Data Conversion Tools — JSON, CSV, XML, YAML & Markdown
Convert between JSON, CSV, XML, YAML, Markdown, and HTML — all client-side. 100% free and private — everything runs directly in your browser, nothing is ever uploaded to a server.
All Data Tools (9)
Data Format Conversion Tools
Data format conversion is one of the most common tasks in software development and data analysis. APIs return JSON, spreadsheets expect CSV, configuration files use YAML or XML, and documentation is written in Markdown. Moving data between these formats manually — copying values, adjusting syntax, escaping special characters — is tedious and error-prone. Automated converters handle the structural transformation instantly while preserving data integrity.
JSON (JavaScript Object Notation) has become the dominant data interchange format on the web, but it is not universally ideal. CSV is better for tabular data that needs to be opened in Excel or Google Sheets. XML remains the standard in enterprise systems, SOAP APIs, and document formats like SVG and RSS. YAML is preferred for human-editable configuration files because of its clean, indentation-based syntax. Being able to convert fluently between all of these formats is a practical necessity.
Markdown and HTML conversion bridges the gap between writing and publishing. Technical writers, bloggers, and documentation authors write in Markdown because it is fast and readable as plain text, but web pages require HTML. Converting Markdown to HTML produces clean, semantic markup ready for publishing. The reverse — HTML to Markdown — is useful when you want to extract content from a web page into a format that is easier to edit and version-control.
Privacy matters when converting data. Developers routinely paste API responses, database exports, configuration files, and internal documentation into online converters. If those converters upload the data to a server for processing, sensitive information — API keys, user records, internal endpoints — is exposed to a third party. Browser-based converters eliminate this risk entirely: the data never leaves your device, and the conversion runs in JavaScript within your browser tab.
Frequently Asked Questions
Will converting JSON to CSV lose any data?
For flat JSON arrays (arrays of objects with simple key-value pairs), the conversion is lossless — every value maps to a CSV column. For nested JSON objects, the converter flattens them using dot notation (e.g., address.city becomes a column header). Deeply nested arrays may be serialized as comma-separated strings within a quoted CSV field. For complex structures, review the output to confirm the flattening meets your needs.
Does the YAML to JSON converter support all YAML features?
The converter handles the most commonly used YAML features: key-value pairs, nested objects, arrays, strings (quoted and unquoted), numbers, booleans, null, comments, and basic multi-line strings. Advanced YAML features like anchors, aliases, and custom tags are not supported in this browser-based implementation.
Can the Markdown to HTML converter handle code blocks?
Yes. Fenced code blocks (triple backticks) are converted to <pre><code> elements. If a language is specified after the opening backticks, it is added as a CSS class on the <code> element for syntax highlighting integration. Inline code (single backticks) is converted to <code> elements.
Is my data sent anywhere during conversion?
No. All data conversions run entirely in your browser using JavaScript. Whether you are converting sensitive API responses, database exports, or configuration files, the data never leaves your device. There is no server-side processing, no logging, and no data retention.