Three simple steps
How to use this tool?
This free online converter translates COBOL source code into Gleam 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 Gleam.
- Step 3
Review the result
Review, copy, or download the resulting Gleam code from the output editor.
Language comparison
Key differences between COBOL and Gleam
| Characteristic | COBOL | Gleam |
|---|---|---|
| Syntax | Verbose, English-like syntax designed for readability and business logic. | Concise, modern syntax inspired by ML-family languages, designed for clarity and safety. |
| Paradigm | Primarily procedural and imperative. | Functional, with strong emphasis on immutability and pure functions. |
| Typing | Weakly typed, with limited compile-time type checking. | Statically and strongly typed, with a robust type system and type inference. |
| Performance | Optimized for batch processing and transaction-heavy workloads on mainframes. | Compiles to Erlang BEAM bytecode, offering good concurrency and reliability, but not focused on raw computational speed. |
| Libraries and frameworks | Limited modern libraries; mostly legacy codebases and mainframe integrations. | Growing ecosystem, can use Erlang and Elixir libraries, but native Gleam libraries are still limited. |
| Community and support | Large legacy community, strong support in enterprise and financial sectors, but aging. | Small but active and growing open-source community, mostly enthusiasts and early adopters. |
| Learning curve | Steep for modern developers due to outdated paradigms and tooling. | Gentle for those familiar with functional programming; modern tooling and documentation. |
Common questions
Frequently Asked Questions
How do I convert COBOL to Gleam?
Paste your COBOL code into the input box, confirm the languages are set to COBOL and Gleam, and click Convert. CodeConvert AI analyzes your COBOL code and generates equivalent Gleam code in seconds, preserving the original logic and structure.
What are the main differences between COBOL and Gleam?
COBOL and Gleam 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 Gleam equivalent. See the comparison table below for the key differences between COBOL and Gleam.
Is the converted Gleam code accurate?
The AI produces high-quality Gleam code that preserves the behavior of your original COBOL code and follows Gleam conventions. It handles common patterns, data structures, and idioms for both COBOL and Gleam. For large or performance-critical code, review and test the Gleam output before using it in production.
Can I convert an entire COBOL project to Gleam?
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 Gleam. Signing in for free raises the input limit to 25,000 characters per conversion for larger files.
Can I convert Gleam back to COBOL?
Yes. CodeConvert AI converts in both directions, so you can convert Gleam to COBOL just as easily using our Gleam to COBOL converter. Try the Gleam to COBOL Converter
Is the COBOL to Gleam 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 Gleam 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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