123 Converter

Convert 123 files online for free


Drop or upload your .123 file
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How to convert your 123 file

  1. Click the "Select File" button above, and choose your 123 file.
  2. You'll see a preview.
  3. Click the "Convert file to..." button to save your file in the format you want.

Convert 123 to another file type

The converter easily converts your 123 file to various formats - free and online. No Excel or extra software needed.

  • 123 to DWG
  • 123 to DXF
  • 123 to DGN
  • 123 to RVT
  • 123 to RFA
  • 123 to SKP
  • 123 to 3DM
  • 123 to STEP
  • 123 to IGES
  • 123 to SAT
  • 123 to X_T
  • 123 to X_B

Convert a file to 123

The converter also works in reverse, so you can convert other Spreadsheet formats to 123 with high quality output.

  • SLDASM to 123
  • DGN to 123
  • PRT to 123
  • IAM to 123
  • X_B to 123
  • CATPRODUCT to 123
  • SLDPRT to 123
  • RVT to 123
  • ASM to 123
  • DWG to 123
  • CATPART to 123
  • DXF to 123

About 123 files

The .123 file extension is most famously associated with Lotus 1-2-3, the pioneering spreadsheet software from Lotus Development Corporation (later acquired by IBM). These files contain rows, columns, formulas, and charts similar to modern spreadsheets. However, because Lotus 1-2-3 was discontinued in 2013 and removed from the IBM Lotus SmartSuite, accessing this data today presents significant challenges. Modern versions of Microsoft Excel no longer natively support opening or importing .123 files, leaving users locked out of legacy financial data and historical records.

To regain access to your data, the most practical solution is converting the file to a standard format. For continued editing and calculation, converting .123 to XLSX (Excel Workbook) or ODS (OpenDocument Spreadsheet) is recommended. If you simply need to extract the raw data for import into a database or another system, converting to CSV is the most compatible choice. For archiving static reports where layout preservation is key, PDF is the ideal target. Note that a minority of .123 files may be Printed Circuit Board (PCB) designs from Sunstone Circuits PCB123 software, which requires specific CAD tools to view.

Use Convert.Guru to open and convert your 123 file.

Users also converted WK4, LWP, WK1, PDF, PSD, CRT, MSO, CDR, XLSX, TXT, ZIP and DAT files.



The 123 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 123 converter.