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Dev tools · August 26, 2026

FlexinaTools

46 free tools that run 100% in your browser

What it does

46 free online tools that run 100% in your browser: merge or compress PDFs, validate Peppol BIS 3.0 e-invoices, convert gross/net VAT for 7 EU countries, resize images, decode JWTs. No upload, no account, no usage limits — and the whole interface comes in 6 languages. Built by Flexina, a small studio in Liège, Belgium. Everything runs client-side: your files never leave your device. Try one tool and tell us what we should build next.

46 free online tools for invoices, VAT, IBAN, PDF and images — no sign-up, no upload. What you enter stays on your device.

Invoicing, PDFs, home projects and developer shortcuts — calculators, validators and converters that run 100% in your browser. Built by Flexina: nothing you type ever leaves your device. Every tool here is the free version of what we build every day for the self-employed and small businesses. For years, Flexina has supported self-employed professionals and small companies: management, e-invoicing, field-team tracking. Through our exchanges with clients, one finding became clear — a large share of their time goes to small, repetitive tasks: calculating VAT, checking an IBAN, preparing an invoice, converting a document. Rather than leave our clients to trust any random website, we built the…from flexinatools.com

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