Starlight Tools

PDF Paper Size Converter – Resize Pages to A4, Letter or Legal

Change PDF page dimensions without uploading your document. Choose a standard or custom paper size, preview Fit or Fill, and download a new PDF.

1. Choose a PDF

Drop a PDF hereor choose one from your device

2. Choose the new page size

Applied equally on all four sides.

3. Choose how pages fit

4. Review and download

Paper size preview

Load a PDF to begin
Your resized page preview appears here

Choose a PDF or use the example, then select A4, Letter, Legal or a custom paper size.

The dashed line shows the selected safety margin. Fit mode shows the entire source page; Fill mode clips overflow at the paper edge.

Original page—
Output page—
Content scale—
Review interactive PDFs carefully. Resized pages are embedded as page artwork. Links, form fields, comments, layers and other annotations on resized pages may be flattened or omitted.

How to resize PDF pages to A4, Letter or Legal

1. ChooseSelect one PDF from your device or load the locally generated example.
2. SizePick A4, US Letter, US Legal, A3, A5 or enter custom dimensions.
3. FitKeep the whole page with Fit, or cover the sheet with Fill.
4. DownloadCheck the preview and save the resized PDF to your device.

Fit versus Fill

The converter scales proportionally, so circles stay circular and text is not stretched. Fit uses the smaller of the horizontal and vertical scale factors: scale = min(available width ÷ source width, available height ÷ source height). It keeps the complete source page and centres it, which can leave white space. Fill uses the larger factor: scale = max(...). It covers the available paper area but clips equal overflow from opposite edges.

Standard paper dimensions

PaperDimensionsCommon use
A4210 × 297 mmGeneral documents in most countries using ISO 216 paper
US Letter8.5 × 11 inGeneral office and home documents in the United States and Canada
US Legal8.5 × 14 inLong-form legal and administrative documents
A3297 × 420 mmPosters, diagrams and larger layouts
A5148 × 210 mmBooklets, handouts and compact documents

PDF coordinates use points. This tool converts with 72 points per inch and 25.4 millimetres per inch. ISO sizes use their published millimetre dimensions; small decimal point differences are normal.

What changes in the exported PDF

Each selected source page is placed proportionally onto a new page with the requested dimensions. Text and vector graphics are not intentionally rasterized. Pages outside a selected range are copied at their original size. The new document may have a different file size, and document-level navigation such as bookmarks is not guaranteed to survive.

Frequently asked questions

Does my PDF get uploaded?

No. The selected PDF is read and processed in browser memory. Normal page resources such as analytics and ads may still make network requests, subject to consent choices, but this tool does not include your PDF bytes in those requests.

What is the difference between Fit and Fill?

Fit scales the entire source page into the available area and may add whitespace. Fill covers the entire area but may crop content at two edges when the aspect ratios differ.

What are the exact A4, Letter and Legal dimensions?

A4 is 210 × 297 mm. US Letter is 8.5 × 11 inches. US Legal is 8.5 × 14 inches. Landscape orientation swaps width and height.

Will the resized PDF keep selectable text?

Usually yes. Pages are embedded as PDF content instead of intentionally converted to bitmap images, so ordinary text and vector artwork remain vector PDF content.

Can I resize only some pages?

Yes. Choose Page range and enter values such as 1-3, 6, 9-12. Pages outside the range are copied at their original size.

Does resizing preserve links, forms and comments?

Do not rely on it. Resized pages are embedded as page artwork, so interactive links, form fields, comments, layers and other annotations may be flattened or omitted. Pages outside a selected range are copied without resizing.

Can I use a custom PDF page size?

Yes. Choose Custom, select millimetres or inches, and enter the width and height. Each side must be from 25.4 to 2,000 mm, or the equivalent in inches.

Are password-protected PDFs supported?

No password is requested. If the browser libraries cannot open or modify an encrypted or permission-restricted PDF, use an authorized unlocked copy.

Is there a file-size limit?

The tool accepts one PDF up to 200 MB. The practical page-count limit depends on available browser memory and document complexity.

What should I check before printing the result?

Open the downloaded PDF and inspect every resized page, especially edges in Fill mode. In the print dialog, use Actual size or 100% if the printer should honor the new PDF dimensions.

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