Free everyday tools, zero uploads.

16 calculators, converters and generators — every one runs 100% in your browser. No sign-up, no server, nothing you type or upload ever leaves your device.

Text & Writing

Case Converter Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case and more. Title Capitalizer Capitalize titles correctly in APA, AP, Chicago or MLA style as you type.

Image

Image Resizer Resize, crop and compress images to exact pixels or a target file size — right in your browser. HEIC to JPG Convert iPhone HEIC photos to JPG instantly. Nothing is uploaded — 100% private. Favicon Generator Generate a complete favicon set (ICO + PNG) from text, emoji or an image.

Random & Fun

Spin the Wheel Enter names or options and spin the wheel to pick a random winner. Random Picker Pick random items from a list, shuffle, or split people into teams. Coin Flip Flip a virtual coin — heads or tails — with stats for multiple flips.

Life & Money

TDEE Calculator Calculate your Total Daily Energy Expenditure, BMR and calorie targets for cutting or bulking. Sleep Calculator Find the best time to go to bed or wake up based on 90-minute sleep cycles. Sunrise & Sunset Sunrise, sunset, golden hour and day length for any location and date. Compound Interest See how your savings grow with compound interest and monthly contributions.

Dev & Web

Unix Timestamp Converter Convert Unix epoch timestamps to human-readable dates and back — seconds or milliseconds. UUID Generator Generate random UUIDs (v4, v7, v1, v5) one at a time or in bulk. Color Converter Pick a color and convert between HEX, RGB and HSL, with shades, tints and harmonies. Meta Tag Generator Generate SEO meta tags and Open Graph / Twitter cards with a live preview.

Why CalcuCalcu?

Every tool on this site is built the same way: the page loads once, and all the work — converting, calculating, generating, resizing — happens in your browser with plain JavaScript. That makes the tools fast, keeps them free, and means your data (photos, text, birth dates, salaries) is never sent anywhere.