Automate Invoice Generation via API
Generate professional PDF invoices automatically from Excel or Word templates. Scale to thousands of invoices per month without manual intervention.
# Generate invoice PDF from Excel template
curl -X POST \
https://api.convertfilefast.com/v1/convert \
-H "X-API-Key: your_api_key" \
-F "file=@invoice_template.xlsx" \
-o invoice_001.pdf
# HTTP 200 OK — Invoice PDF generated in <2sAdvantages
Why use our API?
Complete and reliable solution for integration in any tech stack.
Template-based generation
Create your invoice template in Excel or Word and send it to our API with data to generate professional PDFs automatically.
Massive scale
Generate thousands of invoices per month. Our infrastructure scales automatically with your billing volume.
Formatting preserved
Logo, colors, fonts and layout of your invoice template are perfectly preserved in every generated PDF.
Simple integration
Integrate invoice generation into your ERP, CRM or billing system in under 30 minutes with any programming language.
Fast processing
Each invoice generated in under 2 seconds. Perfect for real-time billing flows.
Security and privacy
Invoice data processed in memory and immediately discarded. No permanent storage of sensitive data.
FAQ
Frequently Asked Questions
Which file formats can I use as invoice templates?
You can use Excel (.xlsx, .xls) and Word (.docx, .doc) files as invoice templates. The API preserves all formatting, including logos, fonts, colors, and table layouts when converting to PDF.
How long does it take to generate a PDF invoice?
Each invoice is generated in under 2 seconds. The API is optimized for real-time billing flows, so you can generate and deliver invoices to customers instantly during checkout or payment confirmation.
Is there a limit on how many invoices I can generate per month?
The free plan includes 10 conversions per month. The Pro plan supports up to 10,000 conversions per month, and the Scale plan supports up to 50,000 conversions per month. Enterprise plans with unlimited volume are available on request.
Is my invoice data secure and private?
Yes. All files are processed in memory and immediately discarded after conversion. No invoice data or sensitive customer information is permanently stored on our servers. All API connections use HTTPS encryption.
Automate your invoice generation
Create your free account and start generating PDF invoices automatically via API. No credit card, 10 free conversions to start.
No credit card. 10 free conversions on Free plan.