Need it, stuck, want to solve it fast?UtilizAí.
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Everything you need in one place, no more juggling a thousand tabs.
142 interactive tools + 3,842 scientific calculators, converters, generators, validators, and everyday utilities. Fast, with no hidden paywall.
% CALC · INTEREST
Fixed-rate loan
$ 573.21 / month
⚡ CONV · CURRENCY
USD → BRL
1 USD = R$ 5.47
# GEN · TAX ID
Generator · valid
47.823.119/0001-58
{} FMT · JSON
Format + validate
412 lines · OK
3,984+
tools and calculators
142
interactive tools
3,842
scientific calculators
0
mandatory signup
Organized by what you're trying to do.
13 categories. Direct navigation, no endless nested menus.
Financial
Interest, installments, income tax, payroll, FX.
Converters
Currency, units, time, bases.
Generators
IDs, UUIDs, passwords, lorem ipsum.
Developers
JSON, regex, base64, diff, JWT.
Text
Count, clean, case, markdown.
Date & Time
Difference, timezone, cron, stopwatch.
Image
Optimize, edit, convert, protect.
PDF & Docs
Merge, split, convert, protect, compare.
Video & Audio
Compress, convert, extract audio.
Brazil Official
ZIP, NCM, SELIC, Receita Federal.
Daily Life
Health, geo, everyday wellness.
Speech Therapy
Voice, language, swallowing, clinical.
Scientific Calculators
Physics, Chemistry, Math, Biology, Engineering and more, 14 areas.
Featured tools.
Editorial pick of the most useful everyday tools.
#01 · /ferramentas/calculadora-juros-compostos
Compound interest
Simulate investments with monthly contributions, inflation, and reinvestment.
#02 · /ferramentas/gerador-cnpj
Valid CNPJ generator
For form and integration testing. With or without mask.
#03 · /ferramentas/consulta-cnpj
CNPJ lookup
Company data, partners, and CNAE via Receita Federal.
#04 · /ferramentas/juntar-pdf
Merge PDFs
No size limit, no watermark, local processing.
#05 · /ferramentas/conversor-moedas
Currency converter
Official Central Bank rates in 170+ currencies.
#06 · /ferramentas/contador-palavras
Word counter
Characters, words, paragraphs, and estimated reading time.
Not sure which tool to use?
Describe the problem.
UtilizAí's AI understands natural language, suggests the right tool, and can even run the whole action without you leaving the chat.
01Understands casual English, "how much does 5k yield at 12% per year?"
02Combines multiple tools into a single workflow.
03Cites official sources in every response.
UUtilizAí Assistant
illustrative exampleI need to convert 2500 dollars to reais at today's rate and calculate the FX tax
Using a hypothetical rate of 1 USD = R$ 5.47, US$ 2,500 = R$ 13,675.00.
. With FX tax of 1.10% (currency purchase), the tax would be R$ 150.43. Total: R$ 13,825.43.↗ in the real app, official sources: bcb.gov.br · rfb.gov.br
. With FX tax of 1.10% (currency purchase), the tax would be R$ 150.43. Total: R$ 13,825.43.↗ in the real app, official sources: bcb.gov.br · rfb.gov.br
What if I split it into 3 installments?
One site. Four profiles served.
Independent professional
Fee calculation, receipt issuing, document conversion.
Developers & IT
JSON, regex, JWT, encoding, REST APIs.
Entrepreneur
Pricing, margins, tax simulation, financing.
Personal use
Split bill, tip, BMI, travel time calculations.
One account, 3,984+ tools and calculators.
Zero friction.
Free forever on the base plan. No credit card required.