GRAYA to OTB Converter
Processing entirely on your device — large files may take a moment.
GRAYA is raw 8-bit greyscale-plus-alpha pixels with no container — the lingua franca of shader pipelines and scientific imaging that just want the bytes. Convert images to 1-bit OTB for retro phone displays.
iLoveConverter processes everything locally on your computer, which makes it private and fast: no upload wait, no server storage, no limits. Add as many files as you like — batch conversion is built in.
How GRAYA compares to OTB
| GRAYA | OTB | |
|---|---|---|
| Structure | Grayscale + Alpha (raw) 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 GRAYA to OTB
- 1
Select your files
Drag & drop your GRAYA 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 GRAYA format
The Grayscale + Alpha (raw) coder of the ImageMagick set — the raw-pixels 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 GRAYA to OTB?
Think of it as moving your file to the container that fits the job. Niche format — few modern readers OTB works differently: Written natively by ImageMagick If any of that sounds like your task, run the conversion — it takes seconds and nothing leaves your device.
Frequently asked questions
Is this GRAYA 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 GRAYA to OTB?
No — OTB is a lossless format, so every pixel of the converted image matches your original GRAYA 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 GRAYA files matters (camera model, GPS, timestamps), keep the original file as the master and treat the converted copy as the shareable version.