Developer Tools
Privacy-first developer tools that run entirely in your browser. No data collection, no tracking, available at no cost.
Recent Articles
View All →How to Decrypt AES-256-GCM Locally
Decrypting AES-256-GCM is straightforward when you have the password and the right metadata. Here is the exact workflow—and the mistakes that break decryption.
bcrypt vs Argon2: Password Hashing
bcrypt has protected passwords for decades; Argon2 is the modern, memory-hard recommendation. Here is how they compare and when to use each in 2026.
CSS Minifier Guide: Shrink Stylesheets
CSS is mostly whitespace and comments by weight. A minifier removes both — and a good one knows exactly what must survive.
Certificate Decoder Guide: Read X.509 Details
Every TLS handshake starts with a certificate. Decode the fields that matter: subject, issuer, validity, public key, and fingerprints — locally.
Featured Tools
QR Code Tool
Make QR codes that actually stay private. Your WiFi password, contact info—none of it leaves your browser.
Image Compressor
Compress images directly in your browser. Reduce file size while maintaining quality. Images stay on your device.
Secure Password Generator
Generate cryptographically secure passwords in your browser. Client-side using Web Crypto API. Your passwords stay on your device.
All Tools
QR Code Tool
Make QR codes that actually stay private. Your WiFi password, contact info—none of it leaves your browser.
Image Compressor
Compress images directly in your browser. Reduce file size while maintaining quality. Images stay on your device.
Secure Password Generator
Generate cryptographically secure passwords in your browser. Client-side using Web Crypto API. Your passwords stay on your device.
JSON Formatter & Validator
Format, validate, and minify JSON data with syntax highlighting. RFC 8259 compliant parser. Processing happens locally in your browser.
Markdown Preview
Live Markdown preview with GitHub Flavored Markdown support. Renders tables, code blocks, and task lists. Processing client-side.
Base64/URL/Hex Encoder Decoder
Base64/URL/Hex encoder and decoder. Zero-knowledge tool—runs locally in your browser.
SHA-256 Hash Generator
Generate SHA-256, SHA-1, or MD5 hashes for text and files. Verify file integrity without uploading anything. Your files stay on your device.
UUID Generator
Generate cryptographically secure UUIDs (v1, v4, v7) in your browser. Zero-knowledge, client-side only.
AES-256-GCM Encryptor
Client side aes encryption tool. Encrypt text or files using AES-256-GCM with PBKDF2 key derivation. Your data stays in your browser.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds precision. ISO 8601 compliant output.
JWT Decoder Online
JWT decoder without verification. Safely decode JWT tokens to inspect Header and Payload. Read-only — no signature validation. Your tokens stay in your browser.
Text Analyzer
Analyze text with detailed character, word, and line statistics. Supports Unicode counting and whitespace analysis.
Text Diff Tool
Compare two texts and highlight differences. Line-by-line and character-level diff. Useful for code review and document comparison.
HMAC Calculator
Calculate HMAC signatures using SHA-256, SHA-1, or MD5 entirely in your browser. Zero-knowledge architecture, no key transmission.
Regex Tester
Test regular expressions live in your browser. See every match with groups and indices, with support for common flags. Zero-knowledge, client-side only.
Cron Expression Builder & Next-Run Calculator
Validate five-field cron expressions and preview the next run times in local and UTC time. Everything runs in your browser — no schedules are sent anywhere.
CSV ↔ JSON Converter
Convert CSV to JSON and back with quoted-field support, delimiter detection, and live preview. Everything runs in your browser.
RSA Key Pair Generator
Generate RSA-OAEP key pairs in your browser and export them as PEM (SPKI public key, PKCS#8 private key). Keys never leave your device.
Color Converter & Contrast Checker
Convert colors between HEX, RGB, and HSL, and check WCAG contrast ratios for accessible text. All conversion happens in your browser.
Certificate Decoder: Inspect X.509 Certificates Locally
Parse PEM certificates in your browser and inspect subject, issuer, validity, public key, extensions, and SHA-256/SHA-1 fingerprints. Certificates never leave your device.
CSS Minifier & Formatter
Minify or beautify CSS in your browser. Comments, whitespace, and license blocks are handled safely. Nothing is uploaded.