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OTB Converter

Convert OTB images to a variety of formats, edit and optimize images online and free.

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Over The Air Bitmap Image (.otb)

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.

How to convert OTB?

  1. Upload OTB File

    Drag and drop your OTB image into the upload area.

  2. Choose Output Formats

    Select the conversion format that matches your OTB file requirements.

  3. Convert & Download

    When the process ends, use the Download button to access the file.

OTB Converter

Convert OTB on Desktop

(macOS • Windows • Linux)

Vertopal CLI setup is required to manage OTB image conversions.

  1. Launch the command prompt interface.
  2. Navigate to the OTB folder or specify the input file path.
  3. Copy and execute the command, ensuring OTB_INPUT_FILE is replaced with your file path. $ vertopal convert OTB_INPUT_FILE --to output_format

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