Merge PDF Online

Combine multiple PDF documents into a single file locally. Choose custom page ranges, reorder files, and merge locally in your browser without uploads.

Select multiple PDF files to combine

Drag & drop your PDF files here, or click to browse

Processed locally in your browser — your documents are never uploaded to our servers
🔒 Processes locally in your browser — no files, code, or text are uploaded to our server.

Secure Client-Side PDF Merging

The Merge PDF Online utility allows you to combine multiple PDF documents into a single cohesive file quickly and securely. Unlike traditional online PDF services that upload your private documents to external servers, this tool executes 100% locally in your browser.

By processing files in client-side memory using modern JavaScript libraries:

  • No data is uploaded to our servers: Your files never leave your device, ensuring maximum confidentiality for sensitive documents, contracts, invoices, and resumes.
  • Instant processing: Zero network latency from uploading or downloading large documents. Processing speeds are limited only by your computer or phone’s local processor.
  • Unrestricted usage: Merge as many files as needed without signing up, paying fees, or facing server-enforced file size limits.

Key Features & Custom Settings

This tool goes beyond a basic binder by offering granular control over the merging process:

  1. Flexible Page Range Selection: You can specify exactly which pages to extract and merge from each document. Leave the field blank to include all pages, or enter comma-separated numbers and ranges (e.g., 1, 2-4, 1, 3, 5-7).
  2. Easy Drag-and-Drop Sorting: Order your files precisely. Drag rows to swap their sequence, or use the quick “Move Up” and “Move Down” buttons on mobile screens.
  3. Decryption Support: If any uploaded PDF is encrypted, the system will prompt you for the password to decrypt the file locally and continue the merge.

How to Merge PDFs Step-by-Step

Merging your documents takes only a few seconds:

  1. Upload Files: Drag and drop your PDF documents into the upload box, or click to browse files from your local storage.
  2. Arrange the Sequence: Drag the file rows to place them in the desired order. The first file in the list will represent the beginning of the merged PDF.
  3. Configure Page Ranges (Optional): If you only need sections of a document, type the desired page range (e.g., 1-3, 5 to merge pages 1, 2, 3, and 5) in the page range box.
  4. Merge & Save: Click the Combine & Download button. The browser will process the buffers locally and prompt you to download the combined PDF file instantly.

Frequently Asked Questions (FAQ)

Are my PDF files safe when using this tool?

Yes. DwellixTools processes all operations locally in your browser. No files or document contents are uploaded to our servers or stored on any external databases.

How do I specify custom page ranges?

In the file list, each row has a page range input field. You can use standard formatting:

  • Enter 1 for page 1.
  • Enter 1-5 for pages 1 through 5.
  • Enter 1, 3, 5-7 for pages 1, 3, 5, 6, and 7.
  • Leave it blank or type All to include the entire document.

Does this tool support password-protected PDFs?

Yes. If an uploaded PDF is encrypted, a password field will appear in that row. Simply enter the password, and the file will be decrypted locally so its pages can be copied.

Is there a file size limit or file count limit?

There are no artificial limits. However, since all files are loaded into your device’s memory simultaneously, merging extremely large files (hundreds of megabytes) might slow down or crash low-powered mobile browsers due to device RAM limitations.