Is Ozydo really free?

Yes. Ozydo's free plan lets you create 5 invoices and 3 estimates every month at zero cost, forever. No credit card is required. The Pro plan (₹199/month) removes the monthly limits and adds unlimited invoices, premium PDF templates, GSTR-1 export, and priority support.

How do I create a GST invoice for free in India?

Sign up free at ozydo.com, add your GSTIN in settings, create a new invoice, add your client and line items, choose the GST rate (5%, 12%, 18%, or 28%), and tap Send. The PDF invoice is generated instantly with CGST/SGST or IGST calculated automatically. Share via WhatsApp or email.

What is the mandatory format for a GST invoice in India?

A valid GST tax invoice must include: supplier name, address, and GSTIN; unique sequential invoice number; invoice date; recipient name, address, and GSTIN (for B2B); HSN/SAC code; description of goods or services; taxable value; GST rate; CGST and SGST or IGST amounts separately; place of supply; and total value in words and figures.

Can I send a GST invoice on WhatsApp?

Yes. Ozydo generates a professional GST invoice PDF and lets you share it directly on WhatsApp with one tap — without downloading and re-uploading the file. This is the fastest way to send invoices to clients in India.

What is the difference between CGST, SGST, and IGST?

CGST (Central GST) and SGST (State GST) apply to intra-state sales — within the same state. They are each half of the total GST rate (e.g., 18% GST = 9% CGST + 9% SGST). IGST (Integrated GST) applies to inter-state sales — between two different states — and equals the full rate.

Do freelancers need to charge GST on invoices?

Only if your annual service income exceeds ₹20 lakh (₹10 lakh in some North-East states). Below this threshold, you do not need to register for GST and can invoice without charging GST. Above the threshold, GST registration is mandatory and you must charge 18% GST on most services.

What is the best free invoice app for small businesses in India?

Ozydo is designed specifically for Indian small businesses — it creates GST-compliant invoices in 30 seconds, shares them via WhatsApp, adds a UPI QR code for instant payment, and supports Hindi language. The free plan includes 5 invoices/month with no credit card required.

How do I collect payment via UPI on an invoice?

Add your UPI ID (e.g., yourname@okaxis) in your Ozydo business settings. Every invoice you create will automatically include a UPI QR code and direct payment links for GPay, PhonePe, and Paytm. Clients scan the QR or tap the link to pay instantly.

Free Tool · No Sign-up

GST Invoice Number Generator

Generate sequential, GST-compliant invoice numbers in bulk. Pick your prefix, financial year, and format. Copy all with one click.

Prefix

Financial Year

Starting Number

How many to generate?(1–20)

Format

INV/2025-26/001 (slash-separated)INV-2025-26-001 (dash-separated)INV2526001 (compact no separator)

Generated Numbers (5)

Preview

INV/2025-26/001

INV/2025-26/002

INV/2025-26/003

INV/2025-26/004

INV/2025-26/005

GST Invoice Number Rules

• Must be sequential and unique within a financial year
• Cannot exceed 16 characters (alphanumeric + /, -, _)
• Numbers reset at the start of each financial year (April 1)
• Same series must be maintained across all your invoices

GST Invoice Numbering Rules in India

As per Rule 46 of CGST Rules 2017, every GST invoice must have a consecutive serial number, not exceeding 16 characters, in one or multiple series. The numbering must be unique within a financial year.

Sequential

Invoice numbers must follow a logical sequence — you cannot skip numbers or issue the same number twice.

Max 16 Characters

The full invoice number (including prefix, year, separators, and serial) cannot exceed 16 alphanumeric characters.

New Year = Reset

Your invoice series resets every April 1. You can start from 001 again at the beginning of each financial year.

Let Ozydo handle invoice numbering automatically

Ozydo auto-assigns sequential invoice numbers in your chosen format, resets them at the start of each financial year, and ensures you never duplicate a number. Free forever.

Start Free GST Invoicing →