Calculate standard CRC-32 checksum for text
Input
123456789Example output
CBF43926Checksum Calculator
Security & Hashing100% Client-SideReady
TEXT
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0 B / 9.54 MB
Read-only
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About this tool, examples & FAQ
Calculate non-cryptographic checksums and cyclic redundancy checks including CRC-32 (IEEE 802.3), CRC-32C (Castagnoli), CRC-16 (IBM / ARC), Adler-32, and BSD sum. Verify transmission integrity and error detection with 100% client-side privacy.
Key facts
| Supported Checksums | CRC-32, CRC-32C (Castagnoli), CRC-16 (ARC), Adler-32, BSD Sum |
|---|---|
| Checksum Nature | Non-cryptographic error detection and transmission verification |
| Maximum Input | 10 MB |
| Execution Deadline | 3 s |
How to use
- Select your target checksum algorithm (CRC-32, CRC-32C, CRC-16, Adler-32, BSD Sum, or All).
- Choose your desired output notation format (Hex Uppercase, Hex Lowercase, Decimal, or Binary).
- Paste your text or data into the input pane and click Run (or press Ctrl/Cmd + Enter).
- View the generated checksum value or comprehensive multi-algorithm comparison table.
Examples
Compute Adler-32 checksum used by zlib compression
Input
123456789Example output
091E01DEEdge cases
Checksums vs Cryptographic Hashes
Checksums like CRC-32 and Adler-32 are designed for high-speed error detection against accidental transmission noise (bit flips). They are not cryptographically secure and should never be used for password hashing or tamper-proof digital signatures (use SHA-256 or SHA-512 instead).
CRC-32 (IEEE 802.3) vs CRC-32C (Castagnoli)
CRC-32 and CRC-32C utilize different generator polynomials (0xEDB88320 vs 0x82F63B78). While Ethernet and ZIP use standard CRC-32, modern storage systems and networking protocols (iSCSI, SCTP, Btrfs, ext4) prefer CRC-32C due to superior error-detection characteristics and hardware CPU instruction acceleration.
Multi-Byte Unicode UTF-8 Encoding
Characters outside ASCII 0-127 are encoded to UTF-8 byte streams before computing the checksum, ensuring deterministic parity across cross-platform systems and network sockets.
How it works
- Encodes input text into raw byte arrays using standard UTF-8 encoding.
- Applies optimized bitwise lookup tables (for CRC polynomials) and modulo arithmetic (for Adler-32) to compute checksums at memory speed.
- Formats output digests into uppercase hex, lowercase hex, decimal, or raw binary strings.
- Executes entirely within an isolated browser Web Worker without sending data to any external server.
Related workflows
Hash Generator
Generate cryptographic hashes and message digests including SHA-256, SHA-512, SHA-384, SHA-1, and MD5 for text payloads.
Gzip & Deflate Compressor / Decompressor
Compress raw text into Gzip, Deflate, or Deflate-Raw byte streams (encoded in Base64 or Hex), or decompress compressed payloads back to plain text.
Hex (Base16) Encoder / Decoder
Encode text to hexadecimal (Base16) byte strings and decode hex bytes back to UTF-8 text with customizable delimiters and prefixes.
Binary ↔ Text Converter
Convert text to 8-bit binary strings (Base2) and decode binary byte representations back to UTF-8 text.
Frequently asked questions
What is CRC-32?
CRC-32 is a 32-bit cyclic redundancy check algorithm that produces a fixed 8-character hexadecimal value based on polynomial division of data. It is widely used to detect data corruption in network packets, ZIP files, and PNG images.
What is Adler-32 and how does it compare to CRC-32?
Adler-32 is an algorithm invented by Mark Adler used in zlib compression. It calculates two 16-bit sums modulo 65521 and concatenates them into a 32-bit integer. It is computationally faster in software than CRC-32 but provides slightly less dispersion for short messages.
Are my strings or files uploaded to any server?
No. All checksum calculations occur purely within your browser memory. Nothing is transmitted over the network.
References
- IEEE 802.3 Carrier Sense Multiple Access with Collision Detection — Standard definition for 32-bit CRC generator polynomial
- RFC 1950: ZLIB Compressed Data Format Specification — Specification for the Adler-32 checksum algorithm