✨ 100% Free & Privacy-First

Developer Toolbox

50+ powerful online developer tools in one place. JSON formatter, Regex tester, Base64 encoder, QR generator, Markdown editor, and more. Everything runs in your browser — no server, no signup, no tracking.

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Instant & Fast

All tools run directly in your browser with zero server latency. Get instant results every time.

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Privacy First

Your data never leaves your device. 100% client-side processing with end-to-end privacy.

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50+ Tools

From JSON to Regex, QR codes to CSS generators — everything a developer needs in one toolkit.

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Multi-Language

Available in 10+ languages with a clean, responsive interface for every device.

Why Choose Developer Toolbox?

The all-in-one toolkit trusted by thousands of developers worldwide

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JSON Formatter & Validator

Format, beautify, minify, and validate JSON data instantly in your browser with syntax highlighting and tree view.

→ Generate

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Base64 Encoder & Decoder

Encode text and files to Base64 or decode Base64 strings back to original content with instant client-side processing.

→ Generate

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Text Case Converter

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, and more.

→ Generate

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UUID Generator

Generate RFC 4122 compliant UUIDs v1, v4, and v7 instantly. Bulk generate from 1 to 10,000 unique identifiers with one click.

→ Generate

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String Concatenation

Join and merge multiple text segments or strings into one with a custom separator.

→ Generate

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Hash Generator & Checksum

Compute MD5, SHA-1, SHA-256, SHA-384, SHA-512 checksums for text and files. Verify file integrity with cryptographic hash functions.

→ Generate

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Chinese to Pinyin Converter

Convert Chinese characters to Pinyin with support for tone marks, no tones, and first letter output formats.

→ Generate

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URL Encoder & Decoder

Percent-encode and decode URL strings safely. Handle special characters, query parameters, and path segments according to RFC 3986.

→ Generate

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Full-width / Half-width Converter

Convert between full-width and half-width characters including letters, numbers, and punctuation marks.

→ Generate

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Markdown Editor with Live Preview

Write and edit Markdown with real-time side-by-side preview, syntax highlighting, and toolbar for common formatting operations.

→ Generate

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Traditional / Simplified Chinese Converter

Convert between Simplified Chinese, Traditional Chinese, and Martian text with support for multiple Traditional variants.

→ Generate

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Regex Tester & Debugger

Test regular expressions live with match highlighting, group capture display, and detailed regex execution explanation.

→ Generate

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Remove HTML Tags

Strip all HTML tags from text and preserve pure text content, with optional line break and paragraph retention.

→ Generate

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Unix Timestamp Converter

Convert between Unix timestamps epoch and human-readable dates. Support for seconds, milliseconds, and microseconds.

→ Generate

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HTML / JS / CSS Code Filter

Filter or extract HTML, JavaScript, and CSS code from text, separating code from regular text.

→ Generate

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Color Converter & Picker

Convert colors between HEX, RGB, RGBA, HSL, HSLA, HSV, and CMYK formats with interactive color picker.

→ Generate

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HTML Unescape / Decode

Decode HTML entities like &lt; &gt; &amp; back to their original special characters.

→ Generate

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QR Code Generator

Generate fully customizable QR codes with logo embedding, color customization, and download as PNG or SVG vector format.

→ Generate

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Vertical Text Generator

Convert horizontal text to vertical display with support for right-to-left and left-to-right reading directions.

→ Generate

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JWT Decoder & Encoder

Decode, inspect, and encode JSON Web Tokens JWT. Visualize header, payload, and verify signature structure securely in browser.

→ Generate

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Colorful Text Effects Generator

Generate gradient text, rainbow text, and other colorful text effects with multiple color schemes.

→ Generate

Explore by Category

Browse 50+ developer tools organized by category

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Developer Tools

9 tools

Essential utilities for everyday coding: Base64 encoder, UUID generator, hash calculator, JWT decoder, cron parser, diff checker, SQL formatter, and more time-saving developer utilities.

Base64 Encoder & Decoder UUID Generator Hash Generator & Checksum URL Encoder & Decoder +5 more

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JSON Tools

33 tools

Format, validate, convert, and inspect JSON data with powerful tools. JSON formatter, validator, viewer, diff checker, and converters to CSV, YAML, XML, and beyond.

JSON Formatter & Validator CSV to JSON Converter YAML to JSON Converter XML to JSON Converter +29 more

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Markdown Tools

6 tools

Write, preview, and convert Markdown effortlessly. Live editor, HTML converter, table generator, table of contents builder, and a complete Markdown syntax cheat sheet.

Markdown Editor with Live Preview Markdown to HTML Converter HTML to Markdown Converter Markdown Table Generator +2 more

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Regex Tools

6 tools

Test, debug, and master regular expressions. Live Regex tester with match highlighting, email/phone/URL/IP validators, and an essential regex pattern cheat sheet.

Regex Tester & Debugger Regex Cheat Sheet & Reference Email Regex Validator & Pattern Phone Number Regex Validator +2 more

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Color Tools

5 tools

Perfect colors for every design project. HEX/RGB/HSL/CMYK converter, palette generator, CSS gradient maker, WCAG contrast checker, and Tailwind color picker.

Color Converter & Picker Color Palette Generator CSS Gradient Generator Color Contrast Checker WCAG +1 more

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CSS Generators

5 tools

Create stunning CSS effects without the guesswork. Box shadow, border radius, Flexbox, Grid, and glassmorphism generators with live preview and copy-ready code.

CSS Box Shadow Generator CSS Border Radius Generator CSS Flexbox Generator CSS Grid Generator +1 more

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Code Formatter

13 tools

Format, beautify, and minify code. 20+ programming languages including JS, CSS, Python, SQL, XML, and more.

SQL Formatter & Beautifier JavaScript Formatter & Minifier JavaScript Obfuscator CSS Formatter & Minifier +9 more

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Time & Date Tools

5 tools

Convert, calculate, and manage time zones and dates. Unix timestamp converter, timezone converter, date calculator, age calculator, and ISO week number finder.

Unix Timestamp Converter Timezone Converter Date Calculator Age Calculator +1 more

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Unit Converters

4 tools

Convert units and measurements instantly. Length, weight, temperature converters, and a handy BMI calculator for health and fitness tracking.

Length Distance Converter Weight Mass Converter Temperature Converter BMI Calculator

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QR Code Tools

7 tools

Generate professional QR codes for every use case. URL, WiFi, vCard, Email, WhatsApp, Payment QR codes and a universal QR generator with full customization.

QR Code Generator URL QR Code Generator WiFi QR Code Generator vCard Contact QR Code Generator +3 more

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SVG Tools

10 tools

Edit, optimize, convert, and preview SVG vector graphics. SVG compressor, editor, preview, color changer, PNG converter, optimizer, code copier, and React/Vue component generators.

SVG Compressor SVG Editor SVG Preview & Viewer SVG Color Changer +6 more

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Image Tools

17 tools

Compress, crop, convert, edit, and process images. 18+ image tools including compressor, resizer, cropper, format converter, Base64 encoder/decoder, watermark, EXIF viewer, color picker, favicon generator, and more.

Image Compressor Image Resizer Image Cropper Image Format Converter +13 more

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Crypto Tools

41 tools

Encryption, decryption, password generation, and hash calculation. 40+ algorithms including RSA, AES, DES, SM2/SM3/SM4, Bcrypt and more.

JS Encrypt/Decrypt Random Password Generator PostgreSQL Password Generator Bcrypt Password Verify +37 more

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Text Tools

34 tools

Process and transform various text content. Includes 30+ practical text tools: string concatenation, case conversion, Chinese pinyin, full/half width, traditional/simplified conversion, HTML processing, character statistics, deduplication, sorting, reverse, ID card validation, and more.

Text Case Converter String Concatenation Chinese to Pinyin Converter Full-width / Half-width Converter +30 more

Why Choose Developer Toolbox?

The all-in-one toolkit trusted by thousands of developers worldwide

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Lightning Fast

All 50+ tools run instantly in your browser. No servers, no uploads, no waiting. Every operation completes in milliseconds.

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100% Private

Zero data ever leaves your device. All processing happens locally using modern browser crypto APIs. Your code and credentials stay with you.

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50+ Tools

From JSON formatting to CSS generators to QR codes everything you need daily in one clean interface instead of dozens of bookmarks.

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Export Anywhere

Download results in all popular formats, copy to clipboard, or save files. Everything works even on mobile.

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Unlimited & Free

All tools are completely free with unlimited usage. No signups, no watermarks, no rate limits, ever.

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Responsive Design

Works perfectly on desktops, tablets, and phones. Full touch-friendly mobile-first UI for developers on the go.

How It Works

Find, use, done in 3 simple steps

Find Your Tool

Browse 9 categories or use search to find exactly what you need instantly.

Enter Your Input

Paste data, adjust settings, customize everything with our clean distraction-free interface.

Get Results

Copy output, download files, everything works instantly right in browser.

Frequently Asked Questions

Everything you need to know about Developer Toolbox

Are really all tools free? +

Yes! All 50+ tools are 100% completely free with unlimited usage. No subscriptions required. No watermarks, no ads interfering with your work.

Is my data safe? +

Absolutely. Everything happens in your own browser. We never send any data to an external server. Your data stays on your device, 100% private and secure with all processing done client-side only.

What browsers are supported? +

Works on all modern desktop and mobile browsers including Chrome, Firefox, Safari, Edge latest two versions.

Can I use these tools offline? +

Once you load our website in your browser, most tools work fully offline-capable after first load. No server-dependence for any core functionality.

How often are new tools added? +

We add new tools every single month. Follow our roadmap on the About page. For ideas please visit the Contact page to suggest your next feature.

Can I suggest a tool? +

Absolutely! Contact us anytime with feature requests or suggestions. We read every single message.

Start Building Today

Join thousands of developers saving hours every week with the all-in-one developer toolkit

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