File Checksum
Compute SHA-1, SHA-256 and SHA-512 for any file — locally, never uploaded.
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use File Checksum
Follow these steps — everything happens instantly in your browser.
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Step 1. Drop a file (up to 512 MB) onto the upload zone — any file type works.
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Step 2. Wait for SHA-1, SHA-256 and SHA-512 to be computed with crypto.subtle.digest.
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Step 3. Copy any digest with the Copy button next to it.
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Step 4. Paste an expected hash and pick which algorithm to compare against to verify integrity.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about file checksum.
Encrypt & Decrypt Text
AES-GCM 256 encryption with a passphrase — round-trip in your browser.
Secure Notes
A local-only encrypted notepad — passphrase-locked with AES-GCM 256.
Password Strength Checker
Estimate entropy and crack time for any password — fully offline.
SSL Certificate Decoder
Decode a PEM certificate into subject, issuer, validity and serial — locally.