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Upload your PDF files by dragging them into the upload area or clicking to browse. Arrange the files in your desired order by dragging them in the list. Click the Merge button, and your combined PDF will download automatically. The entire process takes just seconds.

Yes, PDF merging is completely lossless. All pages, images, text, fonts, and formatting from your original files are preserved exactly. The merged file contains identical content to the source PDFs without any quality degradation or compression.

You can merge any number of PDF files in a single operation. For optimal performance with very large batches (50+ files or hundreds of megabytes total), consider merging in smaller groups. Most users merge 2-20 files at a time without any issues.

Yes, you can reorder files before merging by dragging them in the list or using the up/down arrows. The final PDF will contain pages in exactly the sequence you arrange. For reordering individual pages within a PDF, use our Split tool first to extract pages, then merge them in your desired order.

Yes, bookmarks from each source PDF are maintained in the merged document. Internal hyperlinks within each original document continue to work. External links (URLs) remain clickable. Cross-document links may need adjustment after merging since page numbers change.

Protected PDFs must be unlocked before merging. If your PDFs require a password to open, you'll need to remove the protection first using the original password. Our merger cannot bypass PDF security — this protects document owners' rights.

Individual PDF files can be up to 100MB each. The total combined size of all files should not exceed 500MB for optimal processing. For very large documents, consider compressing them first using our Compress PDF tool, or merge in batches.

Most merges complete within seconds. Processing time depends on the total file size and number of pages. A typical merge of 5-10 documents (under 50MB total) finishes in 2-5 seconds. Larger merges may take 10-30 seconds.

Yes, our PDF merger works on any device with a modern web browser including iPhones, iPads, Android phones, and tablets. The interface adapts to your screen size, and you can drag-and-drop or tap to upload files. No app installation required.

Fillable form fields from each source PDF are preserved in the merged document. Each form field retains its properties including field names, validation rules, and any entered data. However, if multiple PDFs have form fields with identical names, you may need to rename them after merging.

Yes, you can merge PDFs with different page sizes (Letter, A4, Legal, custom sizes) and orientations (portrait, landscape). Each page retains its original dimensions in the merged file. PDF viewers display mixed-size pages correctly.

Yes, you can merge any combination of PDF types: scanned documents, digitally-created files, forms, and image-based PDFs. Each page retains its original characteristics—scanned pages stay as images while text-based pages remain searchable. The merged file seamlessly combines all content.