CRC-16 Checksum Calculator

Compute CRC-16 checksums across common variants (MODBUS, CCITT…) — runs 100% in your browser. No data is uploaded; nothing leaves your device.

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Input text

Variant	Hex	Decimal
CRC-16/CCITT-FALSE	0x29B1	10673
CRC-16/XMODEM	0x31C3	12739
CRC-16/ARC (IBM)	0xBB3D	47933
CRC-16/MODBUS	0x4B37	19255
CRC-16/KERMIT	0x2189	8585

CRC-16 checksums for the most common polynomial variants (CCITT, XMODEM, MODBUS, Kermit…). The classic check value for "123456789" lets you confirm each variant. UTF-8 input. Runs entirely in your browser.

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Reach for CRC-16 Checksum Calculator whenever you need to compute CRC-16 checksums across common variants (MODBUS, CCITT…). Developers and sysadmins rely on it to verify download integrity, generate checksums for caching and deduplication, and learn how cryptographic fingerprints work — confirming a file or string was never altered.

How to embed CRC-16 Checksum Calculator on your website

Add this free tool to your own site, blog or intranet — it's 100% free to embed. Paste this snippet where you want the tool to appear; it loads a clean, self-contained version with no ads or navigation.

<iframe src="https://tooljolt.com/embed/crc16-calculator" title="CRC-16 Checksum Calculator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px" loading="lazy"></iframe>

About CRC-16 Checksum Calculator

CRC-16 Checksum Calculator is a free online hashing tool that lets you compute CRC-16 checksums across common variants (MODBUS, CCITT…). It runs entirely in your browser — no sign-up, no uploads and nothing ever sent to a server — so it is fast, private and safe to use with sensitive data. Whether you are a developer, security professional, student or just curious, CRC-16 Checksum Calculator gives you an instant, reliable result with zero setup.

How to use CRC-16 Checksum Calculator

1Enter or paste the text (or drop a file) into CRC-16 Checksum Calculator.
2The hash is computed instantly as you type — no button needed.
3Copy the resulting digest.
4Compare it against a published value to verify integrity.

Why use CRC-16 Checksum Calculator?

✓100% free with no sign-up, accounts, watermarks or usage limits
✓Runs entirely in your browser — your input never leaves your device, ideal for confidential security data
✓Verify file and data integrity in seconds
✓Standards-correct output you can match in OpenSSL, Node.js or Python
✓Works on any device with a modern web browser, online or offline

Frequently asked questions

Can I reverse a hash with CRC-16 Checksum Calculator?+

No. A hash is a one-way fingerprint — you cannot turn it back into the original input. CRC-16 Checksum Calculator only computes the hash; recovering the input requires brute-forcing candidate values.

What is CRC-16 Checksum Calculator useful for?+

Hashes verify file integrity, deduplicate data, index records and (for cryptographic hashes) underpin digital signatures and password storage. Compare the value here against a published one to confirm nothing was tampered with.

Is CRC-16 Checksum Calculator free to use?+

Yes. CRC-16 Checksum Calculator is 100% free with no sign-up, no account, no usage limits and no watermarks. Use it as often as you like.

Does CRC-16 Checksum Calculator upload my data to a server?+

No. CRC-16 Checksum Calculator runs entirely in your browser using JavaScript — nothing you type or upload ever leaves your device. That makes it safe to use with sensitive or confidential security data.