File checksum calculator

Hash the exact bytes of a local file.

On your device · No account

Privacy details

File checksum calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

Copy link includes the inputs you choose to share in the address. Anyone with that link can reopen them. Files and generated results are excluded. Password and key tools share settings only.

Choose a file on this device

Hash algorithm

Expected hash (optional)

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-20

File checksum calculator explained

Choose a local file to hash its exact bytes with SHA-256, SHA-384 or SHA-512. An optional expected digest is compared after removing whitespace, making it easy to check a publisher’s checksum.

Next: Hash generator checker

A worked example

The three bytes for abc have SHA-256 ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad. A trailing newline changes the bytes and therefore changes the digest.

Before you use the result

A matching hash establishes equality with the expected digest, not that the file or publisher is trustworthy. The expected hash must come from a trusted source. Files stay on this device. This tool loads one file into memory, with a 100 MiB limit.

Cite this page

Citation style

ToolOctopus. “File checksum calculator.” Updated 2026-09-20. https://tooloctopus.com/file-checksum-calculator.

Add an access date if your instructions require one.

Citation formatting uses citeproc-js by Frank Bennett and Citation Style Language styles. Licence and source code.