Merge PDF Files Online Free

Combine multiple PDF files into a single document. Drag, drop, reorder — everything happens in your browser. Your files never touch our servers.

Drop your PDF files here or browse from your device · PDF only Select PDF files

No files selected yet. Add at least 2 PDFs to merge.

How to merge PDFs in your browser

Drop your PDFs into the upload area above — or click "Select PDF files" to pick them from your device. You can add as many as you need.
Reorder the files using the up and down arrows. The final merged document will follow this order.
Click "Merge PDFs" and download the combined file. Processing happens locally in your browser using pdf-lib. Nothing is uploaded anywhere.

Common use cases

Job applications — combine a resume, cover letter, and portfolio into one PDF that fits an upload form.
University and scholarship submissions — merge recommendation letters, transcripts, and a statement of purpose into a single attachment.
Government and immigration forms — bundle supporting documents (ID scans, certificates, evidence) into a single PDF for USCIS, IRS, or similar portals.
Legal filings — combine exhibits and pleadings into one court-ready file with consistent page order.
Receipts and expense reports — gather scanned receipts and an itemized summary into one PDF for accounting submission.
Ebook and notes consolidation — merge chapter PDFs or lecture handouts into a single readable document.

Privacy & Security

Your PDF stays in your browser. We never upload, store, or analyze your files. Processing happens locally using JavaScript (pdf-lib), and the merged file is generated entirely on your device. You can verify this yourself: open your browser's DevTools, switch to the Network tab, and watch — no file data leaves your computer during the merge.

This matters when you handle bank statements, medical records, contracts, passports, or any document with personal information. With server-based PDF tools (including our competitors), your file gets uploaded, sits on a third-party server during processing, and is "deleted later" — you have to trust their policy. With PDF2atom, there is nothing to trust and nothing to leak.

We do not modify the original file metadata or add a "merged by" tag. The output PDF carries no trace of our tool. This is intentional — important for legal, medical, and government submissions where document authenticity matters.

Tips for best results

Keep individual files under 50 MB for the fastest merge. Larger files work but use more browser memory.
For encrypted PDFs, our tool tries to read them anyway with ignoreEncryption. If the PDF refuses, decrypt it first using a tool you trust, then merge.
Mixed page sizes (A4 + Letter + Legal) are preserved as-is. Use our other PDF tools if you need to normalize sizes first.
Need to extract specific pages first? Combine our split-pdf and merge-pdf tools to build any custom document order.

Related tools

Frequently asked questions

Will my PDF be uploaded to your server?

No. All merging happens inside your browser using pdf-lib in JavaScript. Your files never touch our servers. You can verify this in your browser's DevTools Network tab — no file data is transmitted during the merge.

What is the maximum file size or number of files?

There is no hard limit, but browser memory is the practical ceiling. We recommend keeping the combined size under 200 MB and individual files under 50 MB for the smoothest experience. For very large jobs, merge in batches.

Does it work with encrypted or password-protected PDFs?

We try to read encrypted PDFs with the ignoreEncryption option, which works for many "view-only" protected PDFs. For fully password-locked files, decrypt them first using a tool where you provide the password — we do not offer unauthorized decryption.

Can I reorder the pages, not just the files?

This tool reorders entire files in the order you set. To rearrange pages across files, first use our Split PDF tool to break files into pages, then merge them back in your preferred order.

Does the merged PDF contain a watermark or our branding?

No. We add nothing to the output — no watermark, no metadata changes, no "merged by PDF2atom" tag. The file is yours, exactly as the source pages were.

Why is my file showing a "large" warning?

Files over 100 MB are flagged because they may cause your browser to slow down or run out of memory during processing. The merge will still attempt, but consider splitting the work into smaller batches if it fails.

Does this work on mobile?

Yes. PDF2atom runs in any modern mobile browser. On phones, tap the upload area to pick files from your phone storage or cloud apps. Large merges may be slower on mobile due to limited memory.