All tools
91 free tools in 13 categories. Every one runs in your browser, and nothing is uploaded.
Developer Tools
Decode JWTs, format SQL, compare JSON and XML, build cron expressions, encode Base64 and generate hashes.
Base64 Encoder & Decoder
Base64 and Base32 for text, files and images.
Cron Expression Generator
Build or decode a cron expression and see its next 10 run times.
Hash Generator
MD5, SHA-1 and SHA-2 digests, plus checksum verify.
JSON Compare
Find the real differences between two JSON files.
JWT Decoder
Decode a JWT and see exactly when it expires.
List Compare Tool
All four set operations on two lists at once.
SQL Formatter & Syntax Checker
Check a query for errors, then format it. Five dialects.
Text to CSV Converter
Turn delimited or aligned text into valid CSV.
URL Encoder & Decoder
Percent-encode URLs, query values and SVG for CSS.
XML Compare
Compare XML structurally, not as plain text.
XML to CSV Converter
Flatten XML to CSV without losing your attributes.
Compliance & Accessibility
Check colour contrast against WCAG 2.2, write an accessibility statement, and see whether the European Accessibility Act applies to you.
Business & Finance
Work out take-home pay in Arkansas, Michigan, Texas, Georgia, Washington, Maryland and Indiana, work out a monthly car payment with the new interest deduction, a home loan payment with the month PMI comes off, a percentage increase across a whole list, price a job, take sales tax off a total, see what reinvested dividends add up to, and estimate dental costs.
CoastFIRE Calculator
The number that lets you stop saving and still retire on time.
Dental Implants Cost Calculator
Itemized implant costs by state, with insurance and monthly payments.
Dental Insurance Cost Estimator
What your dental plan pays and what you pay, procedure by procedure.
DRIP Calculator
Reinvested dividends against dividends taken as cash, side by side and after tax.
Free Job Estimate Calculator
Price a job, then see what a discount does to your margin.
GA Paycheck Calculator
Georgia take-home pay for 2026, at the new 4.99% rate and $15,000 standard deduction.
Home Loan Calculator
Your monthly home loan payment with tax, insurance and PMI, and the exact month PMI can come off.
Indiana Paycheck Calculator
Take-home pay after federal tax, Indiana's 2.95% and your county tax.
Maryland Paycheck Calculator
Take-home pay after federal, Maryland and county tax, for all 24 jurisdictions.
Monthly Car Payment Calculator
Your monthly car payment with tax, fees and trade-in, plus the 2025 to 2028 car loan interest deduction.
Paycheck Calculator Michigan
Michigan take-home pay with all 24 city income taxes and the new 2026 state deduction for tips and overtime.
Paycheck Calculator Texas
Texas take-home pay after federal tax and FICA, with the 2026 W-4 overtime, tips and seniors deductions.
Percentage Increase Calculator
The percentage increase between two numbers, a number plus a percentage, the original before an increase, or a whole list.
Reverse Sales Tax Calculator
Take the tax off a price, or work out the rate you were charged.
Salary Calculator Arkansas
Arkansas take-home pay on the 2026 state formula, with the Texarkana exemption and the low-income rates check.
Share Incentive Plan Calculator
What your UK SIP is worth, and the tax if you take the shares out early.
Washington Paycheck Calculator
Take-home pay after federal tax, Paid Leave and WA Cares. No state income tax.
Text & Content
Count words, keywords and Chinese characters, clean pasted text, compare drafts, convert case, find hidden characters, and come up with a band name that nobody already uses.
Band Name Generator
Band name ideas for ten genres, checked against MusicBrainz to see whether a real artist already uses them.
Case Converter
Convert text to upper, lower, title or code case.
Chinese Word Counter
Chinese characters (字数) and words (词数), with every counting method shown.
Cipher Decoder & Identifier
Work out which cipher it is, then decode it.
Claude Watermark Checker
Measure Claude-generated text and check for artifacts.
Hebrew Gematria Calculator
Hebrew gematria in four methods at once, with every letter's value.
Invisible Character Detector
Find hidden characters, hidden markup and encoded payloads.
Keyword Count & Density Checker
Count a keyword, see its density, and find every match.
Reading Time Calculator
How long your text takes to read or say aloud.
Text Cleaner
Strip formatting from pasted text, and see exactly what changed.
Text Compare
Diff two texts by line, word or character.
Word Counter
Count words, characters, sentences and pages live.
Converters & Units
Turn a video into an MP3, check 3D print files and product CSVs, and convert number bases and Discord timestamps.
Discord Timestamp Generator
All seven Discord timestamp formats, with previews.
Hex, Binary & ASCII Converter
Convert between text, hex, binary, decimal and octal.
STL & OBJ Viewer with Print-Readiness Check
View an STL or OBJ file and find out whether it will print.
WooCommerce Product CSV Checker
Check a WooCommerce product CSV before you import it.
YouTube to MP3 Converter
Turn a YouTube video you are allowed to use into an MP3, in your browser.
Date & Time
Days between dates, working days, age, half birthdays, time zones and Unix timestamps.
Age Calculator
Work out an age, or the gap between two people.
Date Duration Calculator
Count the days between two dates, both ways.
Epoch & Unix Timestamp Converter
Unix timestamps to dates and back, in any unit.
Half Birthday Calculator
Your half birthday by both definitions, with a countdown and the next ten.
Time Zone Converter
Convert between zones and UTC, with a live UTC clock.
Working Days Calculator
Working days, your weekend, your public holidays.
Engineering
Work out the volume of a cylinder, cubic yards of mulch, soil or concrete, count concrete blocks and mortar for a wall, size a boiler feed pump, and estimate bitumen and asphalt quantities, with the working shown.
Bitumen Calculator
Bitumen, aggregate and total asphalt mix for a road or surface.
Boiler Feed Pump Calculation
Size a boiler feed pump: flow, head, power, motor and NPSH, with the working shown.
Concrete Block Calculator
Blocks, mortar and core fill for a block wall, with doors and windows taken off.
Cubic Yard Calculator
Cubic yards for several areas of any shape, with extra for waste, bags and cost.
Volume of a Cylinder Calculator
Cylinder volume with a separate unit for each length, in gallons and litres, for solid, hollow and partly full cylinders.
Fitness
Turn a race time into a VDOT and training paces, score the Marine Corps PFT and CFT, compare powerlifting totals, and set your bike tire pressure from your weight.
Bike Tire Pressure Calculator
Front and rear pressure for 20 to 37 mm tires, from Frank Berto's 15% tire drop chart.
DOTS Calculator
Your powerlifting DOTS score and IPF GL points, plus the total you need for a goal score.
PFT Calculator
USMC PFT and CFT scores, class, and what it takes to reach the next one.
VDOT Calculator
Your VDOT, five training paces and equivalent race times from one race. Compare two races or check a goal.
Gaming
Check a Blox Fruits trade on two value lists, your WoW Mythic+ rating and the keys to your next milestone, your OSRS combat level and the cheapest XP to the next one, Old School RuneScape drop odds and Construction plans, Dragon Ball Legends friend-code QR codes, and fair odds from a sportsbook line.
Blox Fruits Calculator
A Blox Fruits trade calculator that checks your trade on two public value lists, and shows when they disagree.
Construction Calculator OSRS
Plan OSRS Construction in stages, with one shopping list and live GE prices.
DBL Code Generator
Turn Dragon Ball Legends friend codes into scannable QR codes, and read codes back.
Mythic Calculator WoW
Your WoW Mythic+ rating from your best key in each dungeon, and the fastest keys to your next milestone.
No Vig Calculator
Fair odds from a sportsbook line, by three methods, for two outcomes or up to eight.
OSRS Combat Calculator
Your OSRS combat level, the fewest XP to any target level mixing skills, and how far a pure can train before leveling.
OSRS Dry Calculator
How dry you really are on an OSRS drop, and how many more kills it might take.
Education
Estimate your AP score in eleven subjects from practice-exam results, with the conversion table shown, and check your age eligibility for every UPSC exam, from the Civil Services to CDS and NDA.
Age Calculator of NDA
Your NDA age eligibility and attempts left, exam by exam, from the UPSC age rule.
Age Calculator of UPSC
Whether your age lets you sit CSE 2027, your last Civil Services year and attempts left, plus every other UPSC exam from IFoS to NDA.
AP Biology Score Calculator
AP Bio practice results to a 1-5 estimate, with the curve shown.
AP Calc Score Calculator
AP Calculus AB or BC practice results to a 1-5 estimate, on the 42 or 45-question paper.
AP Calculus AB Score Calculator
AP Calc AB practice results to a 1-5 estimate, on the current 42-question exam.
AP Chemistry Score Calculator
Turn AP Chem practice results into a 1-5 estimate, with the curve shown.
AP Gov Score Calculator
AP US Government practice results to a 1-5 estimate, with each free-response part scored on its own.
AP Lang Score Calculator
AP Lang practice results to a 1-5 estimate, with each essay scored rubric row by rubric row.
AP Psych Calculator
AP Psychology practice results to a 1-5 estimate, scored rubric part by rubric part.
AP Stats Score Calculator
AP Statistics practice results to a 1-5 estimate, for the new 2027 exam or the old format.
AP World Score Calculator
AP World History practice results to a 1-5 estimate, with the DBQ and long essay scored row by row.
APUSH Score Calculator
AP US History practice results to a 1-5 estimate, with the DBQ and long essay scored row by row.
Home & Garden
Work out topsoil for a lawn or raised bed, dirt to order or haul away, tons of landscape rock or sand, where to put recessed lights, how long to cut rafters, and the salt a saltwater pool needs, with the source of every figure shown.
Dirt Calculator
Cubic yards, tons and truckloads of dirt, whether you are filling in or digging out.
Pool Salt Calculator
How much salt your pool needs, and how many bags to buy.
Rafter Calculator
Rafter length, cut angles and birdsmouth, plus the board length to buy and how many.
Recessed Lighting Calculator
How many recessed lights a room needs, where each one goes, and whether any lands on a joist.
Rock Calculator
Tons and cubic yards of landscape rock, with an honest range for the weight.
Sand Calculator
Tons, cubic yards and bags of sand, with the weight shown as a dry-to-wet range.
Topsoil Calculator
Cubic yards and bags of topsoil for lawns and beds, with a mix split and a bulk or bags check.
Health
Calculate the fractional excretion of sodium (FENa) and urea from lab values, with the unit conversions done for you.
Astrology
Find your first, second and third Saturn return dates, with Saturn's position checked against NASA JPL data.
All tools run in your browser. We never upload your files.