DCX to OTB Converter
Processing entirely on your device — large files may take a moment.
Multi-page PCX and Nokia OTA Bitmap exist for different jobs: DCX is a multi-page container of PCX images — the fax-document format of ZSoft-era DOS software. Convert images to 1-bit OTB for retro phone displays.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How DCX compares to OTB
| DCX | OTB | |
|---|---|---|
| Structure | Multi-page PCX coder | Nokia OTA Bitmap coder |
| Compatibility | ImageMagick, specialty tools | ImageMagick, specialty tools |
| Best for | Legacy and specialty pipelines | Legacy and specialty pipelines |
How to convert DCX to OTB
- 1
Select your files
Drag & drop your DCX files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to OTB". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted OTB file individually, or grab everything at once as a ZIP archive.
About the DCX format
The Multi-page PCX coder of the ImageMagick set — the fax-archive 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
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
Why convert DCX to OTB?
Converting makes sense where the strengths of OTB meet what DCX cannot give you. Written natively by ImageMagick Meanwhile Niche format — few modern readers One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this DCX to OTB converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Will I lose quality converting DCX to OTB?
No — OTB is a lossless format, so every pixel of the converted image matches your original DCX file. You can also adjust the quality/size balance before converting when the target format supports compression.
Will transparent areas survive the conversion to OTB?
Transparency is kept whenever OTB actually supports an alpha channel. If the target format has none (like JPG), transparent areas are flattened onto a white background — that is a property of the format, not of this tool.
What happens to EXIF data and other metadata?
Conversions here re-encode the image, and re-encoding generally does not carry the original metadata over. If the EXIF data of your DCX files matters (camera model, GPS, timestamps), keep the original file as the master and treat the converted copy as the shareable version.