WebAuthn / Passkey Test Tool - Browser-Side Registration and Authentication Inspector | hidekazu-konishi.com

GraphQL Query Builder and Formatter Tool - SDL-Driven Query Generator and Validator | hidekazu-konishi.com

Password Strength Checker Tool - Entropy, Crack Time, and zxcvbn-based Password Diagnostic | hidekazu-konishi.com

Line Ending / BOM Converter Tool - Free Online CRLF LF CR Newline and UTF-8 BOM Converter | hidekazu-konishi.com

Character Encoding Converter Tool - Japanese Encoding Conversion and Mojibake Repair | hidekazu-konishi.com

SVG Optimizer Tool - Free Online SVG Cleaner and Minifier | hidekazu-konishi.com

PDF Text Extractor and Search Tool - Extract Text from PDF with Page Range and In-Browser Search | hidekazu-konishi.com

S3 Bucket Policy Generator Tool - Visual Builder and Linter for AWS S3 Bucket Policies | hidekazu-konishi.com

CSV Preview and Statistics Tool - In-Browser CSV Profiler with Type Inference and Histograms | hidekazu-konishi.com

Mermaid Diagram Live Editor Tool - Real-time Flowchart, Sequence, ER, and AWS Architecture Diagram Editor with SVG and PNG Export | hidekazu-konishi.com

API Request / curl Command Builder - Multi-Language HTTP Code Generator (curl, fetch, axios, requests, Go) | hidekazu-konishi.com

JSONPath / JMESPath Query Tester Tool - Real-Time JSON Query Evaluator for AWS CLI --query | hidekazu-konishi.com

Markdown Table Visual Editor Tool - Spreadsheet-style GFM Table Builder with CSV/TSV/JSON Import | hidekazu-konishi.com

Image Format Converter Tool - Client-Side HEIC WebP AVIF JPG PNG GIF BMP Batch Converter | hidekazu-konishi.com

HTTP Security Header Analyzer Tool - CSP HSTS X-Frame-Options Audit with Grade and Recommendations | hidekazu-konishi.com

Email Header Analyzer Tool - Received Chain, SPF/DKIM/DMARC, and Authentication-Results Inspector | hidekazu-konishi.com

DKIM / SPF / DMARC Record Builder and Validator - Email Authentication DNS TXT Record Generator | hidekazu-konishi.com

SSL/TLS Certificate Decoder and Chain Inspector - X.509 PEM/DER Viewer | hidekazu-konishi.com

AWS Step Functions Distributed Map - Practical Patterns and Pitfalls for Large-Scale Parallel Workloads | hidekazu-konishi.com

EventBridge Pipes Event-Driven Architecture Implementation Patterns | hidekazu-konishi.com