SIX to PBM Converter

Turn SIXEL art into PBM images for free online

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Effortless Process

The SIX to PBM converter guides you through a clear upload-convert-download workflow — no technical expertise required.

File Privacy First

Uploaded SIX images and converted PBM results are automatically purged — originals immediately, outputs within 24 hours.

Fast Conversion

SIX to PBM processing completes in seconds for typical image sizes. Cloud infrastructure keeps turnaround times consistently short.

How to convert SIX to PBM

1

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

2

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

3

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

About formats

SIX is a file extension for SIXEL (Six Pixel) graphics data, a bitmap graphics format developed by Digital Equipment Corporation (DEC) in 1983 and introduced with the LA50 dot matrix printer. SIXEL encodes images as a sequence of printable ASCII characters, where each character represents a column of six vertical pixels (a 'sixel') — the character's ASCII value minus 63 provides a 6-bit binary pattern, with each bit controlling one pixel in the vertical column. The encoding is structured as a series of sixel bands (each six pixels tall) across the image width, with control sequences for color selection (up to 256 registers with HLS or RGB specification), repeat counts (run-length encoding for efficiency), carriage return, and newline commands. SIXEL data is transmitted to the output device using DEC's standard escape sequence protocol, embedded within the text stream alongside regular character output. Originally designed for DEC's line of printers and later supported by DEC VT-series terminals (VT240, VT330, VT340), SIXEL has experienced a remarkable revival in modern terminal emulator software. One advantage is terminal-native image display: SIXEL allows images to be rendered directly within a text terminal session without requiring a graphical window system, enabling command-line tools to display graphs, photographs, and previews inline with text output. This capability has driven adoption in modern terminals like mlterm, xterm, WezTerm, and foot. SIX/SIXEL data can be generated by ImageMagick, libsixel, and chafa, and viewed in any SIXEL-capable terminal emulator.
Initial release: 1983
PBM (Portable Bitmap) is the monochrome (black and white, 1-bit) member of the Netpbm family of image formats, created by Jef Poskanzer in 1988 as part of the Pbmplus toolkit for Unix systems. The format exists in two variants: ASCII (magic number P1), where each pixel is represented as a text character '0' (white) or '1' (black) separated by whitespace, and binary (magic number P4), where pixels are packed eight per byte for compact storage. Both variants begin with a plain-text header specifying the magic number, image width and height, and optional comments. PBM was designed as the simplest possible image format — a bridge format for converting between the many incompatible raster formats that proliferated across different Unix systems and applications during the 1980s. The Netpbm philosophy was to convert any source format to PBM/PGM/PPM as an intermediate step, then convert to the target format, using the portable formats as a universal exchange layer. One advantage is extreme simplicity — the ASCII variant can be literally typed by hand in a text editor, and both variants are trivial to parse and generate in any programming language without external libraries. The format's role as a universal image processing intermediate is another strength: hundreds of Netpbm command-line tools accept PBM input, enabling complex image manipulation pipelines through Unix pipes. PBM remains used in computer science education, OCR preprocessing, and any context where a dead-simple monochrome image representation is needed.
Developer: Jef Poskanzer
Initial release: 1988

Frequently Asked Questions

Why convert SIX to PBM?

SIXEL graphics only render in compatible terminals. A PBM conversion captures the visual content in a universally supported format.

What programs can open PBM?

GIMP, IrfanView, XnView, Photoshop, and most Linux image viewers open PBM files. The format is part of the Netpbm toolkit family.

Is the conversion from SIX to PBM lossless?

PBM preserves image data without lossy compression, so the visual content from your SIX is retained faithfully during conversion.

How long does SIX to PBM conversion take?

The process is fast — cloud-based processing handles SIX to PBM conversion in seconds for standard-sized images, even on slower connections.

Can I queue several SIX files for conversion?

Batch conversion is supported. Queue as many SIX files as you need and convert them all to PBM in a single run — no repeating steps manually.

Can I convert SIX from any terminal type?

As long as the file contains valid SIXEL-encoded data, Convertio can process it regardless of which terminal originally created it.