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Why convert PNG to OTB?
Fast
Your file is converted in under 30 seconds in our cloud.
Secure
Files are automatically deleted after 1 hour.
Quality preserved
Maximum quality preserved during conversion.
About the PNG format
PNG — Portable Network Graphics
PNG is a lossless image format that supports transparency (alpha channel). Created as an open alternative to GIF, it is the preferred format for web graphics, logos, icons, and any image that requires crisp edges or transparent backgrounds.
Common uses
- Logos and icons with transparency
- Web graphics and UI elements
- Screenshots
- Images requiring precise color accuracy
About the OTB format
OTB — On-the-air Bitmap (Nokia)
OTB is a monochrome bitmap format originally used by Nokia feature phones for sending and receiving images over SMS (picture messages). It was a standard format in early mobile phones of the late 1990s and 2000s for simple graphics like logos and ringtone icons.
Common uses
- Nokia mobile phone picture message images
- Converting legacy feature phone graphics
- Historical mobile messaging image recovery
- Early mobile logo and icon conversion
Related conversions
Other conversions available for PNG and OTB files
Frequently asked questions
How do I convert PNG to OTB?
Upload your PNG file above, choose OTB as the output format, then click Convert. Your OTB file is ready to download in seconds — nothing to install, and it works in your browser.
Is the conversion free?
Yes, basic conversion is completely free. For large volumes, check out our paid plans.
What is the maximum file size?
Free accounts can convert files up to 25 MB. Pro accounts up to 100 MB.
How long are my files kept?
Files are automatically deleted after 1 hour on the free plan, 24 hours on Pro.
What formats are supported?
We support over 200 source and target formats. See our complete formats page.
Remove ads and get unlimited conversions by creating a free account.