Combine multiple PDF files into one PDF, free. Drag to reorder, then download. Files stay on your device. No signup, no upload, no watermark.
Drop PDFs here or click to browse
Up to 20 files · 100 MB total · PDF
Drag and drop or click to browse. Up to 20 PDF files, 100 MB total.
Drag rows up or down to set the page order in the merged PDF.
Click Merge. Your combined PDF downloads instantly. No server, no upload.
Merge PDF is a free online tool that combines two or more PDF files into a single document, directly in your browser. There is no signup, no upload, and no watermark. Your PDFs are processed locally on your device using a small open-source library called pdf-lib, and they never travel to a server.
Most people combine PDFs every week without thinking about it. You bundle a stack of scanned receipts before submitting an expense report. You stitch together a contract that came back signed in three separate parts. You join a slide deck with the appendix your colleague sent later. You assemble study notes into one printable file before an exam. The pattern is the same every time: several PDF files in, one PDF file out, in the order you want.
Splitting that workflow across several apps wastes time. Doing it in your browser takes seconds, costs nothing, and keeps the documents on your machine.
Open the tool above. Drag your PDF files onto the dropzone, or click it to pick them from your file browser. Each file shows up as a row with the page count and size, so you can confirm you grabbed the right ones.
Drag the rows up or down to set the order pages will appear in the merged PDF. The row at the top becomes the first page of the output. Hit the Merge button and the combined file downloads immediately as merged.pdf. You can keep going by clicking Merge more PDFs, or close the tab and the work is done.
The current limits are 20 PDF files and 100 MB combined per merge. Those keep the browser responsive on older laptops. If you need to merge more, do it in two passes: merge the first batch, then add the result to the next batch.
The tool runs in any modern browser, so the same page works the same way on every operating system. On Windows or Mac, drag PDF files from File Explorer or Finder onto the dropzone. On a Chromebook, drag from the Files app. The browser handles the rest.
On iPhone and iPad, tap the dropzone and the iOS file picker opens. You can pick PDFs from the Files app, iCloud Drive, Google Drive, Dropbox, or any other provider you have installed. Reorder by dragging the row handles with your finger. On Android, the flow is identical through the system file picker.
Because everything happens in the browser, there is nothing to install. No app store review, no permissions to grant, no background processes left running after you are done.
Most online merge-PDF services upload your files to a server, run the merge there, and send the result back. That works, but it has tradeoffs. Your documents, which often contain personal, financial, or confidential information, pass through a third party. Free tools also frequently impose file-count or size limits, watermark the output, or require an account after the first use.
ReezoAI Merge PDF runs entirely on your device. The same modern browsers that play video and run web games can also parse and rewrite PDFs. We use the well-tested pdf-lib library to load each file, copy every page in the order you set, and emit a single new document. Nothing is uploaded. Nothing is stored. There is no server to breach because there is no server in the loop.
No. Pages are copied byte-for-byte into the new document. Text remains selectable. Images keep their original resolution. Embedded fonts and form fields carry over. Re-rendering steps that some compression-style mergers run, which can soften text or banding gradients, do not happen here. The merge is lossless.
The current version handles file-level merging: add up to 20 PDFs, drag rows to set their order, and download the combined output. We do not yet support per-page reordering across files, password-protected PDFs, or compression. Those are planned for separate tools so that the merge experience stays fast and focused.
Your PDFs never leave your computer. We do not see them, we do not store them, and they are not sent to any server, including ours. You can verify this by opening your browser's Network tab while you merge: there are no upload requests for the file data.
Yes. Completely free, forever. No signup, no watermark, no daily limit, no upgrade prompt. Use it as much as you want.
No. The merge runs entirely in your browser using pdf-lib. Your files never leave your device. You can confirm this by checking your browser Network tab.
You can merge up to 20 PDF files at once, with a combined size of up to 100 MB. These limits keep merging fast and avoid browser memory pressure.
Not in this version. Encrypted PDFs are skipped and flagged. Remove the password from your PDF in your viewer first, then merge.
No. Pages are copied without re-rendering, so text stays sharp, images keep their original resolution, and embedded fonts are preserved.
Not in this version. Only file-level reordering is supported. A dedicated Split PDF tool is on the way that will handle per-page operations.
There is no fixed page-count cap. As long as your combined input stays under 100 MB and 20 files, the output can be hundreds or thousands of pages.
Yes. The drag-to-reorder interface works on touch devices, and you can pick PDFs from your phone file picker or cloud storage.
Open this page in Safari, Chrome, or Firefox. Drag PDFs from Finder onto the dropzone, drag rows to set the order, then click Merge. The combined PDF saves to your Downloads folder. No app to install and no Preview app workarounds.
Open this page in Edge, Chrome, or Firefox. Drag PDFs from File Explorer onto the dropzone, set the order by dragging rows, then click Merge. The merged PDF lands in your Downloads folder. No Adobe Acrobat license needed.
Yes. Tap the dropzone and pick PDFs from the Files app, iCloud Drive, Google Drive, or Dropbox. Reorder by dragging the row handles, then tap Merge. Save the result back to Files or share it directly from the download prompt.
Yes. There is no signup, no login, and no email required. The tool runs entirely in your browser, so there is nothing to register for. Open the page, merge, close the tab.