hash then Base58 Encode

Compute MD5 hash then encode as Base58 for compact representation.

Multi-hash speed comparison

Hash the input and benchmark multiple hash algorithms to compare their speed and output.

Generate Password and Hash

Generate a random password then hash it for secure storage.

SHA3-256 Hash with CRC32 Checksum

Compute SHA3-256 hash then CRC32 checksum for dual integrity verification.

SHA-512 Hash then Hex Encode

Compute SHA-512 hash then encode as hex for readability.

Reverse Text and Hash

Reverse text then compute SHA-256 hash of the reversed result.

Scramble Text and Hash

Scramble text then hash the scrambled result.

Learn more

Want to understand why?

How to Use CRC32

Compute CRC32 checksums for fast, non-cryptographic integrity checks.

Choosing a hash algorithm: digests, password hashing, and MACs are three different jobs

A field guide to SHA-2, SHA-3, BLAKE2, MD5, bcrypt/Argon2, and HMAC — which one fits integrity checks, password storage, and message authentication, and why they are not interchangeable.

CRC32 is a 32-bit cyclic redundancy check based on polynomial division over GF(2), used to detect transmission errors — not a cryptographic hash.

ACID is the four guarantees of transactions: atomicity, consistency, isolation, and durability, ensuring reliable transaction processing.

Related tools

Compute CRC32 checksum for data integrity verification. Free, private, and 100% client-side.

Hash Calculator

Compute MD5, SHA-1, SHA-256, or SHA-512 hashes with hex or Base64 output. Free, private, and 100% client-side.

Compare MD5, SHA-1, SHA-256, SHA-384, SHA-512 of the same input. Free, private, 100% client-side.