// open security tools — swiss made

Security tools
that work for
you.

A growing collection of free, browser-based security utilities. No sign-up. No telemetry. No servers. Your data stays exactly where it belongs — with you.

explore tools view source
12+ security tools
100% client-side
AES-256 encryption standard
0 bytes collected
// tools

Pick your tool.

↗
[~]
Text Encrypt / Decrypt
AES-256-GCM encryption in the browser. Passphrase-protected, authenticated, tamper-evident.
live aes-256-gcm pbkdf2
↗
[#]
Hash Generator
Instantly compute MD5, SHA-1, SHA-256, SHA-512 and BLAKE2 hashes for any text or file.
soon sha-256 blake2
↗
[*]
Password Analyzer
Entropy score, crack-time estimate, character analysis and HaveIBeenPwned breach check.
soon hibp entropy
↗
[%]
Secure Notes
End-to-end encrypted notes with self-destructing share links. Read once, gone forever.
soon e2e self-destruct
↗
[?]
JWT Decoder
Inspect, decode and verify JSON Web Tokens. See header, payload and signature at a glance.
soon jwt auth
↗
[!]
File Integrity
Drag and drop any file. Verify its hash against a known checksum to detect corruption or tampering.
soon checksum sha-256
↗
[+]
Encoder / Decoder
Base64, URL encoding, HTML entities and hex — convert between them all in one place.
soon base64 hex
↗
[&]
CIDR Calculator
Subnet masks, broadcast addresses, usable IP ranges and wildcard masks — instant network math.
soon ipv4 subnet
↗
[^]
Regex Tester
Test and debug regular expressions against live input with match highlighting and group inspection.
soon pcre patterns
[01]
Client-side only
Every operation runs inside your browser using native Web APIs. No data is ever sent to a server. There is no server.
[02]
Zero dependencies
No npm packages. No CDN-loaded libraries for crypto. No supply chain attack surface. Just the browser's own audited engine.
[03]
Open source
Every line of code is public. Audit it, fork it, deploy it yourself. Security through transparency, not obscurity.
[04]
Swiss-grade privacy
No cookies. No analytics. No fingerprinting. No advertising. A tool that respects the person using it.
// get started now

No account needed.
Just open and use.

All tools work offline once loaded.

$ curl -sL kryptar.ch && open index.html
→ Loading tools... no npm install required.
✓ All systems operational. Zero telemetry confirmed.
start encrypting →