Convert OTB to CAL
Convert OTB images to CAL format, edit and optimize images online and free.
Drop Files Anywhere to Upload
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.
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.
Start uploading a OTB image by clicking the Choose File button or drag & dropping your OTB file.
For an advanced conversion, use the OTB to CAL optional tools available on the preview page and click the Convert button.
You will be redirected to the download page to see the conversion status and download your CAL file.
To change OTB format to CAL, upload your OTB file to proceed to the preview page. Use any available tools if you want to edit and manipulate your OTB file. Click on the convert button and wait for the convert to complete. Download the converted CAL file afterward.
Follow steps below if you have installed Vertopal CLI on your macOS system.
cd to OTB file location or include path to your input file.Follow steps below if you have installed Vertopal CLI on your Windows system.
cd to OTB file location or include path to your input file.Follow steps below if you have installed Vertopal CLI on your Linux system.
cd to OTB file location or include path to your input file.