BMP to SIXEL Converter

Free BMP to SIXEL converter — works right in your browser

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Shed the Weight

Uncompressed BMP files waste storage — converting to SIXEL applies efficient encoding that can reduce file size by 80% or more.

Effortless Process

Converting BMP to SIXEL takes just a few clicks. The clean, intuitive interface makes format conversion accessible to everyone.

Works Everywhere

Convert BMP to SIXEL from any device — Windows, Mac, Linux, iOS, or Android. All you need is a browser and internet connection.

How to convert BMP to SIXEL

1

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

2

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

3

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

About formats

BMP (Bitmap) is a raster image file format developed by Microsoft for the Windows operating system, introduced with Windows 3.0 in 1990. The format stores pixel data in a straightforward structure: a file header specifying dimensions, color depth, and compression method, followed by an optional color palette and then the raw pixel array. BMP supports color depths from 1-bit monochrome through 4-bit and 8-bit indexed color to 16-bit, 24-bit true color, and 32-bit with alpha channel. Most BMP files store pixels uncompressed (BI_RGB), though optional RLE compression is available for 4-bit and 8-bit modes. Pixels are arranged in bottom-up row order by default, with each row padded to a 4-byte boundary. One advantage is absolute simplicity — the format has no complex encoding, filtering, or compression layers, making BMP files trivial to read and write programmatically in any language. This simplicity also means BMP images render with zero decoding overhead, useful in scenarios where decompression latency matters. The format's deep Windows integration is another strength: BMP is the native bitmap format for Windows GDI, clipboard operations, and device-independent bitmap (DIB) handling, ensuring first-class support across the entire Windows ecosystem. While BMP's lack of compression produces large files unsuitable for web use or storage-constrained environments, it remains widely used as an intermediate format in image processing, as a clipboard exchange format, and in embedded systems where decoding simplicity outweighs file size.
Developer: Microsoft
Initial release: 1990
SIXEL (Six Pixel) is a bitmap graphics encoding format created by Digital Equipment Corporation (DEC) in 1983 for rendering images on character-cell printers and video terminals. The name derives from the encoding's fundamental unit: a column of six pixels represented by a single ASCII character. Each printable character in the sixel data stream (ASCII 63-126) encodes a 6-pixel vertical column, with the character's binary value determining which pixels are on or off. Color is specified through register-based palette control: a Select Color Sequence assigns an HLS or RGB color value to a numbered register, and subsequent sixel characters use that color until another register is selected. The encoding supports raster attributes for specifying pixel aspect ratio and image dimensions, repeat sequences (! followed by a count and character) for run-length compression of identical columns, and $ (carriage return) and - (new line) for navigating the sixel grid. DEC implemented SIXEL support in their VT240, VT241, VT330, and VT340 terminals, as well as multiple printer models. One advantage of the SIXEL encoding is its ASCII-clean nature: the data stream consists entirely of printable characters and standard control sequences, meaning SIXEL graphics can be transmitted through any text-based communication channel — serial terminals, SSH sessions, telnet connections — without requiring binary-safe transport or protocol modifications. The format's modern renaissance provides another remarkable dimension: after decades of obscurity, SIXEL support has been implemented in numerous contemporary terminal emulators, enabling inline image display in command-line workflows. SIXEL output can be generated by ImageMagick, libsixel, chafa, and various plotting libraries.
Initial release: 1983

Frequently Asked Questions

Why convert BMP to SIXEL?

SIXEL terminal graphics display your BMP in compatible terminals — useful for CLI image preview, system monitoring dashboards, and SSH workflows.

How do I open SIXEL files?

Common options include mlterm, xterm, mintty, SIXEL-enabled terminals. The format has good support across major operating systems.

Is BMP to SIXEL conversion free?

Basic conversions are free on Convertio. Premium plans offer faster processing, larger file sizes, and higher daily conversion limits for heavier workloads.

Is batch BMP to SIXEL conversion available?

Absolutely — upload multiple BMP files simultaneously and convert them all to SIXEL at once. Batch mode saves considerable time on repetitive conversions.

Is the conversion process fast?

BMP to SIXEL conversion usually finishes in a few seconds. Larger files may take slightly longer, but the cloud-based processing keeps things efficient.

Are my files safe during conversion?

Convertio uses encrypted connections for all transfers. Your BMP uploads are deleted immediately after conversion, and SIXEL downloads are removed within 24 hours.

BMP to SIXEL Quality Rating

4.7 (3 votes)
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