Application packets
Put a cover letter, form, certificates, and supporting evidence into one submission in the exact order requested by the recipient.
Merge PDF files online
Combine several PDFs into a single file. Add your files, put them in order, and download the merged document.
🔒 Your browser processes the file on your device. Nothing is uploaded to a server.
Practical guide
Merge PDF files without handing them to a server
A useful merge needs the right file order, a result that opens without errors, and a process that protects private material. This tool copies the original pages of every PDF you list into one new document inside your browser, so you do not need to upload contracts, applications, invoices, or reports for processing.
- 2 files
- the minimum before the merge button becomes active. Nothing in the tool caps the number above that, so your device's memory is the only ceiling.Measured in this tool's code
- 595 × 842 pt
- A4 in PDF points, rounded to whole points, where one point is 1/72 inch. Merging keeps every page at its original size, so A4 and US Letter (612 × 792) sources stay different sizes in the result.ISO 32000-1 point unit; pdf-lib page sizes
- 25 MB
- the total attachment size a personal Gmail account can send. Check the size of merged.pdf before you attach it, and share a link instead when it is larger.Gmail Help
How to merge PDF files in 3 steps
- 1
Add your PDFs
Choose or drag in two or more PDF files. Each one is listed with a number, and anything you add later joins the end of the list, so you can work in batches.
- 2
Set the file order
Use the up and down arrows to move a document through the list, and the ✕ button to drop one you did not mean to add. Every page of the first file comes first, then every page of the second, and so on.
- 3
Merge and check
Click the merge button, which becomes active once at least two files are listed. Download merged.pdf, open it, and confirm the first page, the last page, and each join between source documents before sharing it.
Worked examples
| If you need to | Do this | You get |
|---|---|---|
| Rejoin a document your scanner saved as scan1.pdf, scan2.pdf and scan3.pdf | Add all three, check the list reads 1. scan1.pdf, 2. scan2.pdf, 3. scan3.pdf, then merge | merged.pdf with the pages back in the order of the paper original |
| Send a job application as one attachment | Add the cover letter, CV and certificates, then use the arrows until the list matches the order the employer asked for | One file that opens on the cover letter and ends with the certificates |
| Combine twelve monthly invoices for the tax year | Name them 01-january.pdf to 12-december.pdf, select the whole batch, and read down the numbered list before merging | A single chronological archive to name once and file once |
| Use only pages 1-2 of one PDF and page 5 of another | Extract each part in the Split PDF tool first by typing 1-2 and then 5 in Pages to extract, and merge the two extracts | A merged file holding just those three pages |
| Fix a list you have already built | Click ✕ on a row to remove that file, or add the missing PDF and move it up with the arrows | A corrected order without starting again, and no change to any source file |
When to merge PDF files
Expense and business records
Combine invoices, receipts, statements, or delivery notes into a single archive that is easier to name, file, and retrieve later.
Client deliverables
Join a report, appendices, diagrams, and terms into one polished hand-off instead of sending a confusing folder of attachments.
Scanned paperwork
Merge separate scans from a phone or office scanner when the scanner captured one physical document as several PDF files.
Tips to merge PDF files well
- Rename source files with a numeric prefix such as 01-cover and 02-report before you select them. A whole batch usually arrives in name order, which puts the list close to correct before you touch the arrows.
- Open each source PDF first and remove blank or duplicate pages before merging.
- Merge first and add page numbers afterwards, so the combined document is numbered as one file instead of restarting at every join.
- Keep an untouched copy of every source file until the recipient accepts the merged document.
- For a large result, check the file-size limit of the email service or upload portal before you send it.
Good to know
- Unlock password-protected PDFs and repair damaged files before the browser reads them.
- Whole files are merged, not selected pages. To take part of a document, extract those pages with the Split PDF tool and merge the extract.
- Merging changes the document structure and may invalidate cryptographic signatures. Merge first and add the certificate signature last.
- The tool uses your device's memory while it combines large files. If the browser struggles, merge smaller batches and then join those batches.
Questions about how to merge PDF files
▸How do I combine PDF files into one PDF?
Add two or more PDFs, arrange the list so it reads top to bottom in the order you want, and click the merge button. The pages of each file are copied in list order into a new document that downloads as merged.pdf.
▸Does merging reduce PDF quality?
The tool does not compress images. It copies pages from each source into a new PDF, so photographs and text retain their original quality.
▸Can I change the order before merging?
Yes. Move whole files up or down in the list with the arrow buttons, and remove one with ✕. The page order inside each individual source file is preserved.
▸Why is the merge button greyed out?
The button stays inactive until at least two files are in the list, because there is nothing to combine with a single document, and it also greys out while a merge is running. Add the second PDF and it becomes active. Files are not checked as they are added, so a damaged or password-protected PDF only reports an error after you click merge.
▸Do the merged pages keep their original page size?
Yes. Every page keeps the size and orientation it had in its source file, so a mixture of A4, US Letter, and landscape scans stays mixed in the result. Resize the pages in a PDF editor beforehand if the whole document has to be one size.
▸Are my documents uploaded?
No. Your browser reads and combines the selected files. It creates the finished PDF on your device for you to download.
▸Can I merge signed PDFs?
You can combine the pages, but rewriting a signed PDF can invalidate its certificate signature. For a formal signing workflow, merge all pages first and add the certificate signature afterward.