Merge PDF Files Online
Combine multiple PDFs into one document — free, fast, and private.
Drag & drop PDF files here
or click to browse
Max 50MB per file · 100MB total
How it works
Upload your PDFs
Drag and drop or click to select multiple PDF files from your device.
Arrange the order
Drag to reorder files so they appear in the right sequence in the final document.
Merge & Download
Click Merge, then download your combined PDF — all processed in your browser.
About this tool
When you need to assemble a report from separate contributor drafts, consolidate months of bank statements into a single archive, or package a contract alongside its signed attachments, juggling individual PDF files is unnecessary friction. ToolkitFlow's PDF Merger combines any number of documents into one clean, sequential file — processed entirely within your browser using pdf-lib, a WebAssembly-based PDF engine. No file ever leaves your device, no account is required, and the merge completes in seconds.
The drag-to-reorder interface is where the real value lives. Upload your files in any order, then drag them into the exact sequence you want — chapter by chapter, section by section, or any structure that fits your document. Once you click Merge, every page from every file is stitched together in order, preserving fonts, embedded images, vector graphics, and hyperlinks exactly as they appeared in the originals.
Common Use Cases
- ›Combining monthly bank or investment statements into a single year-end archive for tax preparation
- ›Assembling multi-author reports by merging each contributor's section into one submission file
- ›Packaging a contract with its signed addenda, exhibits, and schedules as one deliverable
- ›Joining separately downloaded course handouts or lecture slides into one study document
- ›Bundling scanned receipts and invoices into a single expense report attachment
Privacy & Security
All PDF processing runs directly in your browser using WebAssembly and pdf-lib. Your files are never uploaded to any server — everything is processed locally on your device, so your documents remain completely private even without an internet connection.
Frequently Asked Questions
How many PDFs can I merge at once?
There is no hard limit on the number of files. The practical ceiling is your browser's available memory. On most modern devices, merging 20–30 average-sized PDFs — a few megabytes each — works without issue. For very large batches, merging in two rounds (merge 10 files, then merge the results) keeps memory usage manageable.
Does merging change the quality of images or text in my PDFs?
No. The merger copies every page directly from the source PDFs without re-encoding text, fonts, or images. The output is bit-for-bit identical to the originals — there is no quality loss at any stage.
Can I merge password-protected PDFs?
Only unlocked PDFs can be merged. If a file requires a password to open, the tool will show an error for that file. Remove the password using an unlock tool first, then add the unlocked version to the merge.
Are hyperlinks and bookmarks preserved in the output?
Hyperlinks and annotations embedded within page content are preserved. Document-level bookmarks (the navigation outline panel) from the source files are not carried over — only the page content is combined.
What is the maximum total file size?
The tool works well with combined inputs up to around 100 MB. Very large files will still process but may take longer on older hardware or when many browser tabs are open.