PDF editing & conversion
What to do when a large file is slow on your phone
Reduce processing load while keeping the original documents safe.
Processing uses your device
FormFile handles selected files in the browser. Large images, many PDF pages and AI enhancement can require substantial memory and processing time. A file below the upload limit may still be demanding to process on a lower-memory phone.
Start with a smaller batch
Use fewer files or select only the PDF pages you actually need. This version accepts up to 20 files per tool session, 30 MB per file and 100 MB total. Rendering and target-size PDF reconstruction are limited to 40 selected pages.
Keep work recoverable
Download finished outputs before refreshing or closing the tab. The working files are held in memory, so a refresh can clear the session. Cancel an operation if you need to revise settings rather than repeatedly pressing Process.
Choose the useful output
Avoid unnecessarily high rendering resolution or AI enlargement for ordinary document preparation. If a large task remains unreliable on the phone, use a more capable device with the same original files. Check every downloaded result before submitting it.
Ready to prepare your file? Use PDF target size and check the downloaded result.