Free File Converter Tools – CSV to JSON, HTML to Markdown & JSON to Excel
Data format mismatches between spreadsheets, APIs, and documentation tools are a constant friction point in technical workflows. CSV-to-JSON converts flat table data for API testing and JavaScript use. HTML-to-Markdown strips formatting for content migration and documentation workflows. JSON-to-Excel exports structured API data for stakeholder reporting in a format non-technical teams can work with.
CSV to JSON Converter
Convert CSV files to JSON format online free - no login. Paste or upload a CSV and instantly get a clean, formatted JSON array. Supports headers, custom delimiters, and download.
HTML to Markdown Converter
Convert HTML code to Markdown format online free - no login. Paste raw HTML and get clean, readable Markdown output instantly. Supports headings, links, lists, bold, and images.
JSON to Excel Converter
Convert JSON data to Excel spreadsheet online free - no login. Paste a JSON array and download a formatted .xlsx file instantly, with automatic column headers from object keys.
How to use these tools
Select the tool that matches your task, open it, and follow the steps below.
- Find the tool that matches your task - for example: CSV to JSON Converter, HTML to Markdown Converter, JSON to Excel Converter.
- Open it and enter your input - no file upload, account, or install required.
- Use the result directly in your workflow, or move to a related tool for the next step.
Common ways to use these tools
- File Tools are most useful when you already know the task and want a fast result.
- Each tool in this category handles one specific job well rather than trying to be a general-purpose suite.
- Most workflows in this area involve two or three steps - use related tools in the same category to complete the full sequence.