You have three separate PDFs: the contract from legal, the appendix from finance, and the signed cover page from the client. One email attachment, three files. Sending them separately risks a reviewer missing the appendix — or worse, opening them out of order. Adobe Acrobat charges $19.99 a month to merge PDFs. PDFKits does it in under 30 seconds, free, without creating an account.
This tool is built for anyone who regularly assembles multi-part documents — office managers compiling quarterly reports, students binding dissertation chapters, paralegals preparing court filings, or freelancers packaging proposals. Upload your files, drag to set the order, click Merge. The result downloads as a single clean PDF preserving every page's original fonts, images, and resolution. No watermark is added. Nothing is uploaded to a server.
Drag your files directly into the tool, or click to open a file picker. You can select multiple PDFs at once — there is no enforced count limit. The tool reads the files locally from your device memory; nothing is sent anywhere. Each file shows a thumbnail of its first page so you can confirm you picked the right documents before proceeding. A 10-file, 50MB stack typically loads in under two seconds on a standard laptop.
Drag the file cards into the sequence you need. The merged PDF follows this order exactly, page by page. Drop the cover page first, the main report in the middle, the appendix at the end. If you accidentally added the wrong file, remove it without starting over. You can also add more files after the initial upload — click the plus button to keep stacking documents.
Click Merge PDF. Your browser uses pdf-lib, a JavaScript library, to assemble the pages without any server call. A set of five 3MB PDFs typically merges in 3 to 6 seconds depending on image density. The combined file downloads directly to your device. Open it in any PDF reader — Adobe Reader, Preview, Chrome, or your phone's built-in viewer — and every page will render exactly as it did in the original. Your files never leave your browser at any point in this process.
An HR manager receives 20 résumés as individual PDF attachments over a week. Before the hiring committee meeting, she merges all candidates into a single paginated document, making it easier for reviewers to compare and annotate without juggling 20 attachments.
A PhD student submitting a thesis must combine the main document, three appendices, a bibliography, and a signed ethics declaration — each exported separately from different software. PDFKits merges them into one submission-ready file in under a minute.
A paralegal assembling a court brief bundles the filed motion, exhibits A through G, and a certificate of service. All processing on PDFKits stays on her local machine, satisfying her firm's policy against uploading client documents to external cloud services.
A freelance consultant sends clients a project package: scope document, timeline, pricing breakdown, and signed NDA. Four PDFs become one professional attachment — no cloud storage link, no zip file, just a clean single document.
An agent combines a property listing, floor plan, inspection report, and disclosure form before forwarding the complete package to a buyer. One merged PDF instead of four attachments means nothing gets lost in the thread.
Adobe Acrobat requires a $19.99/month subscription to merge PDFs. Smallpdf and iLovePDF limit free users to two tasks per day and cap file sizes at 15–25MB. PDFKits imposes none of these restrictions.
| Feature | PDFKits | Smallpdf | iLovePDF | Adobe Acrobat |
|---|---|---|---|---|
| Cost | Free, always | 2 tasks/day free | 2 tasks/day free | $19.99/month |
| Files stay on your device | Yes | No — cloud | No — cloud | No — cloud |
| Watermark on output | None | Added on free plan | Added on free plan | None |
| File size limit | None | 15MB free | 25MB free | None |
| Login required | No | Optional | Optional | Yes |
The privacy gap is the most important difference. When you upload a file to Smallpdf or iLovePDF, it sits on their servers for up to an hour before deletion. PDFKits never receives the file — the merge happens entirely in JavaScript running in your tab.
Yes, permanently. There is no subscription, no free trial that expires, and no premium tier to unlock. PDFKits is funded by advertising, not by charging users for PDF operations.
No. The entire merge runs in your browser using JavaScript. Your PDFs never leave your device and are never sent to PDFKits' servers or any third party.
There is no enforced size limit. The practical limit is your device's available RAM. Most modern computers handle 500MB of total input without problems.
No. Pages are copied at their original resolution. Fonts, images, vector graphics, and embedded objects are preserved exactly as they appear in the source files.
PDFKits Merge PDF works at the file level. To reorder pages within a single PDF, use the Rearrange Pages tool first, then merge the result with your other files.
Yes. Open pdfkits.app in any modern browser — Safari on iPhone, Chrome on Android, or any desktop browser. No app installation is required on any platform.
Because no file data leaves your device, PDFKits collects nothing through its PDF tools. This approach satisfies GDPR data minimization requirements by design, with no processing agreement needed.
No. Password-protected PDFs cannot be read by the tool. Unlock them first using PDFKits Unlock PDF, then merge the unlocked copies.
A missing page usually means the source PDF is corrupted or uses unsupported encryption. Run the problematic file through PDFKits Repair PDF, then try the merge again.
Download the files to your device first, then open them in PDFKits. Direct cloud storage integration is not currently available.