InfyTool
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Merge PDF files

Several PDFs into one, in the order you choose — merged on your own device, because contracts and statements do not belong on someone else’s server.

Two or more PDF files · merged in this order · nothing is uploaded

No size limit · files are processed on your device and never uploaded · how it works

Runs in your browser. Files are never uploaded — you can go offline after the page loads.

How to use the Merge PDF

  1. Drop two or more PDF files.
  2. Arrange them with the ↑↓ buttons — list order is merge order.
  3. Click Merge and download the combined PDF.

Easy to use

Drop files, pick options, download. Whole folders at once, no signup, no daily limit.

Best quality

The same engines the professionals use — SVGO, resvg, MozJPEG, libwebp, libavif — compiled to run in your browser.

Private & secure

Files are processed on your device and never uploaded. Close the tab and nothing remains anywhere.

Why merge PDFs in the browser?

PDFs are the most sensitive files people routinely feed to online tools: contracts, bank statements, medical reports, IDs. Every "free PDF merger" that uploads your files is asking you to trust a stranger's server with them. This one cannot see your files at all — the merge runs inside your browser with the open-source pdf-lib library, and works even offline once the page is loaded.

What merging keeps

Pages are copied into the combined document exactly as they are: selectable text stays selectable, images keep their original bytes, page sizes and orientations are preserved per page. Nothing is rasterised or recompressed, so the merged file is essentially the sum of its parts. Bookmarks and form fields are the exception — like most mergers, page content is what is carried over.

Related jobs

Need the opposite — pulling a few pages out of one file? Use the Split PDF tool. Building a PDF from photos or scans instead of existing PDFs? That is Image to PDF. And if the merged file is too big for an upload form, compress the source images before building with the image compressor.

Frequently asked questions

Is it safe to merge confidential PDFs here?

Yes — that is the point of this tool. The merge happens entirely in your browser with the open-source pdf-lib library; the files are never transmitted anywhere. You can load the page, go offline, and merge.

Will the merged PDF lose quality?

No. Pages are copied into the new document as-is — text stays text, images keep their exact bytes. Nothing is re-rendered or recompressed.

Is there a size or page limit?

No fixed limit. Hundreds of pages merge in seconds; the practical ceiling is your device’s memory for very large files.

Can I choose the order of the files?

Yes — the list order is the merge order; use the ↑↓ buttons to arrange the files before merging.

Split PDFPull exactly the pages you need Image to PDFAny images in, one PDF out Image CompressorSmaller files, same look

Your files never leave your device

Most online converters upload your file to a server. InfyTool ships the actual encoders to your browser as WebAssembly instead, so processing happens inside your tab — faster for batches, and nothing to delete afterwards.

  • No upload, ever. Turn off Wi-Fi after the page loads and every tool keeps working.
  • No limits. No file-size cap, no queue, no watermark, no account.
  • Runs on your CPU. Batches use several cores in parallel; nothing is throttled.

More free tools

Need icons or SVGs to start from?

InfyTool is built by the same team as these free libraries.

InfyIconFree SVG and PNG icons you can open directly in these tools. InfySVGFree SVG designs and illustrations, ready to optimise or convert. InfyPNGFree transparent PNG graphics for mockups and social posts.