Free online CRDOWNLOAD to WEBM converter

What the CRDOWNLOAD format is

.crdownload is a temporary filename extension used by Google Chrome and Chromium-based browsers, including Microsoft Edge, while a file is downloading. It is not a video format or a separate media container. The browser normally removes the suffix and restores the original filename after the download completes.

A CRDOWNLOAD file can contain a WebM, MP4, PDF, archive, or another file type. An interrupted download may be truncated, lack the container metadata needed for playback, or contain no usable media stream. Renaming video.crdownload to video.webm does not convert it.

What the WEBM format is

WebM is an Internet-focused media container commonly used for browser video, streaming, web pages, and lightweight sharing. It typically contains VP8 or VP9 video and Vorbis or Opus audio; AV1 video is also supported in some WebM workflows.

WebM provides good web playback support and efficient compression, particularly with VP9 or AV1. It is a suitable target when the destination is a modern browser or a video service that specifically accepts WebM. Older players, editing applications, and some mobile devices may support MP4 more consistently.

How to convert a CRDOWNLOAD file to WEBM

1. Check Chrome's download list with Ctrl+J. Resume the download if possible and wait until Chrome removes the .crdownload suffix.
2. If the completed file has a non-WebM extension, use that original file. If the download is still incomplete, make a copy before testing it.
3. Install FFmpeg, then inspect the file with ffprobe "video.crdownload". A detected video and audio stream indicate that conversion may be possible; an error such as “Invalid data found when processing input” usually means the partial file cannot be converted reliably.
4. Transcode a readable source to VP9 video and Opus audio with:

ffmpeg -i "video.crdownload" -c:v libvpx-vp9 -crf 32 -b:v 0 -c:a libopus -b:a 128k "video.webm"

Replace the input filename with the completed downloaded filename when available. Lower VP9 -crf values improve quality and increase size; values around 28–35 are common starting points. For a video without audio, add -an instead of using the audio options.

If ffprobe confirms that the source is already a complete WebM file, avoid re-encoding with:

ffmpeg -i "video.crdownload" -c copy "video.webm"

Copying streams is faster and preserves quality, but it works only when the file is complete and its streams are compatible with the WebM container.

You can also convert the file on the 101convert.com website for free without installing software. Upload only a completed, readable media file; an interrupted CRDOWNLOAD may be rejected or produce an unusable result.

Quality, compatibility, and limitations

Transcoding a damaged download cannot reconstruct missing bytes, frames, or audio. If the original download can be resumed, completing it is preferable to converting the partial file.

Re-encoding changes the video and can reduce quality, while stream copying does not. VP9 and Opus are suitable for current browsers, but choose MP4 with H.264/AAC when the destination requires broad legacy-device compatibility. Keep the original completed download because converting to WebM may remove features or metadata supported by its original container.