Resize PDF
Change your PDF's page size to A4, Letter, Legal or any custom dimension, and choose how the content scales to fit. Free, fast and secure.
or drop a PDF here
Change every page to A4, Letter, Legal or any custom size — fit, stretch or center the content.
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Related tools
Need to change your PDF page size from A4 to Letter, or scale a document to fit a specific format? oMyPDF's Resize PDF tool lets you resize every page to any standard size — A4, Letter, A3, A5, Legal, and more — or set a custom width and height. Choose to scale the content to fit the new size or keep it at its original dimensions. Files under 15 MB are resized directly in your browser.
How to resize a PDF
- 1
Upload
Select a PDF, or drag and drop it into the workspace.
- 2
Choose a size
Pick a standard size like A4 or Letter, or enter custom dimensions, then set orientation and scaling.
- 3
Resize & download
Click Resize and download your PDF with the new page size.
Resize PDF features
Standard & custom sizes
A0–A6, B4/B5, Letter, Legal, Tabloid, photo sizes — or any custom width and height in mm, cm, in or pt.
Fit, stretch or center
Choose how content scales onto the new page — keep aspect ratio, fill the page, or keep the original size.
Private & instant
Smaller files are resized right in your browser; larger ones use secure server processing and are deleted right after.
Security & privacy
Your files stay private. PDFs under 15 MB are resized entirely in your browser — no upload required. Larger files are sent over an encrypted connection, resized immediately, and permanently deleted from our servers. We never store, read, or share your documents.
Frequently asked questions
Is the oMyPDF resize tool free?
Yes. Resizing PDF pages is 100% free with no watermark on the output and no sign-up required.
What's the difference between fit, stretch and center?
Fit scales the content to fit the new page while keeping its aspect ratio (adding whitespace if needed). Stretch fills the entire page and may distort content. Center keeps the content at its original size, centered on the new page.
Can I resize only some pages?
Yes. Enter page numbers or ranges like 1-3, 5, 8-10 in 'Pages to resize'. Listed pages are resized; the rest keep their original size. Leave it empty to resize every page.
What does 'Auto' orientation do?
Auto matches each page's original orientation — landscape pages stay landscape and portrait pages stay portrait — using the chosen size.
Are my files safe?
PDFs under 15 MB are resized entirely in your browser and never leave your device. Larger files are sent over an encrypted connection, processed immediately, and deleted right after.