Zykit · Private tools that run in your browser

A growing set of file and developer tools that run entirely on your device. Nothing is uploaded.

Clean Image: Inspect and remove hidden image metadata
JWT Decoder: Decode and verify JSON Web Tokens
Diff Checker: Compare two texts line by line
JS Runner: Run JavaScript and TypeScript in your browser
JSON Formatter: Format, validate and minify JSON
Encode / Decode: Base64, URL, HTML entity and hex
Hash Generator: MD5, SHA and HMAC of any text
UUID Generator: Generate UUID v4 and v7 in bulk
Timestamp Converter: Unix time ↔ human dates
Regex Tester: Test regular expressions live
URL Parser: Break a URL into its parts
HTTP Status Codes: Look up any HTTP status code
MIME Type Lookup: File extension ↔ MIME type
Password Generator: Strong random passwords and passphrases
Random String Generator: Random tokens, IDs and keys
Slug Generator: Turn titles into URL slugs
Case Converter: camelCase, snake_case, Title Case and more
Word Counter: Count words, characters and reading time
JSON to TypeScript: Generate TypeScript types from JSON
JSON Diff: Compare two JSON documents structurally
JSON to SQL: Turn JSON arrays into SQL inserts
YAML ↔ JSON: Convert between YAML and JSON
XML ↔ JSON: Convert between XML and JSON
CSV ↔ JSON: Convert between CSV and JSON
CSV Viewer: View, sort and filter CSV files
SQL Formatter: Format and beautify SQL queries
cURL ↔ Fetch: Convert cURL commands to fetch and back
Markdown Editor: Write Markdown with a live preview
Text Cleaner: Remove duplicate lines, empty lines and extra spaces
Find & Replace: Find and replace in any text
Cron Expression Builder: Build and explain cron schedules
User-Agent Parser: Identify browser, OS and device from a user agent
HTTP Headers Inspector: Paste response headers and get them explained
JWT Generator: Create and sign test JSON Web Tokens
Certificate Inspector: Decode PEM certificates and keys
Meta Tag Inspector: Check a page's SEO and social tags
UTM Builder: Build campaign URLs with UTM parameters
URL Cleaner: Strip tracking parameters from links
Robots.txt Generator: Create and test a robots.txt file
Sitemap Generator: Create an XML sitemap from a list of URLs
Image Compressor: Shrink JPEG, WebP and AVIF images in your browser
Image Resizer: Resize images by pixels, percentage or to fit a box
Image Converter: Convert between PNG, JPEG, WebP and AVIF
Image to Base64: Encode images as Base64 data URIs and decode them back
SVG Optimizer: Minify and sanitize SVG files
Favicon Generator: Make favicon.ico, Apple and Android icons from an image or emoji
Color Converter: HEX, RGB, HSL, OKLCH and contrast checks
Number Base Converter: Binary, octal, decimal, hex and float bits
IP / CIDR Calculator: Subnets, masks and IP ranges for IPv4 and IPv6
JSONPath Query: Query JSON with JSONPath expressions
JSON Schema Validator: Validate JSON against a schema, or generate one
Semver Checker: Check versions against semver ranges
chmod Calculator: Unix permissions: rwx ↔ octal
.env Diff: Compare and validate .env files
TOTP Generator: Generate and verify 2FA codes
String Escaper: Escape and unescape strings for any language
Unicode Inspector: See every character, code point and hidden symbol
Mock Data Generator: Generate realistic fake data
QR Code Generator: Create QR codes for links, Wi-Fi and contacts
Lorem Ipsum Generator: Placeholder text in paragraphs, sentences or words
Date Calculator: Date differences, business days and durations
Unit Converter: Convert bytes, lengths, weights, temperatures and more
Query CSV with SQL: Run SQL queries on CSV files
PDF Merge & Split: Merge, split, reorder and rotate PDFs
PDF Metadata Cleaner: See and remove hidden PDF metadata
Office Metadata Cleaner: Remove author and revision data from Word, Excel and PowerPoint
Images to PDF: Combine images into one PDF
Image Editor: Crop, rotate, resize and adjust images
Encrypt / Decrypt Text: Encrypt text with a passphrase (AES-GCM)
SSH Key Generator: Generate Ed25519 and RSA SSH keys locally
Email Header Analyzer: Trace an email's path and check SPF, DKIM and DMARC
JSON to Code: Generate Go, Python, Rust, Java, C# and Kotlin models from JSON
docker run ↔ Compose: Convert docker run commands to docker-compose and back
Color Palette Extractor: Pull the dominant colours out of any image
Password Strength Checker: How long would your password take to crack?
SPF / DKIM / DMARC Checker: Validate and explain email DNS records
Kubernetes YAML Checker: Validate and explain Kubernetes manifests
.gitignore Generator: Build a .gitignore from presets
CSP Builder: Build and check a Content-Security-Policy
JSON-LD Generator: Create schema.org structured data
Open Graph Image Generator: Make 1200×630 social preview images
CSS Generator: Gradients, shadows, clamp() and more
Time Zone Meeting Planner: Find meeting times across time zones