JSON Minifier
Strip every unnecessary byte from your JSON.
Runs entirely in your browser — your data is never uploaded to any server.
How it works
- Paste your JSONFormatted or already compact.
- Minify itAll redundant whitespace is removed.
- Copy the resultSee exactly how many bytes you saved.
What this tool does
- Reports original size, new size and bytes saved
- Validates while minifying, so broken JSON is caught
- Output is byte-for-byte equivalent data
- Completely local
Frequently Asked Questions
No. Only whitespace between tokens is removed — every key and value is preserved exactly.
Typically 15–30% for indented JSON. Deeply nested structures save the most.
Yes, paste the result into the JSON Formatter to expand it again.
For payloads over the wire, yes — although gzip or brotli compression already removes most of that overhead.
Privacy and security
Your input is processed by JavaScript running inside your browser. Nothing you paste is sent over the network, logged, or stored — which is what makes this safe to use with production data. If you want to check this yourself: open your browser’s developer tools, switch to the Network tab, and use the tool — you will see no request carrying your file or input leave the page.
Related tools
View all tools →JSON FormatterTurn unreadable JSON into properly indented, readable structure.JSON BeautifierExpand minified JSON into something a human can actually read.JSON ValidatorCheck whether your JSON is valid, and find out exactly why it is not.JavaScript FormatterFormat JavaScript to a clean, consistent style.HTML FormatterClean up messy HTML markup.