CEZAMThe Toolbox
Every tool, free and without sign-up. Calculations and files stay in your browser.
French calculators
Gross to net salary (France)
Net pay from gross, by status.
Net to gross
The gross to negotiate for a target net.
Employer cost
From gross to fully loaded cost.
VAT calculator
Net ↔ gross, all French rates.
French notary fees
Transfer duties, fees, disbursements.
Mileage allowance (France)
2026 scale, all fiscal ratings.
French withholding tax
Personalised, neutral or individual rate.
French income tax
2026 brackets, discount, household ratio.
French activity bonus
Estimate by household composition.
French sole trader contributions
By activity, flat-tax option included.
French micro-business thresholds
VAT, ceilings, overruns.
French severance pay
Statutory and collective minimum.
Developer
JSON formatter
Indent, validate, minify.
JWT decoder
Header, payload, expiry.
Timestamp converter
Unix ↔ readable date, any zone.
Base64 encoder
Text and files, both ways.
UUID generator
v4 and v7, in batches.
Regex tester
Highlighted matches, named groups.
Text diff
Line and word level differences.
URL encoder
Components and query strings.
Hash generator
SHA-256, SHA-1, MD5 — locally.