Email Normalizer
Reduce every address to the mailbox it delivers to.
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Invoice Header Generator
A clean invoice header: logo, business details, document title and the key numbers.
Excel Invoice Template
A real .xlsx invoice with live formulas — change a quantity and it recalculates.
APCA Contrast Checker
Score a colour pair with APCA, the contrast model behind WCAG 3.
JSONL Validator
Validate a JSONL file line by line, and check fine-tuning datasets before you upload.
ChatGPT Custom Instructions Generator
Write both custom instruction boxes, each checked against the 1,500 character limit.
Coordinates Converter
DMS to decimal degrees and back — plus UTM, in bulk, with map links.
GPX to KML Converter
Turn a GPS track into a KML file you can open in Google Earth or Google Maps.
Text to Braille Converter
Turn text into Unicode braille cells — capitals, numbers and punctuation included.
Decimal to Fraction Converter
Exact fractions from decimals — repeating decimals too — with the working shown.
Number to Words Converter
Spell out any number in English or Bangla, with lakh and crore or million and billion.
Paper Size Converter
A4, Letter, A3, B5 and 60 more in mm, inches, points and pixels at any DPI.
Cooking Measurement Converter
Cups, spoons, grams, ounces and millilitres — for 40 real ingredients.
Flow Rate Converter
Convert GPM, L/min, m³/h, CFM and cfs — and time how long a fill takes.
Frequency Converter
Hz, kHz, MHz, GHz, rpm, rad/s and BPM — plus period and wavelength.
Plist to JSON Converter
Apple property lists — XML or binary — read as JSON, and JSON written back as a plist.
PHP Serialize to JSON Converter
Unserialize a PHP string into JSON — and back — with byte lengths handled and repairable.
Text to Code Comment
Turn a block of text into a comment in any language, wrapped and aligned.
Code Diff Viewer
Compare two files side by side and export a unified diff.
Regex Tester
Test a regular expression live, with every match and capture group shown.
Cubic Bezier Generator
Draw an easing curve and see it against the standard ones.
HTTP Header Parser
Paste raw HTTP headers and get them parsed, explained and checked.
MongoDB ObjectId Generator
Generate and decode MongoDB ObjectIds, including their embedded timestamp.
Emoji Unicode Lookup
Break an emoji into its code points, modifiers and joiners.
HTML to Markdown
Convert HTML back into clean Markdown, keeping lists, tables and code.
Debt Consolidation Calculator
Whether consolidating your debts actually costs you less.
Mortgage Amortization Calculator
A full payment-by-payment schedule with yearly totals.
Down Payment Calculator
What your down payment buys you in price, payment and LTV.
Triangle Calculator
Solve any triangle from three known sides or angles.
Roman Numeral Calculator
Convert to and from Roman numerals and do arithmetic in them.
Unit Converter Calculator
One converter for length, weight, area, volume, speed, time and more.
Fat Intake Calculator
Daily fat in grams, split into saturated and unsaturated.
Investment Calculator
Project a portfolio with contributions, growth and inflation adjustment.
VAT Calculator
Add or strip VAT at any rate, with presets for common countries.
Gravel Calculator
Gravel by volume and weight, for any material type.
Roofing Calculator
Roof area, squares and bundles from pitch and footprint.
Horsepower Calculator
Horsepower from torque and RPM, or from work over time.
QR Code Reader
Read a QR code from an image or your camera.
Blurhash Generator
Make a tiny blurred placeholder to show while an image loads.
Social Media Image Size Guide
Every current image size for every major platform.
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