Processed on this device
2FA & OTP
TOTP Generator
Generate time-based one-time passwords in your browser.
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SFranKey ToolsUseful tools.Private by default. Runs locally. No sign-in. Fast, clear, secure.
A focused toolbox for 2FA, passwords, QR codes, hashing and everyday development tasks. Sensitive values stay in your browser.
✓Runs locally✓No account✓VI · EN
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on-device tools
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network-required tools
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account required
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Processed on this device
Passwords
Password Generator
Create strong random passwords with browser CSPRNG.
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Processed on this device
2FA & OTP
QR 2FA Scanner
Read an otpauth QR code locally and inspect its settings.
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Processed on this device
QR Code
QR Code Generator
Generate QR codes for text, links, Wi-Fi and contact data.
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Processed on this device
Encoding & Hashing
File Checksum
Compare a local file digest with a publisher checksum.
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Processed on this device
Developer
JSON Formatter
Format, minify and validate JSON with useful error locations.
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Tool Directory
View all (23)→Explore by category
01
2FA & OTP
2 toolsTwo-factor authentication & real-time time-based OTP codes
02
Passwords
2 toolsCSPRNG random password generator & offline entropy audit
03
QR Code
2 toolsVector QR generator & camera scanner with SVG/PNG exports
04
Encoding & Hashing
3 toolsBase64 codecs, SHA/MD5 cryptographic hashes & file digests
05
Developer
4 toolsJSON formatter, JWT decoder, UUID generator & developer suite
06
Network intelligence
10 toolsIP diagnostics, network ping, DNS lookup & connectivity checks
Zero-Knowledge Architecture
Your sensitive data never leaves your device.
On-device tools keep sensitive values in your browser. Network diagnostics disclose their data boundary and run only after your action.
100% In-Memory Browser Execution
Passwords, OTP tokens, private keys, JSON strings and hash digests execute locally via Web Crypto API in browser memory.
Transparent Network Boundary
Zero hidden telemetry or background uploads. Network diagnostic tools only send requests upon explicit user action.
Zero Persistence & No Tracking
No cookies or tracking on sensitive inputs. Closing the tab immediately purges all temporary workspace state.
ON-DEVICE PIPELINE
0 Network Calls1. User input
Secret keys, passwords, local files
2. Browser memory
Web Crypto API · Isolated in-RAM execution
3. Local result
Instant output · Cleared cleanly on tab close
RAM Context: ISOLATEDWebCrypto: CSPRNG
> [INPUT] Capturing raw input in isolated client memory
Personal Workspace
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Community & Feature Requests
Need a new tool to speed up your workflow?
SFranKey continuously builds 100% free, on-device developer & security utilities. Tell us what tool you need next and we'll build it!
100% On-Device & Private
Zero intermediary servers or data logging
Open Source & Free Forever
Built transparently for the developer community
Fast Turnaround on Requests
Reviewed & developed continuously with community