Merge PDF copies every page from two or more selected PDFs into one document, following the order shown in the file list.
InputTwo or more PDFs
OutputOne merged PDF
RequirementsAt least two readable PDF files are required. The current list supports removal but not drag reordering.
Step-by-Step Instructions
Follow these essential instructions to achieve optimal results when using Merge PDF:
Select or drop two or more PDFs.
Review the file list and remove any incorrect file.
Confirm the list order is the desired page order.
Select Merge PDFs and review the combined download.
Interactive Tutorial
Visual Step-by-Step Walkthrough
Follow these real interface screenshots captured directly from Merge PDF. Every step highlights the exact buttons, selections, and downloads. Click any screenshot or "Launch Fullscreen Viewer" to inspect in high resolution.
Step 1 of 8 Upload Drop Zone (#drop)
Open Merge PDF
What to do:
Open the Merge PDF tool and locate the central upload area.
What you will see:
The drag-and-drop box displays "Drop PDFs here or click to upload" and accepts multiple files.
Next:
Click anywhere inside the dashed drop zone or drag your documents directly over it.
Tip:
Make sure your browser has permission to select files from your local storage.
Step 2 of 8 File Browser (#fin)
Select PDF Documents
What to do:
Click the upload zone and select two or more PDF files you wish to merge into a single document.
What you will see:
Your operating system file chooser opens, allowing you to highlight multiple PDF documents.
Next:
Confirm your file selection in the dialog to load them into the workspace.
Tip:
You can select multiple files at once by holding Ctrl (Windows) or Cmd (Mac) in the file picker.
Step 3 of 8 Document List (#flist)
Check Loaded Documents
What to do:
Review the file cards that appear in the document queue.
What you will see:
Each selected file shows its PDF icon, file name, formatted file size in MB, and a removal button.
Next:
Verify that all desired files are present before continuing.
Tip:
If an unwanted document was accidentally added, click its red "×" button to remove it.
Step 4 of 8 Queue Reordering (#flist .file-item)
Arrange Document Order
What to do:
Check the sequential order of files from top to bottom.
What you will see:
The list reflects the exact sequence that pages will follow in the final merged document.
Next:
Adjust or re-add documents until your desired page order is set.
Tip:
The document at the top of the list will become the first pages of your new combined PDF.
Step 5 of 8 Merge Action Button (#mergeBtn)
Click Merge PDFs
What to do:
Click the primary "Merge PDFs" button located below the document queue.
What you will see:
The button activates once two or more valid PDFs are loaded in the queue.
Next:
Click the button to start combining documents entirely within browser memory.
Tip:
Merging occurs 100% locally on your computer—no files are sent to remote servers.
Step 6 of 8 Progress Bar (#prog, #pbar)
Wait for Processing
What to do:
Observe the animated progress bar and status indicator as pages are copied.
What you will see:
The progress bar advances from 10% to 100% and displays "Merging PDFs…".
Next:
Allow the local WebAssembly/JavaScript engine to complete page assembly.
Tip:
Large documents with hundreds of pages may take a few seconds to compile in memory.
Step 7 of 8 Review Section (#generatedPreview)
Review Merged Document
What to do:
Inspect the generated preview frame to confirm that pages combined successfully.
What you will see:
A mandatory review panel appears with an embedded PDF preview and the default file name.
Next:
Scroll through the preview pages, then click "Continue to download".
Tip:
You can customize the output file name directly in the file name input box before saving.
Step 8 of 8 Download Dialog (#dlModal .btn-success)
Download Combined PDF
What to do:
Click the green "Download" button in the download dialog.
What you will see:
The ready-to-download modal displays the file name, final size, and green download button.
Next:
Click Download to save the merged PDF directly to your device storage.
Tip:
Check your browser downloads folder for your new combined document.
Tips & Best Practices
Choose files in the order you want them merged.
Keep the originals until page order and bookmarks are checked.
Common Mistakes to Avoid
Selecting fewer than two files.
Assuming filenames are automatically sorted alphabetically.
Troubleshooting & FAQ
If one file fails, remove it and test that PDF separately in Repair PDF.
If the browser blocks multiple downloads elsewhere, allow downloads for the site.
Frequently Asked Questions
Can I reorder files after selecting them?
The page currently merges in the displayed selection order.