Merge PDF Files Online: Combine PDFs Into One, Free
Add your PDFs, put them in the right order, and download one file. Text, images and page layouts are kept, and your files stay on your device.
Drop PDF files here or click to browse
Add two or more PDFs. You can add files more than once.
Step 2: Set the order. Use the arrow buttons, or drag a row on a computer. The merged PDF follows this order.
Merging…
Merging happens in your browser, so your PDFs are not uploaded to our servers.
How to Merge PDF Files Online
Merging PDFs means combining several PDF files into one document, in the order you choose. This free tool does it in your browser: add your files, arrange them, and download a single PDF. Pages are copied from your files as they are, so the result is not a set of screenshots. Text stays selectable and searchable.
Quick answer: Add two or more PDFs, put them in the order you want with the arrow buttons or by dragging, click “Merge PDFs and download”, and save the combined file. Nothing is uploaded, text stays selectable, and there is no watermark.
How to Merge PDFs, Step by Step
- Add your PDFs. Click the upload area or drag files into it. You can add files in several rounds, and files that are not PDFs are skipped.
- Check the order. Each row is numbered. Use the up and down arrows to move a file, or drag rows on a computer. “Sort A to Z” and “Reverse order” save time with many files.
- Remove what you do not need. Use the red cross on a row, or “Clear all” to start again.
- Click “Merge PDFs and download”. Typical files take a few seconds. A progress bar shows which file is being processed.
- Save the result. The merged file downloads as
clearaitools-merged.pdf. A download button also appears in case your browser blocks the automatic download.
What Is Kept in the Merged PDF (and What Is Not)
The tool uses pdf-lib, an open-source library, to copy the pages of each file into a new document. It does not turn pages into pictures, so quality does not drop and text remains real text.
| Result | What it covers |
|---|---|
| Kept as in your originals | Text (still selectable and searchable), images, vector graphics, page sizes and orientation. |
| May not carry over | Bookmarks and outlines, interactive form fields, links between documents, and the title and author of the original files. |
| Not valid after merging | Digital signatures. Changing a signed PDF always invalidates its signature. |
Because pages are copied rather than re-rendered, the merged file is usually about as large as your files added together. If you need it smaller, run it through Compress PDF. If something important such as a fillable form or signature matters, open the merged file and check it before you send it.
Tips for a Clean Merged PDF
- Name files so they sort naturally. Names such as
01-cover.pdf,02-report.pdfand03-appendix.pdfwork well with “Sort A to Z”. - Remove unwanted pages first. Use Split PDF to extract only the pages you need, then merge.
- Turn images into PDFs first. This tool merges PDFs only. Convert JPG or PNG files with Image to PDF, then add them here.
- Mind the email limit. Many email services limit attachments to roughly 20 to 25 MB, so check the size of the merged file before sending.
- Merge in batches for very large jobs. Merge groups of files, then merge the results.
- Check the first and last pages of the result. It takes ten seconds and catches most ordering mistakes.
Common Problems and How to Fix Them
| Problem | Likely cause | What to do |
|---|---|---|
| Message says a file is password-protected | The PDF is encrypted. | Open it in a PDF viewer where you know the password, save an unprotected copy, and add that copy. |
| Message says a file could not be read | The PDF is damaged or incomplete. | Download or export the file again, or open and re-save it in a PDF viewer. |
| The page becomes slow or merging fails | Too many large files for your device’s memory. | Merge fewer files at a time and combine the results. |
| The pages are in the wrong order | The file list order is not what you intended. | Reorder the rows and merge again. |
| The merged file is too big | The source files are large. | Use Compress PDF on the merged file. |
| Download did not start | The browser blocked the automatic download. | Use the “Download merged PDF” button that appears after merging. |
Merging PDFs on a Phone or Tablet
The tool works in current mobile browsers. Dragging rows is awkward on a touchscreen, so use the up and down arrows to set the order. Phones have less memory than computers, so if a large merge fails, try fewer files at a time.
Other Ways to Merge PDFs
A browser tool is convenient, but it is not the best choice for every job:
- Preview on a Mac can combine PDFs. Open one PDF, show the page thumbnails in the sidebar, and drag the pages of another PDF into it.
- Desktop PDF editors usually have a “combine files” feature. They are better when you need to keep bookmarks, forms or signatures, or when you work with password-protected files.
- Command-line tools such as qpdf are useful for merging many files in a script. For example:
qpdf --empty --pages first.pdf second.pdf -- merged.pdfPrivacy: What Happens to Your Files
- Your PDFs are merged on your device. They are read by your browser and are not uploaded to our servers.
- A library is downloaded. The first time you add files or merge, the page loads the pdf-lib library from a public content delivery network.
- Ratings are sent to this site. If you rate the tool, only your star rating is submitted, never your files.
- Site cookies and ads. See our Privacy Policy for how the website handles analytics and advertising.
For extremely sensitive documents, a trusted offline program is still the most cautious option.
Limits to Know
- Up to 100 files per merge. This keeps your browser responsive.
- Everything is processed in memory. Very large files or many files at once may be slow or fail on devices with limited memory.
- Password-protected PDFs are not supported. Remove the password first.
- Whole files only. To merge only some pages, extract them with Split PDF first.
- No repair feature. A damaged file cannot be fixed by merging.
- Bookmarks, form fields and signatures may not survive, as explained above.
Frequently Asked Questions
Is this PDF merger free?
Yes. It is free to use, with no account, no sign-up and no watermark. You can merge up to 100 files at a time.
Are my PDF files uploaded to a server?
No. Merging happens in your browser. The page does load the pdf-lib library from a public CDN when you first use it, and a star rating is sent to this site if you choose to rate the tool, but your PDF files are never uploaded.
Will the merged PDF keep selectable text?
Yes. Pages are copied from your files, not converted to images, so text stays selectable and searchable, and image and vector quality is unchanged.
How many PDFs or pages can I merge?
Up to 100 files per merge. The practical limit is your device’s memory, so very large files may be slow. For big jobs, merge in batches.
Can I change the order of the files?
Yes. Use the up and down arrows on each row, drag rows on a computer, or use “Sort A to Z” and “Reverse order”.
Can I merge password-protected PDFs?
Not directly. Open the file in a PDF viewer where you know the password, save an unprotected copy, and add that copy.
Will bookmarks, form fields or signatures be kept?
They may not be. Digital signatures become invalid whenever a PDF is changed, and bookmarks and interactive form fields may not carry over. Check the merged file if they matter.
Can I merge images with PDFs?
Not in one step. Convert the images to PDF with Image to PDF, then merge the resulting files here.
Does it work on my phone?
Yes, in current mobile browsers. Use the arrow buttons to set the order, and merge fewer files at a time if your phone runs out of memory.
Does it work offline?
Not reliably. The page needs the internet to load the PDF library the first time you use it. For regular offline use, choose an offline PDF program.
What is the merged file called?
The download is named clearaitools-merged.pdf. You can rename it after saving.