| Key features | - JSON formatter, validator, and converter to YAML, CSV or TypeScript
- JWT decoder for inspecting token header, payload and expiry
- QR code and barcode generator with custom colors and download options
- Image compressor for batch processing to WebP, JPEG or PNG with quality slider
- curl converter between curl, fetch, axios, Python, Go, Node and PHP
- Hash generator supporting MD5, SHA-1, SHA-256, SHA-384, SHA-512
- Cron expression builder and parser with next run times
- JSON diff tool with structural comparison and collapsible tree
- SQL formatter and dialect converter for MySQL, PostgreSQL, SQLite and SQL Server
- Certificate decoder for PEM certificates, chains and CSRs with SANs and fingerprints
| - Server matrix showing which MCP servers are enabled across all supported AI clients
- Health checks and MCP Doctor to diagnose server connection failures
- Profiles to save and switch between different MCP stacks for different tasks
- Timestamped backups with atomic writes and external change detection
- Contract Guard to alert when servers change their tool definitions or descriptions
- Built-in catalog and support for custom JSON, JSONC and TOML configuration sources
- Context optimizer measuring tool-schema footprint and proximity to client limits
- Security scanning for invisible characters, credential exposure and malicious prompts in tool definitions
- Optional Gateway mode for supported stdio servers with local routing and native credential storage
- Live Activity logging with metadata-only recording and no payload capture
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| What makes it different | - All tools run client-side in your browser with no data uploads to servers
- Fast static site served from global edge network with no sign-up required
- Clean interface available in 10 languages with dark mode and keyboard shortcuts
- Free to use forever with non-intrusive ads never accessing tool data
- Built as static Next.js export preventing server-side processing of sensitive data
| - Works with any existing MCP server you already have configured without requiring migration or special catalog registration
- Detects and alerts when servers change what they tell your model between health checks
- Completely local with no cloud sync, no account, and no upload of configuration or API keys
- Public source code under MIT License so you can audit every request or build from source yourself
- Automatic timestamped backups before every change with the ability to browse and restore earlier versions
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KyttoMCP