Merge two PDFs into one file

A cover letter and a CV, due before lunch

A recruiter portal accepts exactly one attachment, and your application is two files: John-Smith-cover-letter.pdf and John-Smith-CV.pdf, two pages plus three. Drop them into the tool and the CV lands on top, because an uppercase C sorts before a lowercase c. The letter must come first, so one click on an arrow fixes it before anything is merged.

1. Open Merge PDF and add both files with Choose PDFs, or drag them in together.
2. Read the File order list. If the file you want first sits second, move it with its Move up arrow. The output follows the list exactly.
3. Press Merge PDFs. The browser joins the pages, then reopens the new file and compares its page count and selectable text with both sources.
4. Read the proof line and press Download. The file arrives named after the first file with -merged added, so give it a clean name like Smith-application.pdf before uploading.

Five pages, one attachment, the letter on top. The same shape fits a signed signature page plus its contract, an invoice plus its receipt, or a form plus its supporting statement: two files that belong together, in an order you choose rather than one the file picker chose for you.

The thirty-second check before you press merge

Two files leave little room for error, but the errors that remain are all order and acceptance. Run down this list while the files sit in the tool, before the merge runs:

• The file you want first is first in the File order list, and you read the list rather than assuming it.
• Both files were accepted: a locked file is refused up front and never joins the list.
• The totals show 2 files and the page count you expect, so no duplicate slipped in.
• You know the download will be named after the first file with -merged added, and you will rename it after.
• Any notice beside a file name, such as fillable fields that may not stay editable, is one you have read and accepted.

Thirty seconds here replaces the whole loop of uploading, noticing the CV came first, and starting over. The merge itself is the fast part; the check is the work.

Two-file merges that come back wrong

The order came from the file picker. Alphabetical sorting decides nothing well: case differences, numbers without padding, and names like final-v2 all land somewhere surprising. Read the list every time and move files with the arrows. Order is the entire job here.

One file was locked. A password-protected PDF is refused before it joins the list, with a plain message saying so. Open it in Unlock PDF with the password you already know, save the unlocked copy, and merge that.

The portal wanted two uploads after all. Some recruiters and portals accept one file per field: letter in one box, CV in another. Merging first and then discovering two upload boxes wastes the round trip. Read the form before you merge.

A sideways page rode along. Each page keeps its orientation, so a landscape scan stays landscape in the merged file. Turn it afterwards with Rotate PDF, which can fix one page without touching the rest.

Bookmarks or fields did not survive. The merge copies pages, not document furniture: outlines, labels, attachments and interactive fields may not travel along. Each affected file carries a notice before you merge, so nothing about this is a surprise if you read the list.

When two files should stay two files

Merging is not always the kindest thing you can do to the recipient. If the recruiter forwards your CV to a hiring manager but keeps the letter, one file forces them to split what you joined; Split PDF undoes it, but two uploads would have been kinder. If each file goes to a different person, send them separately. If one file is still changing, wait: a merged file freezes the pair, and every edit means merging again.

Three files? Use the batch page rather than merging twice; one pass beats two rounds on every count. Pages that must interleave instead of stack belong in Organize pages after the merge. And a password nobody knows stops everything until the sender shares it or an unlocked copy.