Input (Formatted)
Output (Minified)
click Minify to compress

JSON Minifier — Free Online JSON Compressor

Compress JSON by removing all whitespace. Part of the free JSON Formatter Online toolkit.

JSON minification removes all unnecessary whitespace — spaces, tabs, and newlines — producing the smallest possible valid JSON string. The data is identical when parsed; only the representation shrinks. This is critical for reducing API response payload sizes, shrinking config files before storage, and lowering network transfer costs.

Paste your formatted JSON into the left panel and click Minify. The right panel shows the compressed output; the toolbar displays original size, minified size, and percentage saved. Download as a .json file or copy to clipboard. Need to re-read the output? Go back to the pretty JSON formatter to beautify it again.