- Home
- Code Obfuscation Software
- JavaScript Obfuscator
JavaScript Obfuscator
What it is
JavaScript Obfuscator transforms JavaScript into code that is harder to understand, with the aim of protecting source code. Standard obfuscation runs in the browser and is free without usage limits. Its transformations include renaming variables, extracting and encrypting strings, adding dead code and flattening control flow. Paid plans add REST API and npm integration for VM obfuscation, which converts function bodies into custom bytecode executed by an embedded JavaScript virtual machine. Paid plans can also process HTML containing marked inline JavaScript while retaining the surrounding HTML structure. Basic JavaScript processing occurs in the browser; VM and HTML requests are handled on the service's servers and discarded afterward. The project lists integrations for build tools including Webpack, Esbuild, Gulp, Grunt, Rollup, Netlify, Snowpack and Vite. Output targets Node.js and evergreen desktop browsers, as well as iOS 16 and later; older browsers are supported on a best-effort basis. TypeScript and JSX should be compiled to JavaScript first, and projects should be bundled before processing. The documentation cautions that obfuscation is not encryption and can make code slower and files larger.
For and against
For
- Standard obfuscation runs in-browser for free without usage limits.
- Includes variable renaming and control-flow flattening.
- Paid plans add REST API and npm integration.
- Lists integrations for multiple build tools.
Against
- Obfuscation is not encryption.
- Obfuscated code can be slower and files larger.
- TypeScript and JSX need compilation before obfuscation.
The verdict
JavaScript Obfuscator provides free browser-based transformations and paid VM and HTML processing options. It is a code-hardening tool, not encryption, and the documentation notes potential performance and file-size costs.
Who it suits
It suits JavaScript developers who want to make frontend source code harder to read or integrate obfuscation into a build process. Users handling secrets should note the documentation's warning not to store them in frontend code.
Plans and prices
Free
25 MB lifetime VM quota · 4 MB VM file size limit · Unlimited standard obfuscation
Read 30 Sep 2026 · obfuscator.io
Pro
100 MB/month VM quota · 30 MB/day · 4 MB VM file size limit · Up to 10 files
Read 30 Sep 2026 · obfuscator.io
Team
500 MB/month shared VM quota · 150 MB/day/member · Up to 5 members · 7 MB VM file size limit
Read 30 Sep 2026 · obfuscator.io
Business
2.5 GB/month shared VM quota · 600 MB/day/member · Up to 15 members · 10 MB VM file size limit
Read 30 Sep 2026 · obfuscator.io
On the record
- API integration
- Pro, Team, and Business plans provide REST API access and npm package integration for VM obfuscation.obfuscator.io · read 30 Sep 2026
- Browser processing
- Standard obfuscation runs entirely in the browser and is free without usage limits.obfuscator.io · read 30 Sep 2026
- Build integrations
- The project lists plugins and integrations for Webpack, Esbuild, Gulp, Grunt, Rollup, Weex, Malta, Netlify, Snowpack, and Vite.github.com · read 30 Sep 2026
- Core features
- The package provides variable renaming, string extraction and encryption, dead-code injection, control-flow flattening, and other code transformations.github.com · read 30 Sep 2026
- HTML support
- Paid plans can obfuscate HTML files containing marked inline JavaScript while preserving the surrounding HTML structure.obfuscator.io · read 30 Sep 2026
- License
- The open-source package is distributed under the BSD-2-Clause license.github.com · read 30 Sep 2026
- Performance limit
- The repository warns that obfuscated code can be 15% to 80% slower and files significantly larger depending on options.github.com · read 30 Sep 2026
- Privacy
- The service states that VM and HTML requests are processed on its servers and discarded after processing, while basic JavaScript obfuscation runs in the browser.obfuscator.io · read 30 Sep 2026
- Purpose
- JavaScript Obfuscator transforms JavaScript into harder-to-understand code to protect source code.github.com · read 30 Sep 2026
- Runtime defenses
- VM Self Defending detects integrity changes and hooks, while VM Debug Protection detects developer tools, breakpoints, and runtime inspection.obfuscator.io · read 30 Sep 2026
- Runtime support
- The output targets Node.js and supports evergreen desktop browsers plus iOS 16 and later, with older browsers supported only on a best-effort basis down to ES2015 modules.obfuscator.io · read 30 Sep 2026
- Security limitation
- The documentation says obfuscation is not encryption and advises against storing API keys, secrets, or credentials in frontend code.obfuscator.io · read 30 Sep 2026
- Source requirements
- TypeScript and JSX should be compiled to JavaScript before obfuscation, and projects should be bundled before processing.obfuscator.io · read 30 Sep 2026
- VM protection
- Obfuscator.io compiles function bodies into custom bytecode executed by an embedded JavaScript virtual machine.obfuscator.io · read 30 Sep 2026
