Online Obfuscator · The original, since 2004

The best JavaScript obfuscator, right in your browser.

Paste code, pick a preset, and obfuscate. Use Standard for quick protection, Balanced for more coverage, and Maximum when the code matters most. The engine is verified daily against 60+ real-world libraries, and JSO AI can suggest the right preset and pre-check compatibility before you protect. Move into the desktop app for batch work and larger projects.

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Online Preview

Try a preset, tune exclusions, and compare the output before you move into release workflows.

This page is optimized for fast evaluation. Paste or upload a file, review the transformed shape, and switch to the desktop app or automation docs once the preset is dialed in.

Source: 0 KB Result: 0 KB

1Paste or upload 2Pick a preset 3Review output and exclusions 4Copy, download, or move to desktop

input.js

Use this left pane for source code or uploaded .js / .txt files. The online preview is best for smaller validation runs before you batch or automate.

protected.js

Copy

Protected output appears here after you obfuscate. Copy it for a quick review or download it once the output shape looks right.

Standard Options

Browser-safe formatting and naming controls.

Safe defaults

Keep Linefeeds
Keep Indentations
Encode Strings
Move Strings
Replace Names

Advanced Transforms

Premium feature preview. Limited to 2 KB samples on this page.

2 KB preview

Desktop-only transforms remain visible here so you can compare the full option set before moving into the full app.

Variable Exclusion

Regex per line. Names matching any pattern are kept.

Regex keep rules

Use one pattern per line for public APIs, framework hooks, or names that should stay stable across builds.

Workflow Links

Keep moving once the preview looks right.

Next steps

How code is handled. Submitted code generates your protected result; uploaded files are read into the editor and the temporary upload file is removed after completion. For policies that require fully local handling, use the desktop app.