Checksum Calculator

Calculate and verify file checksums using CRC32, MD5, SHA-1, SHA-256, SHA-384, and SHA-512 algorithms.

Select Checksum Algorithms

CRC32 (32-bit)

MD5 (128-bit)

SHA-1 (160-bit)

SHA-256 (256-bit)

SHA-384 (384-bit)

SHA-512 (512-bit)

Calculate Checksum

Verify Checksum

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Algorithm

Expected Checksum

About Checksum Algorithms

CRC32 (32-bit)

Fast cyclic redundancy check. Commonly used for file integrity verification and error detection in network transmissions.

Fast but cryptographically broken. Still widely used for file checksums and non-security applications.

Deprecated for security use but still common in legacy systems and file verification.

Industry standard for security applications. Provides strong integrity verification.

Truncated version of SHA-512. Used when 256-bit isn't sufficient but 512-bit is too long.

Strongest option. Better performance on 64-bit systems compared to SHA-256.

Common Use Cases

File Downloads: Verify downloaded files match the publisher's checksum to ensure they weren't corrupted or tampered with.
Data Backup: Compare checksums before and after backup to verify data integrity.
Software Distribution: Generate checksums for distributed files so users can verify authenticity.
Duplicate Detection: Use checksums to identify identical files without comparing content byte-by-byte.