All tools
45 free tools in 10 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
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
Price a job, take sales tax off a total, estimate dental implant costs, and work out what your dental insurance pays and what you pay.
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.
Free Job Estimate Calculator
Price a job, then see what a discount does to your margin.
Reverse Sales Tax Calculator
Take the tax off a price — or work out the rate you were charged.
Text & Content
Count words, keywords and Chinese characters, clean pasted text, compare drafts, convert case and find hidden characters.
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, time zones and Unix timestamps.
Age Calculator
Work out an age, or the gap between two people.
Business Days Calculator
Working days, your weekend, your public holidays.
Date Duration Calculator
Count the days between two dates, both ways.
Epoch & Unix Timestamp Converter
Unix timestamps to dates and back, in any unit.
Time Zone Converter
Convert between zones and UTC, with a live UTC clock.
Engineering
Size a boiler feed pump and work out bitumen, aggregate and asphalt quantities, with every step of the working shown.
Fitness
Score the Marine Corps PFT and CFT, and plan the reps or seconds you need for the next class.
Gaming
Old School RuneScape drop odds and Dragon Ball Legends friend-code QR codes.
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.