Convert CAL to OTB
Convert CAL images to OTB format, edit and optimize images online and free.
Drop Files Anywhere to Upload
The CAL file extension, known as CALS (Continuous Acquisition and Life-cycle Support) Type 1 Image, is a 1-bit black-and-white raster image format developed by the U.S. Department of Defense in the mid-1980s to standardize graphics data interchange for military documentation. It is primarily used for storing and sharing monochrome images while retaining orientation metadata. The format supports both uncompressed and compressed (using CCITT Group 4 compression) images.
The OTB (Over The Air Bitmap) file extension, developed by Nokia, is used for transmitting black and white bitmap images between mobile phones, particularly Nokia and Siemens models. These images, with a maximum resolution of 255x255 pixels, are often sent via SMS in either hexadecimal text or binary format. Historically, OTB files were popular in the early days of mobile communication for sending simple graphics, icons, and wallpapers when data transmission speeds were limited.
Click Choose File and pick the CAL image required for conversion.
Select tools to convert your CAL image into a OTB image, then click Convert.
Wait for the converter to finalize, then access your OTB image.
To change CAL format to OTB, upload your CAL file to proceed to the preview page. Use any available tools if you want to edit and manipulate your CAL file. Click on the convert button and wait for the convert to complete. Download the converted OTB file afterward.
Vertopal CLI enables structured conversion from CAL image to OTB image.