Other PDF Issues

Fix: Unable to Attach PDF Files Larger Than 10 MB in Acrobat Reader Mobile

John Wilson Oct 19, 2026 868 views

Question details

The user is unable to attach a PDF form in Acrobat Reader Mobile due to an error stating the file exceeds the 10 MB limit, despite the file appearing to be within that limit.

How to Fix the 10 MB File Limit Error in Acrobat Reader Mobile

Product: Adobe Acrobat Reader Mobile
Device & OS: not provided
Scenario: Attaching or combining a PDF document (such as an EasyJet form) using a mobile PDF reader application.
Observed behavior: The application blocks the attachment or combination process, displaying a strict or false 10 MB file size limit error.

Before you start

Check the exact file size of your PDF document using your mobile device's built-in file manager to confirm whether it truly exceeds 10 MB or if the app is misreporting the size.

Solution 1Recommended

Compress the PDF to Meet Size Limits

If your PDF is hovering around or slightly above 10 MB, compressing the file ensures it can be attached without triggering the app's restrictions.

PDF forms can sometimes contain hidden metadata or unoptimized fonts that inflate their size. Using a mobile PDF compressor reduces the file footprint while maintaining document readability.

Open a PDF compression tool

Launch a dedicated PDF editor or a free online PDF compression tool in your mobile web browser.

Upload the target file

Tap 'Select File' and locate your EasyJet form or the specific PDF causing the error in your device storage.

Select compression level

Choose a 'Medium' or 'High' compression setting to ensure the output file drops well below the 10 MB threshold.

Save and re-attach

Download the compressed PDF to your device, open Acrobat Reader Mobile, and attempt to attach or combine the newly optimized file.

Quality Retention: Standard text-based forms compress exceptionally well with almost no visible loss in quality.

Solution 2

Clear App Cache to Fix Misreported Sizes

Sometimes the app miscalculates file sizes due to corrupted temporary data. Clearing the cache can resolve false 10 MB limit errors.

Solution 3

Change Your File Sharing Workflow

Verify you are using the correct sharing method, as premium features like 'Combine Files' may have different processing limits compared to simple email attachments.

Professional Mobile PDF Solution

Manage and Compress Large PDFs with WPS Office

Avoid restrictive 10 MB attachment errors by managing your PDFs with WPS Office. WPS Office provides powerful built-in PDF compression and seamless sharing options, allowing you to handle large forms effortlessly on your mobile device.

1. Install WPS Office: Download and launch WPS Office on your mobile device.
2. Open the PDF: Locate and open your PDF form directly within the WPS PDF viewer.
3. Compress the file: Tap 'Tools' at the bottom menu, navigate to the PDF tab, and select 'PDF Compress' to easily reduce the file size.
4. Share the document: Tap 'Share' to seamlessly send your optimized PDF via email or standard messaging apps without hitting the 10 MB limit.

Easily compress large PDFs directly on mobile to bypass email and app size limits.Smoothly fill, sign, and share standard PDF forms like travel documents.Highly compatible with standard Adobe PDF and Microsoft Office formats.Lightweight, all-in-one mobile app that doesn't restrict basic file sharing.

Frequently Asked Questions

Why does Acrobat Reader Mobile say my file is over 10 MB when it is actually smaller?

This often happens due to cached data errors, hidden form metadata, or embedded high-resolution fonts temporarily inflating the processed size in the app's memory. Clearing the app cache or running the file through a PDF compressor usually resolves the false warning.

What is the standard file size limit for email attachments on mobile?

Most standard email providers, such as Gmail and Outlook, allow attachments up to 20 MB or 25 MB. If a specific PDF reader app limits you to 10 MB, it is an internal application restriction, not a general email limitation.

How can I check the true exact size of my PDF on my mobile phone?

Open your device's native File Manager app (such as 'Files' on iOS or 'My Files' on Android), locate your saved PDF document, long-press the file icon, and select 'Get Info' or 'Details'. This will display the accurate file size in kilobytes (KB) or megabytes (MB).

Does combining multiple PDFs increase the overall file size?

Yes. When you combine PDF files, the resulting document merges the text, images, fonts, and metadata of all the selected files. Depending on the contents, this combined file can quickly exceed app-specific processing limits like 10 MB.

PDF Troubleshooting