Checksums 8 tools Browser only

Checksum & Non-Cryptographic Hashes

High-speed checksum algorithms for error detection and data validation. CRC variants, xxHash family, and Adler-32 running natively in your browser.

About Checksums

CRC algorithms and checksums provide fast error detection for data transmission and storage. They are not cryptographic and should not be used for security.

Runtime

All tools run locally in the browser using WebAssembly and JavaScript hash libraries.

A32

Adler-32

Calculate Adler-32 checksums online for zlib, deflate, and Zstandard compression integrity. Fast Fletcher-based error detection - faster than CRC32 for large data blocks.
CRC

CRC32

Free CRC32 calculator for ZIP files & network protocols. Checksum tool for IEEE 802.3 Ethernet - not for security. Calculate CRC32 online instantly.
CRC

CRC32C

Calculate CRC32C Castagnoli checksums online - hardware-accelerated error detection for SSDs, file systems, and Google Protocol Buffers. Intel SSE4.2 optimized CRC calculator for storage applications.
CRC

CRC64

Calculate CRC64 checksums online with ECMA-182 polynomial for large file transmission and storage systems. 64-bit error detection for network protocols and distributed storage.
H32

xxHash32

Calculate xxHash32 hashes online - fast 32-bit non-cryptographic hash optimized for 32-bit platforms and embedded systems. Lightweight high-speed checksum for IoT devices and legacy hardware.
H64

xxHash64

Calculate xxHash64 hashes online at RAM speed - ultra-fast non-cryptographic hash for databases and big data. High-performance checksum for hash tables and file deduplication.
H3

xxHash3

Calculate xxHash3 hashes online - next-generation ultra-fast hash with improved speed and quality. Modern non-cryptographic checksum with 64-bit and 128-bit output options.
H12

xxHash128

Calculate xxHash128 hashes online - 128-bit non-cryptographic hash with lower accidental collision probability than 64-bit variants. Ultra-fast checksum for large-scale distributed systems and content-addressed storage.

Checksums FAQ

Are checksums secure?

Checksums are designed for accidental error detection, not security. Use SHA-256, SHA-3, BLAKE3, HMAC, or KMAC when malicious tampering is possible.

Which checksum should I use?

Use the checksum required by your protocol or file format. CRC32 is common for legacy formats, while CRC32C is common in storage systems.