Is there a limit on the number of files I can merge?

Up to 20 files per merge, at up to 100 MB each. The practical ceiling within that is your device's available memory — modern laptops handle a few hundred pages without trouble. For a bigger job, merge in batches and then merge the intermediate results.

Are bookmarks, hyperlinks, and form fields preserved?

Page content, fonts, and images are preserved exactly. Bookmarks (the document outline) are not carried over, because the outline lives outside the pages being copied — if you need bookmarks, add them after merging with the PDF Bookmarks tool. Interactive form fields can also lose their behavior for the same reason, so fill or flatten forms before merging.

Can I merge password-protected PDFs?

You'll need to unlock them first using the Unlock PDF tool, then run them through merge. Convertora does not bypass passwords — it requires you to know the password to unlock the document.

Does the merged file get larger than the inputs combined?

Expect it to be roughly the sum of the inputs, since each source document's fonts and images are copied into the output. If the result is too big to email, run it through the Compress PDF tool — that pass is lossless, so nothing visual changes.

Merge PDF

Combine multiple PDF files into one. Drag pages to reorder.

Drop PDF files here or browse

Max 100MB per file · Up to 20 files

About Merge PDF

Merging PDFs is one of the most common reasons people reach for a PDF tool. You probably have a contract scanned in three parts, a bank statement that arrived as separate monthly files, or a research bundle assembled from half a dozen sources. Convertora's merge tool stitches them all into a single document — pages stay sharp, text stays selectable, and embedded fonts and images are carried over exactly as they appear in the original files.

Unlike most online merge tools, Convertora does the entire job inside your browser. The PDFs are read into memory by a JavaScript library, page objects are copied between documents, and the result is rebuilt and handed back to you for download. There is no upload step, no queue, no cloud worker — which is why you can merge highly confidential documents (legal filings, medical records, payroll runs) without those files ever leaving your machine.

Merging here is also page-level, not just file-level. Every page of every file you add appears as a thumbnail, so you can interleave pages from different sources, drop a page that doesn't belong, or move an appendix to the front — all before the output is generated.

How to use it

1Drop two or more PDF files into the upload area, or click to pick them from your file system (up to 20 files, 100 MB each). Convertora renders every page as a thumbnail.
2Drag the thumbnails to reorder pages across files. You can interleave pages from different sources or pull a single page out of one PDF and slot it into another.
3Remove any thumbnail to drop that page from the final output if it does not belong.
4Press Merge. The pages are copied into a fresh document in the order shown and the download begins as soon as processing finishes — typically a few seconds for documents under 100 pages.
5The result downloads as merged.pdf. Your original files are never modified.

Common use cases

Combining scanned pages from a multi-feed scanner that produced one PDF per side of the page.
Assembling a closing binder from contracts, addenda, and signed signature pages.
Bundling academic papers, exhibits, or reference material into a single file for submission or archiving.
Producing a single 'all-in-one' PDF for clients or stakeholders so they don't have to download attachments separately.
Reattaching a corrected page to a report without regenerating the whole document.

Frequently asked questions

Tips

If a PDF you want to merge is locked, run it through the Unlock PDF tool first.
For a long stack of files, use a consistent file-name pattern (e.g. 01-cover.pdf, 02-intro.pdf) — pages appear in the order you add files, and named files make reordering quicker.
Use the Clear all button if the page order gets tangled — starting over is often faster than untangling fifty thumbnails.

100% private — runs in your browser

Convertora processes everything on your device using JavaScript and WebAssembly. Files never leave your browser, are never uploaded to a server, and are never seen by us or anyone else. The moment you close the tab, the data is gone — there is no temporary cloud copy, no log entry, no retained backup.

Because the work happens locally, processing speed depends on your device — but there are no rate limits, no daily caps, and no file size restrictions beyond what your browser can handle in memory. No signup, no account, no payment. The tool works the same in incognito mode, on a corporate network, or after the page has loaded once, even with the network disconnected.