免费在线工具
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
Case Converter
Convert text between uppercase, lowercase, title case, camelCase, snake_case, and more.
Used 0 times•Updated never
Text Reverser
Reverse text by characters, words, or lines with live preview and Unicode-safe handling.
Used 0 times•Updated never
Remove Duplicate Lines
Remove duplicate lines from text with options to ignore case, trim whitespace, sort, and keep only unique lines.
Used 0 times•Updated never
Palindrome Checker
Check whether text reads the same forwards and backwards, with options to ignore case, spaces, and punctuation.
Used 0 times•Updated never
Readability Checker
Analyze text readability with Flesch, Flesch-Kincaid, SMOG, Coleman-Liau, ARI, and Gunning Fog scores.
Used 0 times•Updated never
BMI Calculator
Calculate Body Mass Index from metric or imperial measurements with health-range guidance.
Used 0 times•Updated never
Age Calculator
Calculate exact age in years, months, and days from a birth date, with next birthday countdown.
Used 0 times•Updated never
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
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