BillZap
The whole shop on one screen
Revenue, what is still unpaid, what is running low and what you took today — without opening four different places to find out.
See every stageFree forever · No sign-up
GST bills in 30 seconds, even with no signal
BillZap is a free GST billing app built for Indian shops. Make a proper tax invoice at the counter, put a UPI QR on it so the customer pays before they leave, and send it on WhatsApp — all without internet.
- Works offline
- Data stays on your phone
- No subscription
- 12 Indian languages
Say it in your language and the invoice fills itself in
See all 12 languagesExample of voice billing: you say “do kilo chini” and BillZap writes Sugar, 2 kg, HSN 1701, ₹96.00 plus ₹4.80 GST at 5%.
Everything below is in the free app
- Offline invoices
- UPI QR on every bill
- Voice billing
- GSTR-1 export
- HSN codes
- PDF to WhatsApp
- Day close
- Stock alerts
- Customer dues
- PIN lock
30sTo a finished GST bill
100%Works without internet
12Indian languages
₹0Forever. No trial, no tier
In one paragraph
What is BillZap?
BillZap is a free GST billing and invoicing app for Android, made for small shops and traders in India. It makes GST-compliant tax invoices with HSN codes and an automatic CGST, SGST or IGST split, prints a UPI QR code so the customer can pay on the spot, and shares the bill as a PDF on WhatsApp. It works fully offline, needs no sign-up, keeps every record on the phone, and comes in 12 Indian languages.
Updated 16 October 2026
- Price
- Free. No paid tier, no trial, no invoice limit
- Platform
- Android 7.0 and above · about 32 MB
- Internet
- Not needed — every bill is made and kept offline
- Sign-up
- None. No account, phone number or email
- GST
- 0, 5, 12, 18, 28 and 40% per item; CGST + SGST or IGST by place of supply
- Payments
- UPI QR on every unpaid bill; money goes straight to your bank
- Exports
- PDF invoices; GSTR-1 summary, profit and loss and reports as PDF or CSV
- Languages
- English, Hindi, Tamil, Telugu, Kannada, Malayalam, Marathi, Gujarati, Bengali, Punjabi, Odia and Urdu
- Your data
- Stored on your phone; the backup is a file you keep
Built for the counter
Most billing apps were not made for a shop
They ask you to sign up, then to subscribe, then to be online. Meanwhile there is a customer in front of you holding cash.
No signal? Keep billing
Every bill is saved on the phone the moment you make it. A basement shop, a market stall or a power cut changes nothing — there is no server to reach and nothing waiting to sync.
Where your data livesOne app, no add-ons
One app for every stage of the sale
From setting the shop up to handing your accountant the year — without paying for a single extra module.
Set up
Your shop, once
Name, GSTIN and UPI ID. Every bill afterwards carries them.
Your catalogue
What you sell, saved with its HSN code and GST rate.
- Works from the first launch, with no internet
- No account, no phone number, no email
- The whole app in 12 Indian languages
- GST rate suggested from the item name
Billing
Tax invoices that hold up
Per-item GST, worked out and shown as you add lines.
Bill by speaking
Say the item and the amount in your own language.
- Place of supply decides CGST + SGST against IGST
- 0%, 5%, 12%, 18%, 28% and 40% per item
- HSN and SAC codes printed on every line
- Discounts and delivery, applied before tax
Getting paid
UPI QR on the bill
The customer scans and pays before leaving the shop.
Dues, oldest first
Every buyer's balance, sorted by what is most overdue.
- A clean PDF to WhatsApp in two taps
- Ageing buckets — 0–30, 31–60, 61–90, 90+ days
- Paid, sent, pending and overdue at a glance
- Print to a WiFi or Bluetooth printer
The numbers
Reports your accountant wants
Revenue, GST collected and profit, month by month.
Day close
Cash in, UPI in, expenses out, and what the drawer should hold.
- GSTR-1 summary as PDF or CSV
- Profit and loss on a cash basis
- Your biggest customers, ranked
- Indian digit grouping — ₹12,34,567, never ₹1,234,567
How it works
How to make a GST bill in 30 seconds
Five moments, from an empty phone to a paid, shared, filed bill. Press any step to watch it again.
- 0:00
Shop name, GSTIN and UPI ID — about a minute, with no account, OTP or email. Every bill after that carries them.
- 0:06
Pick from your catalogue, or say it in your own language. The HSN code and GST rate come from the item.
- 0:14
Same state as your shop: CGST + SGST. Another state: IGST. The place of supply decides, and the bill shows its working.
- 0:20
A UPI QR on the bill. The customer scans it with any UPI app and the money goes straight to your bank.
- 0:26
A clean PDF to WhatsApp in two taps. The sale lands in your reports and your GSTR-1 summary by itself.
Billing
A tax invoice you would be happy to hand over
The bill is laid out like a document, not a database screen: your shop at the top, the buyer's GSTIN, every line with its HSN code and rate, and the tax split spelled out underneath.
- Per-item GST — 0%, 5%, 12%, 18%, 28% and 40%
- Place of supply decides CGST + SGST against IGST
- Discounts and delivery charges, applied before tax
- Your bank details and UPI QR printed on the bill
Getting paid
Know exactly who still owes you
Every bill is colour-coded the moment its due date passes. The ledger sorts by what is most overdue, so the call you make is the one worth making.
- Paid, sent, pending and overdue at a glance
- Ageing buckets — 0–30, 31–60, 61–90, 90+ days
- A WhatsApp reminder with the UPI link attached
- Search by customer, number or amount
Numbers
What you earned, what you owe, what is left
Revenue by month, GST collected split into CGST, SGST and IGST, and profit after expenses. Export any of it as a clean PDF or a CSV your accountant can open.
- Month-by-month GST breakdown for GSTR-1
- Profit and loss on a cash basis
- Your biggest customers, ranked
- Indian digit grouping — ₹12,34,567, never ₹1,234,567
Compliance
GST handled properly, not approximately
Getting the tax wrong means reissuing the bill. BillZap does the parts that are easy to get wrong, and shows its working.
The right tax, automatically
Same state as your shop and it charges CGST + SGST. Different state and it switches to IGST. The invoice screen tells you which one it has chosen and why, so a wrong place of supply cannot slip past you.
Ready for GSTR-1
A month-by-month summary of taxable value, CGST, SGST and IGST, exportable as PDF or CSV. It is supporting data for your filing, laid out the way your accountant reads it.
HSN and SAC on every line
Save the code once against the item in your catalogue and it prints on every bill that includes it, with the GST rate suggested from the item name.
Print or share
Send the PDF on WhatsApp, or print to a WiFi or Bluetooth printer from the same screen. The rupee symbol renders correctly in both.
Your language
The whole app, in the language you think in
Not just the menus — the voice billing understands them too.
- English
- हिन्दी Hindi
- தமிழ் Tamil
- తెలుగు Telugu
- ಕನ್ನಡ Kannada
- മലയാളം Malayalam
- मराठी Marathi
- ગુજરાતી Gujarati
- বাংলা Bengali
- ਪੰਜਾਬੀ Punjabi
- ଓଡ଼ିଆ Odia
- اردو Urdu
Side by side
What you usually get, and what you get here
| What matters at the counter | Typical billing app | BillZap |
|---|---|---|
| Works with no internet | Needs a connection | Fully offline |
| Invoices per month | Capped on the free plan | Unlimited |
| Cost | Free trial, then monthly | Free, with no paid tier |
| Sign-up required | Account and phone number | None — open and bill |
| Where your data lives | On someone else's server | On your phone |
| Voice billing | Rare, usually English only | 12 Indian languages |
| UPI QR on the invoice | Often a paid add-on | Included |
| GSTR-1 summary export | Usually a higher plan | Included |
Privacy
Your books are nobody else's business
BillZap has no account, no server and no analytics on your invoices. What you bill stays in the app's own storage on your phone. There is nothing for us to read, sell or lose, because nothing is sent anywhere.
Nothing leaves the device
Invoices never leave your phone unless you share them yourself, as a PDF you chose to send.
Locked and backed up
App lock with a PIN or your fingerprint, and a backup file you own — restorable on a new phone in a minute.
GST, explained
What a GST invoice needs, in plain words
The rules BillZap follows for you, so you know what is on your bill and why. Reviewed 16 October 2026.
What must a GST tax invoice include?
Under Rule 46 of the CGST Rules, 2017, a tax invoice shows:
- Your name, address and GSTIN
- A serial number of up to 16 characters, unique for the financial year, and the date of issue
- The buyer's name and address, and their GSTIN if they are registered
- The HSN code for goods or SAC code for services, with the description, quantity and unit
- The taxable value, after any discount
- The rate and amount of CGST and SGST, or of IGST, and of cess where it applies
- The place of supply, with the state's name, when the sale is to another state
- Whether tax is payable on reverse charge, and your signature or digital signature
CGST + SGST or IGST — which one applies?
It depends on where the supply takes place. When your shop and the place of supply are in the same state, the GST rate is split equally into CGST and SGST. When they are in different states, the whole rate is charged as IGST. In a union territory without its own legislature, UTGST takes the place of SGST.
| Sale of ₹3,740 at 18% | Tax charged |
|---|---|
| Buyer in your state | CGST ₹336.60 + SGST ₹336.60 |
| Buyer in another state | IGST ₹673.20 |
The total tax is the same either way; what changes is which government it goes to. BillZap picks the split from the place of supply and shows it on the bill.
How many digits of HSN code do I need?
From 1 April 2021 (Notification 78/2020 – Central Tax), it depends on your aggregate turnover in the previous financial year:
| Previous year's turnover | HSN digits on invoices |
|---|---|
| Up to ₹5 crore | 4 digits on B2B invoices |
| More than ₹5 crore | 6 digits on every invoice |
Services use SAC codes, which begin with 99. In BillZap you save the code once against the item and it prints on every bill.
Which GST rates apply in 2026?
Since 22 September 2025, most goods and services are taxed at 5% or 18%, with 40% for luxury and sin goods and 0% for exempt essentials. A few items keep special rates — gold, for example, is at 3%.
BillZap lets you set 0, 5, 12, 18, 28 or 40% on each item, so the current slabs are there and so are the older ones, for any bill that still needs them. The split into CGST and SGST, or IGST, is worked out from whichever rate you choose.
The GST terms on your bill
- GSTIN
- The 15-character GST Identification Number given to every registered business. The first two digits are the state code and the next ten are the business's PAN.
- HSN code
- Harmonised System of Nomenclature: the code that classifies goods for GST, printed on each line of the invoice.
- SAC code
- Services Accounting Code: the HSN equivalent for services. SAC codes begin with 99.
- CGST and SGST
- Central and State GST, charged together on a sale within one state, each at half the GST rate — 9% + 9% on an 18% item.
- IGST
- Integrated GST, charged at the full rate on a sale from one state to another, and on imports.
- Place of supply
- The state where a supply is treated as made. It decides whether the bill carries CGST + SGST or IGST.
- GSTR-1
- The return of outward supplies — your sales — that a regular GST taxpayer files monthly or quarterly.
- Taxable value
- The value GST is charged on: the price after any discount, before tax.
A plain-language summary to help you read your own invoices, not tax advice. For your own business, check with your CA.
Questions
The things people ask first
Is BillZap really free?
Yes. There is no paid tier, no trial that expires and no cap on how many invoices you can make. The app you install is the whole app.
Does it work without internet?
Completely. Every invoice, customer, product and expense is stored on the phone itself. You can bill all day with the network off and nothing is queued up waiting to sync.
Are the invoices GST compliant?
They carry your GSTIN, the buyer's GSTIN, HSN or SAC codes per line, the GST rate on each item, and the tax split shown separately as CGST and SGST or as IGST. Place of supply decides which split applies, and the app tells you which one it has picked before you save.
Do I need to create an account?
No. There is no sign-up, no phone number and no email. Open the app and start billing. Because there is no account there is also no server holding your books.
Can I send the bill on WhatsApp?
Yes — the invoice becomes a clean PDF with your shop's name on it, shared in two taps. If the bill is unpaid the message includes a UPI payment link as well.
How does the UPI QR work?
Put your UPI ID in settings once. Every unpaid invoice then carries a QR code the customer scans with any UPI app to pay you directly. The money goes straight to your bank; BillZap is not in the middle of the payment.
What is voice billing?
Speak the item and the amount in your own language and the invoice fills itself in, so your hands can stay on the goods. It understands all twelve of the languages the app is translated into.
Can my accountant get what they need?
Yes. Export a month-by-month GST summary laid out for GSTR-1, a profit and loss statement, a revenue report and an invoice status report — as PDF, or as CSV they can open in a spreadsheet.
What happens if I change phones?
Take a backup from settings — it is a single file you keep — and restore it on the new phone. Your invoices, customers, products and expenses come back.
Does BillZap follow the new GST rates from September 2025?
Yes. You set the rate on each item — 0, 5, 12, 18, 28 or 40% — so the current 5%, 18% and 40% slabs are there, and so are 12% and 28% for any bill that still needs them. The CGST and SGST, or IGST, split is worked out from the rate you choose.
How many digits of HSN code does the invoice show?
Whatever you save against the item — 4, 6 or 8 digits. Businesses with turnover up to ₹5 crore in the previous year need at least 4 digits on B2B invoices; above ₹5 crore, 6 digits on every invoice.
Can I print the bill?
Yes — print to a WiFi or Bluetooth printer from the invoice screen, or share the PDF and print it from any other device.
Is BillZap available on iPhone or a computer?
BillZap is an Android app, for Android 7.0 and above. The invoices it makes are ordinary PDFs, so your customers and your accountant can open them on any phone or computer.
Which Android versions are supported?
Android 7.0 (Nougat) and above. Install it from Google Play; the download is about 32 MB.
Free download
Start billing in the next five minutes
Free to download, free to use, and it keeps working when the network does not. No account, no card, no trial running out.
Android 7.0 and above · about 32 MB · works offline from the first launch