Is Merge PDF free to use?

Yes. Merge PDF is free in your browser with no sign-up. Free plan supports files up to 50 MB with fair-use limits. AstraPDF Plus removes caps and ads.

How many PDFs can I merge at once?

Up to 20 files per merge on the free plan. Merge a batch, then merge the result with remaining files if you need more.

Will merging reduce quality?

No. Merging is non-destructive — it does not re-compress or re-render pages.

Can I merge password-protected PDFs?

Unlock them first with our Unlock PDF tool, then merge the unlocked files.

Can I use this on mobile?

Yes. Open the tool in Safari, Chrome, or Firefox on any smartphone or tablet — no app required.

Do I need a paid account?

No. Merge PDF works on the free plan. Plus is optional for unlimited processing and larger files.

Merge PDF Files Online Free — Combine PDFs Instantly

Q: Is it safe to use Merge PDF online?

Yes. AstraPDF processes files on your device. Your files are processed locally in your browser — nothing is uploaded to our servers. We cannot access your documents.

Choose PDF Files

or drop PDF files here

Select Files

PDF only · Up to 20 files · Processed in your browser

Combine PDFs in seconds

Upload multiple files, drag to reorder, and download one merged PDF. Works on every platform with no install.

Original quality preserved

Merge stitches documents at the PDF level — fonts, images, and layout stay exactly as in your originals.

Secure — files never uploaded

Your files are processed locally in your browser — nothing is uploaded to our servers.

How to merge PDF files online for free

Combine PDF documents in four steps — no account required.

1
Upload your PDFs
Drag and drop files or click to browse. Add up to 20 PDFs in one batch.
2
Arrange the order
Drag thumbnail cards to set the page sequence in your merged document.
3
Merge in your browser
Click Merge — files are combined locally on your device within seconds.
4
Download the result
Save your single merged PDF. Compress or protect it with our other tools if needed.

Everything you need to merge PDFs

Professional PDF combining without cloud uploads or watermarks.

Start immediately — no fuss

Use Merge PDF directly in your browser. No sign-up, no software install.

Works on any device

Desktop, tablet, or phone on Windows, Mac, Linux, iOS, and Android.

No watermarks on output

Download clean results on Free and Plus — no branding stamped on your files.

100% browser-based privacy

Your files are processed locally in your browser — nothing is uploaded to our servers.

Combine with other PDF tools

Chain tools together — merge, compress, convert, protect, and sign in one workflow.

Optional Premium upgrade

AstraPDF Plus removes file-size caps, fair-use limits, and ads — still 100% private in your browser.

When to merge PDF files

Combine separate documents into one polished file for sharing, submission, or archiving.

Business reports

Join cover pages, summaries, and appendices into one client-ready PDF.

Invoices & receipts

Bundle monthly expense PDFs for accounting or reimbursement.

After splitting

Recombine selected sections from a split document.

Before compressing

Merge first, then shrink the combined file.

Merge PDF FAQs

Common questions about merge pdf with AstraPDF.

Need more power?

Merge unlimited PDFs without limits

AstraPDF Plus removes file-size caps, fair-use limits, and ads — still 100% private in your browser.

Get Premium

Related PDF tools

Split PDF

Separate merged files into parts

Compress PDF

Reduce merged file size

Extract Pages

Pick pages before merging

Protect PDF

Password-protect the result

Need more power? See our pricing plans or browse all tools on the homepage.

Merge PDF Files Online — Free & Private