Precision tooling for modern stacks.
A free, anonymous-first workbench packed with formatting, encoding, validation, and generation tools. Everything runs in your browser — no login, no tracking, no paywall.
81+
Live Tools
6
Categories
0 ms
Server Roundtrips
100%
Free & Anonymous
Most used
Popular Tools
Jump into the tools developers reach for most.
JSON Formatter
Data Tools
Paste or upload JSON to instantly format, validate, and minify it. Spot syntax errors with line-level feedback, switch b...
JSON Fixer
Data Tools
Paste broken JSON and automatically fix common issues: trailing commas, unquoted keys, single quotes, comments, missing ...
JSON Parser
Data Tools
Query, extract, flatten JSON & generate typed code
Prettier Formatter
Data Tools
Format code with Prettier
Base64 Encoder/Decoder
Data Tools
Encode and decode Base64 with UTF-8 support
JWT Analyzer
API Tools
Decode JWT tokens, inspect claims
Regex Tester
Data Tools
Test regex patterns with match highlighting
UUID & Hash Generator
Data Tools
Generate UUIDs, MD5, SHA hashes
Click Format to see the result...Why Check Kit Tool
Built different
Anonymous-first
No accounts, no tracking. Your data never leaves the browser. We don't store, log, or transmit anything.
Email address
Password
Credit card
Browser-native
Every tool runs entirely in your browser. Zero server calls, zero latency.
Split editors
Side-by-side input and output panels.
Command palette
Jump to any tool instantly.
Zero config
Paste. Click. Done.
Action clarity
One tool, one purpose, zero confusion.
How it works
Operator Flow
Enter raw input
Paste, type, or drag-and-drop your data into the editor panel.
Run precise transforms
Format, validate, encode, decode, or generate with one action.
Carry clean output forward
Copy the result, download it, or save the session for later.
81 tools available
All Tools
Search by name, category, or keyword. Every tool is free and works instantly.
JSON Formatter
Data Tools
Format, validate, minify JSON
JSON Fixer
Data Tools
Auto-repair broken or malformed JSON
JSON Parser
Data Tools
Query, extract, flatten JSON & generate typed code
SQL Formatter
Data Tools
Format and beautify SQL queries
Regex Tester
Data Tools
Test regex patterns with match highlighting
UUID & Hash Generator
Data Tools
Generate UUIDs, MD5, SHA hashes
GZIP Compressor
Data Tools
Compress text/data with GZIP
GZIP Decompressor
Data Tools
Decompress GZIP-encoded data
Base64 Encoder/Decoder
Data Tools
Encode and decode Base64 with UTF-8 support
Diff Viewer
Data Tools
Compare two texts and view line-by-line differences
Markdown Preview
Data Tools
Write Markdown and preview rendered HTML live
Color Converter
Data Tools
Convert colors between HEX, RGB, HSL, and OKLCH
Prettier Formatter
Data Tools
Format code with Prettier
CSS Beautifier
Data Tools
Beautify and minify CSS
HTML Beautifier
Data Tools
Beautify and minify HTML
HTML Viewer
Data Tools
Write HTML, CSS & JS and see live preview
JavaScript Beautifier
Data Tools
Beautify and minify JavaScript
XML Formatter
Data Tools
Format and validate XML
Case Converter
Data Tools
Convert between camelCase, snake_case, kebab-case & more
Lorem Ipsum Generator
Data Tools
Generate placeholder text in words, sentences, or paragraphs
Markdown to HTML
Data Tools
Convert Markdown into fragment, full document, or minified HTML
Text Diff (Side-by-Side)
Data Tools
Compare two texts with paired line-by-line highlighting
Password Generator
Data Tools
Cryptographically secure random passwords with strength meter
Timestamp Converter
Data Tools
Unix ↔ ISO 8601 ↔ human & relative time
Image Base64 Converter
Image Tools
Encode images to base64 / decode back to downloadable files
QR Code Generator
Data Tools
Generate customizable QR codes, export PNG & SVG
JSON ↔ CSV
Data Tools
Bidirectional JSON and CSV conversion
Unit Converter
Data Tools
Convert across length, weight, temperature, data, time
Color Palette Generator
Data Tools
Tints, shades, complements, triadic, export CSS/Tailwind
SVG Optimizer
Image Tools
Minify SVG with SVGO, before/after byte diff
Image Compressor
Image Tools
Compress JPEG/PNG/WebP via Canvas, quality slider
Image Viewer
Image Tools
Preview images with metadata and copyable code
Background Remover
Image Tools
Remove image backgrounds with AI, entirely in your browser
Image Resizer
Image Tools
Resize images to exact dimensions with aspect ratio lock
Image Format Converter
Image Tools
Convert images between PNG, JPEG, WebP, and BMP
Image Cropper
Image Tools
Crop images interactively with aspect ratio presets
Image Filters
Image Tools
Apply grayscale, sepia, blur, brightness, contrast, and more
JWT Analyzer
API Tools
Decode JWT tokens, inspect claims
API Builder
API Tools
Build and test HTTP requests
Mock Generator
API Tools
Generate mock JSON from schemas
cURL Converter
API Tools
Convert cURL to code snippets
Webhook Tester
API Tools
Build and send webhook payloads to any URL, inspect responses with timing
OpenAPI Generator
API Tools
Generate OpenAPI specs
Env Validator
DevOps Tools
Validate .env files
Docker Generator
DevOps Tools
Generate Dockerfiles
Cron Builder
DevOps Tools
Build cron expressions
SQL to Models
Code Generation
Generate models from SQL
DTO Generator
Code Generation
Generate request/response DTOs
Localization Manager
Code Generation
Manage i18n keys
Password Strength
DevOps Tools
Test password strength with zxcvbn scoring and crack-time estimates
IP Subnet Calculator
DevOps Tools
CIDR subnet calculator for IPv4 and IPv6 with usable host ranges
Timezone Converter
DevOps Tools
Convert times between multiple timezones with DST awareness
User Agent Parser
DevOps Tools
Parse User-Agent strings into browser, OS, device, and engine details
Color Palette Extractor
Image Tools
Extract dominant color palette from any image with hex, rgb, hsl
Image Placeholder Builder
Image Tools
Build placeholder image URLs for Lorem Picsum and placehold.co
URL Encoder/Decoder
Text Tools
Encode and decode URLs with component, full-URI, and form-data modes
Character & Word Counter
Text Tools
Count characters, words, lines, reading time, and SMS segments
HTML Entity Encoder/Decoder
Text Tools
Encode and decode HTML entities (named and numeric)
Slug Generator
Text Tools
Generate URL-safe slugs with Arabic transliteration support
YAML ↔ JSON
Text Tools
Convert between YAML and JSON bidirectionally
TOML ↔ JSON
Text Tools
Convert between TOML and JSON bidirectionally
HTML to Markdown
Text Tools
Convert HTML to Markdown with GitHub-flavored output
Regex Builder
Text Tools
Visual regex builder with presets and code generation
Email Validator
Data Tools
Bulk email validator with typo suggestions
Credit Card Validator
Data Tools
Validate credit cards with Luhn check and brand detection
HTTP Status Codes
API Tools
Searchable HTTP status code reference with guidance
Barcode Generator
DevOps Tools
Generate Code128, EAN-13, UPC-A barcodes as PNG or SVG
ASCII Table
Text Tools
Browse ASCII codes 0-127 with hex, octal, binary, and HTML entities
Unicode Finder
Text Tools
Look up Unicode chars by name, codepoint, or glyph
Emoji Picker
Text Tools
Searchable emoji grid with shortcodes (`:smile:` to emoji)
Markdown Table Editor
Text Tools
Visual grid editor that outputs GitHub-flavored Markdown tables
Cron Explainer
Data Tools
Convert cron expressions into plain-English schedules
Number Base Converter
Data Tools
Convert between decimal, binary, hex, octal with bitwise ops
SQL JSON Converter
Data Tools
Convert SQL INSERT statements to JSON rows and back
CSV / TSV Converter
Data Tools
Convert between CSV, TSV, and JSON with RFC-4180 parsing
JSON Schema Generator
Data Tools
Generate a JSON Schema from a sample JSON document
Diff Patch Generator
Data Tools
Generate a unified diff patch from two text inputs
Tailwind ↔ CSS Converter
Code Generation
Translate Tailwind utility classes to CSS and back
Minify Code
Code Generation
Minify JavaScript (terser), CSS, and HTML with size savings
Random Data Generator
Code Generation
Generate fake names, emails, addresses, UUIDs & more
Image EXIF Viewer
Image Tools
Inspect camera, lens, GPS EXIF metadata and strip it on download