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Popular Tools
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Character Counter Count characters, bytes, and manuscript units with space options
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Text Diff Highlight differences between two texts line-by-line or word-by-word
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Age Calculator Calculate Korean full age, international age, and zodiac sign from birthdate
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D-Day Calculator Calculate D-day countdown and elapsed days between two dates
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Korean Salary Calculator 2026 Korean take-home pay after insurance deductions and income tax
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Markdown Viewer Live-render Markdown with instant split-pane preview
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JSON Formatter / Validator Format, minify, and validate JSON with error location highlighting
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QR Code Generator Generate QR codes from text or URLs with PNG download
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Image Compressor / Resizer Compress and resize images in the browser — no server upload
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Linux Commands Cheatsheet Essential Linux commands for files, permissions, processes, and networking
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Crontab / Cron Reference Crontab commands, schedule expressions, and common scheduling examples
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npm Commands Cheatsheet npm package management, scripts, npx, and yarn/pnpm equivalents
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Text
HOT
Character Counter Count characters, bytes, and manuscript units with space options
Case Converter Convert text to UPPER, lower, Title, camelCase, snake_case instantly
HOT
Text Diff Highlight differences between two texts line-by-line or word-by-word
Korean Dummy Text Generator Generate Korean lorem ipsum with custom paragraph and sentence counts
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Calculators
HOT
Age Calculator Calculate Korean full age, international age, and zodiac sign from birthdate
HOT
D-Day Calculator Calculate D-day countdown and elapsed days between two dates
Percentage Calculator Calculate percentages, ratios, discounts, and percent change in 4 modes
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Korean Salary Calculator 2026 Korean take-home pay after insurance deductions and income tax
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Developer
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Markdown Viewer Live-render Markdown with instant split-pane preview
HTML Viewer Preview HTML code in a sandboxed frame instantly
CSV Viewer Visualize CSV data as a table with auto-detected delimiter
SVG Viewer Preview SVG code with live rendering and download
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JSON Formatter / Validator Format, minify, and validate JSON with error location highlighting
Base64 Encoder / Decoder Encode or decode text and files to/from Base64
URL Encoder / Decoder Encode and decode URLs with encodeURI / encodeURIComponent distinction
UUID Generator Generate bulk UUID v4 values with case and hyphen options
Color Converter Convert between HEX, RGB, and HSL with a live color preview
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Image / Generate
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Commands
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Linux Commands Cheatsheet Essential Linux commands for files, permissions, processes, and networking
ADB Commands Cheatsheet Android Debug Bridge commands for connecting, installing, and logging
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Crontab / Cron Reference Crontab commands, schedule expressions, and common scheduling examples
Git Commands Cheatsheet Git commands for commits, branches, undoing changes, and remotes
Docker Commands Cheatsheet Docker commands for images, containers, and Docker Compose
Vim Shortcuts & Commands Essential Vim shortcuts for navigation, editing, search, and split windows
Windows CMD Commands Command Prompt commands for files, system, network, and user management
SQL Syntax Cheatsheet SQL syntax from SELECT and JOIN to aggregation and table management
Conda Commands Cheatsheet Conda virtual environment creation, package management, and environment.yml
pip Commands Cheatsheet Python package installation, requirements.txt, and venv basics
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npm Commands Cheatsheet npm package management, scripts, npx, and yarn/pnpm equivalents
curl Commands Cheatsheet curl options for GET/POST, headers, auth, file download, and more
SSH Commands Cheatsheet SSH connection, key generation, SCP file transfer, and port forwarding
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