Tools that keep work moving.
Invoices, QR codes, unit conversions and productivity helpers for teams and founders.
Popular Business tools
QR Code Generator
Create QR codes for URLs, text, Wi-Fi and more.
Password Generator
Generate strong, cryptographically secure passwords with a live strength meter.
Invoice Generator
Create a clean PDF invoice — no signup, no watermark, no upload.
ROI Calculator
Calculate return on investment, net profit and optional annualized ROI.
Random Name Picker
Spin a wheel to pick a random name — fair, fun and free.
Signature Generator
Draw your signature and download it as a transparent PNG.
Markup Calculator
Apply a markup to a cost to get the selling price, profit and margin.
Barcode Generator
Create Code 128, EAN-13, UPC and Code 39 barcodes as PNG.
Break-Even Calculator
Find how many units you must sell to cover costs and the revenue at that point.
Newest
Signature Generator
Draw your signature and download it as a transparent PNG.
Random Name Picker
Spin a wheel to pick a random name — fair, fun and free.
Barcode Generator
Create Code 128, EAN-13, UPC and Code 39 barcodes as PNG.
Invoice Generator
Create a clean PDF invoice — no signup, no watermark, no upload.
Learn about Business
How QR Codes Work: Error Correction, Size and Scanning Tips
What a QR code can hold, how error correction trades size for reliability, and how to print codes that scan first time.
What Makes a Password Strong? Length, Randomness and Entropy
Password strength comes from length and randomness, measured in bits of entropy. How the numbers work, and the habits that keep accounts safe.
How to Calculate Your Break-Even Point (Formula + Example)
The break-even formula, the difference between fixed and variable costs, a worked example, and how to use the number to plan.
How to Calculate Markup and Set a Selling Price
How markup turns a cost into a selling price, why markup is not margin, and a worked example.
How to Calculate ROI and Annualized ROI
The ROI formula, why annualized ROI is the fair way to compare investments, a worked example, and how ROI differs from payback.
Markup vs Margin: The Difference That Costs Businesses Money
Markup and margin use the same two numbers but mean very different things. Confusing them silently erodes your profit — here is how to keep them straight.
How to create a reusable digital signature image
The difference between a signature image, an electronic signature and a legally binding one — and how to draw a clean PNG you can reuse.
How to run a fair name draw in your classroom or giveaway
Why humans are bad at picking winners, what true randomness looks like, and how to run no-repeat draws for classes, raffles and standups.
Barcode formats compared: Code 128 vs EAN-13 vs UPC
Which linear barcode to use for retail, logistics and internal inventory — plus how check digits keep scanners honest.
What belongs on a freelance invoice (and what never does)
The mandatory fields, the tax handling, the numbering scheme, and the pieces of the invoice puzzle that only slow payment down.
Business FAQ
Yes — every tool is free with no account required.
Most tools run entirely in your browser, so once the page loads they keep working without sending your data anywhere.