Free tools
Free Tools for Small Business Owners
Updated 27 September 2026 · 4 min read
Running a small business means being your own bookkeeper, designer and office manager — usually in the gaps between serving customers. KitWren gathers the free tools those jobs need: invoices and GST, contracts and signatures, QR codes and product photos. There’s no subscription to cancel, no account, and PDF and image files are processed on your own device, which matters when they’re contracts and customer details.
Open the free Invoice GeneratorGetting paid: invoices and GST
The Invoice Generator creates a clean invoice with your business details, line items and tax, and exports it as a PDF. Add your logo, due date and payment details, and send it the same day you finish the job.
The GST & VAT Calculator adds or removes tax at any rate, with the standard rates of 70 countries built in. The most common mistake it saves you from is taking 10% off a GST-inclusive price — to find the GST in an Australian price you divide by 11, not take 10%.
| Example | Amount |
|---|---|
| Price before GST | $120.00 |
| GST at 10% | $12.00 |
| Price including GST | $132.00 |
| Check: GST inside $132 (÷ 11) | $12.00 |
Rates and rules change, and this is general information rather than tax advice. The GST guide covers tax invoices and registration thresholds in more detail.
Pricing and pay
- Percentage Calculator — discounts, price rises and margins.
- Hourly Wage Calculator — convert between hourly rates and annual pay when pricing your time or hiring.
- Salary Calculator and Income Tax Calculator — estimate take-home pay.
- Loan Calculator — repayments on equipment or vehicle finance.
- Working days calculator — count business days to a deadline.
Contracts and paperwork
- Edit PDF — correct a date, amend a clause or add a note to a supplier’s document.
- Sign PDF — sign agreements and quotes without printing.
- Fill PDF form — complete council, bank and supplier forms.
- Redact PDF — remove bank or personal details before sharing a document.
- Protect PDF — password-protect a document before emailing it.
- Merge PDF and Compress PDF — bundle quotes, plans and attachments into one file that fits in an email.
| Example: end-of-quarter bundle for your accountant | Tool |
|---|---|
| Photograph paper receipts and turn them into a PDF | JPG to PDF |
| Combine them with emailed PDF receipts | Merge PDF |
| Number the pages so queries are easy to reference | Add page numbers |
| Shrink it to email size | Compress PDF |
Marketing and branding
Product and social media images
- Background Remover — put products photographed on a plain background onto white or transparent.
- Image Resizer and Image Cropper — hit the sizes your online store recommends.
- Social Media Image Resizer — presets for Instagram, Facebook, LinkedIn, X, YouTube and Pinterest.
- Image Compressor — keep your website fast.
- Watermark images — add your name or logo text to photos you publish.
- HEIC to JPG — make iPhone photos work on every platform.
Brand basics
- Email Signature Generator — a consistent, professional signature for every email.
- Favicon Generator — the small icon shown in browser tabs for your website.
- Image Colour Picker — find the exact colour codes in your logo so your brand colours match everywhere.
QR codes
The QR Code Generator makes static codes that never expire — for your website, menu, reviews page, Wi-Fi, phone number or a digital contact card. Download SVG for print so the code stays sharp at any size. Popular uses: table cards in cafés, stickers on product packaging, the back of business cards, and a Wi-Fi code for your waiting room.
A 15-minute weekly admin routine
- Send invoices for last week’s finished work with the Invoice Generator.
- Photograph this week’s paper receipts and add them to your running PDF with JPG to PDF and Merge PDF.
- Check which invoices are past their due date and send a polite reminder.
- Post one product photo or update, resized with the Social Media Image Resizer.
Why use KitWren for business admin
- No subscriptions — every tool is free, with no watermarks.
- Private — contracts, invoices and customer documents are processed on your device, not uploaded.
- Nothing to install — works on the shop computer, your laptop or your phone.
Calculators give general estimates. For tax, legal and financial decisions, check with your accountant or the relevant authority.