Easy-to-Use Invoicing Software A complete and intuitive solution for your business management

Flexina is the most comprehensive electronic invoicing and business management software in Belgium. Designed to meet the needs of SMEs and freelancers, it offers an all-in-one solution including invoicing, scheduling, CRM, e-signature, and much more.

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An intuitive and powerful solution to manage your invoicing effortlessly.

Flexina: The Best Online Invoicing Software with Peppol

Ideal for freelancers and SMEs, our software optimizes your daily management with a modern and ergonomic interface. Flexina is designed to meet Peppol electronic invoicing requirements.

24/7 Access from Any Device

Invoice online with complete freedom, supporting multiple languages and currencies.

Maximum Security

Your data is hosted in Europe with regular backups.

Dedicated Customer Support

Enjoy personalized assistance from our team of experts.

The All-in-One, 100% Modular Management Software

Pay only for the features you need with Flexina, the custom management software that adapts to your business.

Flexina online invoicing software interface for Belgium

Complete customization freedom for your quotes and invoices.

Create Unique Quotes and Invoices with Your Own Custom Templates!

With Flexina, design professional business documents that reflect your company’s image.

Tailor-Made Design for Your Quotes and Invoices

Customize the layout, colors, and add your logo.

Flexible Terms and Conditions

Easily add and modify clauses on the back of your documents or as an attachment.

Payment QR Code

Integrate an EPC QR code on your invoices, allowing clients to make quick transfers.

Editor for customizable quote and invoice templates with real-time preview

Automated and intelligent cash flow management.

Manage Your Cash Flow in Real-Time

Instantly visualize your financial status and automate client follow-ups.

Real-Time Monitoring

Track your invoices and payments with clear, instant indicators.

Automatic Bank Reconciliation

Access your bank statements to automatically reconcile sales and purchase invoices.

Online Payments

Easily accept online payments via Digiteal, Stripe, or PayPal.

Dashboard for unpaid invoices and customer reminders in Flexina software

A comprehensive dashboard to manage your clients and suppliers.

Optimize Customer Relationships with Flexina CRM

Keep a detailed history of each interaction and strengthen your customer relationships.

Centralized Customer Management

Create complete client records with business history and personalized tracking.

Automated Business Data and VAT Numbers

Instantly import and verify business registry and VAT data via VIES.

Integrated Sales Follow-Up

Organize tasks and sales notes directly in each client record.

Flexina CRM interface with task and client follow-up management

Maximize your company's performance with our comprehensive business management suite.

Boost Your Revenue with Flexina Invoicing

Optimize your financial tracking and make informed decisions with detailed statistics and real-time analysis.

Real-Time Financial Dashboard

Instantly visualize your revenue, with automatic updates for each invoice.

Detailed Business Analytics

Analyze detailed statistics by VAT rate, country, customer categories, and products.

Strategic Business Reporting

Manage your business with clear charts and customized performance indicators.

Real-time sales charts and statistics in Flexina invoicing software

Streamline your entire business cycle with our powerful all-in-one solution.

Flexina Invoicing: Your Complete Business Management Solution, Tailored to Your Needs!

Efficiently manage all your business documents and optimize your workflow.

Centralized Business Documents

Manage your entire business cycle: quotes, orders, deliveries, and invoices in an integrated workflow.

Automatic Document Conversion

Convert your quotes into orders and then into invoices without re-entering data, with customized status tracking.

Business Tracking and Statistics

Analyze your business performance and customer tracking with detailed indicators.

Automatic conversion of quotes into invoices in Flexina business management software

Secure and accelerate the electronic signing of your quotes and purchase orders with our certified legal solution.

Electronic Signature for Quotes and Purchase Orders

Our electronic signature solution allows instant validation of your quotes and orders, fully compliant with legal requirements.

Legally Compliant Electronic Signature

Legally sign your quotes and orders with our secure electronic signature solution.

Real-Time Signature Tracking

Automate the electronic signing process with instant notifications.

Simplified Quote Validation

Quickly obtain the electronic signature of your quotes and convert them into orders.

Electronic signature for quotes and purchase orders with real-time tracking

Centralize scheduling, tasks, and invoicing in a single interface tailored to all industries.

Integrated Business Scheduling in Your Commercial Management

Manage your business with a professional schedule connected to your administrative and commercial management.

Multi-Activity Scheduling

Manage interventions, projects, and tasks linked directly to your client records.

Integrated Management

Automatically connect your schedule to quotes, orders, and invoices.

Collaborative Planning

Coordinate teams and track task progress in real-time.

Flexina business scheduling integrated with commercial management and invoicing

Prepare for the legal requirement of Peppol electronic invoicing in Belgium and get your business ready today.

Mandatory in 2026: Adopt Peppol Electronic Invoicing

Peppol electronic invoicing will become mandatory for all Belgian businesses by January 2026. Flexina helps you transition smoothly.

Complete Peppol Invoicing

Send and receive Peppol electronic invoices compliant with the upcoming 2026 regulation.

Guaranteed Compliance

Certified by SPF Bosa, fully aligned with Peppol standards for B2B and B2G transactions in Belgium.

Seamless Transition

Start preparing now for the mandatory switch to Peppol electronic invoicing in 2026.

Peppol: Invoice sent and received electronically in compliance with Belgian regulations

Smart modules that simplify your operations: PrestaShop import, AI-powered invoice scanning, electronic signature, and more.

Flexina: Practical Innovations for Your Daily Business Management

Developed over 15 years with our clients, Flexina integrates your needs into time-saving features.

PrestaShop Import to Peppol

Automatically import your PrestaShop orders and convert them into Peppol electronic invoices in one click.

AI-Powered Invoice Scanning

Digitize supplier invoices with our AI module that extracts data automatically.

Integrated and Connected Modules

CRM, scheduling, electronic signature for quotes—all your business tools centralized in one interface.

Innovative Flexina modules: PrestaShop, AI scanning, electronic signature, scheduling, and CRM

Flexina: Everything You Need to Know About Electronic Invoicing and Quotation & Invoice Software

Find answers to frequently asked questions about Flexina, the mandatory electronic invoicing in Belgium from 2026, electronic signature for quotes and purchase orders, and the pitfalls of free invoicing software. A must-read resource for freelancers and small businesses looking for a reliable and compliant invoicing solution.

Flexina: More Than Just an Online Invoicing Software

What is Flexina, and why choose it as your online invoicing software?

Flexina is an online invoicing and quotation software designed to simplify business management for freelancers, small businesses, and SMEs. Unlike other solutions, Flexina does not require a subscription and offers a modular approach, allowing you to customize your software according to your needs without unnecessary costs.

Which invoicing software should a small business in Belgium choose?

The choice of invoicing software depends on your needs. Flexina is ideal for freelancers and small businesses in Belgium thanks to its ease of use, comprehensive management of quotes and invoices, and compliance with Peppol electronic invoicing regulations in Belgium and Europe.

Is Flexina an invoicing software for Mac?

Yes, Flexina is an online invoicing software accessible from any device, including Mac, with no installation required. It works on all modern browsers, allowing you to manage your invoicing from anywhere.

Is invoicing software mandatory in Belgium?

With the digitization of invoicing in Belgium and the obligation for electronic invoicing starting in 2026, it is essential to use compliant invoicing software. Flexina meets Peppol electronic invoicing requirements and ensures a smooth transition to the new regulations.

Is Flexina an electronic invoicing software for Belgium?

Yes, Flexina is an electronic invoicing software designed to comply with legal requirements in Belgium. It enables the issuance and reception of electronic invoices that adhere to Peppol and UBL 3Bis standards, ensuring full compliance with current legislation.

Is Flexina a quotation and invoicing software for the construction industry?

Yes, Flexina is a quotation and invoicing software tailored for construction professionals. It allows you to manage deposits, apply specific VAT rates, and include detailed line items. You can also track project progress with our intervention management module.

Does Flexina allow managing purchase invoices?

Yes, with Flexina, you can manage your purchase invoices using our AI-powered scanning system. It enables the automatic import of supplier invoices in XML Peppol format, making accounting registration and processing easier and error-free.

Can Flexina export invoices to accounting software?

Yes, Flexina allows accounting export of invoices in UBL Peppol 3Bis or UBL.be format, complying with new accounting obligations in Belgium. Accounting software must now be able to import sales and purchase invoices in UBL format. Flexina ensures seamless integration with your accounting.

Does Flexina offer invoicing and inventory management software?

Yes, Flexina includes advanced inventory management. You can track stock levels in real time, link products to invoices, and automate quantity tracking, preventing stock shortages and management errors.

What additional modules are available on Flexina?

Flexina offers several additional modules, including intervention management, CRM, Prestashop integration, team scheduling, and electronic signatures. These modules allow you to tailor Flexina to your business in an optimal and cost-effective way.

Are Flexina's modules charged per user?

No, at Flexina, each additional module is charged only once for the entire company, unlike other software that imposes user-based costs.

Can I add a module later if my business grows?

Yes, Flexina is designed to grow with your business. You can add additional modules anytime, without recurring costs, and only as needed.

Electronic Signature for Quotes and Purchase Orders with Flexina

Why use electronic signatures for quotes and purchase orders?

Electronic signatures allow your clients to quickly validate their quotes and purchase orders online, without printing or traveling. This speeds up the sales process and reduces the risk of errors or disputes.

Are electronic signatures legal in Europe?

Yes, simple electronic signatures are legal in Europe and recognized under the eIDAS regulation. They are sufficient for most commercial transactions, including quote and purchase order validation.

Does Flexina integrate an electronic signature solution?

Yes, electronic signatures are directly integrated into Flexina, allowing you to send quotes for signing in just a few clicks, without needing an external service.

What are the advantages of electronic signatures with Flexina?

With Flexina, electronic signatures allow:
- Quick and legally valid validation of quotes and purchase orders
- The ability to request a deposit directly at the time of signing
- Automatic integration with invoicing
- A much lower cost than external electronic signature solutions

Why is Flexina more affordable than other electronic signature solutions?

Unlike dedicated platforms that charge per signature or require a monthly subscription, Flexina integrates electronic signatures at no significant extra cost, making it an affordable and effective solution.

Can I request a deposit on a signed quote with Flexina?

Yes, Flexina allows you to include a deposit request directly on the signed quote. Once validated by the client, they can immediately pay the deposit via SEPA QR code, PayPal, or Stripe, from their smartphone or computer. This process speeds up sales and improves customer experience.

Can I attach documents to a quote or purchase order for signing?

Yes, with Flexina, you can attach additional documents such as attestations, contracts, or general terms directly to the quote or purchase order, ensuring complete transparency with your clients.

Beware of Free Invoicing Software: Hidden Costs and Limitations

Why use invoicing and quotation software?

Invoicing and quotation software simplifies your business management by automating document creation, payment tracking, and legal compliance. It also helps you stay organized and productive while reducing errors and disputes with clients.

What is the best invoicing software in Belgium?

Flexina is Belgian invoicing software designed to meet businesses' legal obligations in Belgium. It offers accounting export, Peppol electronic invoicing, and simplified quote and invoice management, ensuring compliance and peace of mind for your business.

Is free invoicing and quotation software enough?

No, most free invoicing and quotation software has significant limitations in features and invoice volume. They may not support accounting export, payment management, or Peppol electronic invoicing, which will be mandatory in Belgium in 2026. Flexina offers a complete and affordable solution, avoiding surprises and ensuring a professional, compliant service.

Does free electronic invoicing software exist?

No, that's a scam! Peppol electronic invoicing involves costs for sending and receiving invoices, making it impossible to offer this service for free. Many 'free' offers hide unexpected fees, restrictive limitations, or dubious commercial practices. It's best to use transparent software like Flexina, which avoids unpleasant surprises and ensures a reliable, legally compliant service.

See for yourself the ease of online invoicing
and the quality of our customer service

Try Flexina Invoicing for free for 15 days without obligation

Free trial

You can also contact us to get a free demonstration with a Flexina Invoicing advisor.

Flexina Invoicing makes your online invoicing easy on iPhone, iPad and Android.

Invoicing software on iPhone, iPad, Android.

Customer testimonials

For more than 10 years, we have been providing quality professional service in dozens of countries.

TWOSEVEN SRL - SECURITY, NETWORK & ELECTRICAL

Faithful to FLEXINA since always, a real pleasure and a very efficient tool on a daily basis. We had tried many different invoicing software and none of them offered such latitude in settings and customizations. You can also count on an extremely efficient and responsive technical service, which makes each handling very smooth. A must have for all freelancers and companies who want an all-in-one tool without any hassle. Thanks to the whole team!

Lionel Delsart - Belgium

Led Tech Pro SARL.

I have been using Flexina for 13 years, it is an excellent invoicing software which is complete (quote, order form, delivery note, invoice, etc.). It is easy to use, with its application and the Cloud, it allows access to documents from anywhere and with any device. Regular updates whose payment with QR code is very practical. I highly recommend this invoicing solution.

Ugo Genestout – Switzerland

PRINTING IXTHUS

I take this digital pen to say that I find that Flexina is a company that fights hard to satisfy us, what's more, with an excellent team behind, available, at the listen, and above all reactive! Nothing to complain about, I use Flexina every day, even on weekends, and it works great! 100% recommended.

Guillaume LEDUC – France

SCHALLER SARL

Since using Flexina, my life has changed. Everything is easier, they update very regularly. They always answer the phone, they are really super responsive! Thank you

Albane SCHALLER - Luxembourg

PASTITALIA SARL

I was looking for a program online, I found flexina which solved all my problems, simple and fast and the support always available, I highly recommend it in Switzerland.

Sergio Scalirò – Switzerland

SERRURERIE LAMARCK

We have been using Flexina to make our invoices and quotes for several years now, it is a really complete and easy-to-use invoicing software. We are very satisfied with the service and the human contact with the members of the Flexina team, who are always available to advise us.

Guillaume LEDUC – France

OPTIBELUX S.A.

I've been using Flexina since 2016, the software is super simple and very practical. Good luck to the whole team.

Jonathan Flasschoen – Luxembourg

Casa&Co SA

We have been using Flexina for years. Very easy to use and very easy to handle. We recommend it.

CENGIZ GURSOY – Switzerland

SAS ECHO-VERT PYRENEES OCEAN

Flexina, top-of-the-line software suitable for SMEs on computers and smartphones. simple software meets business needs

Katia Goursaud – France

The online invoicing software Flexina Invoicing is ready for the electronic invoicing

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