{ } Lossless JSON compression

JSON Minifier

Paste JSON and instantly get one compact line for APIs, configuration, or storage. No server uploads and no value conversion.

Your data stays in the browser Lossless formatting Need readable JSON instead? Open the Formatter →
Indent
Input JSON Paste, type, or drop a .json file
0 characters
Result
Your result will appear here Paste JSON on the left or open the example.
Ready
Result updates while you type

Compact JSON without surprise changes

The minifier removes only insignificant whitespace and line breaks. Long integers, exponent notation, escape sequences, array order, and duplicate keys remain exactly as written.

See the savings instantly

The result updates while you type, and the status bar shows the final byte size and reduction percentage.

Validate before shipping

Invalid JSON never gets silently minified: errors identify the exact line, column, and nearby source.

Production-ready output

Copy the single line, download a .json file, or inspect the tree before using the result.

Keyboard shortcuts ⌘/CtrlEnter Format ⌘/CtrlShiftM Minify ⌘/CtrlShiftC Copy result

This free JSON Minifier removes spaces, indentation, and line breaks to reduce payload size for APIs, configuration files, logs, and storage. Processing stays entirely in the browser; source values are never uploaded or converted through JavaScript Number.