Three simple steps
How to use this tool?
This free online converter translates COBOL source code into Crystal in three simple steps.
- Step 1
Add your COBOL code
Type, paste, or upload the COBOL code you want to translate.
- Step 2
Convert the code
Click Convert to translate the source code into Crystal.
- Step 3
Review the result
Review, copy, or download the resulting Crystal code from the output editor.
See it in action
Examples of COBOL to Crystal conversion
These examples show COBOL source code and the corresponding Crystal translation. Generated results can vary as AI models are updated.
Example 1
Is String Palindrome
Program that checks if a string is a palindrome or not.
COBOL code
Crystal code
Example 2
Even or Odd
A well commented function to check if a number if odd or even.
COBOL code
Crystal code
Language comparison
Key differences between COBOL and Crystal
| Characteristic | COBOL | Crystal |
|---|---|---|
| Syntax | COBOL uses a verbose and English-like syntax. | Crystal uses a syntax similar to Ruby. |
| Paradigm | COBOL is primarily procedural and imperative. | Crystal is a statically-typed, object-oriented language with some functional programming features. |
| Typing | COBOL is statically-typed. | Crystal is statically-typed with type inference. |
| Performance | COBOL is known for its efficiency and performance in handling large-scale business applications. | Crystal is designed for performance and aims to be as fast as C. |
| Libraries and frameworks | COBOL has a limited number of libraries and frameworks available compared to modern languages. | Crystal has a growing ecosystem of libraries and frameworks, leveraging the existing Ruby ecosystem. |
| Community and support | COBOL has a mature community and good support for legacy systems. | Crystal has a smaller but active community with growing support. |
| Learning curve | COBOL has a steep learning curve due to its verbose syntax and outdated concepts. | Crystal has a moderate learning curve, especially for developers familiar with Ruby. |
Common questions
Frequently Asked Questions
How do I convert COBOL to Crystal?
Paste your COBOL code into the input box, confirm the languages are set to COBOL and Crystal, and click Convert. CodeConvert AI analyzes your COBOL code and generates equivalent Crystal code in seconds, preserving the original logic and structure.
What are the main differences between COBOL and Crystal?
COBOL and Crystal differ in syntax, type system, standard libraries, and common idioms, so copying code line for line usually will not compile. The converter maps each COBOL construct to its closest Crystal equivalent. See the comparison table below for the key differences between COBOL and Crystal.
Is the converted Crystal code accurate?
The AI produces high-quality Crystal code that preserves the behavior of your original COBOL code and follows Crystal conventions. It handles common patterns, data structures, and idioms for both COBOL and Crystal. For large or performance-critical code, review and test the Crystal output before using it in production.
Can I convert an entire COBOL project to Crystal?
You can convert COBOL files one at a time by pasting each file's code. For a full migration, convert each file and then review how classes, dependencies, and project structure map from COBOL to Crystal. Signing in for free raises the input limit to 25,000 characters per conversion for larger files.
Can I convert Crystal back to COBOL?
Yes. CodeConvert AI converts in both directions, so you can convert Crystal to COBOL just as easily using our Crystal to COBOL converter. Try the Crystal to COBOL Converter
Is the COBOL to Crystal converter free, and do I need to install anything?
Yes, it is free and runs in your browser with nothing to install and no IDE extension required. You can convert COBOL to Crystal without an account for up to 2 conversions per day. Sign in for free for higher limits.
What are the benefits of signing in?
Signing in unlocks CodeConvert AI's Pro converter with more powerful AI models, a built-in chat assistant, code execution, saved conversion history, and personal notes. Every free account includes 5 credits and supports up to 25,000 characters of input per conversion, with no credit card required.
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