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All tools in one place.

Image, PDF, Dev, Design, and Calc tools. Organized by category, ready to use.

48Tools

8Categories

100%Free

🔥 Most used this week

Loan & Interest Calculator (Compound)

Loan repayment and compound interest in one place. Compare equal-payment vs equal-principal schedules and savings—inputs stay on your device.

Character Counter

Count characters, words, lines, and UTF-8 bytes as you type. Hit SNS and SMS limits before you post—text stays in the browser.

Image Compressor & Converter

Reduce image and photo file size in your browser, and convert between PNG, JPG, and WebP. No upload—shrink files for email and web with minimal quality loss.

Image

Image Compressor & Converter

Reduce image and photo file size in your browser, and convert between PNG, JPG, and WebP. No upload—shrink files for email and web with minimal quality loss.

Image Resizer & Cropper · Social Media

Freely crop and resize images, or fit Instagram, YouTube, and blog specs. Preset ratios avoid awkward crops—processed locally in your browser.

Docs · PDF

Combine & Merge PDF · Split

Merge PDFs in order or split pages locally in your browser. Files never leave your device—free, no install, for contracts and reports.

PDF to JPG Converter · Image ↔ PDF

Extract PDF pages to JPG/PNG or bundle images into a PDF. Set DPI for sharp output—files processed locally, never uploaded.

Compress PDF

Shrink PDF size in your browser. Pick a compression level to lighten scanned or image-heavy PDFs — no upload, free.

🔥 Hot

Developer

JSON Formatter & Converter

Format, validate, and convert JSON to CSV or YAML in one view. Debug APIs and config files locally—free, nothing sent to a server.

Base64 Encoder & Decoder

Encode and decode text or images to Base64 for Data URLs and API tests. RFC-style conversion in your browser—private and free.

Diff Checker / Text Compare

Compare two texts or code snippets line by line or by character. Spot contract and config changes—paste stays local, no upload.

Regex Tester & Cheat Sheet

Test regex patterns live with flags and a cheat sheet. Parse emails, URLs, and logs—pattern and sample text never leave the browser.

URL Encoder & Decoder

Encode or decode URLs with encodeURIComponent for UTF-8 and special chars. Fix broken query strings—processed locally, free.

Design

Color Palette Generator

Build harmonious palettes and copy HEX, RGB, and HSL. Check WCAG contrast and export CSS or Tailwind tokens—all in your browser.

SVG Image Converter

Export SVG vectors to PNG or JPG at any scale. Keep transparency or set a background—local conversion, no server upload.

CSS Box-Shadow Generator

Dial blur, spread, offset, and color to build box-shadow CSS with live preview. Copy inset shadows—free, no install required.

CSS Gradient Generator

Preview linear and radial gradients and copy background CSS. Set angle and color stops for cards and buttons—in your browser.

CSS clamp() Calculator

Generate responsive clamp(min, preferred, max) for font-size and spacing. Fluid sizing without extra media queries—copy one line.

Convert · Calc

Unit Converter

Convert length, weight, temperature, area, and data units instantly. Metric vs imperial for travel, cooking, and dev—free in-browser.

Loan & Interest Calculator (Compound)

Loan repayment and compound interest in one place. Compare equal-payment vs equal-principal schedules and savings—inputs stay on your device.

🔥 Hot

Currency Exchange Rate Calculator

Convert dollars, won, yen, euro and more at live rates. European Central Bank reference rates, updated daily. Free, in your browser.

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Percent Calculator

Calculate discounts, ratios, and percent change instantly. Reverse sale price and savings—no spreadsheet, free in your browser.

Date & D-Day Calculator

Count days to a target date (D-day), find the difference between two dates, or add and subtract days. Free, in your browser.

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Age Calculator

Enter a birth date to get your exact age, plus your zodiac sign and the days until your next birthday. Free, in your browser.

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Pyeong Calculator (Pyeong ↔ m²)

Convert between pyeong (the Korean area unit) and square meters both ways, or get pyeong from width × height. Free, in your browser.

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BMI Calculator

Calculate your BMI from height and weight and see whether you're underweight, normal, overweight, or obese—plus your healthy weight range. Free, in your browser.

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GPA Calculator

Enter each course's credits and grade to get your weighted GPA, with 4.5 / 4.3 / 4.0 scales and a 100-point estimate. Free, in your browser.

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Timer & Stopwatch

A countdown timer with a beep and a lap stopwatch, together in one screen. No install — free, in your browser.

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World Clock & Time Zone Converter

See the current time in major cities at a glance and convert any time between time zones. Daylight saving handled automatically. Free, in your browser.

Finance · Tax

Korean Salary Take-Home Calculator (2026)

Calculate Korean take-home pay from gross annual or monthly salary with 2026 social insurance and income tax. Includes the national pension rate rise, dependents, and non-taxable pay.

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Korean Severance Pay Calculator (2026)

Estimate statutory severance from join/leave dates and recent 3-month pay, including bonus and annual-leave allowance.

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Korean 4 Social Insurances Calculator (2026)

Split Korea's national pension, health, long-term care, and employment insurance between employee and employer at 2026 rates. Enter a monthly salary for an instant breakdown.

Korean Hourly Wage & Holiday Pay Calculator (2026)

Turn an hourly wage and weekly hours into weekly and monthly pay including Korea's weekly holiday allowance. Compares with the 2026 minimum wage.

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Korean Unemployment Benefit Calculator (2026)

Estimate daily jobseeker benefit, benefit days, and total from your average pay, age, and insured period, with 2026 upper and lower limits.

Korean VAT Calculator (add & extract 10%)

Add 10% VAT to a net amount, or split a gross total into net and VAT. Based on standard Korean VAT.

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Korean Income Tax Calculator (2026 rates)

Enter a tax base to get 2026 progressive income tax (6–45%), local tax, and the effective rate.

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Korean Gift Tax Calculator (2026)

Estimate gift tax from the gift value and relationship, applying the 10-year deduction, rates, and a 3% filing credit.

Korean Property Tax Calculator (2026 housing)

Enter the published price to estimate housing property tax and local education tax using the 2026 fair-value ratio and rates. Supports the 1-home special.

Korean Acquisition Tax Calculator (2026 housing)

Enter purchase price and area to estimate housing acquisition tax by price band, plus local education and rural special taxes.

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Korean Capital Gains Tax Calculator (2026, simplified)

Estimate capital gains tax from the gain, holding period, and asset type with the basic deduction and rate. Exemptions and surcharges excluded.

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Korean DSR & Loan Limit Calculator (2026)

Estimate your loan limit at the 40% DSR from income, rate, and term, and compare it with the LTV cap. Includes a stress-DSR note.

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Korea Real-Estate Brokerage Fee Calculator (2026)

Enter a sale or lease amount to get the brokerage fee (bokbi) by price-band upper-limit rate. Supports monthly-rent conversion.

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Korean Loan Prepayment Fee Calculator (2026)

Enter prepaid principal, fee rate, and elapsed time to get the prepayment fee, prorated by the remaining fee period.

Korean Annual Leave & Allowance Calculator (2026)

Get annual leave days from tenure, then the leave allowance from monthly ordinary wage and unused days.

Generate

QR Code Generator

Create QR codes for URLs, text, contacts, and Wi-Fi; download PNG or SVG. Tips for scan-friendly design—generated locally, free.

Password Generator & Strength Checker

Generate strong passwords and score strength in real time. Length and charset options—credentials created only in your browser.

Lotto Number Generator & Random Picker

Generate Korean Lotto 6/45 numbers as colored balls, and draw random winners from your own list — all in your browser, free.

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Ghost Leg (Ladder Game)

Enter players and outcomes to draw a random ladder and trace each path. Fair for bets, ordering, or team picks — free, in your browser.

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Text

Character Counter

Count characters, words, lines, and UTF-8 bytes as you type. Hit SNS and SMS limits before you post—text stays in the browser.

🔥 Hot

Case Converter

Convert to UPPER, lower, Title, camelCase, snake_case, and kebab-case. Rename variables and files—processed only in your browser.

Korean Name Romanizer

Convert a Korean name into passport-style Roman letters, with common surname spellings and the official Revised Romanization. Free, in your browser.

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Useful Guides & Tips

2026-07-20•23 min read

Mortgage Loan Limit Calculator: How LTV and DSR Decide What You Can Borrow

Learn how South Korean mortgage loan limits are set by LTV, DSR, and the stress DSR add-on rate, with income and home-price comparison tables and current 2026 regulated-area rules.

2026-07-19•27 min read

Salary Four Major Insurance Calculator: How Much Is Deducted in Korea (2026 Rates)

Calculate how much national pension, health insurance, long-term care insurance, and employment insurance take from a Korean salary, using confirmed 2026 rates and example tables.

2026-07-18•25 min read

Real Estate Capital Gains Tax Calculator: Korea Tax Rates, Exemptions & Surtax (2026)

A 2026 walkthrough of Korea's real estate capital gains tax rates, long-term holding deductions, the 1.2 billion KRW one-home exemption, and the return of the multi-home surtax.

ToolHub — Secure and Fast Browser-Based Web Tools Portal

ToolHub is a collection of free web tools you can use right in your browser — no install required. From file conversion and image compression to developer utilities and everyday calculators, the tasks you reach for most live in one place.

Your data never leaves your device

Most tools run directly inside your browser. Images, PDFs, and text aren't uploaded to a server, so you can handle sensitive documents and personal photos with confidence.

What you'll find here

Developer tools: JSON formatter, regex tester, Base64, text diff
Images & documents: image compression, SVG conversion, PDF merge & convert, social image resizing
Everyday & work: unit converter, finance calculator, QR code generator, color palette, password generator

Each tool page includes real examples and pitfalls to watch for, and the blog goes deeper with practical how-to guides.