The .crdownload extension appears as soon as a Chromium-based browser starts a download. Chrome, Edge, Brave, or Vivaldi create this temporary file to store data as it is received. Once the transfer is complete, the extension disappears, and the file returns to its original format. The problem arises when the download is interrupted: the .crdownload remains, and the question of what to do with it arises.
Crdownload file and Chromium browsers: a shared mechanism
A point rarely highlighted in usual guides: the .crdownload is not exclusive to Google Chrome. All browsers built on the Chromium engine use the same system. Edge, Opera, Vivaldi, and Brave generate exactly the same type of temporary file during a download.
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The browser gradually adds bytes to the .crdownload file until complete reception. If the transfer succeeds, the .crdownload extension is automatically removed and the file regains its original extension (.pdf, .mp4, .zip). If the transfer fails, the file remains as is in the downloads folder.
This mechanism explains why the file often has a double extension, for example, “report.pdf.crdownload”. The final name is already registered; only the temporary suffix blocks normal access. It is possible to open a crdownload file easily in some cases, provided you understand what lies behind this extension.
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Interrupted download on Chrome: resume or rename the file
When a download stops, the first thing to try is to resume it via the browser’s download manager (Ctrl+J on Windows, Cmd+J on macOS). Chrome keeps a reference to the partial file and can restart the transfer from where it left off, as long as the source server accepts partial download requests.
If the resume fails, another approach is to manually remove the .crdownload extension from the file name. This manipulation works mainly with files that have already been largely downloaded. The result depends on the type of content:
- A partially downloaded video file (.mp4, .mkv) will often be playable up to the point of interruption, with a clean cut at the end.
- A PDF document or a ZIP archive usually requires the entire data to open correctly. Renaming then results in a corrupted file.
- An audio file (.mp3, .flac) behaves similarly to the video: playback is possible up to the point where the data stops.
Renaming does not “repair” anything. It simply allows the operating system to associate the file with the correct software. The content remains the same, complete or not.
Crdownload file on Android mobile: a different operation
On Android, Chrome almost never leaves a .crdownload file visible in user-accessible folders. The writing of partial data occurs in an internal space of the application, and temporary files are automatically deleted after a failure.
This difference in behavior between desktop and mobile explains why the methods described for Windows or macOS do not apply to interrupted downloads on smartphones. On Android, resuming is exclusively done through Chrome’s download manager or by completely restarting the transfer. No file manipulation is possible in visible folders.
Special case of progressive streaming video
When a download concerns a video from progressive streaming (via “Save video as…”), the .crdownload file may contain separate audio and video streams rather than a classic contiguous file. Opening this type of partially downloaded file in a media player can yield unexpected results: video without sound, sound without image, or delays between the two tracks.
This behavior is related to Chromium’s internal management of DASH or HLS segments. A .crdownload file from a video stream is not just a simple truncated file, and standard video repair tools do not always fix the issue.
Antivirus and crdownload files: scanning during download
Modern antivirus suites do not just scan files once the download is complete. Many of them analyze the data as it is written to the .crdownload file, in real-time. This analysis during transfer can cause slowdowns or, in some cases, block an ongoing download if a suspicious signature is detected in the first bytes received.
On the other hand, a .crdownload file left in the downloads folder is not systematically flagged as dangerous by the antivirus. The absence of a recognized extension (.exe, .msi) limits the triggering of automatic alerts. This does not mean the file is safe: a .crdownload renamed to .exe retains the original content, potentially malicious.
Precautions before renaming a crdownload file
- Check the source of the download: a file from an unknown site or a suspicious link remains risky regardless of its extension.
- Scan the file with up-to-date antivirus after renaming, especially for executables (.exe, .msi) and archives (.zip, .rar).
- Do not attempt to force open a file whose size is very different from what is expected: a .crdownload of a few kilobytes for a file supposed to weigh several hundred megabytes contains nothing usable.
The .crdownload file is not meant to be kept. If it remains in the downloads folder after several days, it means the transfer has failed definitively. Restarting the download from the source remains the most reliable solution in most cases. Deleting orphaned .crdownload files frees up disk space without any loss of useful data.