Does minifying change the data?

No. The parsed result is identical — same keys, same values, same order. Only whitespace between tokens is removed, and whitespace inside a string is left alone because it is part of the value.

Is it worth it if my server uses gzip?

Less than the raw numbers suggest, because compression already handles repeated whitespace well. It still helps where the bytes are stored rather than sent: database columns, caches, log lines.

Can I get the formatted version back?

Yes. Minifying is reversible because nothing is lost. The JSON Formatter re-indents it, though it cannot restore your original choice of indent width, since that was never part of the data.

Does it remove comments?

JSON has no comments to remove. If your file contains them it is not JSON, and it will be rejected rather than silently stripped.

JSON Minifier

Strips every byte of whitespace a JSON document does not need, and reports what that saved — without changing a single value.

Runs in your browser — nothing is uploaded

Your JSON

0 characters0 words0 lines0 B

Try:

Indentation

Sort keys A–ZUseful for diffing two payloads

Shortcut: Ctrl + Enter to format, Ctrl + Shift + K to clear.

Result

Your formatted JSON appears here

Everything runs in your browser — nothing you paste is uploaded or stored on a server.

Need this as an API?

Why use it

Built to be genuinely useful

Values are untouched

Whitespace inside strings is content and is preserved exactly. Only the whitespace between tokens is removed.

Reports the real saving

The size before, the size after, and the difference — measured in bytes rather than characters, because that is what a network transfers.

Nothing is uploaded

It runs in your browser. Tokens, keys and customer data routinely end up in these tools, and none of it should have to cross a network to be decoded.

Free, no sign-up

No account, no daily cap, and no feature held back behind a paywall.

How it works

Three steps

1
Paste the JSON.
2
Minify.
3
Copy or download the result.

How much this actually saves

Pretty-printed JSON is typically 15–30% whitespace, and deeply nested documents are worse because every level adds indentation to every line inside it. On a payload sent thousands of times a day that is real bandwidth.

It is worth putting next to compression, though. Gzip and Brotli handle repeated indentation extremely well — whitespace is the most compressible thing in the document — so over a compressed connection the saving from minifying is much smaller than the raw byte count suggests. Where minifying still clearly wins is anywhere the bytes are stored rather than transferred: a database column, a cache entry, a log line.

When not to minify

Configuration files that people edit are worse minified, and the bytes saved are irrelevant on a file loaded once at startup. The same goes for anything kept in version control: a minified document is one long line, so every change shows as the whole file changing and a diff tells you nothing.

The useful rule is to minify what machines read and leave formatted what people read. A build step that minifies on the way out gives you both without having to choose.

FAQ

Questions people ask

API access

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