Obfuscator.io

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What Obfuscator.io is

Obfuscator.io transforms JavaScript into code that is harder to read, including custom bytecode run by an embedded JavaScript virtual machine. Standard obfuscation runs in the browser and is free without usage limits; the playground says submitted code stays on the device. VM obfuscation adds defenses such as integrity checks, hook detection, breakpoint neutralization, and environment fingerprinting. Developers can select functions for VM treatment using comments and a configuration mode. The service offers REST API and npm package access, and its API can be used from build runners such as GitHub Actions, GitLab CI, and Jenkins. Teams can share presets and service tokens and keep versions and presets consistent across builds. The Free plan costs nothing, with unlimited standard obfuscation, a 25 MB lifetime VM quota, and a 4 MB VM file limit. Pro costs $19 a month, Team costs $59 a month, and Business costs $149 a month. The maker cautions that obfuscation is not encryption or a guarantee against reverse engineering. VM output may not work with all code or runtime environments, and users are required to test it before production.

Who it suits

It suits developers who want to make JavaScript harder to read and integrate obfuscation into build workflows. Teams can use shared presets and service tokens, subject to the service's use restrictions.

What it does well

Unlimited standard obfuscation is free.
VM obfuscation includes anti-tamper defenses.
Offers REST API and npm package access.
Teams can share presets and service tokens.
Supports multiple browser and server targets.

What to know first

Free VM quota is 25 MB lifetime.
Free VM file limit is 4 MB.
Obfuscation is not encryption or a reverse-engineering guarantee.
VM output may not work with all code or environments.

Limits

The Free plan has a 25 MB lifetime VM quota and a 4 MB VM file-size limit, while standard obfuscation is unlimited. VM output can be incompatible with some code or runtime environments and should be tested before production use.

Plans

Plan	Billed and limits	Price
Free	25 MB lifetime VM quota · 4 MB VM file size limit · unlimited standard obfuscation	Free
Business	billed monthly · 2.5 GB/month shared VM quota · 600 MB/day per member · up to 15 members · 10 MB VM file size limit · priority support	$149 a month
Pro	billed monthly · 100 MB/month VM quota · 30 MB/day · API access (REST + npm package) · up to 10 files per batch · HTML files with inline JS	$19 a month
Team	billed monthly · 500 MB/month shared VM quota · 150 MB/day per member · up to 5 members · 7 MB VM file size limit · flexible version pinning	$59 a month

As obfuscator.io lists them, read 29 Sept 2026. The maker's own page has the final word.

Getting started

Open https://obfuscator.io/ in a browser for standard obfuscation.
Compile TypeScript and JSX, and bundle the application before obfuscating it.
For HTML input, use the HTML parsing option.
Choose standard or VM obfuscation and configure any functions to target.
For API use, select a paid plan with API access and connect through REST or the npm package.

Verdict

Obfuscator.io offers browser-based standard processing alongside quota-limited VM obfuscation and build integrations. Treat obfuscation as a deterrent rather than encryption, and test output before production use.

Questions

Is there a free plan?

Yes. Free costs nothing and includes unlimited standard obfuscation, a 25 MB lifetime VM quota, and a 4 MB VM file-size limit.

What do the paid plans cost?

Pro is $19 a month, Team is $59 a month, and Business is $149 a month.

Which platforms and targets are supported?

The service is available through web and API. Supported targets are browser, browser-no-eval, node, service-worker, userscript, and bytenode.

Can I use it in a build pipeline?

Yes. Pro and higher plans include API access through REST and the npm package. The API can be called from GitHub Actions, GitLab CI, Jenkins, or any runner with Node.

Does obfuscation protect frontend secrets?

No. The maker cautions that frontend secrets can be extracted and that obfuscation is neither encryption nor a guarantee against reverse engineering.

Can I use the API to offer obfuscation to third parties?

No. The terms prohibit using the API to run a third-party obfuscation SaaS or online tool, and prohibit reselling or white-labeling the service.

Facts from Obfuscator.io's own pages

Code targeting: Users can select individual functions for VM obfuscation by marking them with a comment and configuring the target functions mode. · obfuscator.io, 29 Sept 2026
Compatibility: The output is actively supported and tested on evergreen desktop browsers and iOS 16 or later; older browser support is best effort down to ES2015 module support, with Internet Explorer out of scope. · obfuscator.io, 29 Sept 2026
Integrations: The service offers REST API and npm package access, and its API can be called from GitHub Actions, GitLab CI, Jenkins, or any runner with Node. · obfuscator.io, 29 Sept 2026
Limitations: VM obfuscation may not work correctly with all input code or runtime environments, and the terms require users to test obfuscated code before production use. · obfuscator.io, 29 Sept 2026
Purpose: Obfuscator.io transforms JavaScript into harder-to-read code, including custom bytecode that runs in an embedded JavaScript virtual machine. · obfuscator.io, 29 Sept 2026
Security limit: The maker cautions that frontend secrets can be extracted and says obfuscation is not encryption or a guarantee against reverse engineering. · obfuscator.io, 29 Sept 2026
Source handling: The site says it does not keep source code; VM and HTML obfuscation send source to its servers for processing and discard it, while uploads larger than 4.4 MB on Team and Business use temporary storage deleted after processing. · obfuscator.io, 29 Sept 2026
Standard obfuscation: Standard obfuscation runs in the browser, is always free with no limits, and the playground says submitted code never leaves the device. · obfuscator.io, 29 Sept 2026
Support: The site lists [email protected] as its support contact and includes priority support with Business. · obfuscator.io, 29 Sept 2026
Supported inputs: The documentation says to compile TypeScript and JSX and bundle applications before obfuscation, and the site supports HTML files through its HTML parsing option. · obfuscator.io, 29 Sept 2026
Team workflow: Teams can share presets and service tokens and enforce obfuscator versions and presets across members and builds. · obfuscator.io, 29 Sept 2026
Usage metadata: For abuse handling and usage analysis, the service says it retains a SHA-256 hash of each obfuscated output and selected settings for three months, but not the code or its content. · obfuscator.io, 29 Sept 2026
Usage restriction: The terms prohibit using the API to operate an obfuscation SaaS or online tool for third parties, or reselling or white-labeling the service. · obfuscator.io, 29 Sept 2026
VM defenses: VM obfuscation offers self defending and debug protection features, including integrity checks, hook detection, breakpoint neutralization, and environment fingerprinting. · obfuscator.io, 29 Sept 2026

Where Obfuscator.io stands on Freedom251

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