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Pricing Blog

RGB to MONO

Looking to convert RGB to MONO? Here's the honest answer — and what works instead.

MONO isn't a normal image format — it's a headerless raw pixel buffer, so there's no meaningful "convert RGB to MONO".

Why RGB to MONO isn't a standard conversion

1

MONO has no header

A MONO file is just a stream of raw pixel values (one-bit black-and-white samples) with no width, height or color information stored inside. Anything opening it has to be told the exact dimensions and layout separately — so it isn't a portable image you can simply convert to.

2

Use a real container instead

For an image you can actually open and share, pick a standard format that stores its own dimensions and color — PNG, JPG or TIFF.

What you can do instead

Convert RGB to PNG

Lossless with transparency — perfect for graphics, logos and screenshots.

RGB → PNG

Convert RGB to JPG

A small, universal photo format that opens everywhere.

RGB → JPG

Convert RGB to TIFF

Lossless and uncompressed — ideal for editing, archiving and print.

RGB → TIFF
Private — never stored Fast & secure Unlimited & free

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Format details

RGB is Silicon Graphics' image format from SGI Unix workstations, storing uncompressed or RLE-compressed color used in early 3D and film work.

Full nameSGI RGB Image
Developed bySilicon Graphics
Released1988
Extension.rgb
MIME typeimage/rgb
TransparencyVaries

RGB opens in GIMP, ImageMagick and SGI-era tools; convert to PNG/TIFF for modern editors.

MONO (Raw Monochrome Bits) is a raster image format developed by Various around 1980s. It's a specialised format — converting to a mainstream format like JPG or PNG makes it easy to open and share anywhere.

Full nameRaw Monochrome Bits
Developed byVarious
Released1980s
Extension.mono
MIME typeimage/mono
TransparencyVaries

MONO files open in specialised software and some professional tools; for everyday use, convert MONO to JPG or PNG.

Frequently asked questions

MONO stores only raw pixel bytes with no header, so it's used inside processing pipelines, not as a shareable image. A standard format like PNG or TIFF keeps its own size and color info.

Convert RGB to PNG, JPG or TIFF — free and instant.

Popular free tools

Image ConverterPNG to JPGHEIC to JPGWEBP to PNGResize ImageCrop ImagePNG to WEBPImage Compressor