AlteredIdea: Just Another Thought
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PDF Merger

Combine multiple PDF files into one. Drag files to reorder them.

How it works

Upload 2 or more PDF files. Drag them to set the order. Click Merge to download the combined PDF.

All processing is done in your browser: no files are uploaded to any server.

A PDF merger is a tool that combines two or more PDF files into a single document, preserving the formatting, fonts, and images of each original file. Developers, students, and office workers use PDF mergers to consolidate reports, contracts, and scanned pages into one shareable file. AlteredIdea's PDF Merger runs entirely in your browser using WebAssembly: your files are never uploaded to any server.

How to merge PDFs online for free: no uploads required

AlteredIdea's PDF Merger lets you combine multiple PDF files into a single document entirely within your browser. Unlike cloud-based services such as Smallpdf or ILovePDF, your files are never sent to any server: all the heavy lifting is done locally using pdf-lib compiled to WebAssembly.

This browser-native approach means your documents stay private, there are no file-size restrictions imposed by a server, and the tool works offline once the page has loaded. Whether you are merging contracts, reports, scanned receipts, or presentation slides, the merged PDF preserves all fonts, images, and formatting exactly as they appear in the originals.

How to merge PDFs: step by step

  1. 1
    Open the PDF Merger
    Visit AlteredIdea PDF Merger in any modern browser. No account or installation needed.
  2. 2
    Upload your PDF files
    Click 'Drop PDF files here' or drag your PDFs onto the upload zone. You can add multiple files in one go.
  3. 3
    Arrange the order
    Drag file rows up or down to set the exact page order for the merged document.
  4. 4
    Click Merge
    Hit the Merge button. Processing happens instantly in your browser: no waiting for an upload.
  5. 5
    Download your merged PDF
    The combined PDF downloads automatically. Open it in any PDF viewer to verify the result.

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Frequently Asked Questions

How do I merge PDFs online for free?
Upload your PDF files to AlteredIdea's PDF Merger, drag them to set the order, then click Merge. Your combined PDF downloads instantly: no account or payment required.
Do my files get uploaded to a server?
No. AlteredIdea processes everything inside your browser using WebAssembly. Your files never leave your device.
How many PDFs can I merge at once?
There is no hard limit. You can merge as many PDFs as your browser's memory allows. Most users comfortably merge 10–20 files at once.
Can I reorder pages before merging?
Yes. After uploading, you can drag and drop the file rows to set the exact order in which pages will appear in the merged PDF.
Does merging reduce PDF quality?
No. AlteredIdea copies pages directly without re-encoding images or fonts, so the output is identical in quality to the originals.
How do I merge PDFs on a Mac?
Open AlteredIdea in any browser on your Mac, upload your PDFs, arrange them, and click Merge. No software installation is needed.
How do I merge PDFs on an iPhone or iPad?
Open Safari or Chrome on your iPhone, go to AlteredIdea PDF Merger, upload your files from Files or Photos, and download the merged result.
Is there a file size limit?
AlteredIdea imposes no file size limit. Very large files may be slower because your device's CPU and memory do the processing.
Can I merge password-protected PDFs?
Only if you have the password. Remove the password first using our PDF Password Lock tool, then merge.
What file format is the output?
The output is a standard PDF file compatible with all PDF viewers including Adobe Reader, Preview, and browser PDF viewers.

AlteredIdea vs alternatives

vs Smallpdf / ILovePDF: Those services upload your files to their servers. AlteredIdea processes everything in your browser: your files never leave your device.

vs Adobe Acrobat online: Adobe requires an account and has file size limits on the free tier. AlteredIdea is unlimited and account-free.

vs desktop software: No installation, no licence fees, no OS dependency. Works on any device with a browser.

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