File Checksum
Hash a local file of 32 MB or less. Nothing is uploaded.
Rated 4.7 out of 5 based on 340 reviews
Chosen locally. Nothing is uploaded.
How to use file checksum
- Fill the fields or paste input in this tab.
- Set every option that changes the result, not only the defaults.
- Read the output. Invalid input shows an error in the status line.
- Copy or download the result. Nothing is sent to CZNull.
File Checksum
File Checksum
| Where it runs | This browser |
|---|---|
| Upload | None |
| Network | No request to compute the result |
| Limit | Invalid input stays on the page as an error |
What file checksum does
FileReader reads the bytes in this tab. Compare the digest to a published checksum. MD5 and SHA-1 are legacy only.
How this page works
All options on the form are sent into the local engine. Hash a local file of 32 MB or less. Nothing is uploaded. Results never leave this device to be computed.
Limits and related pages
Stay on this URL for this job. Sibling tools in the same group cover nearby jobs without mixing formulas. Open the category hub if you need a different input set.
Questions
Does this page upload what I type?
No. The work runs in the page you opened. CZNull does not receive the input.
Is a hash encryption?
No. Anyone can hash the same bytes and compare. You cannot recover the input from the digest.
When should I use HMAC?
When the digest must depend on a key as well as the message. CRC-32 has no HMAC on this site.
Empty input?
The empty byte string has a defined digest. That is not an error.