A file with the .crdownload extension appears in your downloads folder as soon as a Chromium-based browser starts transferring a document, video, or program. This temporary file stores the received data progressively, byte by byte, until the download is complete.
Once the transfer is finished, the .crdownload extension disappears and the file returns to its original format (.pdf, .mp4, .zip, etc.). The problem arises when this file gets stuck, the download fails, or Chrome crashes unexpectedly.
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Why a .crdownload file gets stuck in your folder
The most common cause is a network interruption. A Wi-Fi disconnection, a router restart, or a server-side timeout is enough to freeze the transfer. Chrome then keeps the .crdownload file in the exact state it was in at the moment of the interruption.
Several recent security suites (Microsoft Defender, Avast, Bitdefender) mark .crdownload files as “incomplete” or “unscannable” until the download is finished. This behavior can prevent them from being renamed or manipulated, even when you know exactly what the file contains.
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Another scenario is insufficient disk space. If your disk fills up during the transfer, Chrome interrupts the writing without deleting the partial file. The .crdownload then remains orphaned, sometimes large, with no possibility of automatic resumption.
For those who wish to open a crdownload file with Blog du Net, the process relies on a few preliminary checks that we detail below.
Chrome download resumption: the mechanism to know before any manipulation
Since versions 118 to 120 of Chrome, the smart resumption feature has become more effective. The browser automatically attempts to resume an interrupted download using HTTP Range requests, even switching to an alternative mirror when the original server is unresponsive.
Specifically, before touching the .crdownload file, first check the page chrome://downloads. If the download shows a “Resume” button, click it. Chrome will stitch the pieces back together from the point of interruption. This approach is significantly more reliable than any manual manipulation.
Resumption works under one condition: the remote server must accept partial requests (Accept-Ranges header). Most modern hosts allow this, but some older servers or certain sharing platforms reject these requests. In this case, Chrome will restart the download from the beginning.
Renaming a .crdownload file to open it: when it works and when it breaks everything
The most common method is to remove the .crdownload extension to keep only the original extension. For example, renaming “document.pdf.crdownload” to “document.pdf”. This technique is based on a simple fact: the .crdownload file already contains the downloaded data, in order.
This approach yields very different results depending on the type of file concerned:
- Video files (.mp4, .mkv, .avi) are often partially playable. A player like VLC can read the downloaded portion, with a clean cut where the transfer stopped.
- Compressed archives (.zip, .rar, .7z) generally require complete integrity. A renamed partial file will be flagged as corrupted by most decompressors, unless the download was nearly complete.
- PDF files pose a particular problem: their internal table of contents (xref) is located at the end of the file. An incomplete PDF, even at 95%, may not open at all in a standard reader.
- Images (.jpg, .png) may display partially, with the lower part of the image missing or grayed out.
Before renaming anything, check the size of the .crdownload file. If it is close to the expected size of the final file (check the download history for this information), renaming is likely to produce a usable result. If the file is only a few kilobytes while you were expecting a file of several hundred megabytes, the content will be unusable and renaming will change nothing.
.crdownload file and security: precautions to take
A .crdownload file has not been scanned by your system’s antivirus. Chrome’s security scan usually occurs at the end of the download, once the file is complete. A file that remains as .crdownload has therefore escaped this check.
If you decide to rename and open a .crdownload file whose source you are not certain of, run a manual scan with your antivirus before opening it. This precaution is especially important for executable files (.exe, .msi) and Office documents that may contain macros.
The available data does not allow quantifying the actual risk of infection via a partial .crdownload file. However, the basic principle remains the same as for any downloaded file: the source of the download determines the level of trust, not the file extension.
Chromium browsers affected by the .crdownload extension
The .crdownload extension is not exclusive to Google Chrome. All browsers built on the Chromium base use (or have used) this same temporary file mechanism:
- Google Chrome (all versions)
- Brave, Opera, and Vivaldi, which share the Chromium download engine
- Microsoft Edge, with a nuance: since 2023, Edge has abandoned the .crdownload extension in favor of its own temporary file system
The majority of .crdownload files encountered today come from Chrome, Brave, or Opera. If you are using Firefox, the equivalent is the .part extension, with similar functionality but a different resumption mechanism.
A .crdownload file is not a complete format; it is a transitional state. The first reaction should always be to attempt resumption via chrome://downloads rather than manipulating the file directly. Renaming remains a last resort, useful mainly for partially downloaded multimedia files, and rarely effective for archives or executables.