# ZipKit

> Free, privacy-first developer tools. All tools run entirely in your browser — your data never leaves your device. No server processing, no tracking, no accounts.

Site: https://www.zipkit.dev.caliworkspaces.com/
Total tools: 67
Categories: 24
License: Free to use

## About

ZipKit is a collection of 67 developer utilities covering text processing, image manipulation, CSS generation, code formatting, data conversion, cryptography, color tools, network utilities, math calculators, and SEO tools. Every tool is 100% client-side: open the page, use the tool, nothing is uploaded or stored.

## Accessibility

- [WCAG Touch Target Size Checker](https://www.zipkit.dev.caliworkspaces.com/wcag-target-size/): Visualize WCAG 2.1 AA (44×44px) and 2.2 AA (24×24px) touch target requirements with an interactive overlay and batch checker.

## Audio & Sound

- [Audio Loudness Analyzer](https://www.zipkit.dev.caliworkspaces.com/audio-loudness-analyzer/): Analyze an audio file locally to get approximate integrated loudness, true peak, dynamic range, and technical metadata — nothing is uploaded.
- [Audio Stereo Panner Tester](https://www.zipkit.dev.caliworkspaces.com/audio-stereo-panner/): Test StereoPannerNode to move audio between left and right channels with a visual pan meter display.

## Code Formatters

- [Base64 Encode / Decode](https://www.zipkit.dev.caliworkspaces.com/base64-encode-decode/): Encode text to Base64 or decode Base64 back to text. Supports UTF-8 and URL-safe Base64.
- [URL Encode / Decode](https://www.zipkit.dev.caliworkspaces.com/url-encode-decode/): Encode or decode URLs and query strings. Handles special characters, Unicode, and percent-encoding.
- [Regex Tester](https://www.zipkit.dev.caliworkspaces.com/regex-tester/): Test regular expressions with real-time matching, highlighting, capture groups, and a common patterns library.
- [JS Intl.NumberFormat Playground](https://www.zipkit.dev.caliworkspaces.com/intl-numberformat-playground/): Interactive playground for JavaScript Intl.NumberFormat API.
- [JS Intl.DateTimeFormat Playground](https://www.zipkit.dev.caliworkspaces.com/intl-datetimeformat-playground/): Visualizer for JavaScript Intl.DateTimeFormat API with date styles and time zones.

## Color Tools

- [Color Picker](https://www.zipkit.dev.caliworkspaces.com/color-picker/): Pick any color with a visual spectrum, enter values in HEX, RGB, HSL, or CMYK, and copy to clipboard instantly.
- [Color Contrast Checker](https://www.zipkit.dev.caliworkspaces.com/color-contrast-checker/): Check WCAG AA and AAA color contrast ratios for text accessibility. Ensure your colors meet accessibility standards.

## Encoding & Security

- [Hash Generator](https://www.zipkit.dev.caliworkspaces.com/hash-generator/): Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text. Compare hashes to verify data integrity.
- [JWT Decoder](https://www.zipkit.dev.caliworkspaces.com/jwt-decoder/): Decode and inspect JWT tokens. View header, payload, expiration status, and verify signatures.
- [Caesar Cipher](https://www.zipkit.dev.caliworkspaces.com/caesar-cipher/): Encrypt and decrypt text with the Caesar letter-shift cipher (ROT1-ROT25). Includes brute-force all-shifts view.
- [Autokey Cipher](https://www.zipkit.dev.caliworkspaces.com/autokey-cipher/): Encrypt and decrypt with the Autokey cipher — extends the key with plaintext to eliminate Vigenère's period weakness.

## CSS & Design

- [Box Shadow Builder](https://www.zipkit.dev.caliworkspaces.com/box-shadow-builder/): Multi-layer CSS box-shadow editor with live preview, 8 presets, and one-click copy as CSS, Tailwind, or SwiftUI.

## Data Converters

- [CSV to JSON Converter](https://www.zipkit.dev.caliworkspaces.com/csv-to-json/): Convert CSV text to a JSON array instantly. Choose headers, delimiter, and auto-parse numbers and booleans.
- [Timeline Builder](https://www.zipkit.dev.caliworkspaces.com/timeline-builder/): Build a horizontal timeline from a list of events. Drag-to-pan, scroll-zoom, color-coded lanes, and one-click SVG export.
- [CSV Viewer](https://www.zipkit.dev.caliworkspaces.com/csv-viewer/): Open any CSV or TSV file in a sortable, searchable, virtualized table. Auto-detects delimiter and infers column types.

## Database & ORM

- [Redis Connection String Builder](https://www.zipkit.dev.caliworkspaces.com/redis-uri-builder/): Build valid redis:// and rediss:// connection URIs with authentication, port, and database index options.

## DevOps & Cloud

- [Cron Explainer](https://www.zipkit.dev.caliworkspaces.com/cron-explainer/): Decode any cron expression to plain English, validate each field, and preview the next firings. Five-field POSIX cron + 6-field (seconds) and 7-field (year) variants.
- [Nginx Reverse Proxy Generator](https://www.zipkit.dev.caliworkspaces.com/nginx-reverse-proxy/): Scaffolds Nginx .conf files tuned for routing traffic to local Node.js or Docker ports with SSL, WebSocket, and gzip support.
- [Kubernetes Pod YAML Generator](https://www.zipkit.dev.caliworkspaces.com/k8s-pod-generator/): Generates Kubernetes Pod manifests with multi-container, volume, resource limits, and environment variable support.

## Generators

- [UUID / ULID Generator](https://www.zipkit.dev.caliworkspaces.com/uuid-generator/): Generate UUIDs (v4) and ULIDs instantly. Bulk generate, validate, and copy unique identifiers.
- [ULID Generator](https://www.zipkit.dev.caliworkspaces.com/ulid-generator/): Generate Universally Unique Lexicographically Sortable Identifiers (ULIDs). Fast, secure, sortable IDs.
- [KSUID Generator](https://www.zipkit.dev.caliworkspaces.com/ksuid-generator/): Generate K-Sortable Unique Identifiers (KSUIDs) — time-ordered, Base62-encoded 27-character IDs with decode support. Fast & private.

## Hardware & Sensors

- [Ohm's Law Calculator](https://www.zipkit.dev.caliworkspaces.com/ohms-law-calculator/): Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to solve the other two.

## Image & Media

- [Image Resizer](https://www.zipkit.dev.caliworkspaces.com/image-resizer/): Resize images to any dimension or scale, with WebP / PNG / JPEG output and quality control. Drop, paste, or pick a file — runs entirely in your browser.

## JSON Tools

- [JSON Formatter & Validator](https://www.zipkit.dev.caliworkspaces.com/json-formatter/): Format, validate, and minify JSON data. Beautify with customizable indentation or compress to a single line.
- [JSON to Go](https://www.zipkit.dev.caliworkspaces.com/json-to-go/): Generate Go struct definitions from JSON data. Handles nested types, arrays, and adds json struct tags.
- [JSON to Java](https://www.zipkit.dev.caliworkspaces.com/json-to-java/): Generate Java POJO classes from JSON data. Supports Lombok annotations and Jackson serialization.
- [JSON to Kotlin](https://www.zipkit.dev.caliworkspaces.com/json-to-kotlin/): Generate Kotlin data classes from JSON. Supports Gson, Moshi, and kotlinx.serialization annotations.
- [JSON to Python](https://www.zipkit.dev.caliworkspaces.com/json-to-python/): Generate Python dataclasses, TypedDict, or Pydantic models from JSON data.
- [JSON to C#](https://www.zipkit.dev.caliworkspaces.com/json-to-csharp/): Generate C# classes from JSON data. Supports Newtonsoft.Json, System.Text.Json annotations, and C# records.
- [JSON to TypeScript](https://www.zipkit.dev.caliworkspaces.com/json-to-typescript/): Generate TypeScript interfaces and types from any JSON data. Handles nested objects, arrays, and union types.
- [JSON to Dart](https://www.zipkit.dev.caliworkspaces.com/json-to-dart/): Generate Dart/Flutter class definitions from JSON. Supports freezed and json_serializable packages.
- [JSON to Rust](https://www.zipkit.dev.caliworkspaces.com/json-to-rust/): Generate Rust struct definitions with serde Serialize/Deserialize from JSON data.
- [JSON to GraphQL](https://www.zipkit.dev.caliworkspaces.com/json-to-graphql/): Generate GraphQL Schema Definition Language (SDL) types from JSON data structures.
- [JSON to Zod](https://www.zipkit.dev.caliworkspaces.com/json-to-zod/): Generate Zod validation schemas from JSON data. Includes TypeScript type inference.
- [JSON to MySQL](https://www.zipkit.dev.caliworkspaces.com/json-to-mysql/): Generate MySQL CREATE TABLE statements from JSON array data. Infers column types automatically.
- [JSON to JSON Schema](https://www.zipkit.dev.caliworkspaces.com/json-to-json-schema/): Generate a JSON Schema definition from any JSON data structure. Supports draft-07 and 2020-12.
- [JSON to MobX State Tree](https://www.zipkit.dev.caliworkspaces.com/json-to-mobx-state-tree/): Convert JSON payloads into MobX State Tree (MST) model definitions with inferred types.
- [JSON to Redux Toolkit Slice](https://www.zipkit.dev.caliworkspaces.com/json-to-redux-toolkit/): Generate Redux Toolkit slice boilerplate (state, reducers, actions) from a JSON initial state.
- [Standard JSON to DynamoDB JSON](https://www.zipkit.dev.caliworkspaces.com/json-to-dynamodb/): Inject AWS DynamoDB type descriptors (S, N, L, M) into standard JSON for use with the DynamoDB API.
- [JSON to Avro Schema](https://www.zipkit.dev.caliworkspaces.com/json-to-avro/): Infer an Apache Avro schema from a pasted JSON object or array. Instantly generates the correct Avro record definition.
- [JSON to TOML Converter](https://www.zipkit.dev.caliworkspaces.com/json-to-toml/): Convert JSON objects to TOML configuration format instantly. Supports nested objects, arrays, strings, numbers, booleans, and ISO dates.
- [JSON to CSV Converter](https://www.zipkit.dev.caliworkspaces.com/json-to-csv/): Convert a JSON array of objects to CSV format. Auto-detects all keys as headers. Choose delimiter and quoting options.
- [JSON to XML Converter](https://www.zipkit.dev.caliworkspaces.com/json-to-xml/): Convert JSON objects and arrays to well-formed XML. Set root and item element names, indentation, and XML declaration.

## Math, Date & Unit

- [Bytes & Data Size Converter](https://www.zipkit.dev.caliworkspaces.com/bytes-converter/): Convert between bytes, KB, MB, GB, TB, and PB with binary (1024) and decimal (1000) modes.
- [Hexadecimal to Decimal](https://www.zipkit.dev.caliworkspaces.com/hex-to-decimal/): Convert hex values to decimal, binary, and octal instantly. Color-coded nibbles, positional value breakdown, signed 32-bit interpretation, and batch mode.
- [Decimal to Hexadecimal](https://www.zipkit.dev.caliworkspaces.com/decimal-to-hex/): Converts standard base-10 integers into base-16 hex values. See hex, binary, octal, colour-coded digits, and division-by-16 algorithm steps.

## Network & Web

- [IPv4 Address Analyzer](https://www.zipkit.dev.caliworkspaces.com/ipv4-validator/): Validate and analyze IPv4 addresses. Classify type, display binary and hex, compute subnet details from CIDR.
- [IPv6 Address Validator](https://www.zipkit.dev.caliworkspaces.com/ipv6-validator/): Validate and analyze IPv6 addresses — see expanded form, compressed form, address type, scope, and IPv4-mapped detection.

## Performance & Budgets

- [Bundle Size Estimator](https://www.zipkit.dev.caliworkspaces.com/bundle-size-estimator/): Paste any JavaScript, CSS, or HTML to see its raw size and estimated gzip payload — find out exactly how much bandwidth your code costs.

## Regex Tools

- [Reverse Regex Generator](https://www.zipkit.dev.caliworkspaces.com/reverse-regex-generator/): Enter a regular expression and instantly generate random string examples that match it — perfect for testing, fuzzing, and generating mock data.

## Web Security

- [CSP Header Builder](https://www.zipkit.dev.caliworkspaces.com/csp-header-builder/): Visually constructs and validates strict Content Security Policy HTTP headers directive by directive.

## SEO Tools

- [Sitemap.xml URL Extractor](https://www.zipkit.dev.caliworkspaces.com/sitemap-url-extractor/): Paste sitemap XML to extract all URLs — supports standard urlset and sitemapindex formats with path prefix and lastmod date range filters. Download as .txt.

## SVG & Vector

- [SVG Path Editor & Visualizer](https://www.zipkit.dev.caliworkspaces.com/svg-path-editor/): Parse, visualize, and edit SVG path d attribute strings with live preview and command breakdown.

## Text & String

- [Case Converter](https://www.zipkit.dev.caliworkspaces.com/case-converter/): Convert text between uppercase, lowercase, camelCase, snake_case, Title Case, and 8 more formats.
- [Lorem Ipsum Generator](https://www.zipkit.dev.caliworkspaces.com/lorem-ipsum/): Generate placeholder text — paragraphs, sentences, or words. Perfect for design mockups and development.
- [Reverse String](https://www.zipkit.dev.caliworkspaces.com/reverse-string/): Reverse text, words, or lines instantly. Flip your text backwards with one click.
- [Add Prefix & Suffix](https://www.zipkit.dev.caliworkspaces.com/prefix-suffix/): Add prefix and/or suffix text to each line. Perfect for bulk formatting, list numbering, and code generation.
- [Text Repeater](https://www.zipkit.dev.caliworkspaces.com/text-repeater/): Repeat any text multiple times with a custom separator. Great for testing, filler content, and pattern generation.
- [Word Counter & Text Statistics](https://www.zipkit.dev.caliworkspaces.com/text-statistics/): Count words, characters, sentences, paragraphs, and reading time. Analyze keyword density.
- [Text Diff Checker](https://www.zipkit.dev.caliworkspaces.com/text-diff/): Compare two text blocks and highlight added, removed, and changed lines. Ideal for comparing code, documents, or any text.

## Typography & Fonts

- [Web Font Preloader & Base64 Generator](https://www.zipkit.dev.caliworkspaces.com/web-font-preloader/): Convert .ttf or .woff2 font files to base64 and generate the exact @font-face CSS and <link rel="preload"> HTML to prevent font layout shift.

## Video & Subtitles

- [VTT to SRT Subtitle Converter](https://www.zipkit.dev.caliworkspaces.com/vtt-to-srt/): Convert WebVTT subtitle files to SubRip (SRT) format by stripping cue settings and reformatting timestamps.

## WebRTC & Real-time

- [Raycast Visualizer](https://www.zipkit.dev.caliworkspaces.com/raycast-visualizer/): Interactive 2D raycasting + visibility-polygon demo. Pointer-driven light source, three preset scenes, polygon or ray-line render, PNG export.

## Content

- [Blog](https://www.zipkit.dev.caliworkspaces.com/blog/): Weekly updates, new tools, and developer tips
- [Glossary](https://www.zipkit.dev.caliworkspaces.com/glossary/): Developer glossary — definitions of formats, encodings, and standards
- [Cheatsheets](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/): Quick reference tables for regex, HTTP codes, CSS, Git, and more
- [Guides](https://www.zipkit.dev.caliworkspaces.com/guides/): Step-by-step how-to guides for each tool

### Cheatsheets

- [_template](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/_template/)
- [Ascii](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/ascii/)
- [Base64](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/base64/)
- [Character Encoding](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/character-encoding/)
- [Chmod Permissions](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/chmod-permissions/)
- [Cidr Notation](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/cidr-notation/)
- [Color Formats](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/color-formats/)
- [Cors](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/cors/)
- [Country Codes](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/country-codes/)
- [Cron Syntax](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/cron-syntax/)
- [Csp](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/csp/)
- [Css Flexbox](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/css-flexbox/)
- [Css Grid](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/css-grid/)
- [Css Selectors](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/css-selectors/)
- [Css Units](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/css-units/)
- [Csv Format](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/csv-format/)
- [Docker Commands](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/docker-commands/)
- [Encryption Algorithms](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/encryption-algorithms/)
- [Git Commands](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/git-commands/)
- [Hash Algorithms](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/hash-algorithms/)
- [Htaccess](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/htaccess/)
- [Html Entities](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/html-entities/)
- [Http Headers](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/http-headers/)
- [Http Methods](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/http-methods/)
- [Http Status Codes](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/http-status-codes/)
- [Javascript Array Methods](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/javascript-array-methods/)
- [Javascript Date](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/javascript-date/)
- [Javascript String Methods](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/javascript-string-methods/)
- [Json Syntax](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/json-syntax/)
- [Jwt Structure](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/jwt-structure/)
- [Markdown Syntax](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/markdown-syntax/)
- [Mime Types](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/mime-types/)
- [Nginx Directives](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/nginx-directives/)
- [Oauth2 Flows](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/oauth2-flows/)
- [Regex](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/regex/)
- [Security Headers](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/security-headers/)
- [Si Prefixes](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/si-prefixes/)
- [Sql Cheatsheet](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/sql-cheatsheet/)
- [Tcp Udp Ports](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/tcp-udp-ports/)
- [Timezone List](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/timezone-list/)
- [Toml Syntax](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/toml-syntax/)
- [Unicode](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/unicode/)
- [Unix Timestamps](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/unix-timestamps/)
- [Url Encoding](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/url-encoding/)
- [Yaml Syntax](https://www.zipkit.dev.caliworkspaces.com/cheatsheets/yaml-syntax/)

### Glossary (68 terms)

- [_template](https://www.zipkit.dev.caliworkspaces.com/glossary/_template/)
- [Acid](https://www.zipkit.dev.caliworkspaces.com/glossary/acid/)
- [Api Key](https://www.zipkit.dev.caliworkspaces.com/glossary/api-key/)
- [Ascii](https://www.zipkit.dev.caliworkspaces.com/glossary/ascii/)
- [Ast](https://www.zipkit.dev.caliworkspaces.com/glossary/ast/)
- [Base64](https://www.zipkit.dev.caliworkspaces.com/glossary/base64/)
- [Canonical Url](https://www.zipkit.dev.caliworkspaces.com/glossary/canonical-url/)
- [Canvas](https://www.zipkit.dev.caliworkspaces.com/glossary/canvas/)
- [Capture Group](https://www.zipkit.dev.caliworkspaces.com/glossary/capture-group/)
- [Chroma Subsampling](https://www.zipkit.dev.caliworkspaces.com/glossary/chroma-subsampling/)
- [Cors](https://www.zipkit.dev.caliworkspaces.com/glossary/cors/)
- [Crlf](https://www.zipkit.dev.caliworkspaces.com/glossary/crlf/)
- [Cron Expression](https://www.zipkit.dev.caliworkspaces.com/glossary/cron-expression/)
- [Csrf](https://www.zipkit.dev.caliworkspaces.com/glossary/csrf/)
- [Css Grid](https://www.zipkit.dev.caliworkspaces.com/glossary/css-grid/)
- [Csv](https://www.zipkit.dev.caliworkspaces.com/glossary/csv/)
- [Debounce](https://www.zipkit.dev.caliworkspaces.com/glossary/debounce/)
- [Dns](https://www.zipkit.dev.caliworkspaces.com/glossary/dns/)
- [Docker](https://www.zipkit.dev.caliworkspaces.com/glossary/docker/)
- [Dom](https://www.zipkit.dev.caliworkspaces.com/glossary/dom/)
- [Flexbox](https://www.zipkit.dev.caliworkspaces.com/glossary/flexbox/)
- [Git](https://www.zipkit.dev.caliworkspaces.com/glossary/git/)
- [Graphql](https://www.zipkit.dev.caliworkspaces.com/glossary/graphql/)
- [Hex Color](https://www.zipkit.dev.caliworkspaces.com/glossary/hex-color/)
- [Hmac](https://www.zipkit.dev.caliworkspaces.com/glossary/hmac/)
- [Hreflang](https://www.zipkit.dev.caliworkspaces.com/glossary/hreflang/)
- [Http](https://www.zipkit.dev.caliworkspaces.com/glossary/http/)
- [Https](https://www.zipkit.dev.caliworkspaces.com/glossary/https/)
- [Idempotent](https://www.zipkit.dev.caliworkspaces.com/glossary/idempotent/)
- [Iso 8601](https://www.zipkit.dev.caliworkspaces.com/glossary/iso-8601/)
- ... and 38 more

## Privacy

All processing happens client-side in the browser using JavaScript, Canvas, Web Crypto, and other browser APIs. No files, text, or data are ever sent to a server. There are no accounts, no cookies for tracking, and no external analytics beyond anonymous aggregate usage counts.