JSON Compactor - Remove Whitespace from JSON

Compact JSON by removing all whitespace. Convert pretty-printed JSON to single-line format. Browser-based, instant processing.

Pretty JSON

Compacted JSON

Frequently Asked Questions

It removes all unnecessary whitespace, indentation, and line breaks while keeping the JSON valid. The output is a single line.

Essentially yes. JSON minification is just whitespace removal since there are no comments in JSON.

Yes. Compacted JSON is 100% equivalent to the original. Only formatting changes.

Yes. Processing happens in your browser. No data is sent anywhere.

Depends on original formatting. Heavily indented JSON can be 50%+ smaller after compacting.

This tool handles standard JSON only. For JSON with comments, use a JSON5 converter first.

Yes. Invalid JSON will show an error. The output is always valid if processing succeeds.

Process one file at a time. For batch processing, copy and paste each JSON document sequentially.

Unicode characters are preserved exactly. The compactor only removes whitespace, not content.

Browser memory limits apply. Files up to 10-20MB compact quickly. Very large JSON may be slow or fail.