Local PDF tool

100% In-Browser

PDF Merge

Combine multiple PDF files into one downloadable document for reports, invoices, contracts, scanned packets, class materials, and personal records. Add two or more PDFs, arrange them in the order you want, remove anything unnecessary, and download a single merged file. Processing runs in your browser, so the selected files are not intentionally uploaded by this tool.

Select two or more PDF files to combine them locally.

Merge order

Selected PDFs

0 files / 0 B

Your selected PDFs will appear here in the order they will be merged.

Guide

What Is a PDF Merge Tool?

A PDF Merge tool combines multiple PDF documents into one file. It is useful for business workflows, legal packets, education materials, reports, contracts, invoices, project documentation, personal records, and other situations where several documents need to travel together.

Merging and combining both mean placing documents into one PDF. Attaching documents can mean embedding files inside a PDF, which this page does not do. This tool copies pages from selected PDFs into a new merged document.

Method

How PDF Merge Works

Upload multiple PDFsSelect two or more PDF files from your device.
Read page countsThe page attempts to read each file's page count with pdf-lib.
Arrange orderUse Up, Down, Remove, and Clear to control the selected file list.
Copy pagesAll pages from each PDF are copied in the displayed order.
Create outputThe copied pages are assembled into one new PDF document.
Download merged.pdfThe final merged PDF downloads as merged.pdf.

PDF Support

Supported PDF Features

This page supports standard PDFs that pdf-lib can load and copy. It can combine single-page and multi-page PDFs, and copied pages can include text, embedded fonts, images, vector graphics, and scanned page content as represented in each source PDF. It does not provide visual previews, password entry, attachment embedding, bookmark controls, form controls, or metadata editing.

Corrupted, unsupported, or encrypted PDFs may fail to load even though the loader attempts to ignore encryption where possible.

Options

Merge Options

Multiple PDF uploadAdd multiple PDF files using the file picker.
Manual orderingMove files up or down before merging.
Remove fileRemove an individual PDF from the list.
Clear listReset all selected files.
Single merged outputCreate one combined PDF file.
No previewThis page lists files and page counts but does not render document previews.

Accuracy

Merge Accuracy

File orderThe merged PDF follows the visible order of selected files.
Page orderEach source PDF contributes pages in its original order.
Page contentThe tool copies pages rather than editing page contents.
Single outputAll copied pages are saved into one merged PDF.
Original filesSource PDFs remain unchanged.
Output nameThe downloaded file is named merged.pdf.

Examples

Common Examples

InvoicesCombine multiple invoice PDFs into one monthly packet.
PresentationsMerge separate slide deck exports into one document.
ContractsJoin scanned contract sections for client delivery.
eBook draftCombine chapter PDFs into one draft file.
Project reportsMerge status reports before sharing with a team.

Features

Implemented Features

Multiple PDF uploadsSelect more than one PDF file.
Document reorderingUse Up and Down buttons to arrange the merge order.
File removalRemove individual PDFs before merging.
Page count displayShow known page counts for readable PDFs.
Browser-based mergeProcessing runs in the browser with pdf-lib.
Single merged outputDownload one merged PDF file.

Use

How to Use PDF Merge

  1. Choose two or more PDF files.
  2. Review the selected file list and page counts where available.
  3. Use Up, Down, Remove, or Clear to arrange the desired merge order.
  4. Click Download Merged PDF.
  5. Open the downloaded merged.pdf and verify document order and completeness.

Output

Understanding the Output

Merged PDFOne output file is created from all selected PDFs.
Combined page orderPages appear file by file, following the displayed list.
File sizeThe selected list shows total source size; final size may differ after saving.
Download optionThe primary action downloads merged.pdf.
No visual previewThe page does not render the merged document before download.
Minimum filesAt least two PDFs are required before merging.

Applications

Common Use Cases

Business reportsCombine summaries, appendices, and supporting PDFs.
Contracts and legal documentsAssemble agreements, exhibits, and signature pages.
EducationJoin readings, worksheets, and assignment materials.
Invoices and receiptsCreate one file for accounting or reimbursement.
PrintingPrepare one PDF packet instead of many separate files.
Personal archivesOrganize related records into a single document.

Practical Notes

Benefits, Limitations, Tips and Mistakes

Benefits

  • Merge PDFs in the browser without installing desktop software.
  • Organize related documents into a single shareable file.
  • Preserve page content by copying pages instead of rasterizing them.
  • Reorder and remove files before creating the merged output.

Limitations

  • Only PDFs that pdf-lib can load and copy are supported.
  • Password entry, visual preview, page-level rearranging, and ZIP output are not implemented.
  • Very large PDF collections may require more processing time and browser memory.
  • Merge order affects the final document.

Tips for Best Results

  • Arrange files in the correct order before merging.
  • Keep original PDFs as backups.
  • Use a PDF Split tool first if you need to remove unnecessary pages.
  • Open and verify merged.pdf before sharing, printing, or filing it.

Common Mistakes

  • Uploading files in the wrong order.
  • Forgetting to rearrange documents before merging.
  • Expecting text or page editing instead of document merging.
  • Not reviewing the merged document after download.

FAQ

Frequently Asked Questions

What is a PDF Merge tool?

A PDF Merge tool combines pages from multiple PDF files into one output PDF.

How does this PDF Merge tool work?

It loads selected PDFs in the browser with pdf-lib, copies all pages from each file in the displayed order, saves one merged PDF, and downloads it.

Can I merge multiple PDF files?

Yes. Select two or more PDFs, arrange them, and download one merged PDF.

Does merging affect document quality?

The implementation copies PDF pages rather than rasterizing them, so it does not intentionally reduce visual quality.

Can I rearrange files before merging?

Yes. Use the Up and Down buttons to change document order before merging.

Can I remove a PDF before merging?

Yes. Use Remove on a selected PDF, or Clear to reset the full selection.

Can I merge scanned PDFs?

Yes, if pdf-lib can load the files. Scanned PDFs are still PDF documents with pages that can be copied.

Can I merge password-protected PDFs?

The loader uses encryption-ignore behavior where possible, but there is no password entry flow. Some protected PDFs may fail.

Is my PDF uploaded to a server?

The merge runs locally in your browser. The selected files are not intentionally uploaded by this tool.

Does it work on mobile devices?

It uses browser file inputs and downloads, so support depends on the mobile browser and available memory.

Is it free?

Yes. This is a free browser-based PDF merger.

What happens to bookmarks or metadata?

This page copies pages into a new PDF and does not expose controls for preserving or editing document metadata, outlines, bookmarks, or forms.

Can I merge very large PDF files?

Large files may work, but processing time and memory use depend on your browser, device, file count, and PDF complexity.

Why is my merged file larger than expected?

A new PDF can have different object structure and overhead, and merging keeps page resources needed by the selected files.

Can I merge PDFs created by different applications?

Usually yes, as long as pdf-lib can load the files and copy their pages.

Is the page order preserved?

Yes. The merged output follows the visible file order, and each source PDF contributes its pages in original order.

More Tools

Related Tools

Glossary

PDF Merge Terms

PDF
Portable Document Format, a fixed-layout document format.
Merge
Combining multiple PDFs into one PDF file.
Combine
Another common word for merging documents into one file.
Document Order
The order of source PDFs in the merge list.
Page Order
The sequence of pages inside the final merged PDF.
Metadata
Information stored about a document, such as title, creator, or dates.
Embedded Fonts
Font data included in a PDF so text can display as intended.
Vector Graphics
Shapes described mathematically rather than as fixed pixels.
PDF Object
An internal building block used by a PDF file.
Document Structure
The internal organization of pages, objects, resources, and references.

Sources

References

Transparency & Verification

Educational Disclaimer

100% In-Browser Execution

This PDF Merge tool combines multiple PDF documents using the implemented browser-based merge logic. Results are intended for educational, informational, and general productivity use. Merging preserves document content as supported by the implementation and follows the selected file order. Verify document order, page order, file completeness, document properties, and compatibility before sharing, publishing, printing, filing, archiving, or using generated PDFs in production workflows.

Calculations and transformations execute locally on your machine with full offline support. Always verify critical results.

View full legal disclaimer