Resize PDF Online

What is the Resize PDF tool?

The ToolBajar Resize PDF Tool changes the physical dimensions of every page in a PDF document. Whether you need a scanned landscape document converted to A4 portrait, a US Letter contract reformatted for a European printer, or a small flyer scaled up to A3, this tool re-lays out each page onto your chosen size. Instead of rasterising the pages, it keeps the original content as vector objects, so text remains selectable and sharp at any zoom level.

Everything runs inside your browser using client-side JavaScript. Your documents never leave your device — there is no upload, no queue, and no server-side storage.

How to resize a PDF online

1. 1

   Add your PDF files

   Click Select PDF Files or drag and drop documents into the drop zone.

2. 2

   Choose the new page size

   Pick a preset such as A4 or Letter, or select Custom size and enter your own width and height in points, millimetres, centimetres, inches or pixels.

3. 3

   Pick a fitting mode

   Fit keeps the whole page visible, Fill covers the page and crops the overflow, and Stretch forces the exact dimensions.

4. 4

   Resize & download

   Click Resize PDF Files. The resized documents download automatically.

Why use this Resize PDF tool?

• Runs fully in your browser — no uploads, no accounts, no watermarks.
• Preserves vector text and line art, so quality is not lost.
• Handles rotated pages correctly, including 90° and 270° scans.
• Supports points, millimetres, centimetres, inches and pixels.
• Batch resize as many PDFs as you like, free of charge.
• Works on desktop, tablet and mobile without installing software.

Need to make the file smaller after resizing? Use our Compress PDF tool. Want to combine documents first? Try Merge PDF.

Who should use this tool?

Practical examples

The Complete Guide to PDF Page Sizing

Page size sounds trivial, but it quietly decides whether a document prints correctly, uploads to a portal, or looks professional when it lands in someone's inbox. This guide explains what PDF page sizes actually are, why they matter, and how to change them safely.

PDF page sizes are measured in points

Inside a PDF, every page has a MediaBox — a rectangle measured in points, where 1 point equals 1/72 of an inch. A4 is 595.28 × 841.89 pt, US Letter is 612 × 792 pt, and Legal is 612 × 1008 pt. When you "resize" a PDF, you are effectively replacing that rectangle with a new one and deciding how the original content should sit inside it.

Fit, Fill and Stretch explained

• Fit (contain): The page is scaled uniformly so that the entire original page fits inside the new size. Nothing is cut off, but white bands may appear on two sides.
• Fill (cover): The page is scaled uniformly until it covers the whole new size. The aspect ratio is preserved, but the overflowing edges are cropped.
• Stretch: The width and height are forced independently. This guarantees an exact fill but distorts circles and text if the aspect ratios differ.

Does resizing reduce quality?

With a vector-preserving resizer, no. The original page content is stored as a form XObject and then placed with a transformation matrix. Text remains text, vector graphics remain vectors, and embedded images keep their original pixel data. Only the physical page dimensions change. Compare this to a rasterising resizer, which re-renders each page into a bitmap and permanently destroys text selectability.

Handling rotated pages

Many scanned documents store their content sideways and rely on the page's /Rotate entry to display correctly. A good resizer reads that rotation value, treats the page as its displayed dimensions, and compensates when drawing — otherwise pages come out sideways after resizing.

Choosing the right size

• A4 — the international standard for business documents outside North America.
• US Letter — the standard for the United States, Canada and parts of Latin America.
• Legal — used for contracts and court filings in the US.
• A3 / Tabloid — for posters, plans and detailed spreadsheets.
• A5 — booklets, handbills and small manuals.

Margins matter

Adding a small margin before fitting the content prevents printers from clipping the edges of your document. Most office printers cannot print right to the paper edge, so a 20–36 pt (7–12 mm) margin is a sensible default when the original document has content close to its borders.

Privacy first

Uploading confidential contracts, medical records or identity documents to a random web server is risky. Browser-based tools eliminate that risk entirely: the file is read with the FileReader API, processed in JavaScript, and written back to your disk — all without a single network request.

Frequently Asked Questions