FlexinaTools: 46 free tools that never leave your browser
FlexinaTools is a collection of 46 free online utilities built by Flexina, a Belgian company that develops management and e-invoicing software for the self-employed and small businesses. Every tool runs entirely in your browser: nothing you type or upload is ever sent to a server, so invoices, payslips and contracts stay on your device.
The tools are organised into four universes:
- For business (18 tools) — e-invoicing validators and generators (Peppol BIS 3.0, Factur-X/ZUGFeRD, UBL viewer, PDF invoice with EPC payment QR), IDs and payments (IBAN, BCE/SIREN/SIRET, EU VAT, Belgian structured communication, SEPA QR), and calculators for VAT, margins, loans, rent indexation, percentages, due dates, business days and gross/net salaries in Belgium and France.
- Documents (11 tools) — merge, split, compress and convert PDFs, turn PDFs into images or Word, convert Word to PDF, plus image resizing, compression, format conversion, EXIF removal and favicon generation.
- Home & projects (5 tools) — electricity consumption, paint, tiling, rooftop insulation and a general unit converter.
- Tech (12 tools) — JSON, XML, Base64, JWT, UUID, SHA-256/512, text diff, regex tester, cron parser, word counter, password generator and QR-code generator.
Why it stands out
- 100% local — no file or data is sent to a server; the tools keep working offline.
- No account, no upload — open a tool and use it immediately.
- Built from real practice — each tool reuses rules and algorithms Flexina applies daily for clients in Belgium and France.
- Regularly updated — new tools and fixes are added as field needs evolve.
FlexinaTools is the free, everyday counterpart to Flexina's paid ecosystem (Flexina management platform, Peppol Box, France Factures, Flexina Field). It is a practical, privacy-first toolbox for freelancers, small businesses and anyone who needs quick, reliable utilities.