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Free Online Converters

Convert units, file formats, and data structures.

A fast set of converters covering the units and formats you need every day — from temperature and currency to CSV, JSON, and Markdown transformations.

Problems converter tools solve

  • Turning a spreadsheet export (CSV) into JSON for an API payload
  • Converting Markdown drafts into clean HTML for a CMS
  • Switching temperatures between Celsius, Fahrenheit, and Kelvin
  • Moving between metric and imperial length, weight, and volume units
  • Exporting JSON data back to CSV for stakeholders who prefer Excel
  • Getting consistent unit conversions for recipes, travel, or DIY projects

Recommended converter tools

Our most-used tools in this category — start here.

CSV to JSON

Turn spreadsheets into API-ready JSON with header detection

JSON to CSV

Flatten JSON arrays into CSV your team can open in Excel

Markdown to HTML

Preview and copy clean HTML from Markdown drafts

Temperature Converter

Instant C/F/K conversions with formula shown

Length Converter

Metric and imperial length conversions with high precision

Popular tools

Try our most-used tools

Merge PDFRemove BackgroundJSON Formatter

All converter tools (9)

Length Converter

Meters, feet, inches, miles.

Weight Converter

Kilograms, pounds, ounces, tons.

Temperature Converter

Celsius, Fahrenheit, Kelvin.

Speed Converter

km/h, mph, m/s, knots.

Area Converter

Square meters, acres, hectares.

Volume Converter

Liters, gallons, ounces.

CSV to JSON

Parse CSV into JSON.

JSON to CSV

Flatten JSON arrays into CSV.

Markdown to HTML

Render Markdown as HTML.

Who uses converter tools?

  • Developers transforming data between formats
  • Data analysts preparing datasets for import
  • Technical writers converting docs between Markdown and HTML
  • Engineers and scientists working across unit systems
  • Travelers and expats converting units on the fly
  • Students checking homework conversions

Read more on the blog

Tutorials and guides about converter tools.

How to Convert CSV to JSON Easily

The Best Free Unit Converters Online

How to Convert Word to PDF

How to Convert JPG to PDF

Frequently asked questions

Yes. All formulas are based on SI standards and up-to-date reference values. Temperature, length, weight, and volume conversions match NIST-published constants to full double-precision accuracy.
The parser follows RFC 4180 — quoted fields containing commas, newlines, or escaped quotes are handled correctly. If your file uses a different delimiter (semicolon, tab), you can change it in the options.
Yes. Tables, fenced code blocks, task lists, strikethroughs, and autolinks all convert correctly. The output is clean, semantic HTML you can paste into any CMS.
Nested objects are flattened using dot-notation column names (user.name, user.address.city), and arrays are either expanded into rows or joined into a single cell based on your setting. Very deep or ragged structures may need manual mapping.
Yes — unit converters are pure math that runs entirely in your browser. Once the page has loaded, you can disconnect and keep converting values with zero delay.
Usually an encoding mismatch — CSVs saved from Excel are often Windows-1252 or UTF-16, while the tool expects UTF-8. Re-save the file as UTF-8 in Excel (Save As → CSV UTF-8) and the characters will display correctly.

Your files never leave your device

Every tool on Xevon Tools runs 100% in your browser. No uploads, no servers, no tracking. Free forever.

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