Simple Online Tools for Everyday Work

Remove duplicate lines from any text instantly. Case-insensitive matching, whitespace trimming, keep first or last occurrence. Live side-by-side diff with download.

ContentRemove Duplicates →

Email Address Validator

Verify if an email address is valid and properly formatted.

SecurityValidate Email →

Favicon Generator

Create custom favicons from your image with real-time preview and export.

DesignGenerate Favicon →

Find & Replace

Find and replace text in large blocks with regex support and real-time preview.

ContentFind & Replace →

GitHub Repo Analyzer

Inspect any public GitHub repository — languages, contributors, commit activity, and health metrics.

DeveloperAnalyze GitHub Repository →

HTML to Markdown Converter

Convert HTML content into Markdown syntax.

Data ConversionConvert HTML to Markdown →

HTTP Header Analyzer

Inspect and analyze HTTP headers of any website.

WebsiteAnalyze Headers →

Image Compressor

Compress JPEG, PNG, and WebP images online without losing quality.

AI & ProductivityCompress Image →

Image Converter

New

Convert images between JPEG, PNG, WebP, BMP, and GIF formats instantly. Free, browser-based — no upload to server.

AI & ProductivityConvert Image →

Image Cropper

New

Crop images with drag handles, fixed aspect ratios, or social media presets. Export as JPEG, PNG, or WebP — free, browser-based.

AI & ProductivityCrop Image →

Image Resizer

New

Resize images by dimensions, percentage, or target file size. Export as JPEG, PNG, or WebP — free, browser-based.

AI & ProductivityResize Image →

Image to Base64 Encoder

Convert images into Base64 format for easy embedding.

UtilityConvert Image to Base64 →

Invoice Generator & PDF Creator

Easily create, preview, and download invoices in PDF format.

Finance & BusinessCreate Invoice →

IP Address Lookup

Find your public IP address and geolocation details — country, city, ISP, and timezone.

NetworkingLookup IP Address →

JavaScript Obfuscator

Protect your JavaScript code by making it difficult to read or reverse-engineer.

DeveloperObfuscate JavaScript →

JSON Diff Checker

Compare two JSON objects and visualize differences in real time.

DeveloperCompare JSON →

JSON Formatter & Validator

Format, beautify, and validate JSON data online — free JSON linter.

DeveloperFormat & Validate JSON →

JSON to CSV Converter

Convert JSON data into CSV for easy spreadsheet analysis.

Data ConversionConvert JSON to CSV →

JWT Decoder

Decode and inspect JSON Web Tokens — view header, payload, and claims instantly.

SecurityDecode JWT →

Markdown Editor

Write and preview Markdown with real-time rendering for documentation and content.

ContentOpen Markdown Editor →

Markdown to HTML Converter

Transform Markdown text into clean HTML format.

Data ConversionConvert Markdown to HTML →

Mock Data Generator

New

Generate realistic mock data for testing and development. Build a custom schema, set row count, and export as JSON, CSV, or SQL.

DeveloperMock Data Generator →

OG Previewer

Preview and generate Open Graph meta tags with live previews.

DeveloperPreview OG Tags →

Profit Margin Calculator

Calculate your profit margin based on cost and revenue.

Finance & BusinessCalculate Profit Margin →

QR Code Generator

Generate custom QR codes for links, text, or other data.

UtilityGenerate QR Code →

Radius Generator

Generate custom CSS border-radius values visually.

DesignGenerate Border Radius →

Secret Key Generator

Generate secure random keys, API tokens, or passwords.

SecurityGenerate Secret Key →

Sitemap Generator

Generate XML sitemaps instantly to improve SEO.

DeveloperGenerate Sitemap →

Solar System Calculator

New

Size a solar system accurately. Calculate inverter, battery, and panel requirements from your appliance list.

CalculatorSolar System Calculator →

SSL Checker

Analyze and verify SSL certificates for any domain.

SecurityCheck SSL Certificate →

State Machine Visualizer

Visualize and interact with finite state machines using JSON configuration.

DeveloperVisualize State Machine →

Technology Detector

Identify frameworks and technologies used by any website.

DeveloperDetect Technologies →

Text Cleaner

Clean and format text with one click using customizable rules.

ContentClean Text →

Text Diff Checker

Compare two texts side-by-side and spot every difference.

ContentCompare Texts →

Text to Binary Converter

Convert text into binary code representation.

Data ConversionConvert Text to Binary →

Timestamp Converter

New

Convert Unix timestamps to human-readable dates and back. Supports seconds, milliseconds, ISO 8601, UTC strings, and relative expressions. Full timezone support.

Date & TimeConvert Timestamp →

Website Latency Tester

Measure website response time and network latency.

WebsiteTest Website Latency →

Website Status Checker

Check if your website is online and diagnose potential issues.

WebsiteCheck Website Status →

WHOIS Domain Lookup

Look up WHOIS data for any domain — registrar, expiry date, and nameservers.

DomainCheck Domain Info →

Word Counter

Count words, characters, sentences, paragraphs, and reading time in seconds.

ContentCount Words →

Word Separator

New

Join words with hyphens, underscores, dots, or a custom separator. Apply case formatting including camelCase and PascalCase.

ContentWord Separator →

YouTube Thumbnail Downloader

Download high-resolution YouTube video thumbnails.

MediaDownload YouTube Thumbnail →

Articles

Insights & Tutorials

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Jun 27, 20267 MIN READ min readℵi✗✗

APK Won't Install on Android? 12 Common Reasons and How to Fix Them

APK installation errors on Android usually come down to one of a handful of compatibility or configuration issues. This guide covers all twelve.

May 8, 20264 MIN READ min readℵi✗✗

How to Build a Telegram Bot with Node.js (Beginner Tutorial)

Telegram bots are automated accounts controlled by code. This guide walks you through creating a working bot from scratch using Node.js, from registering with BotFather to running and hosting your bot.

Apr 28, 20263 MIN READ min readℵi✗✗

How to Use Claude Code with Free AI Models

Claude Code normally requires a paid plan, but you can configure it to use free models instead, mainly for testing and experimenting before subscribing. Here's how.

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About

Why NIXX/DEV?

NIXX/DEV is your shortcut to productivity. Stop googling for basic tools like word counters or image compressors. Everything you need is right here — clean, reliable, and ready in one click.

These tools are engineered to save time and reduce friction. Whether you're writing, coding, or planning your next project, our tools work instantly without unnecessary complexity or distractions.

Built with care for developers and creators. We're constantly expanding our collection and refining existing tools based on real user feedback.

50+

Tools available

100%

Free to use

14K+

Users / month

Lightning Fast

Tools load instantly — no waiting, no delays.

Developer Focused

Built by developers, for developers and creators.

Community Driven

Tools evolve based on real user feedback.

Always Improving

New tools and updates shipped regularly.

Join thousands of developers and creators who rely on NIXX/DEV every day.