Mail merge for QuickBooks, Stripe & Excel
Turn your QuickBooks or Stripe data into a personalized Word document for every customer.
Connect QuickBooks Online or Stripe (read-only), or upload an Excel file. Add a Word template with merge fields. MergeNinja fills it in for every customer (dunning letters, year-end statements, receipts, renewal notices) and emails you the finished batch.
7 days free · no card to start
Synced invoices
Dear Acme Landscaping,
Our records show an open balance of $1,240.00, now 45 days past due…
× 200 customers, one click
How it works
Three steps the first time. One click every time after.
- 1
Connect your data
Connect QuickBooks Online or Stripe with read-only access, or upload an Excel file. No exports, no CSV cleanup.
- 2
Upload a Word template
Bring your own .docx with merge fields: your fonts, your logo, your layout. If you can use Word, you already know how.
- 3
Sync, filter, merge
Sync your live data, filter it (say, open + past due), and merge. Finished documents arrive by email, ready to send or print.
The documents your customers actually expect
Pick the letter, statement, or notice. MergeNinja fills it in for every customer from your live data.
Dunning & past-due letters
Every open invoice, days-overdue computed, merged into a firm-but-friendly letter, batch-generated in one click.
QuickBooks Online StripeYear-end statements
One statement per customer, totals and payment history filled in, for your whole customer list, in minutes.
QuickBooks Online StripePayment receipts
Branded, printable receipts from your Stripe charges, not a plain-text email.
StripeRenewal notices
Renewal date, plan, and amount pulled straight from your Stripe subscriptions.
StripeCustomer letters & labels
Any Word letter, personalized for every customer in QuickBooks or Excel.
QuickBooks Online ExcelThe statement run, without the afternoon.
You know the routine. Export, clean up, wrestle Word's merge wizard, and repeat it every single month.
The old way, every month
- 1
Export CSV - 2
Fix columns - 3
Fight the merge wizard
…then do it all again next month, with a stale export.
With MergeNinja
- 1 Connect
- 2 Pick template
- 3 Merge
Set up once. The second run is one click.
ChatGPT writes a letter. MergeNinja writes it for all 200 customers, with the right names, amounts, and days overdue.
Who uses MergeNinja
Anyone whose customers expect documents, not just emails.
Bookkeepers & firms
The monthly statement run for all your clients, done in minutes.
See how →Contractors & home services
Past-due letters for every slow payer, out before Friday.
See how →Gyms & memberships
Renewal notices for everyone whose term ends next month.
See how →SaaS & subscriptions
Branded receipts your bigger customers keep asking for.
See how →Landlords & property managers
A firm-but-friendly notice for every late rent, all at once.
See how →Agencies & professional services
Month-end statements for every retainer client, from live data.
See how →Trusted by bookkeepers and small businesses.
Read-only connections: we can see your data, never change it.
Read-only & encrypted
We can see your data, never change it. OAuth tokens are encrypted at rest, and disconnecting revokes access at QuickBooks and Stripe too.
Security details →Your own .docx, your formatting
It's your Word template: fonts, logo, and layout stay exactly as you built them. We only fill the merge fields.
Compare with manual merges →Set up once, re-run monthly
Your template stays put and the data refreshes itself. The second run, and every run after, is one click.
One plan. Every document type.
No tiers to decode. $45 a month for unlimited merges across QuickBooks, Stripe, and Excel, and one recovered overdue invoice typically covers a year.
Full pricing details →MergeNinja Standard
$45 / month
- 7-day free trial: no card to start
- Unlimited mail merges
- QuickBooks Online, Stripe, and Excel data sources
- All document types: letters, statements, receipts, notices
7 days free · no card to start
Stop exporting. Start merging.
Connect your data, upload your Word template, and send every customer document in one click.
7 days free · no card to start