Is PDFWix really free?

Yes. Every tool on PDFWix is free to use with no daily task limits and no watermarks added to your files. We may charge for high-volume API usage in the future, but the web tools stay free.

Do I need to create an account?

No. Every tool works without signing in. An optional free account just keeps a history of your conversions (filename and tool only — never your files) and unlocks the developer API.

Do you store my files?

Most tools (merge, split, rotate, watermark, edit, JPG↔PDF, etc.) run entirely in your browser — your file never reaches our server. The two tools that need server processing (Protect PDF, Unlock PDF) process your file in memory and never write it to disk.

What's the maximum file size?

Browser-side tools handle PDFs as large as your device's RAM allows — roughly 100 MB on a typical laptop, less on phones. Server-side tools (Protect, Unlock) accept files up to about 25 MB per request.

Do you add watermarks to my PDFs?

No. PDFWix never adds a watermark, footer, or branding to anything you create. The output is exactly what you asked for, nothing else.

Does PDFWix work on iPhone, Android, and Chromebook?

Yes. PDFWix is a web app — it runs in any modern browser on any device. There's nothing to install. You can also add it to your home screen on iOS or Android for a one-tap launcher.

How is PDFWix different from iLovePDF or Smallpdf?

Three differences: most PDFWix tools run inside your browser (your file never leaves the device), there are no daily task caps on the free tier, and we never put a watermark on your output. As of June 2026, PDFWix has 24 live tools across merge, split, compress, sign, redact, and convert with no daily task limit and no file upload for 22 of them.

Is PDFWix safe for confidential documents?

For browser-side tools, yes — your file is processed locally and never transmitted anywhere. For the two server-side tools (Protect, Unlock), files travel over HTTPS and are processed in memory only. We never read, scan, or train AI on your documents.

Can I use PDFWix for commercial work?

Yes. There's no license restriction on what you produce with PDFWix. Use it for client work, internal documents, contracts, anything. The developer API is available if you need to embed PDF processing into your own product.

What happens if a tool fails or I find a bug?

Email support@pdfwix.com or use the "Report an issue" link in the footer. We read every message and ship fixes quickly.

Which PDF tools run entirely in my browser?

Twenty-two of the 24 PDFWix tools run entirely in your browser using WebAssembly — your file never leaves your device. The two exceptions are Protect PDF and Unlock PDF, which require server processing but handle your file in memory only and never write it to disk.

Is there a file size limit?

Browser-based tools handle files up to the available RAM on your device — typically 500MB or more on modern computers. Server-side tools (Protect, Unlock) currently support files up to 100MB.

Does PDFWix work on iPhone and Android?

Yes. All 24 PDFWix tools are fully optimised for mobile browsers. No app install required — open pdfwix.com in Safari on iPhone or Chrome on Android and every tool works exactly the same as on desktop.

Home / Guides / Merge PDFs Different Page Sizes

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How to Merge PDFs With Mixed Page Sizes Free

Combine PDFs with A4, Letter, portrait and landscape pages — no normalisation needed. Every page keeps its original size. Free, browser-based, no signup.

5 min readUpdated todayNo upload

PPDFWix Team· Reviewed for accuracy

Files never uploaded Runs in your browser No signup No watermark

Merge PDF Free — Preserves Page Sizes

Live · in browser

PDFWix Merge PDF preserves each page at its original size and orientation when merging. A4 pages stay A4, US Letter pages stay Letter, landscape pages stay landscape. No normalisation or resizing is applied. Free, browser-based, no account needed.

What happens to page sizes when you merge PDFs?

When merging PDFs, some tools force all pages to a single standard size — usually A4 or US Letter. This causes pages that were originally a different size or orientation to be scaled, cropped or padded. PDFWix Merge PDF preserves every page at its original dimensions. An A4 portrait page stays A4 portrait. A US Letter landscape page stays US Letter landscape. A custom brochure size remains unchanged.

This matters most when merging documents from different sources: a contract in A4 mixed with an American annexure in US Letter, or a report in portrait orientation combined with a landscape spreadsheet appendix.

Common mixed page size merge scenarios

Legal documents: Main contract in A4 (international) combined with US-sourced annexures in Letter format. Academic submissions: A4 main document with landscape data tables or diagrams as separate PDFs. Property documentation: Property description pages in portrait combined with floor plan PDFs in landscape. Invoice packages: Invoice summary pages combined with supporting receipts of various sizes.

How to merge PDFs with mixed page sizes

Open PDFWix Merge PDF — no account, browser-based.
Upload all PDFs. PDFWix reads and preserves the page dimensions of each file.
Reorder files by dragging to set the correct page sequence.
Click Merge PDF. Each page in the output retains its original size and orientation.
Download and verify in your PDF viewer — all pages should appear at their intended dimensions.

If you want to normalise page sizes

Some submission portals require all pages to be the same size (A4 or Letter). If you need to normalise page sizes before merging, the current approach is to convert each page to the required size in the source application before exporting to PDF, then merge. PDFWix Merge PDF is designed to preserve sizes, not normalise them. For splitting merged PDFs back into individual pages, use PDFWix Split PDF. See also our merge and compress workflow guide.

Use the free PDFWix tool:

Merge PDF Free — Preserves Page Sizes →

Frequently asked questions

Will merging A4 and Letter PDFs cause any pages to be resized?

No, not with PDFWix Merge PDF. Each page is preserved at its original dimensions. A4 pages remain A4 (210×297mm) and US Letter pages remain Letter (216×279mm). When viewing the merged PDF, pages of different sizes will appear at their natural sizes — viewers like Adobe and Chrome handle mixed page sizes correctly.

Can I control the order of pages when merging PDFs with different sizes?

Yes. In PDFWix Merge PDF, after uploading all files you can reorder them by dragging the file thumbnails to set the page sequence before merging. The merged PDF will contain pages in exactly the order you specified.

What if the merged PDF with mixed page sizes looks wrong in my viewer?

Some older PDF viewers default to displaying all pages at the same zoom level regardless of page size, which can make differently-sized pages look inconsistent. The actual page dimensions in the PDF file are correct. Test in Chrome's built-in PDF viewer or Adobe Reader for accurate rendering of mixed page sizes.