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OTB File Format

Nokia OTA Bitmap category

OTB is the Nokia OTA Bitmap — 1-bit monochrome images that old Nokia phones displayed as operator logos and picture messages.

Typical use: Convert images to 1-bit OTB for retro phone displays.

About the OTB format

The Nokia OTA Bitmap coder of the ImageMagick set — the retro-phone format is written natively by the magick.wasm engine, entirely in your browser.

Obscure coder formats like this are exactly what template-driven converters list and never actually convert — here it really works.

Strengths

  • ✓ Written natively by ImageMagick
  • ✓ Runs entirely in your browser
  • ✓ Free, private, no watermarks

Limitations

  • ✗ Niche format — few modern readers
  • ✗ Feature subset varies by coder
  • ✗ Keep the original for re-editing
Structure
Nokia OTA Bitmap coder
Compatibility
ImageMagick, specialty tools
Best for
Legacy and specialty pipelines

Convert OTB to…

48 direct directions plus 12 workflows, sorted A–Z; 🔥 marks popular targets.

OTB to AVIF Hot OTB to BMP Hot OTB to CIN OTB to CUR OTB to DCX OTB to DDS OTB to FARBFELD OTB to FITS OTB to GIF Hot OTB to GRAY OTB to GRAYA OTB to HDR OTB to ICO Hot OTB to J2C OTB to J2K OTB to JFIF OTB to JP2 OTB to JPE OTB to JPEG Hot OTB to JPG Hot OTB to JPT OTB to JXL OTB to PALM OTB to PBM OTB to PCL OTB to PCX OTB to PDF Hot OTB to PFM OTB to PGM OTB to PNG Hot OTB to PNG24 OTB to PNG8 OTB to PNM OTB to PPM OTB to QOI OTB to RAS OTB to SIXEL OTB to SVG Hot OTB to SVGZ OTB to TGA OTB to TIF OTB to TIFF Hot OTB to UYVY OTB to VICAR OTB to WebP Hot OTB to XBM OTB to XPM OTB to XV

Cross-engine workflows

OTB to 7Z OTB to APK OTB to JAR OTB to TAR OTB to TAR.BZ2 OTB to TAR.GZ OTB to TAR.XZ OTB to TBZ2 OTB to TGZ OTB to TXZ OTB to WIM OTB to ZIP

Convert other files to OTB…

AVIF to OTB Hot BMP to OTB Hot CIN to OTB CUR to OTB DCX to OTB DDS to OTB FARBFELD to OTB FITS to OTB GeoTIFF to OTB GIF to OTB Hot GRAY to OTB GRAYA to OTB HDR to OTB HEIC to OTB Hot HEIF to OTB ICO to OTB Hot J2C to OTB J2K to OTB JFIF to OTB JP2 to OTB JPE to OTB JPEG to OTB Hot JPG to OTB Hot JPT to OTB JXL to OTB PALM to OTB PBM to OTB PCL to OTB PCX to OTB PFM to OTB PGM to OTB PNG to OTB Hot PNG24 to OTB PNG8 to OTB PNM to OTB PPM to OTB PSB to OTB PSD to OTB Hot QOI to OTB RAS to OTB RAW to OTB Hot SIXEL to OTB SVG to OTB Hot SVGZ to OTB TGA to OTB TIF to OTB TIFF to OTB Hot UYVY to OTB VICAR to OTB WebP to OTB Hot XBM to OTB XPM to OTB XV to OTB

Frequently asked questions

What is a OTB file?

OTB is the Nokia OTA Bitmap — 1-bit monochrome images that old Nokia phones displayed as operator logos and picture messages.

How do I convert OTB files online?

Pick a target format from the "Convert OTB to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.

Is it safe to convert OTB files here?

Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.

Which formats can OTB convert to?

This page lists all 60 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.