OmniCastCONVERTER
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Universal workbench

Merge PDF files

Merge an ordered set of PDF files into one document locally, without uploading them.

Device-onlyNo uploads. Ever.
Pipelines, branches, presets, naming, and detailed controls
Display
Quick start
Help me choose the best output Suggested: PDF

Recommendations use the registered target format and tested fidelity classification. They never inspect or upload your content.

01Input
Drop files or a folder hereChoose PDF files files or a folder — batch input is welcome
or paste content
File input required
02Configure & run
PDF filesPDF
structural conversion · single or batch
Conversion preflightSize, memory, engine, execution, and fidelity before you start
Input
0 B
Estimated peak memory
96 MiB
On-demand download
No large engine download
Execution
Responsive local worker
Fidelity
No lossy step declared
What to provideDrop two or more PDF files in the order they should appear. You can remove and re-add files to adjust the order.What you’ll getProduces one merged PDF containing every source page in the selected file order.
Output naming & batch behavior
Exampleoutput.pdf
Pipeline 1 linear · 0 branches
Why use A → B → C?

A pipeline feeds each result directly into the next compatible converter. Use one when the destination needs an intermediate representation or when you want to inspect and normalize that middle format.

  • JSON → CSV → XLSX turns records into rows before building a workbook.
  • Markdown → HTML → DOCX resolves markup before creating a document.
  • SVG → PNG → PDF intentionally flattens vector artwork before placing it on a page.
Only type-compatible next steps are offered. Lossy steps are marked before you run them.
1Merge PDF filesstructural
Parallel output branchesEach branch receives the final linear result. Branches do not feed or depend on one another.

Add content above to start. Nothing leaves this browser.

Processing happens locally. Your file bytes are never sent anywhere.
About this conversion

How to convert PDF files to PDF

Before you start

Drop two or more PDF files in the order they should appear. You can remove and re-add files to adjust the order.

Accepted: .pdf · application/pdf
  1. Choose or drag one or more PDF files files onto the drop zone.
  2. Confirm the detected format. Mixed-format batches are flagged before conversion.
  3. Select “Convert on this device.” Produces one merged PDF containing every source page in the selected file order.

How this converter behaves

PDF routes either embed a decoded image on a page or rasterize PDF pages into individual images.

What happens to your data?

The conversion engine runs in this browser tab. OmniCastConverter has no upload API and never sends your content, file name, or converted result to a server.

Fidelity and limitations

This route is classified as structural. The converter preserves meaning and structure supported by both formats.

  • Bookmarks, document-level attachments, digital signatures, and interactive actions are not copied.