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
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.
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.
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.
Hex to CMYK Converter
conversion
Convert HEX colors to CMYK in your browser. Naive sRGB-based approximation for print previews. Free, no signup, your colors stay local.
Hex to HSL Converter
conversion
Convert any hex color to HSL in your browser — 3-digit, 6-digit, 8-digit alpha all supported. Free, instant, no signup, your colors never leave the page.
Hex to OKLCH Converter
conversion
Convert HEX to OKLCH for Tailwind v4 design tokens. Live perceptually-uniform output with Display P3 gamut warnings. Free, browser-only.
Hex to RGB Converter
conversion
Convert any hex color code to RGB in your browser — 3-digit, 6-digit, and 8-digit alpha hex all supported. Free, instant, no signup, your colors never leave the page.
Compress Images Online — JPEG, PNG & WebP
conversion
Compress JPEG, PNG, WebP & AVIF up to 80% smaller — in your browser, no upload. Batch 20 images, resize, compare before & after, download as ZIP. Free & private.
JSON Diff & Compare
encoding
Compare two JSON files instantly in your browser. Side-by-side highlighting, RFC 6902 JSON Patch output, ignore noisy fields like timestamps and IDs. 100% private, no upload.
Browse by Category
Find tools organized by their function
Encoding & Formatting
10 toolsConvert and format data between different encodings and formats
Security Tools
4 toolsHash generators, encryption utilities, and security validation tools
Date & Time
2 toolsUnix timestamp converters, timezone tools, and date formatters
Conversion Tools
12 toolsUnit converters, number system converters, and data transformation utilities
Text Processing
4 toolsText manipulation, string utilities, and content formatting tools
Latest from the Blog
Developer tutorials, guides, and insights
WCAG Color Contrast Ratio Guide: AA, AAA, and APCA Explained
Master WCAG contrast ratios. Learn 4.5:1 AA and 7:1 AAA thresholds, the APCA Lc algorithm, color blindness, and how to fix failing combinations.
camelCase vs snake_case vs kebab-case: 2026 Naming Conventions Guide
camelCase vs snake_case vs kebab-case 2026 — 6 case styles, 7-language decision matrix, acronym rules, URL slug SEO, and 6 conversion pitfalls.
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.