Processing boundary
Input is processed only in the active browser tab's memory and is not sent to a ByteQuant server.
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Privacy & security
File Hash Calculator & Comparator
Uses Web Crypto to create SHA-256 digests without uploading files and reports whether two files match byte-for-byte. A matching hash supports integrity checks but does not verify safety, provenance, or signer identity.
✓ Free✓ No account✓ In-browser
● Local workspaceInput stays in this tab
Output · review and verify
The result will appear here.
Persistent storage
Input and output are not stored. The optional usage counter keeps only tool identity and count, never content.
Verification
Output comes from disclosed rules or browser APIs and needs independent review before high-impact use.
A result in three steps
- 01
Choose one file up to 100 MB and optionally a second for comparison.
- 02
Calculate SHA-256 on your device.
- 03
Compare it with an expected value obtained through a separate trusted channel.
When is this tool useful?
- ✓ Comparing a download with a publisher hash
- ✓ Checking whether file copies match
- ✓ Recording archive-delivery integrity
Important limitation
Automated output is a preliminary assessment. Do not use it alone for legal, financial, medical, or security-critical decisions.
LEARN THE WORKFLOW
Guides for this tool
Data and File Integrity: JSON Schema, Image Resizing, and SHA-256
Build reviewable schemas from samples, resize images locally, and compare files with SHA-256.
Read guide →ABOUT THIS TOOL
Frequently asked questions
Does this tool send input to a server?+
No. Processing runs in this browser tab. Data leaves the page only when you choose to copy or download the result.
Is the result definitive?+
The tool produces consistent output from disclosed rules and browser APIs, but context, data quality, and method limitations can affect it. Verify high-impact decisions.
Is input saved?+
No. Tool input is not persisted. With consent, only tool identity and usage count may be kept on this device for personal shortcuts.