CRC32 Calculator & Verifier Online

Compute CRC-32 checksums locally in your browser. Supports text input and chunked file processing for large files, multiple output formats, verification & progress reporting.

Characters: 0
Uppercase
Characters: 0
HEX
—
DEC
—
Base64
—
Verify (paste expected CRC)

About CRC-32

CRC-32 (Cyclic Redundancy Check, 32-bit) is a checksum algorithm commonly used for error-detection in networks and storage. It is not cryptographically secure and should not be used for authentication.

What is CRC-32?

  • ✓ 32-bit checksum (4 bytes) for error detection
  • ✓ Uses polynomial 0xEDB88320 (IEEE 802.3 standard)
  • ✓ Deterministic & fast computation
  • ✓ Not cryptographically secure (use SHA-256 for security)

How to Use

  1. Enter text or upload a file (up to 500MB)
  2. The CRC-32 will compute automatically (if Live mode is on)
  3. Copy the result or verify against an expected value
  4. For large files, use Pause / Resume / Cancel controls

Technical Details

  • ✓ Implements standard CRC-32 (IEEE 802.3)
  • ✓ Chunked processing for large files (4MB chunks)
  • ✓ Multiple output formats (HEX, Decimal, Base64)
  • ✓ Verification against expected values
  • ✓ All processing happens in your browser