All tools
Every Hopi tool, 225 in total, grouped by category. Free, instant, and running entirely in your browser.
Maths & percentages 16
- Discount & sale price calculator
- Fraction calculator
- Fraction to decimal converter
- Mean, median & mode calculator
- Percentage calculator
- Percentage change calculator
- Percentage decrease calculator
- Percentage difference calculator
- Percentage increase calculator
- Prime number & factor calculator
- Ratio calculator
- Right-angle triangle calculator
- Roman numerals converter
- Rounding & significant figures calculator
- Scientific calculator
- Standard deviation calculator
Money & UK 27
- Bill splitter
- CAGR calculator
- Compound interest calculator
- Currency converter
- Day rate to salary calculator
- Energy running cost calculator
- Fuel cost calculator
- Holiday entitlement calculator
- Hourly wage to salary converter
- Loan repayment calculator
- Margin & markup calculator
- Mortgage overpayment calculator
- Mortgage repayment calculator
- National Insurance calculator
- Net to gross salary calculator
- Overtime pay calculator
- Pro-rata salary calculator
- Redundancy pay calculator
- Savings goal calculator
- Stamp duty calculator
- Student loan repayment calculator
- Take-home pay calculator
- Tip calculator
- UCAS points calculator
- UK inflation calculator
- Unit price comparison
- VAT calculator
Text & writing 22
- Alphabetical order sorter
- Caesar cipher & ROT13
- Case converter
- Character counter
- Duplicate line remover
- Emoji remover
- Find and replace
- Lorem ipsum generator
- Morse code translator
- NATO phonetic alphabet translator
- Online notepad
- Reading time calculator
- Remove extra spaces
- Remove line breaks
- Reverse text generator
- Small text generator
- Special characters to copy
- Text repeater
- Text splitter
- Upside down text
- Word counter
- Word frequency counter
Colour & design 13
Date & time 20
- Add working days
- Age calculator
- Cat age calculator
- Countdown to a date
- Date calculator
- Day of the week finder
- Days between dates calculator
- Days until Christmas
- Dog age calculator
- Hours calculator
- Leap year checker
- Minutes to hours converter
- Moon phase calculator
- Pomodoro timer
- Star sign calculator
- Stopwatch
- Time calculator
- Time zone converter
- What week number is it?
- Working days calculator
Random & generators 27
- Barcode generator
- Bingo card generator
- Bulk QR code generator
- Coin flip
- Combination generator
- Dice roller
- EuroMillions number generator
- Fortune cookie
- Lottery number generator
- Magic 8 ball
- Passphrase generator
- Password generator
- QR code generator
- Random coordinates generator
- Random letter generator
- Random number generator
- Random team generator
- Random word generator
- Reaction time test
- Scratch card
- Secret Santa generator
- Slot machine name picker
- Spin the bottle
- Typing speed test
- Username generator
- Wheel spinner
- Yes or no
Converters & units 23
- Angle converter
- Area converter
- Aspect ratio calculator
- Cm to feet converter
- Cups to grams converter
- Data size converter
- Download time calculator
- Kg to stone converter
- Length converter
- Litres to pints converter
- MPG converter
- Miles to km converter
- Military time converter
- Number to words converter
- Oven temperature converter
- Power converter
- Pressure converter
- Ring size converter
- Shoe size converter
- Speed converter
- Temperature converter
- Volume converter
- Weight converter
Health & fitness 10
Dev & data 31
- Base64 encode & decode
- CSS minifier
- CSV to JSON converter
- Cron expression translator
- Diff checker
- Dummy data generator
- Email link generator
- HTML escape & unescape
- HTML text & link extractor
- HTTP status code reference
- Hash generator
- Inline CSS converter
- JSON formatter
- JSON to CSV converter
- JWT decoder
- Markdown previewer
- Meta tag generator
- Number base converter
- Password strength checker
- Regex tester
- Robots.txt generator
- SEO meta tag analyser
- SQL formatter
- Schema markup generator
- Slug generator
- URL encode & decode
- URL parser
- UTM link generator
- UUID generator
- Unix timestamp converter
- XML formatter
Crypto 9
Files & data 27
- Add to calendar file generator
- CSV to Excel converter
- Dummy file generator
- Dummy image generator
- EXIF remover
- Excel to CSV converter
- Excel to JSON converter
- Excel to XML converter
- Favicon generator
- File hash checker
- HEIC to JPG converter
- Image compressor
- Image cropper
- Image resizer
- Image to Base64 converter
- JPG to PDF converter
- JPG to PNG converter
- JSON to Excel converter
- Merge PDF files
- PNG to JPG converter
- Photo metadata (EXIF) viewer
- Rotate & flip image
- SVG to PNG converter
- Signature generator
- Split PDF
- WebP to JPG converter
- XML to Excel converter