RGBO to FAX Converter

Get FAX output from your RGBO data online

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Quality Preserved

Your original RGBO visual data transfers cleanly to FAX format. The converter maps pixel content accurately without unnecessary loss.

Easy to Use

Converting RGBO to FAX takes just a few clicks. The clean interface guides you through uploading, choosing output, and downloading.

Privacy First

Convertio automatically deletes uploaded RGBO files after processing and purges FAX results within 24 hours. Your data stays yours.

How to convert RGBO to FAX

1

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

2

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

3

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

About formats

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
FAX is a generic image file extension associated with facsimile transmission formats standardized by the ITU-T (formerly CCITT), with the underlying Group 3 compression standard ratified in 1980. FAX files typically contain monochrome (1-bit, black and white) image data compressed using the Modified Huffman (MH) encoding defined in ITU-T Recommendation T.4, which assigns variable-length codes to run lengths of consecutive white or black pixels along each scanline. The standard resolution for Group 3 fax is 204x98 dpi (normal mode) or 204x196 dpi (fine mode), reflecting the capabilities of thermal and laser fax machines of the era. FAX files encountered digitally are often raw Group 3 encoded bitstreams or TIFF wrappers with CCITT Group 3 compression (TIFF compression tag 3). The Group 3 encoding scheme is highly efficient for typical business documents — pages with mostly white space and black text — achieving compression ratios of 10:1 to 20:1 compared to uncompressed bitmaps. One advantage is universal fax system compatibility: Group 3 encoding is the mandatory baseline for all fax machines worldwide, meaning FAX files contain data in exactly the format transmitted over telephone lines, preserving the original fax data without transcoding losses. The format's role in business communications history provides another dimension — billions of fax transmissions using this encoding moved legal documents, medical records, and business correspondence for decades, and archived FAX files represent an important documentary record. FAX images can be viewed and converted using LibreOffice, ImageMagick, GIMP, and standard document management systems.
Developer: ITU-T
Initial release: 1980

Frequently Asked Questions

Why convert RGBO to FAX?

RGBO contains raw pixel data with no metadata or structure — converting to FAX adds proper formatting so any application can display and share the image.

What programs open FAX files?

FAX files can be opened in fax software, IrfanView, XnView, and document management systems with fax support.

Can I convert RGBO to FAX for free?

Yes, Convertio offers free RGBO to FAX conversion. For heavy usage or larger data, premium subscriptions provide additional capacity.

What makes FAX a good target format?

FAX offers fax transmission format, monochrome, compressed. It gives your raw RGBO data a proper structure that any image viewer or editor can handle.

How does Convertio protect my uploaded data?

Your RGBO data is encrypted during transfer and deleted after processing. Converted FAX outputs are purged from servers within 24 hours.

Does the converter handle batch RGBO uploads?

Absolutely. You can upload multiple RGBO sources simultaneously and convert all of them to FAX in one go — no need to repeat the process.