Files · Free browser tool
SHA-256 File Checksum Calculator
Calculate SHA-256, SHA-384, or SHA-512 for a file locally, compare it with an expected checksum, and copy the exact hexadecimal result.
Runs on this device
No file upload
Free to use
Private workspace
Verify file integrity with the browser’s cryptographic API without uploading the file or its contents.
Ready.
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Choose a file to begin
Verify file integrity with the browser’s cryptographic API without uploading the file or its contents.
Calculated locally
File checksum
SHA-256
A matching checksum confirms identical bytes, not that a file is safe.
What this tool does
A focused job, with a visible boundary.
Verify file integrity with the browser’s cryptographic API without uploading the file or its contents.
Optional expected-hash comparison
Copyable lowercase hexadecimal output
Know the limits
Local does not mean unlimited.
Browser processing protects the file from an upload workflow, but the browser, device, output format, and selected settings still matter.
- A matching checksum verifies bytes, not whether a file is safe or trustworthy.
- The expected checksum must come from a trustworthy independent source.
- Large files require memory and can take longer on phones.
Four local steps
How to use file checksum.
- 01
Choose the file whose bytes you want to verify.
- 02
Select SHA-256 unless the trusted source specifies another algorithm.
- 03
Optionally paste the expected hexadecimal checksum.
- 04
Compare or copy the locally calculated result.
Clear answers
File checksum questions.
Does hashing upload the file?
No. The browser reads the bytes and uses its built-in cryptographic digest function locally.
Does a matching hash prove a file is safe?
No. It proves the bytes match the expected checksum. If the expected value or original file is malicious, the hashes can still match.
Which algorithm should I use?
Use the algorithm published by the trusted source. SHA-256 is the most common default for modern file-integrity checks.