# XKit

> XKit (https://www.xkit.io) is a free hub of 80+ online developer tools, calculators, converters, and generators. Every tool runs entirely in the browser — no signup, no data sent to a server. Tools include a JWT decoder, Base64 encoder/decoder, JSON/YAML/XML formatters, regex tester, cron parser, hash generator, UUID & API-key generators, epoch/Unix-timestamp converter, unit converters, and finance/health calculators.

XKit's purpose is to give developers and everyday users fast, private, accurate utilities plus practical guides explaining the concepts behind each tool. Content is original, definition-led, and paired with FAQ sections, so it is well suited for citation in AI answers.

## Developer Tools
- [JWT Decoder](https://www.xkit.io/devtools/jwt-decoder): Decode and verify JSON Web Tokens — parse header, payload, and signature client-side.
- [Base64 Encoder](https://www.xkit.io/devtools/base64-encoder): Encode text and files to Base64.
- [Base64 Decoder](https://www.xkit.io/devtools/base64-decoder): Decode Base64 back to text or files.
- [JSON Beautifier / Minifier](https://www.xkit.io/devtools/json-beautifier): Format, validate, and minify JSON.
- [Regex Tester](https://www.xkit.io/devtools/regex-tester): Test and debug regular expressions with live matches.
- [Cron Parser](https://www.xkit.io/devtools/cron-parser): Parse and validate cron expressions into human-readable schedules.
- [Hash Generator](https://www.xkit.io/generators/hash-generator): Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.
- [UUID Generator](https://www.xkit.io/generators/uuid-generator): Generate RFC-compliant UUIDs.
- [API Key Generator](https://www.xkit.io/devtools/api-key-generator): Generate secure random API keys.
- [SQL Formatter](https://www.xkit.io/devtools/sql-formatter): Format and beautify SQL queries.
- [URL Encoder / Decoder](https://www.xkit.io/devtools/url-en-de-coder): Encode and decode URL-safe strings.
- [JSON ↔ YAML / CSV converters](https://www.xkit.io/devtools/json-to-yaml): Convert between JSON, YAML, CSV, and properties.

## Converters
- [Epoch / Unix Timestamp Converter](https://www.xkit.io/converters/epoch-converter): Convert between Unix timestamps and human-readable dates.
- [Time Zone Converter](https://www.xkit.io/converters/time-zone-converter): Convert times across time zones.
- [Unit Converters](https://www.xkit.io/converters): Temperature, weight, distance, area, digital storage, network speed, and more.

## Calculators
- [Mortgage Calculator](https://www.xkit.io/calculators/mortgage-calculator): Estimate monthly mortgage payments. (Estimates only — not financial advice.)
- [Compound Interest Calculator](https://www.xkit.io/calculators/compound-interest-calculator): Project savings growth over time.
- [BMI Calculator](https://www.xkit.io/calculators/bmi-calculator): Estimate body mass index. (Estimates only — not medical advice.)
- [CIDR Calculator](https://www.xkit.io/calculators/cidr-calculator): Calculate IP ranges and subnet masks.
- [All calculators](https://www.xkit.io/calculators): Finance, health, date/time, and math calculators.

## Generators
- [Random Password Generator](https://www.xkit.io/generators/random-password-generator): Generate strong random passwords.
- [QR Code Generator](https://www.xkit.io/generators/qr-code-generator): Create custom QR codes.
- [Placeholder Image Generator](https://www.xkit.io/generators/placeholder-image-generator): Generate placeholder images for mockups.

## Diff Tools
- [Text Comparison Tool](https://www.xkit.io/difftools/text-compare): Compare two text blocks and highlight differences.
- [Document Comparison Tool](https://www.xkit.io/difftools/document-compare): Diff Word, PDF, and document files privately.

## Guides
- [Developer Tutorials (Blog)](https://www.xkit.io/blog): Practical guides on JWTs, Unix timestamps, cron expressions, hashing, Base64, and common developer workflows.

## About
- [About XKit](https://www.xkit.io/about): Mission and team behind XKit.
- [Privacy Policy](https://www.xkit.io/privacy-policy): All tools process data in the browser; nothing is stored or transmitted.