Developer tools that just work

Free, fast, and private. Every tool runs in your browser — no sign-up, no tracking.

Instant
Client-side
Offline-ready
JSON ToolsView all

JSON Validator

Validate JSON online instantly. Detect syntax errors, find line numbers, and debug malformed JSON with real-time feedback.

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JSON Formatter

Format, beautify, and minify JSON online. Tree view, JSON to YAML/TOML conversion, syntax highlighting, and instant copy.

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Encoding ToolsView all

Base64 Encoder / Decoder

Encode and decode Base64 strings online. Supports text, URL-safe mode, and file encoding with instant results.

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Generator ToolsView all

UUID Generator

Generate UUID v4 identifiers instantly. Bulk generation, one-click copy, and regenerate on demand.

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Generator Hub

Generate QR codes, strong passwords, random numbers, and Lorem Ipsum text. Multiple generators in one place.

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Markdown ToolsView all

Markdown Previewer

Preview Markdown with live rendering. GitHub-flavored Markdown, code highlighting, split view, and HTML export.

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Comparison ToolsView all

Compare Texts / Files

Compare two texts with inline highlighting. See additions, deletions, and word-level changes directly on the text.

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Security ToolsView all

JWT Decoder

Decode and inspect JWT tokens online. View header, payload, and expiration without any library.

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Testing ToolsView all

Regex Tester

Test regular expressions in real time. See matches highlighted, capture groups, and flags with instant feedback.

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Time ToolsView all

Cron Expression Generator

Generate and explain cron expressions visually. Build schedules with a UI and see the next run times.

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Timestamp Converter

Convert between Unix timestamps and human-readable dates. Supports seconds, milliseconds, and multiple formats.

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Date Difference Calculator

Calculate the exact difference between two dates in years, months, days, weeks, and hours. Also works as an age calculator.

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Time Zone Converter

Convert times between time zones instantly. World clock with multiple cities, meeting planner, and DST-aware conversions.

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Design ToolsView all

Color Picker & Converter

Pick colors and convert between HEX, RGB, HSL, and HSB formats. Visual picker with live preview and copy support.

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Text ToolsView all

Text & String Utilities

Transform text: uppercase, lowercase, reverse, camelCase, slug, trim, count characters, words, lines, and more.

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Productivity ToolsView all

Notepad

Browser-based notepad with multiple notes, titles, and auto-save. Create, organize, and find your notes anytime.

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Conversion ToolsView all

Unit Converter

Convert between units of length, weight, temperature, volume, speed, and more. Instant, accurate, and easy to use.

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cURL Converter

Convert cURL commands to JavaScript, Python, Java, PHP, C#, Ruby, Rust, Go, Swift, Kotlin, PowerShell, Axios, or HTTPie code.

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