The file is read in browser memory and a new output is created without overwriting the original.
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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
QUICK ANSWER
What does this tool do?
Calculate SHA-256 for one or two files and compare integrity locally.
● Local workspaceInput stays in this tab
Output · review and verify
The result will appear here.
APPLICATION AND DECISION GUIDE
File Hash Calculator & Comparator: method and usage
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.
local file or files of a supported type within the disclosed size limit Confirm the shape first with a small example containing no personal data.
a downloadable new file, size and format metrics, and disclosed processing limits
Practical steps
- Choose one file up to 100 MB and optionally a second for comparison.
- Calculate SHA-256 on your device.
- Compare it with an expected value obtained through a separate trusted channel.
preserving the original and checking that output opens correctly, retains expected pages or frames, size, and visible quality
This is a pre-check, not a guarantee of identity, security, or regulatory compliance.
Suitable use cases
- Comparing a download with a publisher hash
- Checking whether file copies match
- Recording archive-delivery integrity
LEARN THE WORKFLOW
Guides for this tool
Safe Incident-Evidence Handover Without Uploading Logs
Hand over logs, diffs, and timelines with integrity and scope controls, without multiplying secrets.
Read guide →Local-App Resilience with Browser Storage and File Manifests
Do not treat offline data as unlimited: design quota, eviction, integrity, restore, and user-owned export together.
Read guide →ABOUT THIS TOOL
Frequently asked questions
What input does File Hash Calculator & Comparator accept?+
local file or files of a supported type within the disclosed size limit Choose one file up to 100 MB and optionally a second for comparison.
What does File Hash Calculator & Comparator return?+
a downloadable new file, size and format metrics, and disclosed processing limits The file is read in browser memory and a new output is created without overwriting the original.
How should I validate File Hash Calculator & Comparator output?+
preserving the original and checking that output opens correctly, retains expected pages or frames, size, and visible quality
Does File Hash Calculator & Comparator send or store input on a server?+
Tool input is processed in the active tab. Saving to the Workstation or transferring to another tool is a separate choice. Consider browser extensions and shared devices separately; the privacy page explains advertising and network connections.