Text Hashtag Generator
Turn a caption into a set of usable hashtags.
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Schema Markup Generator
Generate JSON-LD structured data for rich results.
Robots.txt Generator
Build a valid robots.txt with per-crawler rules in a minute.
Invoice Date Extractor
Pull the issue date, due date and every other date out of invoices.
Invoice API Generator
Generate the API call that creates an invoice — Stripe, Xero, QuickBooks or your own REST API.
E-Invoice Generator
Build an EN 16931 e-invoice — Peppol UBL, XRechnung or Factur-X XML — checked as you type.
Invoice Overdue Stamp Generator
Mark an invoice as past due so it cannot be mistaken for the original.
Invoice QR Code Generator
A payment QR for an invoice — EPC, UPI, PIX, a link or the invoice details.
Wholesale Invoice Generator
Trade pricing, case quantities and payment terms on a wholesale invoice.
HEX to SwiftUI Color
Turn a HEX code into SwiftUI Color, UIColor and NSColor code.
Wire Gauge Converter
AWG and SWG to mm², diameter, circular mils and resistance per length.
PHP Array to JSON Converter
A PHP array literal, var_export or print_r output turned into JSON — nothing executed.
Lease Calculator
Any lease: payment, implicit rate or present value.
Estate Tax Calculator
Taxable estate after the exemption, and the tax due.
Sales Tax Calculator
Add sales tax to a price, or strip it back out.
Mutual Fund Calculator
Fund growth after expense ratios and sales loads.
CD Calculator
Certificate of deposit maturity value, APY and early withdrawal.
Interest Rate Calculator
The rate implied by an amount, a payment and a term.
Refinance Calculator
Whether refinancing pays, and how long it takes to break even.
Running Pace Calculator
Race finish times, split tables and a predictor for other distances.
Body Surface Area Calculator
BSA by the Du Bois, Mosteller, Haycock and Boyd formulas.
Interest Calculator
Compare simple and compound interest on the same figures side by side.
Pregnancy Weight Gain Calculator
Recommended weight gain by week, from your starting BMI.
Prime Factorization Calculator
Prime factors, exponent form and a factor tree.
Sample Size Calculator
How many people you need to survey, and the margin of error.
Density Calculator
Density, mass or volume, solving for whichever is missing.
Sleep Calculator
Bedtimes and wake times that land between sleep cycles.
Most Common Word Finder
Find which words a text leans on most.
Keyword List Cleaner
Deduplicate, trim and tidy a messy keyword export.
News Sitemap Generator
Build a Google News sitemap with the 48-hour rule applied.
Sitemap Index Generator
Build the sitemap index file that points at all your sitemaps.
Heading Structure Checker
See the H1 to H6 outline and every level it skips.
Twitter Card Generator
Build the twitter:card tags and preview the result.
HEX to RGB Converter
Convert HEX colour codes to RGB and HSL, and back again.
Invoice Merger
Merge several invoices into one consolidated invoice, or into one combined data file.
Invoice VAT Calculator
Add or remove VAT at any European rate, with the reverse charge explained.
Photography Invoice Generator
Shoot fees, usage licence, retouching and expenses on one photography invoice.
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.
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