Data conversion that never leaves your browser
Convert between 30+ formats — CSV, JSON, XML, SQL, Markdown, Excel. 100% local processing, zero uploads, no sign-up, free forever.
100% Local
Every conversion runs on your device
Zero Uploads
Files never sent to any server
Free Forever
No sign-up, no limits, no watermark
Unlike most online converters, ConvTop never uploads your files. Processing happens entirely in your browser, so sensitive data — spreadsheets, configs, SQL exports — never leaves your device.
Popular converters
Start with the tools developers use most
Browse all tools
Search and explore the full toolbox
Markdown to Excel
HOTConvert Markdown tables to Excel files with formatting support
XML to JSON
HOTConvert XML data to JSON format with customizable formatting options
CSV to Excel
HOTConvert CSV files to Excel format with full editing capabilities
HTML to Excel
Convert HTML tables to Excel files with full editing capabilities
JSON to Excel
HOTConvert JSON arrays to Excel files with full editing capabilities
JSON to CSV
HOTConvert JSON arrays to CSV format with customizable delimiters
JSON to XML
Convert JSON data to XML format with customizable root element
XML to Excel
Convert XML tables to Excel files with full editing capabilities
SQL to Excel
HOTConvert SQL INSERT statements to Excel files with full editing capabilities
MySQL to Excel
Convert MySQL query results to Excel files with full editing capabilities
LaTeX to Excel
Convert LaTeX tables to Excel files with full editing capabilities
MediaWiki to Excel
Convert MediaWiki tables to Excel files with full editing capabilities
About ConvTop
ConvTop is a free, privacy-first suite of data conversion and developer tools. Every tool runs entirely in your browser using client-side JavaScript — your files are never uploaded, never stored, and never shared.
From JSON to CSV and Markdown tables to Excel, to PDF utilities and developer helpers, each tool is built to be fast, accurate, and private. No accounts, no queues, no watermark.
ConvTop also speaks the language of AI agents: 33 core tools are registered via Web MCP (document.modelContext), so WebMCP-capable browsers and AI assistants can call conversions, hashing, and formatting directly as typed functions — no page scraping required.
Ready to convert?
Pick a tool, paste your data, and it's done — privately, instantly, free.