Click the "Select File" button above, and choose your A51 file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.
Convert A51 to another file type
To convert A51 assembly files to another format, you need Keil µVision or other Developer software.
Convert a file to A51
To convert other file formats to the "Assembly Code File" file type, you need software like Keil µVision or a similar tool.
About A51 files
A .A51 file contains assembly language source code written specifically for the Intel 8051 family of microcontrollers. Developers use these files primarily within the Keil µVision IDE and compile them using the Keil A51 Macro Assembler. While essential for embedded systems programming, the .A51 format is incredibly restrictive for general use. It is a raw, uncompiled text file that requires a specialized compiler toolchain to execute. Sharing these files with non-developers often breaks syntax formatting, and they are practically impossible to read on mobile devices or standard document viewers. Furthermore, manual review of bare code is prone to errors without proper IDE syntax highlighting. To solve these issues, you need to convert the file. For archiving or sharing code reviews with management, convert .A51 to PDF to freeze the formatting permanently. For broad web compatibility and easy reading, convert it to TXT. If your goal is to execute the program on actual hardware, the file must be assembled into an Intel HEX or OBJ binary.
Convert.Guru analyzes your A51 file, detects the exact format, and lets you read the text inside.
If you want to convert A51 file to CSV, JSON, XML, YAML, YML, TOML, INI, CFG, CONF, DAT, DB or SQL, you can use Keil µVision or similar software from the "8051 Assembly Source Code" category. In the File menu, look for Save As… or Export….
To convert DBF, XML, SQLITE, XLSX, SQL, TSV, ACCDB, YAML, MDB, CSV, ODS or JSON files to A51, try Keil µVision or another comparable tool in the "8051 Assembly Source Code" category.
The A51 Converter Story
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our A51 converter.