Merge PDF

No. PDFTasker handles the merge in your browser after the page loads. The source PDFs are read from your device, combined locally, and exported back as a new file. That keeps the routine merge job out of a server upload queue and easier to reason about.

Yes. Set the file order before you run the merge, then review the result after download. Order matters more than most people think, especially for application packets, invoices, contracts, or scanned forms where a cover page and supporting documents need to appear in a predictable sequence.

Use it when you need one PDF from several local files and the documents do not need a cloud workflow. It fits resumes, statements, forms, IDs, invoices, and client packets where the task is simple but the file contents are still private enough to avoid upload-first tools.

Avoid it when your organization requires a specific document management system, audit trail, or server-side approval workflow. Very large PDFs can also run into browser memory limits. In those cases, the safer choice is the required enterprise system or a desktop PDF app with enough local resources.

You do. PDFTasker creates a new merged PDF in the browser and downloads it to your device. The original files stay where they were, and the output is yours to rename, review, compress, protect, sanitize, or send through the channel your recipient actually requested next.

There is no fixed limit built into the tool, but merging runs entirely in your browser, so the practical ceiling is your device's memory rather than a product tier. A few dozen normal documents merge without drama; very many large scans can slow an older laptop or phone. If the browser starts to labor, merge in smaller groups — chapters, sections, batches of ten — and then combine those intermediate files in a final pass. The result is identical, just easier on memory.

No. Merging copies each source page into the new file exactly as it is — text stays selectable, images keep their original resolution, and vector graphics are not re-rendered or recompressed. The output is the sum of the originals rather than a converted copy. That also means merging cannot repair quality problems that already exist in a source file: if one input is a blurry scan, it will be the same blurry scan inside the combined document.

Yes. A4, Letter, landscape, and portrait pages can coexist in one merged PDF, and each page keeps its own size and orientation — viewers and printers handle mixed layouts page by page. That said, a packet that jumps between portrait and landscape reads awkwardly on screen. If you want a uniform look, fix sideways pages with the rotate tool before merging; if a page-size mismatch matters for print, re-export that source document at the target size first.

Merge works at file level: it joins whole documents in the order you set. When the job is finer-grained — drop page 3, move the appendix forward, keep only a range — reach for the page-level tools instead. Organize lets you reorder and delete individual pages with thumbnails, and split exports just the range you need as a new file. Many real packets use both passes: trim each source with split or organize first, then merge the cleaned pieces.