A downloaded file that stays a .part or .download on a Mac

The download bar stopped, the browser closed, and what is sitting in your Downloads folder is not the video or the PDF you wanted. It is a file ending in .part, .crdownload, or a .download item that the Finder treats as a package and will not open. Double-clicking does nothing useful.

That suffix is a flag, not a format. It means the transfer never reached the end, and the browser marked the file so nothing would try to read a half-written download as if it were complete.

What the suffix actually means

While a file is coming down, the browser writes bytes to disk under a temporary name. When the last byte arrives and the size matches what the server promised, the browser renames the file to its real name and the suffix disappears. If the connection drops, the browser quits, the Mac sleeps, or the disk fills, the rename never happens.

The suffixes vary by browser. Some use .part, some use .crdownload, and the one that trips people up most on a Mac is .download, which is not a file at all but a folder the Finder displays as a single item. Inside it sits the partial data plus a small plist recording where the download came from and how far it got.

The important consequence: the bytes that did arrive are still there. Whether they are useful depends entirely on what kind of file it was meant to be.

First, try to resume rather than salvage

Salvage is the fallback. Resuming is better, and it takes thirty seconds to find out whether it is possible.

1. Open the browser’s downloads list.
2. Find the interrupted item and look for a resume or retry control.
3. If the server supports range requests and the link has not expired, it picks up where it stopped.

If the item is gone from the list, or resuming restarts from zero, go back to the original page and download again. A fresh download is always better than a repaired partial one, and it is usually faster than any recovery attempt.

Resume is worth one honest attempt even for very large files. Many servers support it, and the cost of trying is a click.

Look inside a .download package

If the file is a .download item and you want to see what is in it, right-click it in the Finder and choose Show Package Contents. You will find a file with the eventual name, often with a .part or similarly suffixed name beside a small plist.

Copy that inner file to your Desktop and rename it with the correct extension. Do not move the original; work on a copy so you can go back.

For a .part or .crdownload file, the equivalent is simpler: duplicate it with Command-D, then rename the duplicate so it ends in the extension it should have had, such as .mp4, .pdf or .zip. The Finder will warn you about changing the extension.

Now check the size. Right-click and choose Get Info, and compare the size against what the download page said the file should be. A file at ninety percent of its expected size has a real chance. A file at five percent almost certainly does not.

What survives a truncated download, by file type

This is where the outcome is decided, and the answer is different for each kind of file.

Video and audio. These are the best case. An MP4 is a long sequence of frames, so a truncated file often contains genuinely watchable footage up to the point where it stopped. The catch is that the index describing where each frame lives is frequently written at the very end, so a player opens the file and reports that it is unreadable even though most of the picture is present. A repair pass that rebuilds the index from the frames on disk is what turns that back into a playable file.

ZIP and other archives. Mixed. A zip stores a directory of contents at the end, so a truncated archive loses the map. Individual entries near the front can often still be extracted, but anything stored after the cut is gone.

PDF. Usually poor. A PDF’s cross-reference table lives at the end, and without it a reader cannot locate any page. Repair can sometimes rebuild that table by scanning for page objects, which recovers the pages that arrived.

Word, Excel and PowerPoint documents. These are zip archives underneath, so they behave like archives. A truncated DOCX often opens partially or not at all.

Images. Poor to middling. A JPEG that stopped halfway typically shows the top of the picture and grey below it, which is sometimes enough to identify the image and never enough to use it. JPEG shows half grey covers what can and cannot be done there.

Repairing the partial file

Once you have a renamed copy with the right extension, a repair tool can try to rebuild whatever structure the missing tail took with it.

Manatee handles this on the Mac in Repair mode. Drop the renamed copy on it and it scans for usable content, rebuilds the index or table it can, and writes a new file alongside. It never modifies the file you gave it. The verdict comes back as Fixed, Partial or Not fixable, and for an interrupted download Partial is the honest and common answer: the first eleven minutes of a video, or thirty-four of forty-one pages.

Everything happens on your Mac, which matters when the interrupted download is something you would rather not hand to a web service. Online file converters: what you give up makes that trade explicit.

One limit worth stating plainly: repair works with the bytes that arrived. It cannot request the missing part of the file from anywhere. If the download stopped at twenty percent, no tool recovers the other eighty.

Why downloads stop in the first place

Worth knowing, because the same cause tends to repeat.

A Mac that sleeps mid-download will usually resume on wake, but a network that changes underneath it (a switch from Wi-Fi to a hotspot, a VPN reconnecting) breaks the connection in a way that resume often cannot repair. A full startup disk stops a download silently and leaves a partial file behind; your Mac says the disk is full when Finder says it is not is a common version of this. Links from file-sharing services frequently expire or limit each session, which is why a retry sometimes starts over from zero.

For anything large, downloading while plugged in, on a stable connection, and with the lid open removes most of these at once.

Questions

Can I just rename a .part file and use it? Sometimes. If the download was ninety-nine percent complete, a renamed video may well play. If it was half done, renaming only gets you a file that opens and then fails.

Does the .download folder contain the whole file? It contains as much as arrived, plus metadata about the source. It is not a compressed or encoded form of the complete file.

Is it safe to delete these leftovers? Yes, once you have either resumed the download or given up on it. They are working files and nothing else depends on them.

Why did the file download completely but still arrive broken? That is a different problem: the bytes arrived but some of them are wrong. Verifying a file arrived intact shows how to check rather than assume.