Edge cases
shouldn't test
your sanity.
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Software testing
Boundary values
BorderlineData instantly generates comprehensive boundary values and edge case test data for common input fields for your software testing, so you can find those pesky bugs faster and deliver more robust software.
🔒 No data leaves your browser. Ever.
⚡ Instant generation, zero latency
🧪 16 battle-tested data types
📋 One-click copy to clipboard
🌐 OWASP-aware edge cases included
Why BorderlineData
Built by testers, for testers (and developers too)
We’ve all been there: manually crafting edge case data in a spreadsheet at 11pm. We built this so you don’t have to. You’re welcome.
⚡
Zero Time-to-Value
Open the tool, pick your data type, get a full matrix of valid, boundary, and invalid cases — before your coffee’s ready.
🛡️
Privacy-First Architecture
Every value is generated in your browser using pure JavaScript. No API calls, no logs, no “we anonymise your data” disclaimers.
OWASP & ISTQB Informed
Edge cases aren’t random. They’re crafted to cover SQL injection, XSS, buffer overflows, boundary conditions, and more.
Testimonials
What are people saying
★★★★★
“Finally, a tool that generates the email edge cases I always forget — like firstname.surname1-surname2@domain.com or the one with 254 characters. My dev team is starting to fear me again.”
Marcus T.
SDET, E-Commerce Platform
★★★★★
“The SQL injection edge cases alone are worth it. I ran them against our UAT environment and immediately found two critical defects. Earned praise from my manager at the daily standup!”
Siva S.
Test Lead, Insurance Group
★★★★★
“I used to spend 30 minutes building boundary value data in a spreadsheet. Now it takes less than 5 seconds. Massive productivity gains. This is now my essential test data generation tool for all my projects.”
Sara K.
Senior QA Engineer, FinTech Startup