Is there a file-size or count limit?

Around 30 files or 100 MB total works smoothly on most laptops. Files are processed on your device, so larger jobs may slow the browser briefly.

Are bookmarks and form fields preserved?

Bookmarks (outlines / table of contents) are preserved — leave "Combine bookmarks" on and each source becomes a top-level bookmark branch named after the file, with that file's own bookmarks nested beneath and pointing at the correct merged page. Page content, images, and embedded fonts are preserved exactly too. Form-field interactivity is not preserved — for fillable forms, use PDF Form Flatten on each source first, then merge.

Can I merge PDFs with different page sizes?

Yes — merge keeps each page at its original size. A4 and Letter pages can sit side-by-side in the same merged file; viewers render each page at its declared dimensions.

What happens if one of my PDFs is password-protected?

It is skipped from the merge and named in the result summary, while your other files still combine normally. Encryption can't be removed in the browser without re-rendering (which would lose selectable text and quality), so to include a locked file, remove its password with the Unlock PDF tool first — you'll need the password — then merge again. If every file you upload is locked, the merge stops with a message instead of producing an empty file.

Are my files uploaded anywhere?

No. Everything happens on your device — your PDFs are not sent to any server.

Is there a file-size or count limit?

Around 30 files or 100 MB total works smoothly on most laptops. Files are processed on your device, so larger jobs may slow the browser briefly.

Are bookmarks and form fields preserved?

Bookmarks (outlines / table of contents) are preserved — leave "Combine bookmarks" on and each source becomes a top-level bookmark branch named after the file, with that file's own bookmarks nested beneath and pointing at the correct merged page. Page content, images, and embedded fonts are preserved exactly too. Form-field interactivity is not preserved — for fillable forms, use PDF Form Flatten on each source first, then merge.

Can I merge PDFs with different page sizes?

Yes — merge keeps each page at its original size. A4 and Letter pages can sit side-by-side in the same merged file; viewers render each page at its declared dimensions.

What happens if one of my PDFs is password-protected?

It is skipped from the merge and named in the result summary, while your other files still combine normally. Encryption can't be removed in the browser without re-rendering (which would lose selectable text and quality), so to include a locked file, remove its password with the Unlock PDF tool first — you'll need the password — then merge again. If every file you upload is locked, the merge stops with a message instead of producing an empty file.

Are my files uploaded anywhere?

No. Everything happens on your device — your PDFs are not sent to any server.

Merge PDF

Combine multiple PDF files into a single document — preserving page order. You can also drop a ZIP of PDFs and we merge its contents.

Your files never leave your browser. All processing happens on your device — nothing is uploaded.

1. Upload your files (min 1)

Drop PDF files here

or click to browse (max 30)

Need at least 1 file (have 0).

How does the Merge PDF work?

Combine multiple PDF files into one document in seconds. Drop your PDFs into the upload area, use the up and down arrows to put them in the order you want, then click Merge. Your combined PDF downloads instantly. Useful for stitching together a contract and its addenda, combining scanned receipts into one expense report, or assembling pages from different sources into a single file. Page content (text, images, vectors) and embedded fonts are preserved exactly, and bookmarks are combined into a single outline (one branch per source file). Form fields lose their interactivity in the merged file — flatten them first using PDF Form Flatten if you need to keep the appearance. Password-protected PDFs can't be decrypted in the browser, so any locked files are skipped and listed in the result — the rest still merge normally. To include a locked file, remove its password with the Unlock PDF tool first (you'll need the password), then merge.

🔒 Security & Privacy

All processing happens on your device. Your files never leave your browser, never touch our servers, and are not stored anywhere. Close the tab and the file is gone.

📱 Use it on any device

Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.

⚡ Quick & easy

Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.

🎁 Always free, no signup

Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.

Frequently asked

For reordering within a single PDF, use Extract Pages or Split PDF. To reorder before merging, upload files in the order you want them combined, or use the up and down arrows on each file in the list.