Money tools default to US dollars (USD). Links marked Korean open a Korean page.

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Free Online Tools - Calculators, Converters and Images

Quickly find the tool you need by name, topic, or keyword.

Finance calculators

Investing and loans: explore the numbers in 1 minute

ETF return comparison calculatorCompare the long-term performance of two ETFs Free ETF recurring investment calculatorEstimate returns from regular investments Free Loan interest calculatorCompare interest by repayment method Free DSR calculatorEstimated repayment burden relative to income Free Hourly wage calculator2026 minimum hourly wage, monthly salary, and annual salary to hourly wage conversion Free FIRE calculatorEstimate when you could reach your goal based on your savings rate and assumed returns Free

Life calculators

Everyday calculations and conversions for area, travel, energy efficiency and more

Korean area converter (pyeong)m²↔pyeong, a Korean area unit · 84 m² apartment example Free Make a 2027 calendar PDFA4 calendar PDF and PNG · events · 2026~2037 · no holidays by default Free Make diary and planner inserts6-hole A5·A6 monthly and weekly inserts, A4 print PDF Free Worldwide public holidays & travel exchange ratesCheck holidays and travel exchange rates by country Free Monitor size comparison24·27·32-inch actual cm·PPI comparison table Free EV km/kWh ↔ fuel economy conversionCompare km/kWh·km/L and monthly running costs Free Dog and cat age calculatorDog 3 years = 28 years (small breed) · cat 5 years = 36 years, human age conversion Free Pet QR code generatorCreate a contact QR code for a lost pet Free

Developer tools

Handy tools for JSON, encoding, colors, and more

HTML live editorCode writing and preview Free Markdown to HTML conversionReal-time Markdown to HTML conversion Free JSON formatter & viewerFormat, minify, and check syntax errors Free Base64 encoding/decodingUTF-8 text conversion Free Number base converterConvert number bases with prefixes, bits, and worked steps Free HTML color code chart & color pickerColor code chart · HEX↔RGB↔HSL conversion · contrast Free AI API cost calculatorCompare token cost by model Free Password strength checkerEntropy, pattern, and 4-type crack time analysis Free

Text and utilities

Frequently used tools for character count, whitespace cleanup, units, QR, and more

All-purpose unit converterLength, weight, area, volume, and temperature conversion Free Character counter & byte calculatorCount characters with or without spaces, plus Hangul 2-byte and UTF-8 bytes Free Korean Name RomanizerRomanize Korean names, compare surname spellings and copy five formats. Free English address converterHangul address → English address and postal code, Address Line 1/2·City·State·ZIP format Free Ladder gameRandom ladder for up to 100 people, prize draws, balanced teams and share links Free Printable A4 Paper PDF MakerA4 lined, music and graph paper · writing grids · vector PDF and PNG Free Create a graph paper PDF1mm squared paper, 5mm, 2cm, dot graph paper, A4 printing Free Smart whitespace removerClean up broken paragraphs and unnecessary spaces Free Emoji copy & special character collectionSearch 2,116 emojis and rare symbols, collect and copy Free Create a free QR codeAdd a logo and color, Wi-Fi notice PDF Free

Image tools

Combine photos, aspect ratio, resize, background removal, pixel art

Combine photosCombine horizontally, vertically, or in a grid at the original size Free Image ratio calculatorCheck the width and height ratio and the size Free Batch image resizer and converterResize and convert multiple images Free Background removal & resizeBackground removal and dimension adjustment Free Emote size converterSquare PNGs for Discord, Slack and Twitch, byte references and ZIP downloads Free Free Hangul font previewCompare Korean font families with your text, purpose filters and PNG exports Free Image to pixel art conversionConvert a photo to dot style Free

Game tools

Lineage clan emblem, guild mark, gacha probability calculation

Lineage clan emblem generatorCreate 24x18·16x12 BMP clan emblems Free Lineage clan emblem gallery400 16x12 BMP designs Free MapleStory guild mark generatorCreate an actual 17x17 guild mark Free MapleStory guild mark gallery500 17x17 PNG and JPG designs Free R2 guild mark generatorCreate a 24x24 gmark.bmp Free Dungeon & Fighter guild mark generatorCreate a sharp 28x28 PNG Free Black Desert guild mark generatorCreate a 60x60 Gmark.png Free Gacha probability calculatorExpected pulls with hard pity and pity rules Free