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

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🔥 Most used this week

Loan & Interest Calculator (Compound)

Work out a monthly loan payment and a compound-interest maturity value in one place. Quick estimates for mortgages, personal loans and savings, right in your browser.

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.

Convert · Calc

Unit Converter

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

Pixels ↔ cm / mm Converter (DPI)

Convert pixels to centimetres, millimetres, inches and points at a chosen DPI, plus a table of common print specs such as passport photos and A4 in pixels.

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Loan & Interest Calculator (Compound)

Work out a monthly loan payment and a compound-interest maturity value in one place. Quick estimates for mortgages, personal loans and savings, right in your browser.

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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 (Discount, Ratio & Change)

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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Korean Age Calculator (International vs Korean Age)

Convert a birth date into international age, the old Korean counting age, and Korean "year age" side by side — plus your zodiac animal and days to your next birthday. Free, in your browser.

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Pyeong Calculator: Pyeong to m², Square Feet & Acres

Convert pyeong (the Korean area unit) to square meters, square feet and acres both ways, or get pyeong from width × height in meters, centimeters or feet. 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.

Ovulation & Period Calculator (Fertile Window)

Enter your last period and cycle length to see your next period, ovulation day and fertile window for the next 3 cycles, with a color-coded calendar. Free, private, in your browser.

Korean Lunar Calendar Converter (Solar ↔ Lunar)

Convert between solar and Korean lunar dates with leap months, weekday, zodiac animal and sexagenary year. Find lunar birthdays, Seollal and Chuseok dates. Free, 1900–2100.

Pregnancy Due Date Calculator (Weeks Pregnant)

Find your estimated due date from your last period or conception date (Naegele's rule), plus weeks pregnant, trimester, countdown and key milestone dates. Free in your browser.

Time Calculator (Add & Subtract Hours and Minutes)

Add and subtract hours and minutes to total your work or study time, find the duration between two times (overnight shifts included), and add hours to a clock time. Free, in your browser.

Korean Military Discharge Date Calculator

Pick an enlistment date and service branch to see the discharge date (전역일), days left, days served and a progress bar for Korean military service. Free, in your browser.

BMR Calculator (Basal Metabolic Rate & TDEE)

Calculate your BMR with the Mifflin-St Jeor equation, your daily maintenance calories (TDEE) and weight-loss or gain targets. Metric or lb/ft-in input, free in your browser.

Finance · Tax

Korea Salary Calculator: Take-Home Pay for Locals & Foreigners (2026)

Work out Korean take-home pay from a gross annual or monthly salary with 2026 social insurance and income tax — with options for foreign workers: the 19% flat tax, pension exemption and no unemployment insurance.

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Korea Severance Pay Calculator (2026, incl. Foreign Workers)

Estimate Korean statutory severance from your join and leave dates and recent 3-month pay, including bonus and annual-leave allowance — the same rules apply to foreign workers.

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Korea 4 Major Insurances Calculator — incl. Foreign Workers (2026)

Split Korea’s national pension, health, long-term care and employment insurance between employee and employer at 2026 rates, with options for foreign workers who are exempt from the pension or unemployment insurance.

Korea Minimum Wage & Hourly Pay Calculator (2026)

Turn an hourly wage and weekly hours into weekly and monthly pay with Korea’s weekly holiday allowance, and compare it with the 2026 minimum wage of 10,320 KRW an hour.

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Korea Unemployment Benefit Calculator (2026, incl. Foreign Workers)

Estimate Korea’s daily jobseeker benefit, benefit days and total from your average pay, age and insured period with 2026 limits — and check whether your visa is covered.

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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Korea Tax Refund Calculator for Tourists (VAT Refund)

Enter your shopping receipts to see which qualify for Korea’s tourist tax refund, where you can claim each one (instant at the store or at the airport) and roughly how much VAT you’ll get back.

Korea Income Tax Calculator — 19% Flat Tax for Foreigners (2026)

Get 2026 Korean progressive income tax (6–45%) and local tax from a tax base, or compare the 19% flat tax for foreigners with the regular rates on your salary.

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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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Loan Repayment Calculator (Amortization)

Compare equal-payment, equal-principal and interest-only loans, build a period-by-period amortization schedule, and copy the matching Excel PMT formulas or export CSV.

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Korea Mortgage Loan Limit Calculator: DSR & LTV (2026)

Estimate your Korean mortgage limit at the 40% DSR from income, rate and term, and compare it with the LTV cap — with notes for foreigners buying a home in Korea.

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Korea Real Estate Agent Fee Calculator: Jeonse, Wolse & Sale (2026)

Enter a sale price, jeonse deposit or deposit plus monthly rent to get the maximum Korean real estate agent fee (bokbi) by price band, with a quick guide to jeonse vs wolse for foreigners.

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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.

Korea Annual Leave Calculator: Days & Unused Leave Pay (2026)

Work out paid annual leave days under Korean labor law from your tenure, then the cash allowance for unused days from your ordinary wage — the same rules apply to foreign employees.

Savings & Deposit Interest Calculator (Korea, After Tax)

Enter a deposit or monthly savings amount, rate and term to see simple or monthly-compound interest and your payout after Korea’s 15.4% interest tax. Free, in your browser.

Korea Car Tax Calculator (Annual Vehicle Tax by cc)

Estimate Korea’s annual car tax (자동차세) for a private car from engine size and registration year, with education tax, June/December bills and the January prepayment discount.

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.

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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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Special Characters & Symbols (Click to Copy)

Copy and paste special characters — stars, hearts, arrows, check marks, math, units, currency, circled numbers and more. One click copies; collect several and copy them at once. Free, in your browser.

Useful Guides & Tips

Pregnancy Weeks to Months: Conversion Chart and Why 40 Weeks Is Called 10 Months
2026-10-28•27 min read

Pregnancy Weeks to Months: Conversion Chart and Why 40 Weeks Is Called 10 Months

Convert pregnancy weeks to months two ways, 4-week months and calendar months, side by side. See how many months your N weeks M days is, why charts disagree, and how to count back from your due date.

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Korean Lunar Leap Month Years (2017–2034): Table, Cycle, and How Birthdays and Memorial Rites Are Kept
2026-10-26•29 min read

Korean Lunar Leap Month Years (2017–2034): Table, Cycle, and How Birthdays and Memorial Rites Are Kept

Which years have a leap month (yundal) in the Korean lunar calendar? See every leap month from 2017 to 2034 with solar dates, the 19-year cycle, and how leap-month birthdays and memorial days are observed.

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Special Character Shortcuts: Type ※ ★ ° © on Windows, Mac, Word and Excel (Even Without a Hanja Key)
2026-10-25•31 min read

Special Character Shortcuts: Type ※ ★ ° © on Windows, Mac, Word and Excel (Even Without a Hanja Key)

Special character keyboard shortcuts for Windows (Win+., Alt codes, Korean IME), Mac (Ctrl+Cmd+Space, Option keys), Word, Excel and PowerPoint in one comparison table, plus fixes when shortcuts fail and a click-to-copy symbol tool.

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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.