Developer Tools That Run in Your Browser
Free. Fast. Secure. No tracking. All processing happens locally in your browser. Your data never leaves your device.
Popular Tools
Most used developer utilities and converters
AES Decryption Tool — OpenSSL & CryptoJS Compatible
security
Decrypt AES online — GCM/CBC/CTR, passphrase or raw key, auto-detects OpenSSL & CryptoJS "U2FsdGVkX1" format. 100% in-browser, keys never leave the page.
AES Encryption Tool — GCM, CBC & CTR
security
Free online AES encryption — AES-128/192/256, GCM/CBC/CTR, passphrase (PBKDF2) or raw key. Runs 100% in your browser; nothing is uploaded.
Number Base Converter — Binary, Hex, Decimal & Octal
conversion
Convert between binary, hex, decimal, octal and any base (2-36) instantly. Free, private — all processing in your browser.
Base64 Decoder & Encoder
encoding
Decode and encode Base64 online for free. Real-time conversion with full UTF-8 and emoji support. 100% private — runs in your browser. No signup needed.
Base64 to Image Converter
encoding
Decode a Base64 string or data URI back into an image in your browser. Preview, read dimensions & MIME, then download as PNG, JPG, GIF, SVG. No upload.
Bcrypt Hash Generator & Verifier
security
Generate and verify bcrypt password hashes online — adjustable cost, $2b$/$2a$/$2y$ prefixes. 100% in your browser; your password is never uploaded.
Case Converter — UPPERCASE, lowercase, camelCase & More
text
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and 6 more formats instantly. Free, browser-only, no signup.
Color Converter — HEX, RGB, HSL & OKLCH
conversion
Convert HEX to RGB, HSL, OKLCH, OKLAB and CMYK in your browser — copy any format with one click. Free, no signup, your colors never leave the page.
Crontab Generator & Cron Expression Builder
datetime
Build, validate, and decode cron expressions in your browser. Live next-run preview in local time or UTC. POSIX 5-field syntax, presets, plain-English description. Free, private, no signup.
CSS Formatter, Beautifier & Minifier
code
Format, beautify and minify CSS instantly in your browser. Clean up messy stylesheets or compress them to ship — free, private, and your CSS never leaves your device.
CSV to JSON Converter
encoding
Convert CSV to JSON in your browser. RFC 4180, type inference, header row, big-int safe. 100% private, no upload.
cURL Command Generator & Builder
web
Build curl commands in your browser — set method, headers, auth, and body, get a copy-ready command instantly. Presets for Bearer, POST JSON, file upload. Free, private, no signup.
Browse by Category
Find tools organized by their function
Encoding & Formatting
30 toolsConvert and format data between different encodings and formats
Security Tools
17 toolsHash generators, encryption utilities, and security validation tools
Date & Time
2 toolsUnix timestamp converters, timezone tools, and date formatters
Conversion Tools
14 toolsUnit converters, number system converters, and data transformation utilities
Text Processing
8 toolsText manipulation, string utilities, and content formatting tools
Web & API
3 toolsBuild curl commands, inspect HTTP, and debug API requests in your browser
Code
4 toolsFormat, minify and escape code right in your browser — no uploads, no tracking.
Latest from the Blog
Developer tutorials, guides, and insights
JSON to Python: dataclass, Pydantic & TypedDict (2026 Guide)
Convert JSON to Python classes the right way: dataclass vs Pydantic v2 vs TypedDict, correct Optional typing, camelCase aliases, and pitfalls. Try it free.
JSON to Rust Struct: Generate serde Structs (2026 Guide)
Convert JSON to Rust structs the right way: number types (i64/u64/f64), Option for nulls, serde rename for camelCase, plus pitfalls to avoid. Try it free.
Your Data Stays Private
All processing happens in your browser — nothing is sent to external servers. No tracking, no cookies, no data collection. Most tools even work offline.