免費線上工具
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 tools26810.8K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
Loan Calculator
Calculate monthly loan payments, total interest, and a full amortization schedule for any loan.
Used 0 times•Updated never
Mortgage Calculator
Estimate monthly mortgage payments including principal, interest, taxes, insurance, PMI, and HOA.
Used 0 times•Updated never
Currency Converter
Convert amounts between world currencies using live mid-market exchange rates.
Used 0 times•Updated never
Unit Converter
Convert length, weight, temperature, volume, area, speed, time, data, pressure, force, energy, power, torque, density, and flow rate units instantly. Metric and imperial. Free, browser-based.
Used 0 times•Updated never
Calorie Calculator
Estimate daily calories from BMR and activity level, with targets for weight loss, maintenance, or gain.
Used 0 times•Updated never
GST Calculator
Add or remove GST from an amount with standard India slabs and CGST/SGST or IGST breakdown.
Used 0 times•Updated never
GST Invoice Generator
Create GST-compliant tax invoices with CGST, SGST, or IGST, HSN/SAC codes, and PDF export.
Used 0 times•Updated never
Discount Calculator
Calculate sale price, savings, and discount amount from percentage or fixed discounts.
Used 0 times•Updated never
Profit Calculator
Calculate gross profit, net profit, profit margin, and markup from revenue, cost, and expenses.
Used 0 times•Updated never
Break Even Calculator
Find how many units or how much revenue you need to cover fixed costs and break even.
Used 0 times•Updated never
Sales Tax Calculator
Add or remove sales tax from any amount — US state presets, custom rates, and instant totals.
Used 0 times•Updated never