CounterString Generator - Instructions
A small tool for generating counterstrings.
About Page
Counterstrings help identify where text was truncated. The generated string embeds position markers so you can see how much of the value survived after copy, paste, save, render, or export.
Use it to practice:
- field length testing
- truncation checks
- generated data workflows
- copy and paste behaviour
- testing display and persistence boundaries
CounterString Resources
For more background, examples, source code, and related tools:
- CounterString JS tool - the Evil Tester CounterString tool page.
- CounterString Chrome extension - a browser extension for generating counterstrings while testing.
- CounterString JS source code - the GitHub repository for the JavaScript implementation.
- CounterString new version announcement - notes about the updated version.
- CounterStrings in action - examples of using counterstrings during testing.
- CounterString snippets - snippets and browser-extension usage notes.
- CounterString algorithms - background on how counterstrings can be generated.
Exploratory Testing
Generate a counterstring, paste it into a target application, then inspect the stored or displayed value to identify the exact truncation point.