DevArbor

Unit Converter

Convert length, weight, temperature, volume, area, speed, time, data, energy, and pressure with formulas.

Roman Numeral Converter

Convert numbers to Roman numerals and back with step-by-step explanation — includes date converter for tattoos.

Number Base Converter

Convert between binary, octal, decimal, hex, and any base 2–36 with step-by-step explanations and bitwise view.

Text Case Converter

Convert text to UPPER, lower, Title, camelCase, snake_case, kebab-case, and more — live counts and copy buttons.

Word Counter

Live word count, character count, reading time, keyword density, and social platform character limits.

Image Compressor

Compress JPEG, PNG, and WebP images in your browser — no upload, no watermark, batch compression with quality control.

PDF Merger & Splitter

Merge, split, and reorder PDF files entirely in your browser — no upload, no watermark, no file-size limit.

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates — live epoch clock, code snippets in 8 languages, batch converter.

Markdown Editor & Preview

Live GitHub-Flavored Markdown preview with autosave, HTML export, word count, and built-in cheatsheet.

JSON Formatter & Validator

Format, minify, or validate JSON instantly — precise error location and collapsible tree view. 100% client-side.

CSV to JSON Converter

Convert CSV to JSON or JSON to CSV with auto-detected delimiters, type inference, and live table preview.

Online Notepad

Free notepad with autosave, multiple tabs, dark mode, word count, and .txt download — notes stay in your browser.

Diff Checker

Compare two texts side by side with word-level highlighting — your text is never sent to any server.

Aspect Ratio Calculator

Solve for missing dimensions, simplify ratios, and get platform presets for YouTube, Instagram, and TikTok.

Color Picker

Get hex, RGB, HSL, and CMYK codes with shades, complementary palettes, and WCAG contrast checker.

HTTP Status Codes Reference

Plain-English meanings, common causes, and fix guides for every HTTP status code from 1xx to 5xx.

Emoji Copy & Paste

One-tap copy for 600+ emojis — search by name, recently used, skin tone picker, and multi-select mode.

Special Symbols Copy & Paste

Copy any of 800+ Unicode symbols — arrows, stars, hearts, math, currency — with instant search.

Keyboard Shortcuts Reference

Searchable keyboard shortcut cheat sheets for Excel, VS Code, Photoshop, Figma, Word, Gmail, Chrome, and more.

Email Signature Generator

Create a professional HTML email signature in 60 seconds — live preview, 4 templates, one-click copy for Gmail and Outlook.