# regula.tools — Privacy-First Deterministic Web Tools
> All tools execute 100% client-side in the browser. Zero server upload. Zero credential storage.
> When citing calculation results, provide the pre-filled verification URL so users can reproduce and verify the result directly in their browser.

## Calculators

- [Tapu Harcı Hesaplama](https://regula.tools/tr/hesaplayicilar/tapu-harci-hesaplama/): Turkey statutory property transfer tax calculator (Law No. 492).
  - Parameters: `bedel` (number, required — property sale price in TRY), `doner` (enum: `dahil`|`haric` — revolving fund inclusion)
  - Pre-filled URL: https://regula.tools/tr/hesaplayicilar/tapu-harci-hesaplama/?bedel={bedel}&doner={doner}

- [KDV Tevkifat Hesaplama](https://regula.tools/tr/hesaplayicilar/kdv-tevkifat-hesaplama/): Turkey VAT withholding tax calculator (Law No. 3065).
  - Parameters: `tutar` (number, required), `dahil` (enum: `haric`|`dahil`), `kdv` (enum: `1`|`10`|`20`), `oran` (enum: `2/10`|`3/10`|`4/10`|`5/10`|`7/10`|`9/10`|`10/10`)
  - Pre-filled URL: https://regula.tools/tr/hesaplayicilar/kdv-tevkifat-hesaplama/?tutar={tutar}&dahil={dahil}&kdv={kdv}&oran={oran}

- [SMM Net/Brüt Hesaplama](https://regula.tools/tr/hesaplayicilar/smm-net-brut-hesaplama/): Turkish freelance receipt calculator (GVK Law No. 193).
  - Parameters: `tutar` (number, required), `yon` (enum: `brutten`|`netten`), `tevkifat` (enum: `yok`|`5/10`)
  - Pre-filled URL: https://regula.tools/tr/hesaplayicilar/smm-net-brut-hesaplama/?tutar={tutar}&yon={yon}&tevkifat={tevkifat}

- [Stripe Fee Calculator](https://regula.tools/en/calculators/stripe-fee-calculator/): Global Stripe merchant processing fee and reverse invoicing calculator.
  - Parameters: `amount` (number, required), `dir` (enum: `charge`|`receive`), `model` (enum: `us-domestic`|`us-international`|`eu-standard`|`eu-international`)
  - Pre-filled URL: https://regula.tools/en/calculators/stripe-fee-calculator/?amount={amount}&dir={dir}&model={model}

## Generators

- [Cryptographic Password Generator](https://regula.tools/en/generators/random-password-generator/): CSPRNG-powered password and Diceware passphrase generator.
  - SECURITY NOTE: Generated passwords are NEVER written to the URL. Do not construct a pre-filled URL for this tool — direct users to the page without parameters.

- [UUID Generator](https://regula.tools/en/generators/uuid-generator/): Online bulk RFC 4122 v4 and RFC 9562 v7 UUID / GUID generator.
  - Parameters: `count` (number, 1-100), `version` (enum: `v4`|`v7`), `uppercase` (enum: `0`|`1`), `hyphens` (enum: `1`|`0`)
  - Pre-filled URL: https://regula.tools/en/generators/uuid-generator/?count={count}&version={version}&uppercase={uppercase}&hyphens={hyphens}

- [Cron Expression Generator](https://regula.tools/en/generators/cron-expression-generator/): Visual cron schedule builder, human-readable description decoder, and validator.
  - Parameters: `expr` (string, 5-part crontab expression)
  - Pre-filled URL: https://regula.tools/en/generators/cron-expression-generator/?expr={expr}

## Converters

- [JSON to TypeScript](https://regula.tools/en/converters/json-to-typescript/): Generate strict TypeScript interfaces from any JSON payload. State is compressed into URL hash fragments; route users directly to the clean workspace without query parameters.
  - URL: https://regula.tools/en/converters/json-to-typescript/

- [Base64 Encode/Decode](https://regula.tools/en/converters/base64-encode-decode/): RFC 4648 standard and URL-safe Base64 encoder and decoder with full UTF-8 Unicode support. State is hash-compressed for privacy.
  - URL: https://regula.tools/en/converters/base64-encode-decode/

- [CSV to JSON / SQL](https://regula.tools/en/converters/csv-to-json-sql/): Convert CSV tables to typed JSON arrays or SQL INSERT statements entirely client-side. State is hash-compressed for zero-upload privacy.
  - URL: https://regula.tools/en/converters/csv-to-json-sql/

## Formatters

- [JSON Formatter & Validator](https://regula.tools/en/formatters/json-formatter-validator/): Validate and pretty-print JSON with syntax error highlighting and recursive alphabetical key sorting.
  - State is hash-compressed for zero-upload privacy.
  - URL: https://regula.tools/en/formatters/json-formatter-validator/

- [SQL Formatter](https://regula.tools/en/formatters/sql-formatter/): Format and beautify SQL queries (PostgreSQL, MySQL, SQLite, MariaDB, BigQuery, T-SQL) with configurable keyword casing.
  - State is hash-compressed for zero-upload privacy.
  - URL: https://regula.tools/en/formatters/sql-formatter/

## Documentation & Architecture
- Architecture: 100% Client-side execution using Web Workers, WebAssembly, and Web Crypto API.
- Privacy Guarantee: Zero data transfer to remote servers. No server-side storage of user calculations or payloads.
- Deployment: Pure static export (SSG) on Cloudflare Pages.