Can I delete a .crswap file?

Yes, if no app is actively saving. It is an abandoned temporary scratch file.

What creates .crswap files?

Chrome and ChromeOS web apps using the File System Access API, which write to a .crswap before swapping it into the real file.

Can I open a .crswap file?

Not usefully — it holds partial, mid-write data. Open the actual saved file instead.

What Is a .CRSWAP File?

A .crswap file turned up while an app was saving. It is a temporary scratch file. Here is what makes it and when it is safe to remove.

What a .crswap file is

A .crswap file is a temporary scratch file used by Chrome and ChromeOS's file system while an app saves data. Web apps that use the File System Access API write changes into a .crswap first, then atomically swap it into place so a crash can't leave a half-written file.

Why it is still there

If you see a leftover .crswap, the save was interrupted before the swap completed. The real file usually still holds its last good version.

Is it safe to delete?

Yes, if no app is currently saving. A stray .crswap is an abandoned temporary file and holds only partial, unswapped data.

Can you open it?

Not usefully — it is mid-write scratch data, not a finished file. Open the real file instead.