100% Client-Side WASMZero Remote NetworkVerified Spec

Merge PDF

Interactive Studio

Combine multiple PDF documents into a single file with custom ordering, file metadata badges, and integrated PDF preview. Instant feedback with zero server storage.

Loading tool…

About Merge PDF

Toolium's Merge PDF Studio combines multiple PDF files into a single unified document entirely within your browser. Arrange files with drag-and-drop or reordering triggers, preview individual page counts, customize the output filename, and download your consolidated PDF with complete privacy.

How to use Merge PDF

  1. Add two or more PDF files.
  2. Drag to reorder them or use the reorder buttons.
  3. Set the output filename.
  4. Merge and download the combined document.

Worked examples

Input: A 3-page cover letter and a 10-page report

Result: A 13-page PDF with the letter first.

Background

Merging copies the pages of each file into one new document in the order shown. Page content is not re-rendered, so text stays selectable and quality is unchanged.

Bookmarks, form fields and links can behave differently after merging, because those depend on structures inside each original file. Check the merged file before sending it.

Common mistakes

  • Merging in the wrong order. Check the list before you merge.
  • Merging files with passwords, which must be removed first.
  • Assuming form fields from different files will not conflict.

Frequently Asked Questions

Are my PDF files uploaded to a server?
Never. Toolium uses WebAssembly and client-side pdf-lib to merge pages directly in your browser without sending any data to external servers.
Can I reorder the files before merging?
Yes, use the Up and Down buttons next to each document in the queue to arrange the exact page sequence.

Fast, local-first developer micro-tools with zero tracking or latency.

Browse All Tools
Local-First Architecture: Toolium parses payloads exclusively in browser memory. Zero network telemetry.
⌘C Copy⌘K Palette