CRC-16 XMODEM

Client

CRC-16/CCITT-FALSE (XMODEM) checksum.

0x31C3

Nearby workflows on Toolcore

  • CRC-16 Modbus — Modbus RTU CRC-16 over UTF-8 bytes. before you trust a token, digest, or key material in production.
  • CRC-32 & CRC-32C — IEEE CRC-32 and Castagnoli CRC32C on UTF-8 text or raw hex bytes—ZIP/PNG family vs iSCSI/protobuf; local only, complements file checksum for whole-file digests. before you trust a token, digest, or key material in production.
  • File checksum & hash — SHA-256, SHA-512, MD5, CRC-32, and more for a local file—verify downloads without uploading. before you trust a token, digest, or key material in production.
  • Encoding tools — Hub index: Base64 & URL, Base64url, Base32, Crockford, LEB128, ASCII85, Z85, Base58, base-36, bencode, Morse, quoted-printable, URI, Puny… before you trust a token, digest, or key material in production.

About this tool

CCITT polynomial 0x1021—file transfer protocols.

Common use cases

  • CRC-16 XMODEM for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

Related utilities you can open in another tab—mostly client-side.