Web Tools Collection | hidekazu-konishi.com

Welcome to my collection of web tools!
Here you'll find various utilities, converters, generators, and productivity tools I've developed to solve common problems and streamline everyday tasks. All tools are free to use and work directly in your browser without requiring any installations or downloads.
Each tool is designed with simplicity and functionality in mind, focusing on providing immediate value for specific use cases. Whether you're a developer, content creator, or simply someone looking for handy utilities, you'll find these tools helpful for your specific needs.

Disclaimer: These tools are provided "as is" without warranties. Use at your own risk. Results may utilize third-party services and should be verified independently. By using these tools, you accept full responsibility for any outcomes. For more details, please refer to our Web Tools Disclaimer.

Available Web Tools

First Published:
Last Updated:

  1. Typing Speed Test and Practice Tool - WPM Test, Code Typing with Keystroke Heatmap
  2. Image to PDF Converter Tool - Convert Multiple Images to PDF with Smart Layout
  3. Barcode Generator Tool - Multi-Format 1D Barcode Creator with Batch Generation
  4. Image Watermark Tool - Add Text and Logo Watermarks to Photos with Batch Processing
  5. Digital Signature Pad Tool - Handwriting Signature Creator with PDF Signing
  6. Chart Graph Maker Tool - Interactive Data Visualization and Chart Creator
  7. Code Screenshot Generator Tool - Beautiful Code to Image Converter with Syntax Highlighting
  8. OG Image Generator Tool - Open Graph and Social Card Image Creator
  9. JSON to Type Generator Tool - Multi-Language Type Definition Generator with Smart Inference
  10. JSON Schema Generator Validator Tool - Multi-Sample Schema Inference with Format Detection
  11. JSON Diff Tool - Structural JSON Compare with JSONPath and RFC 6902 Patch
  12. Markdown Live Editor Tool - Real-time GFM Editor with Live Preview and Syntax Highlighting
  13. Schema.org JSON-LD Generator Tool - Structured Data Markup Generator with Google Rich Results Preview
  14. Color Palette Generator Tool - Harmony-Based Palette Creator with Image Extraction and Contrast Matrix
  15. PDF to Image Converter Tool - Convert PDF Pages to PNG JPEG WebP with DPI Control
  16. IP Subnet Calculator Tool - CIDR VLSM IPv4 IPv6 Network Calculator
  17. XML Formatter Validator Tool - Online XML Beautifier with XPath Tester and Tree Viewer
  18. PDF Merge Split Tool - Combine Split and Extract PDF Pages Online
  19. Image EXIF Metadata Viewer and Remover Tool - Privacy-Focused Photo Metadata Analyzer with GPS Map and Lossless Stripping
  20. Image Compressor Tool - Client-Side Image Compression Resizing and Format Conversion
  21. Favicon App Icon Generator Tool - Complete Favicon Package with ICO PNG and PWA Icons
  22. CSS Gradient Generator Tool - Linear Radial and Conic Gradient Maker with Multi-Layer Support
  23. Meta Tag OGP Generator Tool - Open Graph Twitter Card and Meta Tag Generator with Live Preview
  24. Number Base Converter Tool - Binary Decimal Hex Octal Converter with Bit Visualization
  25. CSV JSON Converter Tool - CSV to JSON and JSON to CSV Online Converter
  26. Lorem Ipsum Generator Tool - Multi-Style Dummy Text and Placeholder Content Generator
  27. HTML Entity Encoder Decoder Tool - Encode Decode and Reference HTML Special Characters
  28. SQL Formatter Tool - Online SQL Beautifier Minifier and Syntax Highlighter
  29. Chmod Permission Calculator Tool - Unix File Permission Calculator with Umask Support
  30. Word Character Counter Tool - Free Online Text Analyzer with Reading Time and Keyword Density
  31. URL Encoder Decoder Tool - Multi-Mode URL Encoding and Decoding with URL Parser
  32. Color Converter and WCAG Contrast Checker Tool - HEX RGB HSL Converter with Accessibility Testing
  33. Cron Expression Parser and Builder Tool - Schedule Generator with Next Run Times
  34. Diff Text Compare Tool - Free Online Side-by-Side Text Difference Checker
  35. Regex Tester Tool - Online Regular Expression Tester and Explainer
  36. JWT Encoder Tool - JSON Web Token Generator and Signer
  37. JWT Decoder Tool - JSON Web Token Inspector and Debugger
  38. YAML JSON Converter Tool - Bidirectional YAML and JSON Online Converter
  39. QR Code Generator and Reader Tool - Create and Scan QR Codes Online
  40. UUID ULID Generator Tool - Generate and Decode UUID v4, v7 and ULID
  41. JSON Formatter Validator Tool - Online JSON Beautifier Minifier and Tree Viewer
  42. Text Case Converter Tool - Free Online Text Transformation and Case Changer
  43. Unix Timestamp Converter Tool - Epoch Time and Date Converter with Timezone Support
  44. Base64 Encoder Decoder Tool - Text and File Base64 Encoding with Data URI Support
  45. Password Generator Tool - Secure Random Password and Passphrase Generator with Strength Checker
  46. Hash Generator Tool - Multi-Algorithm Hash Calculator with File Support
  47. Markdown HTML Converter Tool - Client-Side Parser and Free Online Converter
  48. JavaScript CSS Minifier Tool - Free Online Code Minification and Compression
  49. IP Range to CIDR Converter Tool - Free Online Network Calculator
  50. AES Encryption Decryption Tool - Client-Side Crypto Cipher and Free Online Encryptor Decryptor
  51. Free Website Speed Test Tool - Lighthouse and PageSpeed Insights Analysis

References:
Tech Blog with curated related content

Written by Hidekazu Konishi