CRW to MKV Converter

CRW to MKV — Which Video Wrapper Should an Old Canon RAW Go Into?

CRW is Canon's first-generation digital RAW — the unprocessed sensor file its earliest DSLRs and PowerShot G-series compacts wrote in the early 2000s, stored in Canon's own CIFF container. MKV (Matroska) is a modern, open, royalty-free video container. Turning a CRW into an MKV wraps one still photo, held on screen for a duration you set, with no audio. If you only need to see the picture, that is the wrong target — convert it to an image instead. The video wrappers worth comparing for a still slate are MKV and AVI, and the short answer is below: pick MKV for a modern editor or media-server timeline, AVI only when an old Windows tool demands that exact container.

MKV vs AVI for a Still-image Slate

When to Pick MKV

• Your editor, media server, or smart TV is current — MKV is the open, flexible default for H.264 and HEVC, and this converter writes H.264 into the MKV here.
• You may later mux the still together with other tracks: MKV holds unlimited video, audio, and subtitle tracks plus chapters in one file, where AVI is locked to a single video and audio track.
• You want the smaller, more future-proof file — MKV can carry modern codecs (HEVC, AV1) that AVI never supported.

When to Pick AVI Instead

• A specific older Windows editor, capture card, or archive process expects an .avi slate and nothing else.
• The playback target is genuinely ancient hardware — a 2000s DVD player or car head unit — where AVI's reach beats MKV's.
• If either of those is you, use CRW to AVI instead; otherwise MKV is the better-supported choice today.

CRW at a Glance

Knowing what a .crw actually is explains most of what the conversion can and cannot preserve.

How to Convert CRW to MKV

1. Upload Your CRW File: Drag and drop your Canon .crw file onto the page or click "+ Add Files" to browse. Any companion .thm thumbnails are harmless if included, and you can queue a batch from an EOS D30, D60, 10D, 300D, or PowerShot G-series folder at once.
2. Set Duration and Merge images: Open Advanced Options. "Duration" controls how long the still shows — from a single frame (1/60s) up to 10 seconds per frame, with 5 seconds per frame the default. Use "Merge images" to combine several photos into one MKV, or "Video per image" for a separate file per photo.
3. Pick Quality Preset and Background Color: Keep the "Preset" on "Very High (Recommended)", and set a "Background Color" (White by default) to fill any letterbox bars where the photo's shape does not match the output frame. Under "Show All Options" the "Video Codec" defaults to H.264, the codec this converter pairs with MKV.
4. Convert and Download: Click "Convert" and download your MKV. No sign-up, no watermark.

Frequently Asked Questions

Is MKV better than AVI for converting a CRW to video?

For almost everyone today, yes. MKV is an open, royalty-free container from 2002 that carries modern codecs and multiple tracks; AVI is a 1992 Microsoft container limited to one video and one audio stream. Since a CRW produces a single still slate either way, the deciding factor is the destination: MKV suits current editors, Plex/Jellyfin, and smart TVs, while AVI only wins when an old Windows tool or piece of hardware specifically requires that container. If it does, use CRW to AVI.

Which video codec does the MKV output use?

H.264 by default. MKV is a container, not a codec, so it must carry an encoded video stream inside it; for MKV output this converter defaults to H.264 (AVC), which plays in VLC, modern browsers, and virtually every recent media player. You can switch it under "Show All Options" via the "Video Codec" dropdown, which lists other MKV-compatible choices such as HEVC, VP9, and AV1. Because the source is a still photo, no audio stream is added.

Does the MKV have any motion or sound?

No. From a single CRW, the conversion renders your photo and displays it as one motionless frame for the duration you set — there is no panning, zoom, or animation, and the output carries no audio track, so the "Audio Codec" option does not even appear. If you upload several photos and choose "Merge images," they play back to back, but each frame is still a static image shown for its set duration, with no transitions between them.

Do I lose the RAW editing latitude when I convert CRW to MKV?

Yes. A CRW stores roughly 12-bit linear sensor data, which is why you can recover highlights and shift white balance long after the shot. To put the photo into a video, the converter renders it first — demosaicing the sensor data and baking in white balance, exposure, and tone. Once that rendered frame is inside the MKV, the latitude is gone, exactly as it would be in a JPEG. Keep your original .crw as your editable master for Lightroom or Canon's Digital Photo Professional.

Should I really be converting CRW to video at all?

Often not. CRW is Canon's first RAW format — used by the EOS D30, D60, 10D, and 300D and the PowerShot G-series from about 2000 to 2004, per the CIFF reference — and most people who find an orphaned .crw just want a viewable picture. If that is you, convert to an image with CRW to JPG and keep the .crw as your master; it is far smaller and opens everywhere. Convert to a video wrapper like MKV only when a timeline or media server genuinely needs a video file. For a clip that plays on the widest range of phones, CRW to MP4 is the safer video target than either MKV or AVI.

Which Canon cameras actually produced .crw files?

CRW came out of Canon's own Camera Image File Format, whose specification was released on February 12, 1997 and last revised on February 9, 1998. On the DSLR side it was written by the EOS D30, D60, 10D, and 300D; on the compact side by the PowerShot Pro1, the G1 through G6, and the S30 through S70. Canon then retired it in favour of CR2, so if your file came from anything newer than that list it is almost certainly a .cr2 and not a .crw. That generation of sensors tops out at around 3 to 8 megapixels, which is worth knowing before you scale the still up to a 1080p or 4K timeline — there is no extra detail to reveal.

Is CRW the same format as CR2?

No, and they are not interchangeable despite both being "Canon raw". CRW files are CIFF files: Canon's own container structure, developed with the CIFF Forum in the late 1990s. CR2 replaced it with a TIFF-based structure, and CR3 replaced that in 2018 with an ISO-base-media container using Canon's crx codec. Because the containers differ, software that reads CR2 does not automatically read CRW — support for the older format has thinned out over the years, which is one honest reason to render an orphaned .crw into something current while you still can. If a picture is all you need, CRW to JPG is the direct route; this page is for when a timeline specifically wants video.

How are my files handled during conversion?

In our testing, a single full-resolution CRW from a 6 MP Canon DSLR, held for 5 seconds at the "Very High" preset, produced a small MKV, since a motionless H.264 frame compresses heavily. Your file is uploaded over an encrypted connection, rendered and packaged into MKV on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public. The main practical limit is upload size and time, since CRW files can run several megabytes each, not your device.