MKV to BMP Converter

Extract a BMP Frame from MKV Online

Grab a single still from a Matroska (.mkv) video and save it as a Windows Bitmap (.bmp) image. This pulls one frame — or several separate stills — out of the video; it does not convert the whole clip. BMP stores that frame as raw, uncompressed pixels, which is exactly what some legacy Windows apps, imaging SDKs, and machine-vision tools expect, even though the files are large for their pixel count.

How to Convert MKV to BMP

1. Upload Your MKV File: Drag and drop your .mkv file onto the page or click "+ Add Files" to pick it from your computer.
2. Choose Specific Frame and set Time (seconds): Open Advanced Options, select Specific Frame, and type the timestamp of the moment you want as a still. To grab several stills instead, switch to Multiple Screenshots.
3. Set Image resolution (Optional): Leave it at the source resolution for a 1:1 pixel copy, or pick a Resolution preset / percentage to scale the frame down before export.
4. Convert and Download: Click "Convert" to render the frame and download your .bmp. No sign-up, no watermark.

BMP vs PNG vs JPG for an Extracted Frame

The frame you pull out is only as sharp as the source video allows — converting a compressed video frame to BMP stores it losslessly but cannot add detail the encoder already discarded. The format you save it in only changes file size and compatibility, not the picture:

If you just want a small, shareable, pixel-exact still, extract the frame as PNG (lossless and compressed) or as JPG (smallest file). Choose BMP only when a tool specifically requires an uncompressed bitmap.

Frequently Asked Questions

Why is a single BMP frame so much larger than the MKV it came from?

The MKV is compressed video — codecs like H.264 or VP9 store only the differences between frames. BMP stores every pixel of one frame as raw bytes with no compression. A 1920×1080 frame is 1920 × 1080 × 3 bytes (blue, green, red) ≈ 6 MB at 24-bit. That is normal for an uncompressed bitmap, not a sign anything went wrong.

Does saving the frame as BMP improve its quality over the video?

No. BMP is a lossless container, so it preserves the frame exactly — but it cannot recover detail the video codec already threw away. The extracted still's ceiling is the source frame itself. In our testing, a frame pulled from a heavily compressed MKV shows the same blocking and softness in BMP as it does in the original video; BMP just stores those artifacts without adding more.

Can I extract several stills from one MKV in a single pass?

Yes. Switch from Specific Frame to Multiple Screenshots in Advanced Options. The tool samples the timeline and returns the frames as separate image files so you can keep the ones you want. Each is an independent still — this never reassembles them into a video.

What color depth does the output BMP use?

The output is a standard 24-bit BMP (8 bits each for red, green, and blue), which covers the full color range of a typical video frame. BMP also supports 1-, 4-, 8-, 16-, and 32-bit variants, but 24-bit is the right match for photographic video content and is what virtually every Windows imaging tool expects.

Should I use BMP or PNG for a screenshot I want to share?

PNG, almost always. PNG is also lossless, so the picture is identical, but its compression makes the file roughly 50–80% smaller than the equivalent BMP — and Windows, macOS, and Linux all save screenshots as PNG by default. Reach for BMP only when a specific application refuses anything but an uncompressed bitmap. For sharing, save the frame as PNG instead.

How are my files handled, and how long do you keep them?

Your .mkv is uploaded over an encrypted connection, the frame is rendered on our servers, and both the upload and the resulting .bmp are deleted automatically a few hours after conversion. There is no sign-up, no watermark, and your files are never shared or made public.