OTB Converter
Convert OTB images to a variety of formats, 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.
Drag and drop your OTB image into the upload area.
Select the conversion format that matches your OTB file requirements.
When the process ends, use the Download button to access the file.
Vertopal CLI setup is required to manage OTB image conversions.