Quadratic Equation Calculator
Solve ax squared plus bx plus c with roots, discriminant and vertex.
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Duplicate Image Finder
Find duplicates and near-duplicates in a batch of images.
Escape Text
Escape a string for JSON, JavaScript, SQL, shell or regex.
Most Common Word Finder
Find which words a text leans on most.
Nginx Redirect Generator
Build nginx rewrite and return rules from a redirect map.
llms.txt Generator
Write the llms.txt file that tells AI models what your site is.
Page Size Analyzer
Weigh a page's HTML and see what is taking up the room.
Image Alt Text Checker
Find every image with no alt text, or bad alt text.
Twitter Card Generator
Build the twitter:card tags and preview the result.
UTM Link Builder
Tag campaign URLs so analytics can tell your traffic apart.
YouTube Title Generator AI
Click-worthy video titles under 60 characters, AI or instant.
Marketing Budget Calculator
Set a marketing budget from revenue and split it across channels.
Invoice PDF Splitter
Split a PDF of many invoices into one file each — including where each invoice starts.
Invoice Amount Extractor
Pull the total, subtotal, tax and every other amount out of an invoice.
Invoice PDF to CSV
Convert invoice PDFs into CSV rows ready to import into your accounting system.
Invoice Line Item Extractor
Pull the line items out of an invoice — description, quantity, price and total, checked.
Invoice ABN Validator
Check Australian ABNs and ACNs on invoices — the real checksum, in bulk.
Invoice Address Formatter
Format a billing address the way the destination country writes it.
Invoice Barcode Generator
A Code 128 or Code 39 barcode of the invoice number, for scanning and filing.
Invoice Signature Generator
Draw or type a signature and download it as a clean transparent PNG.
Invoice Generator with QR Code
Put a scannable payment QR on the invoice — EPC, UPI, PIX or a link.
Invoice Split Payment Calculator
Split one invoice across several payers, evenly or by share, without losing a penny.
HTML Invoice Template
A self-contained HTML invoice you can edit, style and print — or put in your own app.
Invoice Currency Converter
Convert an invoice at the rate your contract or your bank actually used.
Past Due Invoice Generator
Reissue an overdue invoice with the days late, interest and an OVERDUE stamp.
Debit Invoice
Charge more against an invoice already issued, with the reason recorded.
Plumbing Invoice Generator
Call-out, labour, parts and certification on a plumbing invoice.
Freelance Invoice Generator
Bill by the hour, day or project, with the terms that actually get freelancers paid.
Business Invoice Generator
A company invoice with registration numbers, PO references and bank details.
Color Scale Generator
Interpolate an even scale between two or more colours.
Color to CSS Variables
Turn a palette into CSS custom properties, Tailwind tokens or Sass.
LAB Color Converter
Convert CIELAB to HEX and RGB, and measure ΔE between colours.
Ring Size Converter
US, UK, EU, Japan and India ring sizes, from a measurement or a size you know.
CSV to ICS Converter
Turn a spreadsheet of dates into a calendar file for Google, Outlook or Apple.
Words to Number Converter
Turn "two hundred and forty-five" or "one lakh twenty thousand" back into digits.
EPUB to Text Converter
Read an EPUB as plain text — chapter by chapter, in reading order.
Excel to PDF Converter
A spreadsheet as a clean PDF table, with headers repeating on every page.
PHP Array to JSON Converter
A PHP array literal, var_export or print_r output turned into JSON — nothing executed.
XML to CSV Converter
Find the repeating element in an XML feed or export and turn it into spreadsheet rows.
Markdown Table to CSV Converter
Take a table out of a README or an AI answer and get CSV you can open in Excel.
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