Free online converters

Converts JSON to CSV in the browser and states that data is not sent to a server.

Unit converter for length, mass, temperature, currency and many other quantities, installable as a web app.

Unit conversion and calculation tool that accepts natural queries like 'miles to km' and checks dimensions.

Converts pasted or uploaded CSV into JSON.

Converts epoch seconds, epoch milliseconds or date strings to and from readable dates.

Turns pasted JSON into CSV.

Turns pasted JSON into tab-separated values.

Converts JSON to YAML.

Converts numbers between binary, decimal, hexadecimal and other bases.

Creates a QR code from text in three sizes, with an optional centre logo and PNG download.

Paste an epoch number to see the calendar date and time it stands for.

Converts tab-separated values into structured JSON.

Converts XML into JSON.

Converts YAML into JSON.

Converts Markdown to HTML in a side-by-side playground.

Decodes Base64 strings back to text or a downloadable file.

Encodes text or files into Base64 with charset and URL-safe options.

Converts a string into its hexadecimal byte representation.

Converts TOML to JSON in a side-by-side playground.

Converts new-format .xmind mind maps into clean Markdown that you can copy or download.

Exchange rate converter covering 32 currencies.

Batch converts images between formats, up to 50 files, with optional background removal.

Converts between metres, kilometres, feet and miles with a live result in the browser.

Switches images between JPG, PNG, WebP and GIF locally, with no uploads.