A directory of free, no-sign-up online tools — including our sister sites and other utilities we find genuinely useful.
Calculate area in square feet for rooms, floors, and land.
Find exact age in years, months, and days between two dates.
Encode or decode Base64 text and files, URL-safe variant included.
Percent-encode or decode URLs and query strings with UTF-8 support.
Test password strength and entropy locally in your browser.
Count words, characters, sentences, and reading time.
Generate and validate UUIDs (v1, v4, v7) in bulk.
Format, validate, minify, and query JSON.
MD5, SHA-1, SHA-256, and SHA-512 for text and files.
Convert Unix timestamps to and from human dates.
Repeat text or lines N times with custom separators.
Build and decode cron expressions in plain English.
Test, explain, and learn regular expressions.
Quick conversions across common measurement units.
Add up work hours and time between two times.
Compare the current time across time zones.
Convert text between upper, lower, title, and more.
Calculate shipping dimensional (volumetric) weight.
Resize, convert, and compress images in your browser.
Compute box volume and capacity from dimensions.
Calculate package girth for shipping limits.
Convert between profit margin and markup.
Compute IP ranges, hosts, and masks from CIDR.
Plan subnets, masks, and address ranges.
Strip EXIF, GPS, and hidden metadata from files.
Size solar systems and estimate output.
Calculate loan EMIs, interest, and schedules.
Merge, split, and compress PDFs locally.
Convert and explore HEX, RGB, and HSL colors.
Generate barcodes and QR codes.
Calculate wire voltage drop for electrical runs.
Estimate calorie needs and macros.
See total interest paid over a loan term.
Estimate air-conditioner tonnage by room size.
Compute tank capacity for many shapes.
Calculate cubic yards for concrete, mulch, and soil.
Find body mass index and basal metabolic rate.
Size battery banks for solar storage.
Solve fraction math with step-by-step working.
Size generators and UPS backup for your loads.
Convert cooking measurements and ingredients.
Convert numbers into written words.
Calculate stair rise, run, and stringer lengths.
Estimate concrete volume and bags needed.
Project mutual-fund SIP returns over time.
Estimate roofing materials and squares.
Compute GPA from grades and credit hours.
A hub of construction estimating calculators.
Find pool water volume in gallons or liters.
Measure your download and upload speed.
See your public IP and network details.
Look up domain registration and WHOIS data.