OneDrive: Why is my file size larger on the cloud than on my computer?

Hi Microsoft - onedrive has stopped responding to my ticket, could I get your help?

Hi, Josh Roban

Welcome to Microsoft Q&A forum.

Thanks for your question. What you’re seeing is almost always a reporting or accounting mismatch, not OneDrive “inflating” the actual files. OneDrive does not compress or modify your uploads, but different parts of the service can calculate and display “size” differently, and those numbers can temporarily drift after a large first-time sync.

In particular, the “More details” folder size on the OneDrive website is not guaranteed to be a simple sum of the file sizes shown in the folder listing. It can be based on a separate backend index and may include per-item overhead plus service-side data (for example, metadata and previews), and there are known cases where this value is simply wrong even when file count and individual file sizes look correct. Your 3-file example (318 KB vs 677 KB) is a strong clue that the folder-size calculation is not matching the visible file-size totals.

Here’s the fastest way to verify what is really happening and nudge it back into sync:

Check whether you are actually being “charged” 238 GB

• On OneDrive web, open storage management (“What’s taking up space?”) and compare the account’s total used storage against what you expect. If overall used storage did not jump by 44%, then the 238 GB number is a display bug in folder details, not real usage.

Rule out hidden storage that does count

• On OneDrive web, empty the OneDrive recycle bin. Also quickly search your OneDrive for obvious duplicates or sync-conflict copies (common patterns include “-PCName”, “(1)”, “conflict”).

Force a clean re-index from the client side (most effective fix)

• Reset the OneDrive sync app on Windows using: %localappdata%\Microsoft\OneDrive\onedrive.exe /reset then start OneDrive again from Start.
• If the website still shows inflated folder sizes, unlink and re-link your PC to OneDrive (this does not delete your cloud files, it just rebuilds the local sync relationship).

If after a reset plus unlink/relink your account-level “used storage” still reflects the larger number, that points to a server-side indexing issue rather than anything on your laptop. In that case, use the OneDrive web feedback or support route and reference that file counts match, individual files show no version history, but folder totals are mis-added (your 318 KB vs 677 KB example is a great proof point).

Hope this helps. Feel free to get back if you need further assistance.

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