About CRC Checksum Calculator
A Cyclic Redundancy Check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data.
Input: binary bytes (text input uses UTF-8; a file retains its original bytes). Output: text.
Format reference: CRC Checksum background and specification
Example
Use “Try example” to load this public sample and its settings, then run it.
Settings used in this example
| Parameter | Example value | Input and choices |
|---|---|---|
| Algorithm | "CRC-16" | Text172 Available choices
|
| Width (bits) | {"option":"Decimal","string":"0"} | Key/text encoding: Decimal |
| Polynomial | {"option":"Hex","string":"0"} | Key/text encoding: Hex |
| Initialization | {"option":"Hex","string":"0"} | Key/text encoding: Hex |
| Reflect input | True | True, False |
| Reflect output | True | True, False |
| Xor Output | {"option":"Hex","string":"0"} | Key/text encoding: Hex |
Input
The ships hung in the sky in much the same way that bricks don't.
Result
0c70
Parameters
| Parameter | Default value | Input and choices |
|---|---|---|
| Algorithm | "Custom" | Text172 Available choices
|
| Width (bits) | {"option":"Decimal","string":"0"} | Key/text encoding: Decimal |
| Polynomial | {"option":"Hex","string":"0"} | Key/text encoding: Hex |
| Initialization | {"option":"Hex","string":"0"} | Key/text encoding: Hex |
| Reflect input | True | True, False |
| Reflect output | True | True, False |
| Xor Output | {"option":"Hex","string":"0"} | Key/text encoding: Hex |
Before interpreting the result
Use a checksum to compare exact bytes against a trusted digest. Choose a password hashing function for passwords and a MAC for keyed authentication. MD5 and SHA-1 are unsuitable for new security-sensitive designs.
How to use this page
- Paste your input or open a local file.
- Adjust tool options if needed, then choose Run tool.
- Copy the result or download the original output bytes.
Inputs and results are not added to the public catalogue or saved in the URL. Processing happens in your browser; HTTP Request and DNS over HTTPS send the requests you explicitly run. Files up to 128 MiB can be opened; decompression and image tools may have smaller processing limits. Large results have a shortened preview. Text and HTML downloads use UTF-8; binary downloads preserve output bytes. Pasted text follows browser newline handling; open a file when exact input bytes matter.