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268+ free online tools for PDF, images, SEO, developers, color, and productivity. Fast, browser-based, and private — no signup, no installs, no limits. Search above or browse by category below.
Total tools26810.9K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
ROI Calculator
Calculate return on investment (ROI), net gain, and annualized ROI from your initial investment and returns.
Used 0 times•Updated never
Calories Calculator
Estimate calories burned during workouts and daily activities from your weight, duration, and activity intensity.
Used 0 times•Updated never
Nutrition Calculator
Convert between macronutrient grams and calories, or split a calorie target into protein, carbs, and fat.
Used 0 times•Updated never
Water Intake Calculator
Estimate your daily water needs from body weight, activity level, climate, and exercise duration.
Used 0 times•Updated never
Protein Calculator
Estimate daily protein needs from body weight, training goals, and meal count with per-meal targets.
Used 0 times•Updated never
Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method with neck, waist, and hip measurements.
Used 0 times•Updated never
Macro Calculator
Plan daily protein, carbs, and fat from your calorie target or estimated needs, with per-meal macro splits.
Used 0 times•Updated never
Restaurant Profit Calculator
Calculate restaurant net profit, food and labor costs, prime cost ratio, and profit margins from sales and operating expenses.
Used 0 times•Updated never
Scientific Calculator
Perform basic and scientific calculations with trigonometry, logarithms, powers, and degree or radian mode.
Used 0 times•Updated never
Tip Calculator
Calculate tip amount, total bill, and fair split per person with quick percentage presets.
Used 0 times•Updated never
Receipt Generator
Create printable sales receipts with items, tax, payment details — preview, print, or download as PDF.
Used 0 times•Updated never
SKU Generator
Generate product SKU codes from brand, category, product, color, size, and variant fields with custom separators and sequences.
Used 0 times•Updated never