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Resize PDF Pages Online

Change PDF page size to A4, Letter, Legal, or any custom dimensions.

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Resize one PDF at a time

How to Resize a PDF with IronFreeTools

  1. Upload PDF

    Choose one PDF file from your device or drag and drop it into the upload area.

  2. Pick a New Size

    Select a standard preset like A4 or US Letter, or enter custom width and height.

  3. Download Resized PDF

    Your resized PDF is ready.
    Download the new document to your device.

Resize PDF

Go Beyond one-off PDF Resizing with IronPDF for C#/.NET

Set custom page sizes in inches, millimeters or centimeters, and extend or reduce the sides of existing pages, in your C# and .NET applications with IronPDF.

Need to resize PDFs inside your own app? IronPDF lets you control page dimensions programmatically in C#/.NET as part of your automated document workflows.

Read the guide

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Frequently Asked Questions

Everything you need to know about resizing PDF pages

What does Resize PDF do?

Resize PDF changes the page dimensions of every page in your document. Pick a standard paper size such as A4 or US Letter, or set custom width and height values, and the tool rebuilds the PDF at the new size.

Will the content be scaled to fit the new page size?

Yes. By default the tool scales each page to fit the new dimensions while preserving the aspect ratio. You can switch to Stretch to fill the page exactly or Center to keep the content at its original size.

What units can I use for custom sizes?

Custom width and height can be entered in PDF points, inches, or millimeters. 72 points equals 1 inch and 1 inch equals 25.4 millimeters.

Does resizing reduce PDF quality?

No. The tool keeps the original PDF content as vector and text data. Only the page dimensions and content scale change, so text stays sharp and images keep their original resolution.

Are my files uploaded to a server?

No. Resizing runs locally in your browser using pdf-lib, so your PDF never leaves your device.

Can I resize a password-protected PDF?

Encrypted or password-protected PDFs need to be unlocked before resizing.

Can I change the orientation while resizing?

Yes. Pick Portrait or Landscape to force the new orientation, or keep the original orientation of each page.

Do I need an account?

No. Resize PDF is free to use without sign-up, login, or installation.

Is this tool completely free?

Yes. You can resize PDFs for free with no watermarks or hidden restrictions.

What are the key benefits?

Change PDF page size in one click Use common presets like A4, A3, Letter, or Legal Set custom width and height in points, inches, or millimeters Keep aspect ratio, stretch, or center the content Process files in your browser No account, no watermark, no upload.