MOBI to RGBO Converter

Convert MOBI ebook pages to RGBO format — free online

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Opacity Channel Output

MOBI to RGBO conversion generates raw pixel data with an explicit opacity channel — purpose-built for specialized image processing tasks.

Fast Turnaround

Cloud infrastructure processes your MOBI ebook quickly. Even complex multi-page renders are completed and ready for download in seconds.

Secure Conversion

Your uploaded MOBI file is deleted as soon as conversion finishes. RGBO results are automatically erased from servers within 24 hours.

How to convert MOBI to RGBO

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose rgbo or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your rgbo file right afterwards

About formats

MOBI is an ebook format originally developed by Mobipocket SA, a French company founded in 2000 that was later acquired by Amazon in 2005. The format builds on the PalmDOC/PDB container structure, adding support for HTML-based content markup, embedded images, a DRM layer, and a JavaScript subset for limited interactivity. MOBI files use a record-based database architecture inherited from Palm OS, with a header structure containing metadata like title, author, publisher, and language followed by compressed HTML content records. The format became the foundation of Amazon's early Kindle ecosystem — the original AZW format used on first-generation Kindles was essentially MOBI with Amazon's own DRM wrapper. MOBI supports reflowable text with basic formatting including bold, italic, headings, lists, and tables, as well as internal hyperlinks and a built-in table of contents. One advantage is broad device compatibility: MOBI files are recognized by Kindle devices and apps spanning over a decade of hardware, as well as numerous third-party readers on desktop and mobile platforms. The format's lightweight structure is another strength — even long novels produce compact files that load quickly on modest hardware. While Amazon has since moved to the more capable AZW3/KF8 format for new publishing, MOBI remains widely circulated in existing ebook libraries and continues to be produced by conversion tools like Calibre for maximum Kindle compatibility.
Developer: Mobipocket SA
Initial release: 2000
RGBO is a raw pixel data format designation used by ImageMagick, the open-source image processing suite first released in 1990, representing images as a flat sequence of Red, Green, Blue, and Opacity (inverted alpha) sample values with no header, container, or compression. The RGBO channel ordering specifies that the fourth channel is opacity rather than alpha — where alpha represents transparency (0 = transparent, max = opaque), opacity represents the inverse (0 = opaque, max = transparent). This distinction matters in compositing pipelines where the mathematical convention for the fourth channel varies between systems: some compositing models work with alpha (transparency), while older conventions including portions of ImageMagick's internal processing historically used opacity. RGBO files contain raw sample data at a user-specified bit depth (8-bit, 16-bit, or floating-point per channel), with pixels stored in scanline order. Because there is no header, the image dimensions, bit depth, and endianness must be specified externally when reading the file — typically via ImageMagick command-line arguments. One advantage is direct compatibility with processing pipelines that use the opacity convention: RGBO eliminates the need for channel inversion when interfacing with systems that expect opacity rather than alpha, preventing subtle compositing errors that occur when transparency conventions are mixed. The format's raw-data nature provides another practical benefit — with no encoding overhead, RGBO data can be memory-mapped, processed with SIMD instructions, or piped between processes with minimal latency. RGBO is primarily used within ImageMagick processing chains and can be converted to any other format using ImageMagick's extensive format support.
Initial release: 1990

Frequently Asked Questions

Why convert MOBI to RGBO?

RGBO stores red, green, blue, and opacity channels as raw pixel data — necessary for specialized rendering pipelines that use opacity-based workflows.

What can read RGBO files?

ImageMagick handles RGBO natively. Custom applications and image processing scripts can also parse RGBO data when pixel dimensions are specified.

How is RGBO different from RGBA?

Both carry four channels, but RGBO uses an opacity channel instead of alpha. Opacity is the inverse of transparency — fully opaque means visible.

Will the file be very large?

Raw RGBO data is uncompressed with four bytes per pixel, so output files can be sizeable. The size depends on rendered page dimensions.

Is MOBI to RGBO conversion free?

Yes — Convertio handles this conversion at no cost. Premium accounts add benefits like bigger file uploads and faster queue priority.