How to Fix PDF Compression Stuck or Not Working
Question details
The user is unable to compress PDF files, with compression tasks remaining stuck in progress for days despite having an active subscription.
- Product
- PDF Editor / Adobe Scan
- Device & OS
- not provided
- Scenario
- Attempting to reduce the file size of a scanned or standard PDF document using a mobile or desktop PDF application.
- Observed behavior
- The compression process fails to complete, hanging indefinitely in the 'in progress' state.
Ensure that your internet connection is stable if you are using a cloud-based compression tool, and check if you have sufficient storage space available on your device to save the compressed file.
Test with a Different PDF to Isolate File-Specific Issues
Determine if the compression issue is caused by a specific corrupted or overly complex PDF file.
Sometimes, a PDF file may contain complex vector graphics, flattened layers, or hidden data that causes compression algorithms to freeze or fail. Testing another file helps identify if the app is at fault or just the document itself.
Find a different, preferably smaller and simpler PDF file on your device.
Upload or open this alternative PDF in your PDF compression app and initiate the compression process.
If the test file compresses successfully, your original file might be corrupted or require flattening. If the test file also gets stuck, the issue lies with the application itself.
Update the PDF Application and Restart Your Device
Resolve background glitches and ensure compatibility by updating to the latest app version.
Compress PDFs Quickly and Reliably with WPS Office
If your current PDF tool is stuck or consistently failing to compress files, switch to WPS Office. Its built-in PDF compressor quickly reduces file sizes while maintaining excellent visual quality, functioning seamlessly entirely offline or on the cloud.
- 1. Open your PDF in WPS Office: Launch WPS Office on your device and open the PDF file you wish to compress.
- 2. Access the PDF Compressor: Navigate to the 'Tools' tab on the top ribbon and select the 'PDF Compressor' option.
- 3. Choose your compression level: Select your desired compression quality (HD, Normal, or Basic) based on how small you need the file to be.
- 4. Compress the file: Click 'Compress' to instantly reduce the file size, bypassing any previously stuck workflows.
- 5. Save your compressed PDF: Save the newly optimized document to your local storage or cloud drive.
Frequently Asked Questions
Why is my PDF compression stuck at 99%?
This usually happens due to a dropped internet connection during a cloud-based compression upload/download, or because the final rendering stage of the file contains heavily layered images that the app struggles to process.
Does compressing a PDF reduce its visual quality?
Yes, compression typically works by downsampling images and removing hidden background metadata. While it reduces the file size significantly, high compression levels can make images look pixelated. Text usually remains perfectly readable.
Can I compress a password-protected PDF?
Most PDF applications cannot compress encrypted or password-protected files. You must first unlock the file by entering the correct password and removing the encryption before running the compression tool.
