Loading…
About JavaScript Formatter
JavaScript Formatter — free, private, browser-based dev tool
Pretty-print or minify JS/TS — consistent indent, smart line breaks. It runs in your browser, so the file is processed on your own device.
Why use JavaScript Formatter
- ·Files stay on your device — nothing is uploaded
- ·No signup needed
- ·Works in any modern browser, on any OS
- ·Free daily use; Pro removes limits and watermarks
How to use it
- 1Drop a text file on the page, or click to choose one.
- 2Pick the options you want.
- 3Copy or save the result.
What JavaScript Formatter does
Pretty-print or minify JS/TS — consistent indent, smart line breaks.
How it works
SubtleCrypto for SHA/HMAC/AES, WebAssembly for BLAKE3 / Argon2 / scrypt, and crypto.getRandomValues for entropy. The processing code runs inside the page, so your file is not uploaded to a server — you can confirm this in your browser's DevTools → Network tab.
Frequently asked questions
Does JavaScript Formatter upload my files?+
No. JavaScript Formatter runs in your browser and processes the file on your device. Nothing is sent to our servers.
Is JavaScript Formatter free?+
Yes, with a daily free allowance and no signup. Xonvert Pro ($4.99/month) removes the daily limits and the watermark on exported files.
Do I need to install anything?+
No. It works in any modern browser on Windows, macOS, Linux, ChromeOS, Android and iPad.
Related dev tools
Base64
Encode and decode Base64 — UTF-8 safe, two-way.
JSON Formatter
Format, minify, and validate JSON. Drag a file or paste a blob.
UUID Generator
Generate UUIDv4 / v7 identifiers in bulk — cryptographically random.
Hash Generator
MD5, SHA-1, SHA-256, SHA-384, SHA-512 — instant cryptographic hashes.
Slug Generator
Turn a title into a clean URL slug — Unicode-safe transliteration.
Lorem Ipsum
Generate placeholder text — words, sentences, or paragraphs.