Copilot Not Working

How to Fix Copilot Pro Limiting PDF Uploads to 1 MB

Algirdas Jasaitis Sep 25, 2026 870 views

Question details

Users are encountering a sudden restriction where Microsoft Copilot Pro limits PDF file uploads to a maximum of 1 MB.

How to Fix Copilot Pro Limiting PDF Uploads to 1 MB

Product: Microsoft Copilot Pro
Device & OS: not provided
Scenario: Uploading PDF documents to Copilot Pro for AI analysis, chatting, or summarization.
Observed behavior: The system rejects PDF files larger than 1 MB, even if the user previously uploaded larger files successfully without any issues.

Before you start

Verify that you are logged into the correct Microsoft account with an active Copilot Pro subscription, and ensure your internet connection is stable before troubleshooting.

Solution 1Recommended

Compress or Split Your PDF File

Use this workaround to bypass the 1 MB limitation by reducing your file size or dividing it into smaller sections.

Because this issue is often tied to server-side changes or account-specific limits enforced by Microsoft, the most immediate fix is to manually reduce your document's size. Compressing or splitting the file allows you to continue using Copilot Pro while waiting for a permanent resolution.

Compress the PDF

Use a trusted PDF editor or an online PDF compression tool to reduce the file size of your document to under 1 MB without losing text quality.

Split the document

If compression is not enough to get the file under 1 MB, use a PDF splitting tool to divide your document into smaller, logical sections such as individual chapters or page ranges.

Upload in smaller batches

Navigate back to the Copilot Pro chat interface and upload the newly compressed or divided PDF files one by one to proceed with your AI tasks.

Tip: Text-heavy PDFs compress very well. If your PDF contains large images that Copilot does not need to analyze, consider removing the images before uploading.

Solution 2

Refresh Your Copilot Pro Session

Refresh your account authentication to resolve temporary glitches or synchronization issues with your subscription tier.

Solution 3

Submit Feedback to Microsoft

Report the file size limitation directly to Microsoft so they can investigate account-specific restrictions.

Free Microsoft Office alternative

Overcome File Limits with WPS Office and WPS AI

If you are frustrated by Microsoft Copilot's upload limitations and fluctuating file size rules, consider switching to WPS Office. It is a free, lightweight, and user-friendly Office alternative that comes with built-in PDF tools and robust AI capabilities. With WPS AI, you can easily summarize, analyze, and chat with your large PDF documents without the hassle of sudden restrictions.

1. Download and install: Download WPS Office for free from the official website and install it on your device.
2. Open your PDF: Launch WPS Office and open your large PDF document directly in the WPS PDF reader.
3. Launch WPS AI: Click on the WPS AI tab on the top ribbon to instantly analyze, summarize, and extract insights from your document.

Free, lightweight, and easy-to-use Office suiteFully compatible with Microsoft Word, Excel, PowerPoint, and PDF formatsBuilt-in WPS AI to effortlessly chat with and summarize large PDF documentsAdvanced PDF tools included to easily compress, split, and edit files nativelyFamiliar user interface for a seamless migration from Microsoft Office

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Frequently Asked Questions

Why is my Copilot Pro suddenly limiting PDF uploads to 1 MB?

Microsoft frequently rolls out service updates, tests new features, or applies temporary resource constraints. Subscription types like university or enterprise accounts may experience fluctuating file size limits due to backend configuration changes.

Does the 1 MB Copilot limit apply to all users permanently?

Not necessarily. Users have reported inconsistent behavior, where the 1 MB limit appears, disappears, and sometimes returns. This indicates it is likely a temporary service limitation or an account-specific rollout rather than a permanent rule for all users.

How can I analyze a large PDF if Copilot rejects it?

Until the restriction is lifted on your account, you will need to use a PDF compression tool to reduce the file size below 1 MB, or split the document into smaller chapters before uploading them sequentially.

Will upgrading my subscription fix the 1 MB limit?

If you are already on a Pro or institutional subscription, the issue is likely a temporary system glitch or policy change rather than a tier limitation. Refreshing your login session or submitting feedback is recommended before altering your subscription.

Microsoft Copilot Issues