Rent Calculator
How much rent you can afford on your income.
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Rent vs. Buy Calculator
Which costs less over your time horizon, renting or owning.
Length Calculator
Convert lengths and add or subtract feet and inches.
Fuel Cost Calculator
Work out what a trip costs in fuel and split it between passengers.
Protein Calculator
Daily protein in grams for your body weight and goal.
Body Fat Calculator
Estimate body fat percentage from tape measurements.
Due Date Calculator
Your due date from a period, conception date or scan.
P-value Calculator
P-values from a z, t, chi-square or F statistic.
Bulk Image Compressor
Compress a whole folder of images and get one ZIP back.
Longest Sentence Finder
Find the sentences that are costing you readers.
Event Schema Generator
Dates, venue, tickets and status as Event JSON-LD.
XML Sitemap Generator
Turn a list of URLs into a search-engine-ready sitemap.xml.
Keyword Density Checker
Find the words and phrases your copy actually leans on.
Ad Description Generator AI
Ad description lines with character counts, AI or instant.
A/B Test Significance Calculator
Compare two variants and see whether the difference is conclusive.
Invoice PNG to PDF
Turn PNG screenshots and scans of invoices into a single, tidy PDF.
Invoice to PDF
Turn invoice data — JSON, XML, UBL or CSV — into a printable PDF invoice.
Invoice to JSON
Turn an invoice of any kind into clean, typed JSON.
Invoice PDF to JSON
Convert invoice PDFs into structured JSON for an API, a database or a pipeline.
Invoice OCR to CSV
Read scanned invoices into CSV rows your accounting system can import.
Invoice XML Validator
Find the exact line and column where invoice XML breaks, then check what it says.
Invoice Overdue Stamp Generator
Mark an invoice as past due so it cannot be mistaken for the original.
Invoice Paid Stamp Generator
Mark an invoice as settled so nobody pays it twice.
Invoice Footer Generator
The legal footer an invoice needs: registered name, number, office and tax ID.
Invoice Reference Number Generator
A payment reference with a check digit — RF creditor, Finnish, Norwegian KID or mod-10.
Invoice Generator with Stripe
An invoice with a Stripe Payment Link that carries the invoice number back to you.
Invoice Payment Tracker
Match payments against invoices, including the lump sums that cover several.
Invoice Discount Calculator
Work out a discount, what it costs you, and whether the customer should take it.
Invoice in SAR
Bill in riyals with 15% VAT, a VAT number, Arabic text and a ZATCA QR.
Invoice in GBP
Bill in sterling with 20% VAT, a sort code and Faster Payments.
Web Safe Colors Chart
The 216 web-safe colours, and why they no longer matter.
Duotone Color Generator
Build a duotone pair and get the CSS to apply it.
HWB Color Converter
Convert to and from HWB, the hue-whiteness-blackness notation.
Wire Gauge Converter
AWG and SWG to mm², diameter, circular mils and resistance per length.
JPG to GIF Converter
Turn a photo into a GIF, with the palette built from the image itself.
MP3 to WAV Converter
Uncompress an MP3 to WAV for editing — 16 or 24 bit, any sample rate.
XML to YAML Converter
Old XML config into readable YAML, with attributes and repeated tags handled properly.
EditorConfig Generator
Make every editor agree on indentation, line endings and charset.
Marriage Tax Calculator
Whether marrying costs you tax or saves you tax.
Future Value Calculator
What money today grows into, with or without contributions.
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