Browse 22 categories with 278+ free tools
12 tools
Convert between units of length, weight, temperature, speed, volume, area, data, time, pressure, energy, fuel efficiency, and angles.
18 tools
Calculate percentages, fractions, roots, logarithms, prime numbers, and convert between number bases and formats.
26 tools
Count words, check grammar and spelling, find rhymes and definitions, convert case, compare text, and transform text in many ways.
10 tools
Convert color formats, generate palettes, check contrast, create gradients, and explore color combinations.
33 tools
Format JSON, encode Base64 and URLs, test regex, decode JWTs, validate HTML, and check npm packages for size and known vulnerabilities.
Calculate interest, loans, mortgages, tips, ROI and margins, convert salaries, and convert 150+ currencies, crypto, and gold.
Calculate BMI, calories, body fat, macros, heart rate zones, ideal weight, and running pace.
19 tools
Calculate ages, date differences, and working days, see public holidays and long weekends, convert time zones, and track moon phases.
Convert images to Base64, generate QR codes, resize images, extract colors, and create favicons - all client-side.
16 tools
Generate passwords, check their strength and data breaches, create hashes, encrypt text, detect IP info, and parse user agents.
Flip coins, roll dice, pick random names, generate lottery numbers, spin decision wheels, and create teams.
8 tools
Calculate Ohm's law, resistor color codes, power consumption, voltage dividers, and LED resistors.
14 tools
Look up DNS, WHOIS, and SPF, DKIM and DMARC records, calculate subnets, convert IP addresses, find postal codes, and validate IBANs.
11 tools
Generate meta tags, check security headers, unshorten links, find Wayback Machine snapshots, and look up HTTP status codes and MIME types.
5 tools
Convert Docker run commands to Compose, check software end-of-life dates, browse Git and regex cheatsheets, and build cron expressions.
Merge, split, rotate, compress, protect, and extract text from PDF files - all processed in your browser.
6 tools
Convert between CSV, Excel, ZIP, Markdown, and Word formats. Create and extract archives - all client-side.
Calculate grades and GPA, generate APA and MLA citations, test typing and reading speed, score readability, and make flashcards.
Calculate standard deviation, mean, median, mode, probability, combinations, normal distribution, and sample sizes.
Estimate materials for concrete, paint, tile, fence, and wallpaper projects. Calculate quantities and coverage.
7 tools
Convert cooking measurements, scale recipes, convert shoe, clothing, and ring sizes, and find the elevation of any place.
3 tools
Decode a VIN, check a vehicle for open safety recalls, and look up crash test ratings using official US government data.