JSON Minifier
Compress JSON by removing whitespace — see before/after size instantly. Runs in your browser — nothing is sent to a server.
Why Minify JSON?
Minifying JSON removes all unnecessary whitespace — spaces, tabs, and newlines — without changing the data. This reduces file size and speeds up network transfers, which matters for APIs, configuration files served over HTTP, and embedded data payloads.
A typical prettified JSON file is 30–70% larger than its minified equivalent. For high-traffic APIs this adds up quickly.
Minify vs Compress
Minification
Removes whitespace at the text level. The result is still human-readable JSON — just on one line. No special decoder needed.
Compression (gzip/brotli)
Applied at the HTTP transport layer by your web server. Works best on top of already-minified JSON. Not human-readable without decompression.
Specifications
- Accepts
- Text — type or paste
- Gives you
- copy to clipboard
- Where it runs
- Your browser — the file is never uploaded
- Sign-up
- None
- Cost
- Free, with no usage limits
FAQ
Is my JSON data sent to a server?
No. Minification happens entirely in your browser. Your data never leaves your device.
Does minification change the data?
No. Minification only removes whitespace characters. Keys, values, and structure remain identical.
What is the size reduction shown?
The badge shows the byte sizes before and after, and the percentage saved. Savings vary based on how much whitespace the original has.
Can I minify invalid JSON?
No. The tool validates JSON before minifying. If your input has syntax errors the error will be shown below the input.