ODG to BMP Converter

ODG to BMP Converter

BMP is the Windows bitmap: a header, an optional palette, and rows of pixels stored plainly, which is why a BMP of a diagram is often megabytes where a PNG of the same picture is kilobytes. It survives because certain Windows applications, embedded toolchains, test fixtures and older imaging systems accept nothing else. An .odg is an OpenDocument Graphics drawing from LibreOffice Draw — vector shapes, connectors and text frames inside a ZIP of XML. This converter renders the Draw document page by page and writes each rendered page as a bitmap. The one control that genuinely changes the output here is the quality preset, and it does something unusual, so it is worth reading the table below before you convert.

How to Convert ODG to BMP

1. Upload Your ODG File: Drag the .odg onto the page or click "+ Add Files". The whole Draw document is read, so a multi-page file needs no splitting.
2. Pick a Quality Preset: BMP has no lossy quality dial, so this control selects a bitmap flavour rather than a compression level: High, Medium and Low each write a different kind of BMP. The next section spells out exactly what each one produces.
3. Set the Image resolution: "Image resolution" opens on "Keep original" and also takes a Resolution Percentage, a preset height, or an explicit Width x Height. Because BMP applies little or no compression, file size scales almost directly with the pixel count — this is the control that decides whether you get a manageable file or a very large one.
4. Convert and Download: Click "Convert" and save the bitmap. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. No sign-up, no watermark.

What Each Quality Preset Actually Writes

For a typical Draw document — flat fills, solid strokes, a dozen colours — Medium is usually the right answer: a 256-entry palette is far more than the drawing uses, the run-length encoding compresses long runs of identical pixels extremely well, and the result is a fraction of the High preset's size with no visible difference. Reach for High when a receiving system rejects palette bitmaps or expects true-colour data, and for Low only when size beats everything.

What Happens Between Upload and Download

A .odg is a page-layout document, not a picture, so it does not touch an image converter directly:

At 300 DPI a US Letter page (8.5 × 11 in) renders near 2550 × 3300 px and A4 near 2481 × 3507 px. At the High preset that is roughly two bytes per pixel with no compression, which is how a single page of line art turns into a file of many megabytes — so if size matters, lower "Image resolution" first and switch to Medium second.

BMP Against the Alternatives

Frequently Asked Questions

Why is a BMP of my drawing so much bigger than a PNG?

Because BMP stores pixels more or less as they are. At the High preset every pixel costs a fixed two bytes with no compression at all, no matter how simple the picture, so a full-page render lands in the megabytes while PNG's lossless compression squeezes the same flat colour into a small fraction of that. Switching to the Medium preset — a dithered 256-colour palette with run-length encoding — is the most effective single change if you must stay with BMP.

Which preset should I pick for a flowchart?

Medium, in almost every case. Draw documents are built from a handful of flat fills and solid strokes, so a 256-entry palette holds every colour the drawing actually uses, and the run-length encoding compresses the large uniform areas efficiently. High is the one to choose when a receiving system explicitly wants true-colour data or refuses palette bitmaps; Low drops to 86 colours and starts to show dithering texture in flat areas.

My Draw document has several pages — do I get one file or several?

Several — one BMP per page, numbered in page order and delivered together. A BMP holds exactly one image, so pages cannot share a file. The office stage renders every page, so nothing is skipped and there is no need to split the document beforehand. For all the pages in a single openable file, ODG to PDF is the right target.

Does a BMP keep the transparent background?

Usually not in practice. Only the 32-bit BMP variants carry an alpha channel, support for it across Windows applications is inconsistent enough that many tools show black or white where the transparency was, and none of the three presets here writes that variant. If the transparent background matters, ODG to PNG is the format to use.

What pixel size will I get if I leave the resolution alone?

The 300 DPI render of the page — around 2550 × 3300 px for US Letter, 2481 × 3507 px for A4. That is far more than most destinations need and, given how BMP stores pixels, it is the main driver of file size. Decide the dimensions from the destination before converting: a raster cannot be sharpened back up afterwards, but it shrinks gracefully.

Will the text remain editable?

No. Rendering turns shapes and type into a fixed grid of pixels, so nothing in the bitmap is selectable, searchable or editable. Keep the original .odg as your master; ODG to PDF and ODG to SVG are the targets that keep text as text.

Why does the Medium preset look slightly grainy in flat areas?

Because it dithers. Reducing to a 256-colour palette can leave visible steps in any area that was not already one of those colours, so Floyd–Steinberg error diffusion scatters the difference as fine noise instead — which reads as smoother than banding at normal viewing distance. On a drawing built from flat fills you will usually not see it at all; on a drawing with gradients or a photograph in it, you will.

Is BMP worth using in 2026?

Only when something requires it. PNG is smaller, lossless, carries real transparency and opens everywhere, so it is the better default for anything you control. BMP persists in Windows-specific tooling, embedded and industrial imaging, automated test fixtures and a few older applications that were written against the format directly — and when one of those names BMP, this is the page for it.

How are my uploaded files handled?

They travel over an encrypted connection, are processed on our servers, and are deleted automatically a few hours later along with any output. Nothing is shared, published or reused, no account is required, and no watermark is applied. The ODG converter hub lists every other target available for this source.