Do files leave my device?

No. Merge runs entirely in your browser. Nothing is uploaded.

How many PDFs can I merge?

Up to 50 files and 200 total pages per merge — counted across all selected files together. Free and Premium use the same limit.

Yes. Merge runs in this browser. A longer walkthrough is on the Merge PDFs without uploading guide.

No. Output is clean, no branding added.

Tool details

local boundary

Formats: PDF
Limits: Up to 50 MB per file · 50 files
Processing: Processing stays in this browser after the page loads.
Result: Download or copy the result from this tab. Nothing is stored on ZANCTA.

Local processing

Processed in this tab. File bytes are not uploaded. How local processing works

Drop files here or click to browse

Max 50 files, 50 MB each.

Max 50MB/file, 50 files. Password-protected PDFs aren't currently supported.

Free, no upload — pass it on:

Before you start

Review the input, the visible limits, and the expected result before you choose a file. The workspace remains the primary place to do the task.

Check the input
PDF supported · up to 50 MB per file · up to 50 files.
Keep the boundary visible
Selected file bytes are processed in this browser for this supported local workflow.
Review the result
Wait until the tool finishes, inspect the output, then download or clear the workspace.

Do files leave my device?: No. Merge runs entirely in your browser. Nothing is uploaded.
How many PDFs can I merge?: Up to 50 files and 200 total pages per merge — counted across all selected files together. Free and Premium use the same limit.
Can I merge without uploading?: Yes. Merge runs in this browser. A longer walkthrough is on the Merge PDFs without uploading guide.
Is there a watermark?: No. Output is clean, no branding added.

Processing runs locally in your browser — no upload. Outputs are generated on-device. For the privacy boundary see the local processing guide.