Invoice Merger
Merge several invoices into one consolidated invoice, or into one combined data file.
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Invoice Image to Text
Turn a photo of an invoice or receipt into copyable text, privately, in seconds.
E-Invoice Validator
Check a UBL or CII e-invoice against the EN 16931, Peppol and XRechnung business rules.
Invoice VAT Calculator
Add or remove VAT at any European rate, with the reverse charge explained.
Google Sheets Invoice Template
A block of cells and formulas to paste straight into a blank Google Sheet.
Invoice Generator
Build a professional invoice in your browser and print, download or export it.
HTML Color Names Chart
All 148 CSS colour names, searchable and sortable.
Gradient Border Generator
Put a gradient on a border — and keep the rounded corners.
Complementary Color Finder
Find the true complement of any colour, and the near ones.
Tabs to Spaces Converter
Convert indentation between tabs and spaces, with tab stops handled properly.
M4A to MP3 Converter
Turn Apple M4A and AAC audio into MP3 that plays on anything.
SRT to VTT Converter
SubRip subtitles as WebVTT, ready for the HTML5 video track element.
Take-Home-Paycheck Calculator
What actually lands in your account after every deduction.
IRR Calculator
Internal rate of return and NPV from any cash flow series.
Circle Calculator
Solve a circle from radius, diameter, circumference or area.
Body Type Calculator
Body shape from bust, waist and hip measurements.
BMR Calculator
Basal metabolic rate: the calories you burn doing nothing at all.
Investment Calculator
Project a portfolio with contributions, growth and inflation adjustment.
Common Factor Calculator
Shared factors of two or more numbers, with the highest marked.
Half-Life Calculator
Half-life, decay constant, mean lifetime and remaining amount.
Number Sequence Calculator
Arithmetic, geometric and Fibonacci terms and sums.
Surface Area Calculator
Surface area of ten solids, with the formula shown.
Heat Index Calculator
Apparent temperature from heat and humidity, with risk levels.
Engine Horsepower Calculator
Estimate engine power from quarter-mile trap speed or ET.
Lowercase Converter
Convert text to lowercase, including accented and non-Latin letters.
Lowercase Letter Counter
Count lowercase letters and check the case balance of a text.
Invoice OCR to Excel
Read scanned invoices and get a real .xlsx workbook — one row per invoice, or one per line.
Accessible Color Generator
Nudge a colour until it passes WCAG, keeping its hue.
Tailwind Palette Generator
Turn one colour into a full 50–950 Tailwind scale.
Color Mixer
Blend two colours and see every step between them.
EPUB to Text Converter
Read an EPUB as plain text — chapter by chapter, in reading order.
JSON to INI Converter
JSON into INI sections — dotted section names for nesting, three list styles.
XML to CSV Converter
Find the repeating element in an XML feed or export and turn it into spreadsheet rows.
IRA Calculator
Traditional against Roth, compared on an after-tax basis.
Canadian Mortgage Calculator
Canadian mortgage with semi-annual compounding and CMHC insurance.
Weight Calculator
Convert weights and work in stones, pounds and ounces.
Target Heart Rate Calculator
Training zones from maximum or heart rate reserve.
Body Fat Calculator
Estimate body fat percentage from tape measurements.
Markup Calculator
Set a selling price from cost plus markup, with the margin shown.
Bandwidth Calculator
Download time, data usage and the speed you need.
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