A curated collection of free browser-based tools for developers, writers, students and everyday users. No signup, no tracking.
Count words, characters, sentences and reading time in real time. Free forever.
Count characters for Twitter, Instagram, SMS and LinkedIn. Platform limits shown live.
Flesch-Kincaid reading ease score and grade level for any text instantly.
UPPERCASE, lowercase, camelCase, snake_case, Title Case and more in one click.
Generate UUID v1, v4, v5, v7, GUID and Nil UUIDs. RFC 9562 compliant. uuidcore.com
Check how strong your password is instantly. 100% client-side. passwordstrength.net
Decode Base64 strings and files in your browser. base64decode.tools
Encode text or files to Base64 format instantly. base64encode.tools
URL encode and decode strings and query parameters. urlencodedecode.com
Format, validate, minify and convert JSON in your browser. jsontools.tools
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text or file. hashgenerator.tools
Calculate area for rooms, floors and land. thesquarefootagecalculator.com
Calculate percentages, percentage change and more. bestpercentagecalculator.net
Calculate exact age in years, months and days from any date. theagecalculator.net
Convert between Unix timestamps and human-readable dates across any timezone. epochtime.tools
Repeat any text up to 100,000 times with custom separators. textrepeat.net
Build and decode cron expressions with plain-English explanations. crontabsheet.com
Build, test, and explain regular expressions with code in 7 languages. regexguide.com
Convert text between Title Case, sentence case, camelCase, snake_case, kebab-case and more. transformcase.com
Engineering and scientific unit converter with printable reference tables. unitcheatsheet.com
Hours, timesheets, and overtime pay. Breaks, overnight shifts, and 50+ time zones. calculatehours.net
Online alarm clock, timer, stopwatch, and world clock. Browser-based, no signup. clockwithus.com
Convert between profit margin and markup, with fees, shipping, tax, and break-even. marginvsmarkup.com
Billable shipping weight for FedEx, UPS, USPS, DHL and more carriers. dimweightcalc.com
Calculate the volume of a box from its length, width, and height in any units. boxvolumecalculator.com
Parcel length-plus-girth against carrier limits, plus body circumference for fitness. girthcalculator.com
Free, unbiased solar and off-grid calculators — sizing, payback, and battery banks. prosolarcalc.com
Calculate, split, and visualize subnets. IPv4/IPv6, VLSM, cloud-aware, Terraform export. cidrcalculator.net
Network/broadcast addresses, usable host range, wildcard masks, and VLSM planning. subnetmaskcalc.net
Browser-based image tools — compress, convert, resize, crop, and watermark. No uploads. pictoolkit.com
Strip EXIF, GPS, and hidden metadata from images, PDFs, and Office files, in-browser. removemetadata.tools
Calculate EMI for home, car and personal loans with full amortization schedules. indiaemi.com
Merge, split, compress and convert PDF files right in your browser. corepdftools.com
Convert between HEX, RGB, HSL and build color palettes for design. colorcodekit.com
Generate QR codes and barcodes for any text, URL or product. barcodeandqr.com
Calculate voltage drop for wire runs by gauge, length and current. voltdropcalc.com
Calculate daily calorie needs, BMR and macros for your goals. calorieskit.com
See the total interest paid over the full life of any loan. totalinterestcalc.com
Size air-conditioning tonnage for any room or space. actonnagecalc.com
Calculate volume and capacity for tanks of any shape. tankvolumecalc.com
Calculate cubic yards for concrete, mulch, gravel and soil. cubicyardage.com
Calculate your Body Mass Index and Basal Metabolic Rate. bmibmrcalc.com
Size a solar battery bank for your off-grid power needs. solarbatterybankcalc.com
Add, subtract, multiply and divide fractions with step-by-step working. fractionsteps.com
Size a generator or UPS for your backup power requirements. backuppowercalc.com
Convert cooking weights, volumes and measurements for recipes. measurechef.com
Convert numbers to words for checks, invoices and documents. numtotext.com
Calculate stair rise, run, stringer length and angle. staircalculators.net
Estimate concrete, cement, sand and aggregate for any project. concretematerialcalc.com
Calculate returns on systematic investment plans and mutual funds. sipcalculatorhub.com
Estimate shingles, materials and cost for any roof size. roofingmaterialcalc.com
Calculate your GPA and CGPA across any grading scale. gpacalculatorhq.com
Free construction calculators for materials, area and estimates. constructioncalchq.com
Calculate pool water volume in gallons for any pool shape. poolvolumecalc.com
Test your download, upload and ping speeds instantly. checkinternetspeed.tools
Find your public IP address, location and network details. checkmyipnow.com
Look up domain registration, ownership and DNS records. whoislookuppro.com