I Built a Browser-Based Payload Transformation Toolkit for Web Security Testing

I’ve been learning more about web security, bug bounty workflows, and how modern applications handle unusual or transformed input.

As part of that journey, I built WAF Bypass Toolkit — a browser-based tool that helps with payload transformation for authorized web security testing and research.

What it does

The idea is simple:

You start with a test input and apply different transformation techniques to see how the format changes.

This can help security researchers and developers better understand how applications, filters, and validation layers react to transformed input during testing.

Current focus

The toolkit is designed around common web security testing scenarios such as:

• SQLi
• XSS
• Command Injection
• LFI
• SSRF
• SSTI
• XXE

Features

Some of the transformations currently included are:

• whitespace transformations
• case toggling
• inline comments
• encoding variations
• multiple transformation combinations

Why I made it

I wanted something that is:

• fast to use
• browser-based
• simple to test with
• easy to expand over time

Another important goal was privacy and simplicity.

Everything runs client-side, which means no payloads or inputs need to be sent to a server.

Who it is for

This project is intended for:

• security researchers
• developers learning application security
• bug bounty practitioners working within authorized scope
• anyone experimenting in local labs or training environments

Demo

You can check it out here:

https://waf-bypass.dev/

GitHub repo:

https://github.com/Ilias1988/waf-bypass

Notes

This tool is intended strictly for educational purposes, research, and authorized security testing only.

Feedback welcome

This is an active project and I’m still improving it.

I’d love feedback on:

• UI/UX
• transformation ideas
• developer experience
• documentation
• feature suggestions