Tools for everyday work.

Brazilian e-invoice key decoder (NF-e / NFC-e)

The 44 digits printed on a Brazilian receipt aren't random: they encode state, issuer tax ID, document model, series, number and a modulo-11 check digit. Paste the key and read what it says.

Pix copy-and-paste reader and validator

A Pix code is an EMV payload: nested TLV fields closed by a CRC16-CCITT. Paste the code and see who gets the money, how much, and whether the payload is intact before paying.

Domain email diagnosis

If your domain has no SPF, DKIM and DMARC, your sales proposal has a strong chance of landing in the customer's spam folder — and you never find out. Enter the domain and see in seconds.

HTTP security header audit

Seven headers separate a site that resists XSS and clickjacking from one that merely looks safe because it has a padlock. Enter the domain and get a graded, field-by-field report.

Selling price & food-cost calculator

Selling well and going broke at the same time is common: almost everyone knows revenue, almost nobody knows margin. Enter the plate cost and find the price that hits your target margin.

Margin simulator by sales channel

The same dish sold on a delivery app, on your own site and at the counter leaves three very different profits. See what's left per channel, side by side, and what the commission costs per month.

Brazilian company lookup (CNPJ)

Before closing with a supplier or accepting a large order, it's worth checking whether the company is active, how long it has existed and who signs for it. Enter the tax ID and read the public registry.

Currency converter with today's rate

For quoting in dollars or yen without guessing the exchange rate. I use this on proposals for Japan, where the client needs the figure in ¥ and I need to be paid in R$.

Fetching rate…

Is your company's domain free?

Before printing cards and signage, check whether the address you want still exists. The lookup hits registro.br directly.

Postcode lookup with address and coordinates

For filling in a customer record, checking a delivery area or building a supplier file without typos.

Contract adjustment by inflation (IPCA)

Every annual contract gets adjusted, and almost nobody runs the numbers at renewal. Here the accumulated index comes straight from the Central Bank.

Fetching IPCA from the Central Bank…

Public holidays and the effect on your roster

A Tuesday or Thursday holiday turns into a long weekend, and that changes purchasing, staffing and footfall. See the calendar already tagged by type.

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Recipe costing: yield factor and cost per portion

You buy 1 kg of meat but you don't use 1 kg. Bone, fat, peel and trim come off. The yield factor shows what you really pay for what reaches the plate.

Margin vs markup: the calculation almost everyone gets wrong

Adding 30% on top of cost does not give you a 30% margin. It gives 23%. That gap leaves your pocket every month unnoticed.

Brazilian invoice data extractor (NF-e / NFC-e XML)

Upload or paste the invoice XML and see issuer, recipient, line items with quantity and price, taxes, payment and the total — already separated. The file is read in your browser, no server upload.

Brazilian CPF validator

Check whether a CPF actually exists: the last two digits are derived from the first nine by modulo 11. The ninth digit even reveals the fiscal region that issued the number. Runs in your browser.

Enter a CPF to validate.

Brazilian area code lookup (DDD)

Area codes (DDD) are assigned by region by Anatel. Type the code and see the state and served cities — handy for checking records and defining service areas.

Brazilian bank codes (COMPE and ISPB)

Type the bank code, the ISPB or part of the name and see the institution. Useful to check a boleto, DDA, remittance file and the code shown in the app when you pay.

Selic, CDI and compound yield calculator

The daily rate comes from the Central Bank. On top of it, simulate how much a value yields in compound interest: enter the amount, the rate and the term and see the total, the interest and the effective rate.