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28+ essential tools for developers. No signup, no limits. All processing happens right in your browser — your data never leaves your device.

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JSON Formatter

Format, validate, and beautify JSON data with syntax highlighting

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Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 back to text

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URL Encoder/Decoder

Encode or decode URL components and query parameters

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Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text

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UUID Generator

Generate random UUIDs (v4) in bulk with one click

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Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates

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Color Converter

Convert colors between HEX, RGB, HSL formats with preview

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Regex Tester

Test regular expressions with real-time matching and highlighting

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Markdown Preview

Write Markdown and see the rendered preview side by side

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JWT Decoder

Decode and inspect JSON Web Tokens (header, payload, signature)

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QR Code Generator

Generate QR codes from text, URLs, or any data

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Lorem Ipsum Generator

Generate placeholder text in paragraphs, sentences, or words

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HTML Entity Encoder

Encode and decode HTML entities and special characters

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CSS Minifier / Beautifier

Minify or beautify CSS code for production or readability

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Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal

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Text Diff Checker

Compare two texts and highlight the differences

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Word Counter

Count words, characters, sentences, and paragraphs in text

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Password Generator

Generate secure random passwords with customizable options

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SQL Formatter

Format and beautify SQL queries for better readability

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Cron Expression Parser

Parse and explain cron expressions with next run times

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JSON ↔ YAML Converter

Convert between JSON and YAML formats instantly

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String Case Converter

Convert text between camelCase, snake_case, kebab-case, and more

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URL Slug Generator

Convert text to SEO-friendly URL slugs

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Chmod Calculator

Calculate Linux file permissions with interactive checkboxes

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Line Sort & Dedup

Sort lines, remove duplicates, reverse, shuffle, and more

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JS/HTML Formatter

Minify or beautify JavaScript and HTML code

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Image Base64 Converter

Convert images to Base64 strings and data URIs with drag & drop

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Git Command Generator

Visual Git command builder — select an action, fill in parameters, copy the command

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Why DevToolBox?

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Privacy First

All data is processed locally in your browser. Nothing is sent to any server.

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Instant & Fast

No loading, no waiting. Tools work instantly with zero latency.

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100% Free

No signup, no limits, no hidden fees. Free forever.

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Works Everywhere

Fully responsive. Use on desktop, tablet, or mobile.