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Developer Suite

Developer Tools

Free, secure, offline utilities for developers. Format JSON, generate mock data, encode URLs, repeat text, compute hashes and manage secrets natively in your browser.

AI & Tokens

AI Token Counter & Cost Calculator

Count BPE tokens and compare API inference pricing for GPT-4o, Claude 3.5, DeepSeek R1, and Gemini.

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Math Solver

Base Converter

Convert numbers between Binary, Decimal, Hex, and custom bases.

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Dev Utility

String Multiplier

Repeat text multiple times instantly with custom separators.

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Crypto Hash

Hash Generator

Securely generate cryptographic hashes completely offline.

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Random Gen

Password Generator

Generate cryptographically secure passwords locally in your browser.

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Security

Password Strength Checker

Test password entropy, complexity, and time to crack locally in your browser.

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URL & Query Parser

URL Encoder / Decoder

Parse and build URLs dynamically, edit query parameters, and percent-encode text offline.

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JSON Suite

JSON Formatter & Inspector

Validate, minify, beautify and search JSON structures offline.

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Developer Tool

Dummy Data Generator

Generate customizable mock datasets in JSON, CSV, SQL, or XML format instantly.

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Content Tool

Markdown Editor

Write rich Markdown text with side-by-side live compiling, toolbar, and HTML/MD export.

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Time Utility

Unix Epoch Converter

Convert Unix timestamps to human-readable dates and vice-versa. Supports seconds, milliseconds, microseconds, and nanoseconds.

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PII Scrubbing

Data Sanitizer

Scrub PII, system secrets, and trackable unicode layout marks from your data locally.

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Image Code

Base64 Image Encoder

Encode images to Base64 data URLs or decode Base64 strings back to images locally.

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Dev Utility

Code Formatter & Minifier

Format and minify CSS, JavaScript, and HTML code instantly in your browser.

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Content Tool

Diff Checker

Compare text contents or scripts side-by-side or unified with character highlights offline.

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What Is My IP Address?

Find your public IP, geolocation, ISP, ASN, timezone, and run WebRTC leak + DNS resolver tests. 100% client-side.

Network Tool
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SQL Builder

SQLite DB Generator

Design database tables visually, generate mock relational datasets, and download SQLite files.

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Dev Utility

Regex Tester

Test regular expressions live with match highlighting, capture groups, and preset patterns.

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Data Converter

JSON to CSV

Convert JSON arrays to clean CSV files instantly with automatic nested object flattening.

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Data Converter

CSV to JSON

Parse CSV data with quoted-field handling and convert to structured JSON with pretty-print toggle.

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Mobile Tool

APK Mobile Sideloader

Install Android APKs from your browser to your phone via USB using WebUSB no ADB command line needed.

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WASM Compiler

C++ Compiler

Compile and run C++ code in browser using WebAssembly GCC engine.

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WASM Compiler

C# Compiler

Run C# .NET code online with instant output preview.

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WASM Compiler

Python Compiler

Execute Python scripts locally using Pyodide WebAssembly.

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WASM Simulator

Verilog HDL Simulator

Simulate Verilog digital circuits online with wave display.

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WASM Compiler

SQL Compiler

Execute SQLite queries and relational database scripts in-browser.

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JS Sandbox

JavaScript Sandbox

Run JavaScript code with live console output logging.

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Web Playground

HTML / CSS / JS Playground

Live HTML, CSS, and JS web preview editor.

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Compiler Hub

Code Compiler Suite

All-in-one multi-language browser compiler hub.

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Dev Tool

Data URI & SVG Encoder

Encode images and SVG code to Data URIs.

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DMARC Parser

DMARC Analyzer

Parse and analyze DMARC XML reports locally for email security.

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Appx Utility

Appx Package Inspector

Inspect Appx, Appxbundle, Msix, Msixbundle package contents offline.

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Social SEO

Open Graph & Meta Tag Generator

Generate og:title, og:image, Twitter Cards, and Schema.org JSON-LD. Live platform previews for Google, Twitter, Facebook, LinkedIn, Discord.

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Networking

IP Subnet Calculator & CIDR Visualizer

Interactive binary bitmask visualizer, subnet split/divider, usable host range, broadcast address, and wildcard mask. 100% client-side.

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Popular Developer Utilities & Guides

Instant browser-based solutions for coding, encoding, formatting, and debugging without server uploads.

Base64 Encode and Decode Compare Two Texts Cron Expression Generator & Explainer Format JSON Bcrypt Hash Generator Online — Secure Password Hashing Generate MD5 Hash Generate SHA-256 Hash JWT Decoder Markdown Editor Minify JSON Run C++ Run JavaScript Run Python Code SQL Formatter & Beautifier Test Regular Expressions URL Encode and Decode UUID / GUID Generator Validate JSON Convert YAML to JSON

Why browser-native developer tools matter

When you paste an API key into an online hash tool that sends requests to a server, you have no way to verify that key isn't logged. The same risk applies to passwords, private tokens, database connection strings, or any sensitive text. NexaTools eliminates this concern by running every computation locally your input data never touches a network socket after the page loads.

Web Crypto API

SHA-256, SHA-512, and other cryptographic operations use the browser's built-in crypto.subtle audited, hardware-accelerated, and isolated from JavaScript.

SQLite via WebAssembly

sql.js compiles the actual SQLite3 source to Wasm, giving you a real relational database with no installation, no daemon, and no network dependency.

Zero data retention

No inputs are logged, stored, or transmitted. Every tool is a stateless browser function refresh the page and all data is gone.

Frequently Asked Questions

What developer utilities are available in the NexaTools Developer category? ▼
The hub provides a comprehensive suite of offline utilities including JSON formatters, text diff checkers, hash generators, Unix epoch converters, Markdown editors, dummy data creators, meta tag generators, and more.
Do any tools in the developer suite require an account or registration? ▼
No. All developer tools are completely free to use without signing up, providing an API key, or creating an account.
How do NexaTools developer utilities handle data privacy and security? ▼
Every tool runs client-side inside your web browser using HTML5, WebAssembly, and modern JavaScript APIs. Your code, tokens, database queries, and data payloads are never sent to external servers.
Can I use these developer tools offline without an active internet connection? ▼
Yes. Once loaded or cached via the progressive web app service worker, the client-side logic operates without requiring network requests.
How can I quickly find a specific developer tool in the hub? ▼
The developer tools directory organizes utilities into clear cards with descriptive summaries and direct links, enabling quick navigation to the exact utility you need.