Can File Explorer show file sizes in bytes instead of kb?

No. File Explorer’s Size column cannot be changed from KB to bytes; Windows has no built-in setting or registry option for this.

For one file, right-click it, select Properties, and check Size. The exact value appears in parentheses, for example: 1.20 MB (1,258,291 bytes).

To display every file in the current folder in bytes, open the folder, click the address bar, type powershell and press Enter. Then run:

Get-ChildItem -File | Select-Object Name, @{Name="Size in bytes";Expression={$_.Length}}

This only reads the file information and does not modify anything.

Microsoft reference: https://learn.microsoft.com/en-us/answers/questions/2412074/display-file-size-in-bytes-on-windows-explorer

unfortunately not - AFAIK, File Explorer cannot be configured to display file sizes in bytes in the main file list; it automatically uses KB, MB, GB, and larger units as appropriate. If you need the exact size in bytes, right-click the file, select Properties, and view the Size field, which shows the precise byte count (along with the rounded Size on disk). Alternatively, you can add the Size column details or use PowerShell (for example, Get-ChildItem | Select-Object Name, Length) to display exact file sizes in bytes for multiple files.

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hth

Marcin