JSON Minifier
Compress and minify JSON by removing all whitespace. Shrink to a single line and see exactly how many bytes you save.
Free, no signup — runs securely in the browser. The output is always valid, parseable JSON.
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How to Minify JSON Online
Turn formatted JSON into a compact, production-ready single line in three steps.
Paste Your JSON
Drop in a formatted or pretty-printed JSON string — a config file, fixture, or API response.
Minify
Click Minify to strip every space, tab, and newline. You'll see original size, minified size, and bytes saved.
Copy or Download
Copy the compact single-line JSON to your clipboard or download it as a .json file.
// before — 64 bytes
{
"id": 1,
"ok": true
}// after — 21 bytes
{"id":1,"ok":true}
Size Stats
See original size, minified size, bytes saved, and reduction percentage after every minification.
Data Preserved
Only whitespace is removed. All keys, values, and structure remain 100% intact.
Instant Results
Minification happens instantly. Copy to clipboard or download as a .json file.
Frequently Asked Questions
What does the JSON Minifier do?
It removes all unnecessary whitespace, line breaks, and indentation from your JSON to produce the smallest possible valid JSON string — ideal for production payloads and smaller config files.
How much can it reduce the file size?
Results vary depending on how much whitespace the original contains. Typical formatted JSON is reduced by 20–50%, and the tool shows you the exact bytes saved.
Does minifying change the data?
No. Minifying only removes whitespace. All keys, values, arrays, and nesting remain exactly the same, and the output is always valid, parseable JSON.
Is my JSON kept private?
Yes. Minification runs in your browser — nothing is uploaded or stored, so it's safe for API payloads and config files with sensitive values.
Is this free to use?
Yes. The JSON Minifier is completely free with no signup, no login, and no limits.
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