CRC Checksum Calculator
Encoding & Encryption · Free Online Tool
Compute CRC-8/16/32 cyclic redundancy checks.
0x696A0231176855505701101001011010100000001000110001Lookup Tables
Precomputed 256-entry tables for fast byte-at-a-time CRC calculation.
Multiple Variants
CRC-8, CRC-16/CCITT-FALSE, CRC-16/Modbus, and CRC-32 (zlib/Ethernet) with correct params.
Real-Time
Checksums recompute on every keystroke and show hex, decimal, and binary forms.
How to Use CRC Checksum Calculator
- 1Enter or paste your data into the input field.
- 2Select the desired encoding, hashing, or encryption options.
- 3Click the action button to process your data.
- 4Copy the result from the output field.
Features
- ✓100% free — no signup, no subscription, no ads
- ✓Runs entirely in your browser — data never leaves your device
- ✓Fast and lightweight — instant results
- ✓Cross-platform — works on desktop, tablet, and mobile
Frequently Asked Questions
Is my data safe?
Yes. All encoding, hashing, and encryption operations run entirely in your browser. Your data is never sent to any server.
Can I use this for passwords?
We recommend using the Password Generator for creating secure passwords, and Bcrypt Hash for storing password hashes. Never store plain-text passwords.
What hash algorithms are supported?
The Hash Generator supports MD5, SHA-1, SHA-256, and SHA-512. For HMAC signatures, use the HMAC Generator.
Related Tools
X.509 Certificate Parser
Parse SSL/TLS certificates in PEM/DER and inspect fields.
Base64
Encode and decode Base64 with UTF-8 support.
URL Encoder
Percent-encode and decode URLs.
Unicode Converter
Convert text to Unicode escapes and back.
HTML Entity
Encode and decode HTML entities.
Number Base Converter
Convert between binary, octal, decimal, hex.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes.
HMAC Generator
Generate HMAC signatures with SHA algorithms.