Built by Assemblysoft, SendInvoice is a cloud-native SaaS platform enabling freelancers and businesses worldwide to create, send, and manage professional invoices in seconds — with 150+ currencies, 7 languages, and one-click payment links.
SendInvoice is a professional invoice generator built by Assemblysoft, designed for freelancers, trades, and small businesses who need to look professional and get paid faster.
The platform is entirely browser-based — no downloads, no installs. Built on .NET Blazor and deployed on Microsoft Azure, it offers enterprise-grade reliability with a simple, intuitive user experience.
From a standard invoice to a VAT tax invoice, credit note, or purchase order — SendInvoice handles 11 different business document types, all with beautiful, designer-quality templates and integrated payment links.
Clear, practical tools designed for busy professionals
Beautifully designed invoice templates created by professional graphic designers. Customise with your logo, brand colours, and company details to stand out from the competition.
Accept card payments, PayPal, Stripe, and bank transfers directly from the invoice. Clients can pay in seconds — funds settle to your account within 1–2 business days.
Send invoices in English, Spanish, French, German, Portuguese, Dutch, and Polish. Switch languages per invoice with automatic content updates — perfect for international clients.
Invoice clients in their local currency with automatic symbol and decimal formatting. Supports GBP, USD, EUR, JPY, and 150+ additional currencies worldwide.
Automatically calculate VAT rates, tax IDs, and line-item totals. Supports complex tax structures for different countries and business types — no manual maths required.
Convert accepted quotes to invoices in one click — no retyping, no copy-pasting. Streamline your entire workflow from initial estimate through to final payment.
Download professional PDF invoices or email them directly to clients. Print hard copies or go fully digital — track opens and payment status from your dashboard.
All invoices are securely stored in the cloud with automatic backups. Access them from any device, anywhere, anytime — even if your computer crashes, your data is safe.
Works on any device in any modern browser. No app downloads, no updates to manage. Fully responsive on desktop, tablet, and mobile — just open a browser and start invoicing.
From invoices to purchase orders — every document your business needs in one platform
Sales billing
Price estimate
Payment proof
Refunds
Procurement
Shipping
Pre-invoice
Cost proposal
Cash sale
US credits
VAT invoice
Cash-only businesses are a thing of the past. SendInvoice embeds payment links directly in every invoice, so clients can pay in seconds — via the method that works best for them. Many users report getting paid 30% faster after switching.
Visa, Mastercard & more
Fast, trusted payments
Secure card processing
Traditional wire payment
Cloud-native infrastructure with automatic backups and encryption at rest
All customer data, documents, and reports are securely saved on a cloud-based platform. Access them from anywhere with an internet connection — no hardware dependency.
If your device crashes, your data is safe. Automatic cloud backups ensure you always have access to every invoice and record you need to keep your business running.
Export invoices as professional PDFs or Excel reports. Track revenue, unpaid invoices, and customer metrics — without manually reviewing records one by one.
Three steps from sign-up to getting paid
Choose from 100+ professionally designed templates. Add your logo, brand colours, and company details. Customise every line item, add taxes or discounts — done in under 3 minutes.
Email as a PDF, share a secure payment link, or print a hard copy. Choose the delivery method that suits you and your client. Track opens and views from your dashboard.
Clients pay via card, PayPal, Stripe, or bank transfer. Payment status updates instantly — no chasing, no confusion. All records safely stored for your accounts.
SendInvoice was designed from day one to serve businesses across borders. With 7 supported languages and 150+ currencies, you can send professional invoices to clients anywhere in the world — each invoice automatically adapting to the correct language, currency symbol, and decimal formatting.
Leveraging Assemblysoft's deep expertise in cloud-native .NET development
Create professional invoices in seconds. Free preview available — no credit card required to start. Built by Assemblysoft and trusted by freelancers & businesses worldwide.
A product built by Assemblysoft Ltd — your trusted custom software development partner. ← Back to Case Studies