Migration Premium v1.0.1

Easy COBOL Migrator - Desktop COBOL Migration Tool

Desktop COBOL transpiler for Windows, macOS, and Linux. Converts COBOL programs to C++ 17, Python 3, Rust, Go, Java 17, and C# 12 using a full compiler pipeline with semantic analysis and migration diagnostics.

Windows macOS Linux
Starting from $2,995
4.0 (1 review)
Easy COBOL Migrator - Desktop COBOL Migration Tool

About

Easy COBOL Migrator is a desktop transpiler that converts COBOL programs to six modern languages using a full compiler pipeline. Load a COBOL file, pick a target language, and the generated code appears instantly in a side-by-side editor. The tool parses all four COBOL divisions, builds a complete abstract syntax tree, runs semantic analysis, and produces idiomatic output - not a line-by-line transliteration.

The compiler pipeline handles 36 statement types, 220+ COBOL keywords, 40+ intrinsic functions, all PIC/USAGE data types, file I/O with record packing/unpacking, COPY/REPLACE preprocessing with nested copybooks, and full control flow restructuring (PERFORM, GO TO, EVALUATE, IF/ELSE). LINKAGE SECTION transpilation covers subprogram interfaces, and CALL statements support BY REFERENCE, BY CONTENT, and BY VALUE parameter passing. SORT key-field extraction handles multi-key comparators with ascending/descending order. Every conversion produces a Migration Report with diagnostic notes - flagging EXEC SQL/CICS/DLI blocks, dynamic CALL targets, and anything that needs manual review.

For larger projects, open an entire folder to discover all .cbl/.cob/.cpy files and batch-convert everything at once. Built-in COBOL utilities handle line numbering, format conversion, comment toggle, whitespace cleanup, copybook extraction, and data division reports.

All processing happens locally on your machine. Your source code is never uploaded, transmitted, or stored externally. The application ships with all required libraries bundled - no runtime dependencies.

For developers migrating from IBM z/OS, Micro Focus, and GnuCOBOL environments.

Actively developed - see the latest changelog here. Linux and macOS versions are unavailable temporarily.

Need help with the parts the tool can't convert? I offer hands-on COBOL migration services for EXEC SQL/CICS/DLI replacement, database re-platforming, and end-to-end modernization projects.

How It Works

1

Load your COBOL source

Open a single .cbl/.cob file or an entire folder. The tool auto-detects fixed-format and free-format source, resolves COPY/REPLACE directives, and handles nested copybooks.

2

Pick a target language

Choose from C++ 17, Python 3, Rust, Go, Java 17, or C# 12. The full compiler pipeline (lexer, parser, semantic analyzer, code generator) runs instantly.

3

Review output and migration report

Generated code appears in the side-by-side editor. The Migration Report flags EXEC SQL/CICS/DLI blocks, dynamic CALL targets, and anything needing manual review.

Key Features

Six Target Languages

Convert COBOL to C++ 17, Python 3, Rust, Go, Java 17, or C# 12. Each generator produces idiomatic, production-ready code following the conventions of the target language.

Full Compiler Pipeline

Not a line-by-line translator. A multi-stage compiler (Lexer, Parser, Semantic Analyzer, Code Generator) builds a complete AST with 36 statement types and 220+ recognized keywords.

Dual-Pane Editor

COBOL source on the left, generated output on the right. Syntax highlighting for both COBOL and the target language, dark/light themes, and COBOL-aware column editing for fixed-format source.

Source Format Auto-Detection

Automatically detects fixed-format (COBOL-85) and free-format source. Handles column 7 indicators (comments, continuations, debug lines) and the >>SOURCE FORMAT FREE directive.

COPY Preprocessor

Resolves COPY and REPLACE directives before parsing. Supports COPY ... REPLACING with pseudo-text substitution, nested copybooks up to 10 levels, and circular-include detection.

Migration Reports

Every conversion produces diagnostic notes (Info, Warning, Error) in the Migration Report panel. Flags EXEC SQL/CICS/DLI blocks, dynamic CALL targets, decimal precision considerations, and areas needing manual review.

Semantic Analysis

Symbol table construction, ambiguous name detection, variable resolution with OF/IN qualification, paragraph/section existence checks, level 88 validation, and type checking.

Complete File I/O

Full translation of OPEN, CLOSE, READ, WRITE, REWRITE, DELETE, and START in all 6 target languages. Record packing/unpacking with position tracking for seek-based REWRITE.

Arithmetic Precision

All COBOL arithmetic (COMPUTE, ADD, SUBTRACT, MULTIPLY, DIVIDE) with ROUNDED, ON SIZE ERROR, GIVING, and REMAINDER. Decimal precision preserved via BigDecimal, Decimal, or f64.

Batch Processing

Open entire folders, discover all .cbl/.cob/.cpy files recursively, and convert everything at once with Convert All. Progress dialog shows per-file status.

CLI Batch Mode

Run headless conversions from the command line for CI/CD pipelines. Process single files or entire directories with full control over the transpiler pipeline.

Data Type Mapping

Intelligent mapping of PIC clauses, COMP/COMP-1/COMP-2/COMP-3/PACKED-DECIMAL, REDEFINES, OCCURS, OCCURS DEPENDING ON, FILLER, and 88-level conditions to native types.

Robust Error Recovery

Graceful error handling across all pipeline stages ensures partial output and clear diagnostics even for malformed or incomplete COBOL source. Every file produces output, every time.

Subprogram Interfaces

Full LINKAGE SECTION transpilation for subprogram entry points. CALL with BY REFERENCE, BY CONTENT, and BY VALUE parameter passing. Static calls become direct function calls; dynamic targets generate dispatch scaffolding.

SORT and MERGE

SORT key-field extraction with multi-key comparators supporting offset, length, numeric/alpha type, and ascending/descending order. MERGE and RELEASE/RETURN statements for sort procedure integration.

COBOL Utilities

Built-in tools for COBOL source management: line numbering, fixed/free format conversion, comment toggle, whitespace cleanup, copybook extraction, and data division reports.

40+ Intrinsic Functions

LENGTH, TRIM, UPPER-CASE, LOWER-CASE, CURRENT-DATE, NUMVAL, NUMVAL-C, INTEGER-OF-DATE, and more. Each function is mapped to native equivalents in all six target languages.

Cross-Platform

Runs natively on Windows, macOS, and Linux. Ships with all required libraries bundled - no runtime dependencies, no Java, no .NET, no Docker. Download, install, and start converting.

Supported Languages

Source (Input)

COBOL (all dialects) IBM Enterprise COBOL, VS COBOL II, IBM COBOL for i (AS/400), Micro Focus (ACUCOBOL-GT), RM/COBOL, GnuCOBOL, COBOL-85, COBOL 2002/2014. Fixed and free format.
COBOL with Embedded SQL/CICS/DLI EXEC SQL, EXEC CICS, and EXEC DLI (IMS) blocks are preserved as comments with migration notes flagging them for replacement with native database access.
COBOL Copybooks .cpy, .cbl, .cob, .copy files. COPY ... REPLACING with pseudo-text substitution, nested up to 10 levels.

Target (Output)

C++ 17 Namespace-wrapped code with FixedString<N> template, Decimal type, std::fstream I/O, conditional includes.
Python 3 Module-level code with decimal.Decimal for precision arithmetic, global declarations, tell()/seek() for REWRITE.
Rust fn main() entry, f64/i64 types, match for EVALUATE, raw identifiers (r#) for reserved word collisions.
Go package main, float64 types, bufio.Scanner I/O, PascalCase exported struct fields.
Java 17 Class-wrapped code with BigDecimal and RoundingMode, BufferedReader/RandomAccessFile I/O.
C# 12 Namespace + class structure with decimal type, StreamReader/FileStream I/O, LINQ patterns.

Capabilities

  • Full COBOL Parser Recursive descent parser covering all 4 divisions (Identification, Environment, Data, Procedure) with complete AST generation.
  • Dead Code Detection Identifies unreachable paragraphs, unused data items, and obsolete copybooks during semantic analysis.
  • Complexity Metrics Cyclomatic complexity, lines of code, paragraph count, and nesting depth per program.
  • Cross-Reference Maps Tracks every data item usage, paragraph invocation, and file access across the codebase.
  • Fixed/Free Format Auto-Detection Automatically determines whether source is fixed-format (COBOL-85) or free-format. Handles column 7 indicators (*, /, -, D) and continuation lines.

  • Control Flow Conversion GO TO, PERFORM (simple, TIMES, UNTIL, VARYING, THRU), EVALUATE/WHEN, and nested IF/ELSE/END-IF to structured equivalents.
  • Data Structure Mapping Levels 01-49 group/elementary items, level 66 RENAMES, level 77 independent items, level 88 conditions, OCCURS, REDEFINES, FILLER.
  • Arithmetic with Precision COMPUTE expressions, ROUNDED, ON SIZE ERROR/NOT ON SIZE ERROR, GIVING, REMAINDER. Decimal scaling for implied V decimal points.
  • File I/O Translation OPEN (INPUT/OUTPUT/I-O/EXTEND), CLOSE, READ with AT END, WRITE with FROM, REWRITE with seek-based update, DELETE, START. File status tracking.
  • String Operations STRING ... DELIMITED BY, UNSTRING ... INTO, INSPECT TALLYING/REPLACING/CONVERTING with full clause support.
  • Table Operations SEARCH (linear), SEARCH ALL (binary), SET index UP BY/DOWN BY, OCCURS DEPENDING ON variable-length tables.
  • SORT and MERGE Operations SORT key-field extraction with multi-key comparators (offset, length, numeric/alpha, ascending/descending). MERGE, RELEASE, and RETURN statement support.
  • Subprogram Interfaces LINKAGE SECTION transpilation for subprogram entry points. CALL with BY REFERENCE, BY CONTENT, and BY VALUE parameter passing mapped to native function signatures.
  • Record Packing/Unpacking Fixed-width record lines parsed into struct fields on READ, and formatted back on WRITE. PIC display lengths calculated automatically.
  • 40+ Intrinsic Functions FUNCTION LENGTH, TRIM, UPPER-CASE, LOWER-CASE, CURRENT-DATE, NUMVAL, INTEGER-OF-DATE, and more mapped to native equivalents.

  • Idiomatic Code Generation Each generator follows target language conventions: namespaces in C++, global/module pattern in Python, match in Rust, PascalCase exports in Go.
  • Smart Naming Conventions COBOL identifiers transformed (hyphens to underscores, lowercase). Reserved word collisions handled per language (r# in Rust, cob_ prefix in Java/C#, _var suffix in Python/Go).
  • Comment Preservation COBOL comments carried over as documentation. EXEC SQL/CICS/DLI blocks preserved as comments with migration notes.

Screenshots

Easy COBOL Migrator dual-pane editor with COBOL source on the left and generated C++ 17 output on the right
Easy COBOL Migrator dual-pane editor with COBOL source on the left and generated Python 3 output on the right
Easy COBOL Migrator dual-pane editor with COBOL source on the left and generated Rust output on the right
Easy COBOL Migrator dual-pane editor with COBOL source on the left and generated C# 12 output on the right
Easy COBOL Migrator dual-pane editor with COBOL source on the left and generated Java 17 output on the right
Easy COBOL Migrator dual-pane editor with COBOL source on the left and generated Go output on the right

Click any image to view full size

System Requirements

Minimum

  • OSWindows 10 21H2 (64-bit) / macOS 12 / Ubuntu 22.04
  • RAM4 GB
  • CPU2 GHz dual-core
  • Storage500 MB free
  • NetworkInternet connection (for activation)

Recommended

  • OSWindows 11 (64-bit) / macOS 15+ / Ubuntu 24.04
  • RAM8 GB
  • CPU2.5 GHz quad-core
  • Storage1 GB free
  • NetworkInternet connection (for activation)

User Reviews

P
Prefer Anonymous 2026-03-21

I have been evaluating this for a medium-sized COBOL codebase (around 120 programs, mostly batch jobs). The generated C++ output is surprisingly clean for a v1 product. Most of the arithmetic and file I/O translated correctly on the first pass, and the migration report is genuinely useful for flagging the EXEC SQL blocks I need to rewrite manually. Lost a star because REDEFINES with nested groups still needed some hand-editing in a few edge cases, and the activation server was slow the first time I set it up. Also, there is no documentation beyond the built-in help, so I had to figure out the CLI batch flags by trial and error. That said, it saved my team weeks compared to doing the conversion by hand, and the 1.0.1 patch already fixed several issues I reported. Good tool, just needs a bit more polish around the edges.

Clean generated code Useful migration reports Fast conversion speed Responsive to bug reports
Enjoying this product?

I'd love to hear your feedback, leave a quick review!

Write a Review

Changelog

Fixed

  • DISPLAY of numeric variables (especially COMP-3/packed decimal) now formats output with correct sign prefix, zero-padded integer digits, and exact decimal places matching the PIC clause across all 6 target languages
  • Group item DISPLAY expansion now also applies PIC-based numeric formatting to child fields
  • ON SIZE ERROR now correctly detects arithmetic overflow by checking results against the target variable's PIC capacity (e.g. PIC 999 max 999, PIC S999 range -999 to +999) across all 6 target languages; previously only division-by-zero was caught while ADD, SUBTRACT, MULTIPLY, and COMPUTE overflows were silently ignored
  • Edited numeric fields (PIC with Z, *, $, +, -) are now mapped to string types instead of integer types across all 6 target languages; MOVE applies full PIC edit mask formatting via a new cobolEditFmt helper, and DISPLAY outputs the formatted string directly; BLANK WHEN ZERO is now applied at DISPLAY time rather than MOVE time, fixing type-incompatible assignments
  • REDEFINES fields now share storage with their base fields via init-time sync code across all 6 target languages; when the base field has a VALUE clause, the generated program builds a storage string from the base value and extracts substrings for each child of the redefining group, so overlaid data is correctly visible at runtime
  • REDEFINES with numeric base fields now correctly emits required imports/includes (#include <cmath> for C++, import java.math.BigDecimal for Java); previously the import flags were set after includes were already emitted
  • ADD...TO...GIVING and SUBTRACT...FROM...GIVING now correctly include the TO/FROM operands in the expression across Python, Rust, and Go; previously only the addends/subtrahends were used, producing wrong results (e.g. ADD A TO B GIVING C computed C = A instead of C = A + B)
  • BLANK WHEN ZERO DISPLAY in Rust no longer emits invalid format traits ({:08.2f} changed to {:08.2}, {:06d} changed to {:06})
  • BLANK WHEN ZERO DISPLAY in Java now correctly handles BigDecimal variables using .compareTo(BigDecimal.ZERO) == 0 instead of the invalid == 0 operator, and passes .doubleValue() to String.format()
  • COPY REPLACING with pseudo-text delimiters (== ==) now works correctly in the test harness
  • SET condition-name TO TRUE for level 88 conditions inside group structures now generates correctly qualified parent variable references across all 6 target languages; C++, Java, and C# used the simple name converter instead of the qualified reference function, while Python, Rust, and Go were missing level 88 handling entirely

Frequently Asked Questions

IBM Enterprise COBOL, VS COBOL II, IBM COBOL for i (AS/400), Micro Focus (ACUCOBOL-GT), RM/COBOL, GnuCOBOL, and standard COBOL-85/2002/2014. Both fixed-format and free-format source files are supported. Accepted extensions: .cbl, .cob, .cpy, .copy, .cobol, .cblle, and .sqb.

Yes. The free demo lets you convert single COBOL files (up to 500 lines) to C++ with the full compiler pipeline. Just enter your email to download - no account or payment required.

Embedded SQL, CICS, and DLI (IMS) blocks are preserved as comments in the generated output. A migration note flags each one so you know exactly where to replace them with native database access code (JDBC, ADO.NET, SQLAlchemy, etc.). DLI blocks include TODO markers with the original IMS calls as a reference for mapping to your chosen database API.

No. Easy COBOL Migrator uses a full compiler pipeline: COPY preprocessor, lexer (220+ keywords), recursive descent parser (36 statement types, full AST), semantic analyzer (symbol tables, type checking), and language-specific code generators. If the AST pipeline encounters too many errors, it automatically falls back to a legacy line-based transpiler so you always get output.

Professional licenses allow 1 machine activation. Enterprise licenses allow up to 5 machine activations. You can deactivate a machine from your members dashboard and reactivate on a different one at any time. Your license never expires - you own it permanently.

Only for initial activation and periodic license validation (once every 30 days). All conversion processing happens locally on your machine. Your source code is never uploaded, transmitted, or stored externally.

You keep using the last version you received indefinitely - your license never expires. To continue receiving new versions, bug fixes, and new language targets, you can renew with an Annual Maintenance plan ($749/year Professional, $2,499/year Enterprise). Maintenance also includes ongoing email support.

Maintenance renewals include all software updates (bug fixes, new features, new language targets) plus email support. Professional Maintenance includes 48-hour response time. Enterprise Maintenance includes 24-hour priority response. If your maintenance lapses, you can renew at any time to regain access to the latest version.

Every license includes 90 days of email support from the date of purchase. Professional licenses get standard email support. Enterprise licenses get priority email support with faster response times. After 90 days, ongoing support is included with an active Annual Maintenance plan, or available as a paid service at $200/hr (Professional) or $150/hr (Enterprise).

Yes. The Enterprise edition includes CLI batch mode for headless conversions. Process single files or entire directories with full control over the transpiler pipeline. See the built-in CLI Reference for GitHub Actions and GitLab CI examples.

Yes. If your migration needs go beyond what the tool handles automatically (EXEC SQL/CICS replacement, database re-platforming, custom integrations), I offer hands-on migration services at $200/hr for Professional customers and $150/hr for Enterprise customers. Visit the services page or email [email protected] to discuss your project.

Purchase License

$2,995 one-time
  • Single user, 1 machine activation
  • All COBOL dialects
  • All 6 target languages
  • GUI editor with migration reports
  • Batch conversion via GUI (Convert All button)
  • Single-file report export
  • 6 months updates
  • 90 days email support
Buy Professional Edition
$9,995 one-time
  • Up to 5 users, 5 machine activations
  • All COBOL dialects
  • All 6 target languages
  • GUI editor with migration reports
  • CLI batch mode for CI/CD integration
  • Project-wide consolidated migration report (PDF/HTML)
  • Custom copybook library search paths
  • White-label report output (remove product branding)
  • 12 months updates
  • 90 days priority email support
Buy Enterprise Edition
Secure checkout via Stripe Perpetual license - yours forever

Try the Demo

Download the free demo to evaluate before purchasing.

Demo Limitations

  • Maximum 500 lines of COBOL per file
  • Single file only (no folder/batch processing)
  • C++ output only
  • No CLI batch mode
  • No export or print
  • Watermark comments in generated output

Enter your email to receive the download link.

Support & Maintenance

Included with Purchase

  • 90 days of email support
  • Updates included (see tier)
  • Access to knowledge base

Annual Maintenance

Continue receiving updates, new language targets, and email support after your included period ends.

Professional Maintenance $749/yr
All updates + email support (48hr response)
Enterprise Maintenance $2,499/yr
All updates + priority support (24hr response)

Paid Consulting

Need hands-on help beyond product support? Migration consulting is available after your included support period.

  • Professional: $200/hr
  • Enterprise: $150/hr (discounted)

Product Details

  • Version1.0.1
  • LicenseCommercial
  • CategoryMigration
  • PlatformsWin / Mac / Linux
Back to Products

Other Products

Easy Cloudflare Images

Easy Cloudflare Images

Free desktop app for Windows, macOS, and Linux to upload, manage, and optimize images with Cloudflare Images.

Free
View Details
Easy COBOL DB Migrator - Desktop COBOL Database Migration Tool

Easy COBOL DB Migrator - Desktop COBOL Database Migration Tool

Desktop tool for migrating COBOL data structures to modern SQL databases. Analyzes flat files, VSAM, DB2, CICS, and IMS/DL-I, then generates SQL DDL for 5 databases, data access layer code in 6 languages, and ETL migration scripts.

Premium
View Details
Easy Cloudflare R2

Easy Cloudflare R2

Free desktop app for Windows, macOS, and Linux to browse, upload, and manage your Cloudflare R2 object storage buckets.

Free
View Details
Easy COBOL Migration Complete Bundle - Code + Database Migration Toolkit

Easy COBOL Migration Complete Bundle - Code + Database Migration Toolkit

Get both Easy COBOL Migrator and Easy COBOL DB Migrator together at a bundled price. Transpile COBOL to 6 modern languages and migrate data structures to 5 SQL databases with full ETL scripts, all in one package.

Premium
View Details
Easy Cloudflare D1

Easy Cloudflare D1

Free desktop app for Windows, macOS, and Linux to browse, query, and manage your Cloudflare D1 serverless SQL databases.

Free
View Details
Easy Cloudflare KV

Easy Cloudflare KV

Free desktop app for Windows, macOS, and Linux to browse, manage, and monitor your Cloudflare Workers KV namespaces and key-value pairs.

Free
View Details