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HS Tools

Free Online Utility Tools
무료 온라인 도구 모음

Browser-based tools for color conversion, developer utilities, text processing, CSS generation, file conversion, and more. No login, no installation — completely free.
색상 변환, 개발자 도구, 파일 변환 등 로그인 없이 무료로 사용하는 온라인 도구 모음

Tool Categories

50+

Features

Languages

100%

Free Forever

All Tools

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Color Tools

색상 변환 & 디자인 도구

Complete color toolkit for designers and developers. Convert, generate, and analyze colors instantly in your browser.

HEX ↔ RGB ↔ HSL converter
Palette generator from any image
Gradient maker with CSS export
Contrast checker (WCAG)
Color mixer & named colors

HEX/RGB 팔레트 그라디언트 색상 대비

Essential utilities for every developer. Format, generate, encode, and test — all in one place with no server calls.

JSON formatter & validator
UUID / ULID generator
Hash generator (MD5, SHA256)
Base64 encode & decode
Regex tester & password generator

JSON UUID Base64 Regex

All the text utilities you need for writing, coding, or content creation. Fast, offline, and privacy-friendly.

Character & word counter
Case converter (upper, lower, title)
Lorem Ipsum generator
Duplicate line remover
Slug & URL-safe text generator

글자수 대소문자 Lorem Ipsum 텍스트 정리

Convert, compress, and transform files without uploading to external servers. Supports images, PDFs, spreadsheets, and archives.

Image convert, resize & compress
PDF merge, split & compress
CSV ↔ JSON ↔ XLSX conversion
ZIP create & extract
Image to PDF, crop & remove bg

Generate clean, ready-to-copy CSS code visually. From layout builders to button generators — speed up your front-end workflow.

Flexbox & Grid layout builder
Box shadow & border-radius editor
Button generator with hover effects
Gradient & animation builder
CSS variable manager

레이아웃 Box Shadow Flexbox 버튼

Wake up feeling refreshed by aligning your alarm to your natural 90-minute sleep cycles. Science-backed and simple to use.

90-minute sleep cycle calculator
Best wake-up time finder
Bedtime calculator
Sleep debt tracker
Personalized sleep tips

수면 사이클 기상 시간 90분 주기

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How It Works

Choose a Tool

Pick any tool from the list above. Each category contains multiple utilities for common tasks.

Use It Instantly

No sign-up, no download. Open the tool and start working right away in your browser.

Copy Your Result

Get your output instantly and copy it to use in your project. Your data never leaves your device.

About HS Tools

HS Tools is a free collection of browser-based utilities designed for developers, designers, and everyday users. Every tool works entirely in your browser — your data is never sent to a server, and no account is required.

HS Tools는 개발자, 디자이너, 그리고 모든 사람들이 일상 업무에서 자주 사용하는 작업을 빠르고 쉽게 처리할 수 있도록 만들어진 무료 온라인 도구 모음입니다. 모든 도구는 브라우저 안에서 완전히 동작하며, 입력한 내용은 서버로 전송되지 않습니다.

🔒 Privacy First

All processing happens in your browser. Input data is never transmitted to our servers.

⚡ Instant Results

No server round-trips. Results appear immediately as you type or upload.

🆓 Always Free

Every tool is permanently free. No hidden fees, no subscription, no trial limits.

🌍 Multilingual

Supports English, Korean (한국어), Japanese (日本語), and Chinese (中文).

📱 Mobile Friendly

All tools are fully responsive and work on smartphones and tablets.

🔄 Always Updated

New tools and features are added regularly based on user feedback.

Frequently Asked Questions

Are all tools completely free? / 정말 무료인가요?

Yes, every tool on HS Tools is 100% free with no hidden costs, subscriptions, or trial limits. 네, 모든 도구는 완전히 무료입니다. 회원가입이나 결제가 필요 없습니다.

Do I need to create an account? / 회원가입이 필요한가요?

No account required. Simply visit any tool and start using it immediately. No email, no password, no sign-up. 회원가입 없이 바로 사용할 수 있습니다.

Where does my data go? / 입력한 데이터는 어디로 가나요?

Your data stays in your browser. All processing is done client-side using JavaScript, so nothing is sent to or stored on our servers. 입력한 내용은 서버로 전송되지 않습니다. 모든 처리는 사용자의 브라우저 안에서만 이루어집니다.

Do the tools work on mobile? / 모바일에서도 사용할 수 있나요?

Yes, all tools are fully responsive and optimized for mobile browsers. They work on smartphones and tablets without any issues. 네, 모든 도구는 모바일 환경에 최적화되어 있습니다.

What tools are available? / 어떤 도구가 있나요?

Currently: Color Tools (HEX/RGB/HSL conversion, palettes, gradients), Developer Tools (JSON, UUID, Base64, Hash), Text Tools (word count, case conversion, Lorem Ipsum), File Converter (images, PDF, CSV, ZIP), CSS Tools (layout builder, button generator), and Sleep Coach (sleep cycle calculator). More tools are added regularly.

Can I request a new tool? / 새로운 도구를 요청할 수 있나요?

Absolutely! Send your request to rlawhdrl3702@gmail.com and we'll consider adding it. 이메일로 원하는 도구를 알려주시면 검토 후 추가하겠습니다.

What languages are supported? / 어떤 언어를 지원하나요?

Most tools support English, Korean (한국어), Japanese (日本語), and Simplified Chinese (中文). The language is automatically detected based on your browser settings.