Why WhatsApp beats every other channel here
Your client already lives on WhatsApp, that's where the order was discussed and where your message gets seen within minutes. Email sits unopened; a PDF attachment needs downloading. A formatted WhatsApp message gets read, and an invoice that's read gets paid. The habits below are what separate "someone with a phone" from a business that looks established.
The 4-step flow
- Fill the invoice. Your business details save automatically after the first one, so repeat invoices take under a minute.
- Enter the client's WhatsApp number in the client field, the tool formats Sri Lankan numbers (0XX → 94XX) for you.
- Tap “Send via WhatsApp”. A chat opens with the full invoice text already typed.
- Add one personal line above it, “Hi Nimal, invoice for the display replacement. Thanks!”, and send.
💬 Send via WhatsApp
⬇ Download PDF
✉️ Send via Email
📱 QR to PC
The share row on every invoice, WhatsApp, PDF, email and QR transfer.
What the client sees
Not a link, not an attachment, a readable message. The total is bold, the amount appears in words (so it can't be quietly edited), and your bank details sit at the bottom ready to copy:
INVOICE INV-2026-0142
From: Kamal Repair Shop
Date: 12/10/2026
• Display replacement ×1, Rs. 8,500.00
Total: Rs. 8,500.00
Rupees Eight Thousand Five Hundred Only
Bank: Commercial Bank | A/C: 1234567890
10:42 ✓✓
Exactly what lands in the client's chat, formatted, complete, no app needed.
Small habits that look professional
- Send in business hours. A 6am invoice feels like a demand; a 10am one feels like business.
- Always include the invoice number , it's how you both find it later. “Invoice 142” beats “that bill from last month”.
- For big clients, attach the PDF too. The message is for speed; the PDF (Download button) is for their records.
- One invoice per message. Don't bundle three jobs into one chat message, it gets confusing fast.