CR3 to MKV Converter

CR3 to MKV Converter

CR3 is Canon's current raw photo format; MKV (Matroska) is an open, codec-agnostic video container. Converting one to the other is a render, not a re-wrap: the raw sensor data is demosaiced into ordinary pixels, encoded as a video stream, and held on screen as a single motionless frame for a duration you set. The result is a silent still clip inside a Matroska container — useful as a slate, a hold shot, or a photo card in an MKV-based playback or editing chain, and useless as a substitute for the raw itself.

CR3 Format at a Glance

MKV Format at a Glance

How to Convert CR3 to MKV

1. Upload Your CR3 File: Drag and drop your .cr3 onto the page or click "+ Add Files" — EOS R-series, EOS M50 and other Canon raw captures all work, and several can be queued at once.
2. Set Merge Strategy and Image Duration: Merge strategy defaults to "Merge images" (all uploads become one MKV); "Video per image" writes a separate file each. Image Duration controls how long each still is held, from 1/60 of a second to 10 seconds, default 5 seconds per frame.
3. Review Video Codec, Quality Preset, and Background Color: Video Codec defaults to H.264 for MKV. Quality Preset defaults to "Very High (Recommended)". Background Color (White by default) fills any bars where the photo's aspect ratio does not match the video frame.
4. Convert and Download: Click "Convert" and save the MKV. Files are uploaded over an encrypted connection, converted on our servers, and deleted automatically after a few hours. No sign-up, no watermark.

Frequently Asked Questions

Which video codec does the MKV output use, and what else can I choose?

H.264 by default. Matroska is a container rather than a codec, so it has to carry an encoded stream; H.264 is the default our option rules apply to MKV output and the most broadly decodable choice. The Video Codec menu also offers H.265, VP9, AV1, MPEG-4, MPEG-2, Theora, MJPEG, HuffYUV, VP8 and several legacy codecs, all of which Matroska can mux.

Does the MKV contain an audio track?

No. The source is a photograph, so there is no audio to encode — the Audio Codec control is hidden whenever the input is an image, and the file is written video-only rather than with a silent placeholder track. Matroska itself can carry audio and subtitles alongside the video, so you can mux a soundtrack in later with any Matroska tool or editor.

How many frames does the clip actually contain?

Fewer than you might expect. There is no frame-rate control on this page, so a still is encoded at one frame per second with B-frames disabled — a five-second hold is a five-frame file. That keeps the MKV tiny, because every frame is identical and H.264 codes the repeats almost for free. Editors normally conform the clip to the sequence frame rate when you drop it on a timeline.

Do I lose the raw editing latitude when I convert CR3 to MKV?

Yes, entirely. A CR3 stores unprocessed sensor data via the crx codec, which is why highlights, shadows, and white balance stay adjustable long after the shot. Getting that into a video stream requires demosaicing and tone-mapping it into a finished 8-bit frame first, and once that frame is inside the MKV the latitude is gone, exactly as it would be in a JPEG. Render once, keep the original .cr3 as the editable master.

Does this read lossy C-RAW files as well as lossless raw?

Yes. The crx codec supports both a lossless raw mode and the smaller lossy C-RAW ("compact raw") mode, and both are ordinary .cr3 files as far as this conversion is concerned. Either way the render flattens the sensor data into a finished video frame, so the distinction does not survive into the MKV — C-RAW files simply upload faster because they are smaller on disk.

How is CR3 different from the older CR2 format?

Structurally, quite a lot. CR2 files are built on a TIFF-based layout, whereas CR3 moved to the ISO base media file format — the same box-based structure that MP4 and MOV use — and introduced the crx codec with its lossless and C-RAW modes. Practically, that is why older raw decoders that handle CR2 fine may need updating before they can open CR3. If your photo is a .cr2, use the matching CR2 converter instead.

Can the MKV carry my photo's EXIF data, like shutter speed and lens?

Not as EXIF. Matroska has its own tagging system for titles, dates, and descriptions, but no field that maps to a camera's exposure metadata, and this conversion writes a video stream rather than copying the still's metadata block across. If the shooting data matters, keep the .cr3 or export a still that preserves EXIF — CR3 to JPG does.

Should I convert to MKV, or is another target better?

It depends where the file is going. MKV is excellent for local playback and for muxing tracks together, but browsers do not play arbitrary .mkv files and many phones and TVs are fussy about it; CR3 to MP4 writes the same H.264 video into a container that plays essentially everywhere. And if what you actually want is a picture rather than a video, CR3 to JPG is far smaller and opens on anything.

What happens to my file during and after conversion?

It is uploaded over an encrypted connection, rendered and muxed on our servers, and deleted automatically after a few hours — never shared, never made public, no sign-up and no watermark. In our pipeline the raw is first rendered to a clean PNG with its long edge clamped to 4096 pixels before FFmpeg encodes it, so even a 45-megapixel capture produces a well-behaved stream. The practical limit on a big job is upload size and time, since CR3 files often run tens of megabytes each.