Convert a PDF from A4 to US Letter

FreeNo uploadNo signupWorks offline

A4 is 210 × 297 mm and US Letter is 215.9 × 279.4 mm, so a document written for one does not fit the other exactly. Each page is placed on a US Letter page and scaled to 94.1 % of its original size, which is as large as it can be without cropping. The text stays vector, so it is still sharp and selectable, and the file never leaves your device.

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How to use A4 to US Letter PDF

A4 to US Letter PDF – Resize a A4 PDF to US Letter (215.9 × 279.4 mm), keeping the text sharp. Free, no upload.

Choose the A4 PDF.
Leave the target on US Letter, or change the scaling if you want the page filled rather than fitted.
Click Resize pages and download.

Supported formats

Input: PDF
Output: PDF

What changes between A4 and US Letter

US Letter is 5.9 mm wider and 17.6 mm shorter than A4. Fitting keeps the proportions, so the height runs out first and decides the scale – 94.1 % – while the other dimension gains a margin. Nothing is cropped and nothing is re-flowed.

The two sizes, as their standards define them
Size	Millimetres	Inches	Used in
A4	210 × 297 mm	8.27 × 11.69 in	the ISO 216 size used by every country except the United States, Canada and a few others
US Letter	215.9 × 279.4 mm	8.5 × 11 in	the ANSI size used in the United States, Canada, Mexico and the Philippines

Your page breaks stay where they are

This resizes pages; it does not re-flow the document. A paragraph that started at the top of page 4 still starts at the top of page 4, and a table that fitted on one page still fits. That is usually what you want when a portal or a printer rejects the paper size but the document itself is finished – and it is the difference between this and re-exporting from Word, which would re-flow everything.

Why the two directions are not the same

A4 to US Letter scales to 94.1 %, but US Letter back to A4 scales to 97.3 %. The two sizes differ by 5.9 mm across and 17.6 mm down, and fitting is decided by whichever gap is proportionally larger. Converting one way and then back does not return the original size – it scales twice, so set the size once from the original file where you can.

Limitations

Links and form fields on resized pages are not interactive in the copy.
Pages are scaled, not re-flowed: line and page breaks stay exactly where the original put them.
Scaling twice (there and back) compounds, so the result is smaller than the original.

Privacy

Files you choose are read into your browser’s memory and processed on your device; they are not uploaded to a server. Temporary download links are released after use, and the offline cache never stores your documents. More about privacy and limits.

Frequently asked questions

What size is US Letter?

215.9 × 279.4 mm, or 8.5 × 11 in. A4 is 210 × 297 mm (8.27 × 11.69 in).

Will the text get blurry?

No. The page content is placed as a vector form and scaled, not rasterised, so text stays sharp at any zoom and remains selectable and searchable.

Will my margins change?

Yes, visually. Everything on the page is scaled by the same 94.1 %, so the printed margins scale with it, and the left and right gain extra white space because that dimension is not the limiting one.

Is my file uploaded?

No. The PDF is opened and rewritten in your browser; nothing is sent anywhere.

Is it free?

Yes – free, with no signup, no watermark and no page limit.