Init Toolbox

An online toolkit built with JavaScript – lightweight, practical, and runs entirely in your browser. No installation required.

Icon Init AI Prompt Optimizer

Init AI Prompt Optimizer 2.0

Init AI Prompt Optimizer is a browser-based tool for rewriting AI prompts with multiple tones like polite, concise, creative, and instructive. Fast, private, and fully client-side.

Icon Init Clipboard Image

Init Clipboard Image 1.0

Init Clipboard Image is an online tool that lets you paste images directly from your clipboard (Ctrl + V), preview them instantly in the browser, and download the image with a single click. Everything runs 100% on the client side — no uploads, fast, simple, and secure.

Icon Init Color Palette

Init Color Palette 1.0

Init Color Palette is an online tool that extracts dominant colors from any image. Supports HEX, RGB, and HSL formats, sortable by dominance, hue, or brightness. Copy color codes, download palette images, and use advanced color filtering. Fully client-side and privacy-friendly.

Icon Init Diff Explainer

Init Diff Explainer 2.0

Compare two texts and get natural-language explanations for every change. Fully private, runs 100% in your browser — no server, no tracking.

Icon Init Document Formatter

Init Document Formatter 2.0

Clean and format HTML text with proper spacing, punctuation, and capitalization. Preserve structure, support dark mode, no installation needed.

Icon Init Image Grid Shuffler

Init Image Grid Shuffler 2.1

Split an image into multiple tiles by rows/columns, shuffle the order, and export the result with a built-in answer key to reconstruct the original. Fully client-side, fast PNG export, no upload needed.

Icon Init JSON Tester & Cleaner

Init JSON Tester & Cleaner 1.0

Init JSON Tester & Cleaner is an online tool for validating, formatting, and cleaning JSON data. Runs entirely in the browser, with no server required.

Icon Init Keyword Extractor

Init Keyword Extractor 2.0

Extract keyword phrases from titles with custom length and stop word filters. Supports Vietnamese & English. Fast and fully browser-based.

Icon Init Markdown Converter

Init Markdown Converter 1.1

Convert HTML to clean Markdown instantly and privately. Fast, accurate, and fully client-side — no server, no installation needed.

Icon Init Meta Image Cropper

Init Meta Image Cropper 1.0

Crop images to standard SEO sizes like Facebook, Twitter, Pinterest… Init Meta Image Cropper supports both auto and manual cropping, processed entirely in the browser.

Icon Init Meta Inspector

Init Meta Inspector 2.0

Init Meta Inspector lets you preview how your SEO title, description, and image will appear on Google, Facebook, and X. Instant feedback. No login. 100% browser-based.

Icon Init Password Generator

Init Password Generator 1.4

Init Password Generator helps you generate strong, customizable passwords and instantly produce PHP password_hash. Real-time strength meter, flexible presets, secure on-browser processing, and one-click copy for both password and hash.

Icon Init Photo Mark

Init Photo Mark 1.0

Add Watermark to images directly in your browser. Adjust position, color, opacity, size, and apply repeat patterns — then download a high-quality PNG. 100% client-side, secure, and fast.

Icon Init QR Code Generator

Init QR Code Generator 2.0

Generate QR codes directly in your browser: enter your content, adjust size, colors, error correction level, and download a crisp PNG image. Init QR Code Generator is fully client-side — fast, private, and secure.

Icon Init Quote Studio

Init Quote Studio 2.2

Create beautiful quote images with Facebook, Classic, and Poster styles. Init Quote Studio supports avatar, rounded box, background effects, and aspect ratio options. 100% browser-based, no backend.

Icon Init Ratio & Size

Init Ratio & Size 1.0

Calculate dimensions by aspect ratio directly in your browser: lock width or height and automatically compute the remaining side using 16:9, 4:3, 1:1, A4, A3 and more. Init Ratio & Size runs 100% client-side – fast, accurate and private.

Icon Init Regex Tester

Init Regex Tester 2.0

Test regular expressions (RegExp) instantly, interactively, and privately. All runs in the browser — no server, no installation.

Icon Init TOC Generator

Init TOC Generator 3.0

Generate a Table of Contents from h1–h6 tags in seconds. Export as HTML, Markdown, or plain text. Fast, SEO-friendly, and browser-based.

Press Ctrl + \ or swipe left on mobile to quickly open the toolbox.

Development Philosophy

Not just tools – but clear, minimal, and purposeful experiences.

Runs Anywhere

No installation needed. Works directly in your browser – on desktop or mobile.

Optimized Performance

Built with Vanilla JavaScript – no heavy frameworks. Instant load, instant result.

Minimal UI

Focused on doing one job well. No clutter, no distractions – just the tool you need.

Free & Unrestricted

No account required, no data tracking, no ads. Just open and use, instantly.

🎯 Goal: A compact toolbox for bloggers, developers, and anyone who needs quick web-based helpers.

Who is Init Toolbox for?

You want to use online tools with zero setup.
You’re a developer who needs lightweight helpers for daily tasks.
You prefer speed and efficiency over bloated interfaces.
You love tools that “just work” when you open them.

Ready to explore Init Toolbox?

A set of lightweight, fast, browser-based tools – open tab, get things done.

Browse all tools

Init Toolbox

Press Ctrl + \ on desktop, or swipe left anywhere on mobile.