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ToolNimbly

Merge PDF Files

Join up to ten PDFs in any order, with pages copied rather than re-rendered — so text stays text.

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What this tool does

Add between two and ten PDFs, arrange them in the order you want and download one combined document. Pages are copied across rather than rasterised, which means selectable text stays selectable, page dimensions stay exact and rotated pages stay rotated. Reordering works by dragging or by keyboard. The whole operation runs in your browser, so contracts, statements and reports are never uploaded anywhere.

How to use this tool

  1. Step 1: Add your PDFs

    Between two and ten files, up to 100 MB each. Each one shows its filename, size and page count once it loads.

  2. Step 2: Put them in order

    Drag the files into sequence or move the focused item with the keyboard. The list order is the page order in the output.

  3. Step 3: Remove anything you do not need

    Removing one file leaves the rest of the queue intact. If one file fails validation, it is identified by name and the others are unaffected.

  4. Step 4: Merge and download

    The combined document is assembled locally and downloads with a total page count you can verify.

Worked example

Assembling a mortgage application pack

Four documents that must arrive as one file, in a specified order.

Cover letter
1 page, A4
Three months of statements
9 pages, A4
Payslips
3 pages, US Letter
Signed declaration
2 pages, A4, one page rotated
Merged result
15 pages, each keeping its original size and rotation

Mixed page sizes are preserved rather than being forced onto a common size. The Letter-sized payslips stay Letter-sized, and the rotated page stays rotated.

How merging works

Each source document is parsed and its pages are copied — content streams, fonts and resources intact — into a new document in the order you set. Nothing is rendered to an image at any point.

  • Because pages are copied rather than redrawn, text remains selectable and searchable and vector graphics stay sharp at any zoom.
  • Page dimensions and rotation are carried across individually, so a document mixing A4 and Letter pages merges correctly.
  • Output metadata is minimal and deliberately excludes local file paths, so the merged document does not leak your folder structure.
  • The finished document is re-parsed before download to confirm the page count and that it opens cleanly.

Sources and methodology

ToolNimbly performs this work locally in your browser using the method shown above. Read how ToolNimbly tests calculations and generated documents.

What merging preserves and what it can change

A page-copy merger keeps each page’s dimensions, rotation, text and vector content rather than taking screenshots. That is why mixed A4, Letter and landscape pages can coexist in the result. Shared fonts and images may be copied into the new container, so the final size is not always exactly the sum of the inputs and may sometimes be slightly larger.

Document-level features need more caution. Bookmarks, forms, attachments, metadata, page labels and digital signatures do not behave like ordinary page content and may not survive or remain valid after assembly. A signed source cannot stay cryptographically signed once placed in a new file. Confirm the order, open the downloaded PDF and test important links or forms. Keep the originals whenever the source documents have legal, archival or accessibility requirements.

Limitations and privacy

What this tool does not do

  • Between two and ten PDFs per merge, each up to 100 MB. For a larger set, merge in stages.
  • Password-protected PDFs are refused. Remove the password in an authorised PDF editor first.
  • Bookmarks, form field values, digital signatures and some annotations may not survive the copy. A digital signature is invalidated by any modification, by design.
  • Pages are merged whole. Interleaving or selecting individual pages is a job for the splitter first, then the merger.
  • A corrupted file is identified by name and skipped rather than failing the whole batch.

PDFs commonly contain bank statements, contracts and identity documents. None of these files are uploaded — parsing and assembly happen in this browser tab, and everything is released from memory when you reset.

Frequently asked questions

Will merging change the quality of my pages?

No. Pages are copied rather than re-rendered, so text stays text, vector graphics stay vector and images are untouched. A merged page is byte-for-byte equivalent in content to the page it came from.

What happens when the PDFs have different page sizes?

Each page keeps its own dimensions. A merged document can contain A4 and US Letter pages side by side, which is the correct behaviour — forcing everything to one size would scale or crop content.

Can I merge a password-protected PDF?

No. Encrypted files are detected and refused. Remove the password in a PDF editor you are authorised to use, then merge the unprotected file.

Do bookmarks and form fields survive?

Page content always does. Bookmarks, form field values and some annotation types may not be carried across, and any digital signature is invalidated by modification. Check the merged file if those matter for your document.

How large can the files be?

Up to 100 MB each and ten files per merge. Those limits keep memory use within what a phone or older laptop can handle, since the entire operation runs on your device.

Read more about this

Related tools

Other tools people use alongside the merge pdf files.

  • Split PDF Files

    Extract pages, split every page into its own file, cut a PDF into ranges or delete pages you do not need. Page sizes and rotation are preserved.

  • Image to PDF Converter

    Turn JPG, PNG and WebP images into a single PDF. Reorder pages, pick A4 or Letter, set margins and keep every aspect ratio intact.

  • PDF Compressor

    Make a PDF smaller in your browser. Optimise its structure without touching the pages, or rasterise them for a bigger saving, with the trade-offs spelled out.

  • PDF to JPG Converter

    Render any page of a PDF to a JPG image at your chosen resolution. Pick pages or ranges, preview thumbnails and download single files or a ZIP.

Part of PDF Tools. Last reviewed .