34 tools · free · no sign-up

Free tools

Calculators, converters and developer utilities that run in your browser. Nothing you enter is uploaded. Start typing to filter, or pick a category.

Business & cost calculators

4 tools

Run the numbers on software spend, automation and pipeline before you commit.

FoundersAutomation ROI CalculatorFind your exact monthly savings or lossFoundersWorkflow Automation Cost CalculatorCompare Zapier, Make & n8n pricingFoundersSales Pipeline EstimatorForecast monthly pipeline valueFoundersAI Coding Tool Cost CalculatorCopilot, Cursor & Claude Code costs

Date & time

5 tools

Ages, date gaps, time zones, stopwatch and timers.

FeaturedAge CalculatorExact age in years, months, and daysDays Between DatesCount days between any two datesTime Zone ConverterCompare times across time zonesOnline StopwatchSimple stopwatch with lap timesOnline Countdown TimerSet a timer for any duration

Developer & encoding

8 tools

Formatters, hashes, encoders and generators for everyday dev work.

FeaturedJSON Formatter & ValidatorFormat, validate, and minify JSONUUID GeneratorBulk v4 UUIDs, one click copyFeaturedPassword GeneratorStrong, random, customizable passwordsBase64 Encoder/DecoderEncode or decode Base64 textURL Encoder/DecoderPercent-encode or decode a URLMD5 Hash GeneratorGenerate an MD5 hash from textSHA256 Hash GeneratorGenerate a SHA-256 hash from textUnix Timestamp ConverterConvert between Unix time and dates

Unit converters

3 tools

Length, weight and temperature, both directions.

Length ConverterMeters, feet, inches, and moreWeight ConverterKilograms, pounds, ounces, and moreTemperature ConverterCelsius, Fahrenheit, Kelvin

Math & finance

5 tools

Percentages, interest, sales tax and number conversions.

Roman Numeral ConverterConvert numbers to and from Roman numeralsSales Tax CalculatorAdd or remove sales tax from a pricePercentage Increase CalculatorPercent change between two valuesFeaturedCompound Interest CalculatorGrowth with compounding interestNumber to Words ConverterSpell out any number in words

Text & writing

5 tools

Count, convert, clean and encode text.

FeaturedWord CounterWords, characters, sentences, reading timeCase ConverterUpper, lower, title, sentence caseRandom Word GeneratorGenerate random words instantlyROT13 / Caesar CipherEncode or decode a simple cipherSlug GeneratorTurn any text into a clean URL slug

Education

1 tool

Grade and GPA tools for students.

GPA CalculatorWeighted and unweighted GPA

Generators & fun

3 tools

QR codes, placeholder text, dice and coin flips.

FeaturedQR Code GeneratorFree QR codes for links and textLorem Ipsum GeneratorPlaceholder text by word, sentence, or paragraphDice Roller & Coin FlipRoll dice or flip a coin online