Merge PDF

Combining several PDFs into one clean document is a daily task for many people, whether the files are scanned pages, chapter drafts, or a stack of invoices. This tool stitches as many PDFs as you like into a single file with the page order you choose. The merge happens entirely in your browser using pdf-lib, so your documents are never uploaded to a server. There is no account to sign up for and no watermark stamped across the finished pages.

One Document Instead of Many

Email inboxes and file folders fill up fast when one report arrives as six separate attachments. Merging gives you a single deliverable that is easy to forward, store, and print. Students combine scanned research pages into one submission. Accountants fold monthly statements into a year-end bundle. A job candidate can join a resume, a cover letter, and reference letters into one polished packet.

You are not stuck with the order the files happen to land in. The tool lists every selected file and lets you move each one up or down before merging, so the final page sequence matches exactly what you want rather than whatever order the picker returned. That small bit of control is what turns a pile of files into a document that reads the way you intended.

How to Merge PDFs

1. Click the upload area or drag and drop PDF files into it. You can add files one at a time on the free tier, or select several at once with Premium.
2. Review the file list, which shows each document's name and size, and reorder entries with the up and down controls until the sequence looks right.
3. Remove any file you added by mistake, or clear the whole list to start over.
4. Click the merge button, wait for the progress bar, and download the combined document, named merged.pdf.

The progress bar keeps you informed while pages are copied into the new file. For typical documents the process finishes in moments. If the result is not what you expected, a restore option redownloads the first source file so you can retry without hunting through your folders.

What Merging Preserves

• Page content, fonts, and layout are carried over unchanged from each source file.
• Links, images, and form fields survive the merge on each source page.
• All pages from the selected files appear in the output, in the order you arranged them.
• Nothing is compressed, downsampled, or otherwise altered during the process.
• The operation refuses files it cannot read, like corrupted or fully encrypted PDFs.
• The original files stay untouched on your device; you only download a new copy.

One caveat: pages keep their own dimensions, so a file that mixes letter and A4 pages will have mixed page sizes in the output. The merge combines the files as they are rather than normalizing them to a single size. That is usually the right behavior, since resizing could distort a layout you already finalized.

A Practical Example

Imagine a job application: a two-page resume, a one-page cover letter, and a three-page portfolio. Dropping them into the tool in that order and hitting merge produces a single six-page PDF that is ready to attach to one email. The same flow works for a 40-page course reader, a binder of receipts, or any other collection that should arrive as one file.

Privacy and Limits

Because merging runs locally, sensitive material like legal agreements and medical forms never leaves your computer. There is no upload step and no server that could store a copy of your work. What happens on the page stays on the page.

Free use covers files up to 10MB, which handles most scanned and typed PDFs, and a minimum of two files is required to merge. Premium subscribers can merge larger files up to 100MB, select multiple files at once, and process without the brief wait between runs. For everyday combinations, the free tier gets the job done.