devtool

A local-first developer toolkit. Professional-grade tools that run 100% in your browser — no server, no account, no tracking.

| Tool | What it does | |------|-------------| | Smart Detector | Auto-detect input type and route to the right tool | | Data Formatter | Convert raw lists into SQL IN clauses, VALUES, UNION ALL, or CSV | | File Converter | Convert images (PNG/JPG/WebP/BMP/AVIF), structured data (JSON/CSV/TSV/XML/YAML), and File ↔ Base64 with batch queue + ZIP download | | List Cleaner | Deduplicate, sort, trim, and normalize plain-text lists with live unique/dupe counts | | SQL Formatter | Format or minify SQL with dialect support and highlighted parameters | | JSON Tools | Format, minify, auto-repair, diff two payloads, tree view, generate TypeScript interfaces | | Markdown Preview | Live GFM editor with tables, task lists, and syntax-highlighted code blocks | | Stack Trace Formatter | Parse and display .NET/JS/Java/Python/Go/Ruby stack traces with user code highlighting | | Mock Data Generator | Generate fake test data (JSON/CSV/SQL) via faker.js with 60+ field types | | JWT Decode | Decode and inspect JWT tokens with syntax highlighting | | Text Tools | Log Insights pattern builder (CloudWatch) and Jira release note formatter | | Epoch Converter | Convert between Unix timestamps and human-readable dates | | Color Converter | Convert between HEX, RGB, HSL, OKLCH with visual picker and WCAG contrast checker | | Cron Builder | Visual cron expression builder with human-readable descriptions and next 10 run times | | Log Analyzer | Parse, filter, and analyze logs with auto-format detection, level filtering, and timeline view | | Text Compare | Side-by-side diff of two text blocks with line and character-level highlighting | | Diagram Generator | 12 diagram types (flowchart, sequence, C4, ER, class, state, gantt, pie, mindmap, timeline, gitgraph, quadrant) with 27