Resize PDF Pages to Any Size

What does "resizing a PDF" actually mean? 📐

Unlike an image, a PDF doesn't have one width and height — it has one per page. Every page in a PDF stores its own dimensions, called the MediaBox. When you "resize a PDF," you're either changing those MediaBox dimensions, or you're re-laying-out the content to fit a new size.

Those are very different operations, and that's why this tool offers four modes. Two of them render the content and re-place it on the new page (which changes the appearance but preserves visual fidelity). The other two change the page box only, leaving the content's actual coordinates untouched.

Which one you need depends on what you're trying to accomplish. Below is a plain breakdown of each mode.

The four placement modes 🎯

1. Fit — for changing page sizes cleanly

This is the recommended mode and the one you want for almost any "convert A4 to Letter" or "convert Letter to A4" job. The page is rendered at the chosen DPI, scaled down or up to fit inside the target size while keeping its aspect ratio, and centered on the target page.

If your original and target have different aspect ratios, the content is scaled to fit the tighter dimension. For A4 → Letter, content is scaled slightly down and centered, producing small margins on the left and right. For Letter → A4, similar. Nothing gets cut off and nothing gets distorted.

2. Stretch — to fill the entire page

Content is scaled up or down to fill both dimensions of the target page. If the original and target aspect ratios differ, the content is distorted — circles become ovals, squares become rectangles. This is occasionally what you want: filling a slide, matching a template's exact aspect, or working around a specific layout constraint.

3. Actual size, centered — for adding margins

Content is placed at its original size, centered on the target page. Nothing scales. If the target is larger than the source, you get a bordered, letterboxed look (with the extra space acting as margins). If the target is smaller than the source, content overflows and may be clipped.

Common uses: taking a small page (like a 6×9 book page) and placing it centered on a larger sheet for printing, or fitting a receipt on a Letter page without scaling.

4. Lossless (box only) — for keeping text selectable

This mode uses pdf-lib's native `page.setSize()` — it changes the page's MediaBox without rendering. Text stays selectable, images keep their full resolution, vectors stay vector. The file size barely changes.

The trade-off: content keeps its original coordinates in bottom-left-origin space. If the new page is bigger, whitespace appears at the top-right. If the new page is smaller, content at the top-right gets clipped. The Lossless mode is best when you're:

• Growing the page box to add print-safe margins at top and right
• Shrinking the box to crop whitespace from a scan
• Converting between same-aspect sizes (A4 ↔ A5, Letter ↔ Legal at same width)
• Meeting a "must be A4" requirement without caring about content position

Common resizing scenarios 📋

How to resize PDF pages — step by step 📋

1. Upload your PDF. Drop it onto the upload box or click to browse. The file stays on your device.
2. Choose a target size. A4 is the international default; Letter is the US standard. If your target isn't in the presets, pick "Custom" and enter dimensions in mm, inches, or points.
3. Pick orientation. Portrait for text documents, landscape for wide tables or slides.
4. Choose a placement mode. "Fit" is the right answer for 90% of cases. See the table above for the others.
5. Adjust margins if needed. The margin slider controls how far content stays from the target page edges. Useful for print-safe areas.
6. Adjust DPI. For most work, 200 DPI is the sweet spot between file size and quality. Use 300 for documents that will be printed.
7. Preview each page. Use Prev / Next to check the current page at the target size — the preview shows exactly what the output will look like.
8. Click "Download Resized PDF."

What's preserved (and what isn't) ⚠️

In Lossless mode

• ✅ Selectable text — every character remains real text
• ✅ Original image resolution — no re-encoding
• ✅ Vector graphics — logos, charts, and diagrams stay vector
• ✅ Hyperlinks and forms — stay interactive
• ⚠️ Content position — unchanged coordinates; may crop or leave whitespace
• ⚠️ Content scale — no scaling at all; a 12pt font stays 12pt

In Fit / Stretch / Actual size modes

• ✅ Visual appearance — content looks the same (or scaled)
• ✅ Rendering accuracy — every detail preserved at 200+ DPI
• ⚠️ Text selectability — the page becomes an image; text can't be selected or searched
• ⚠️ File size — rendered images add bytes; a text-only PDF will grow significantly
• ⚠️ Hyperlinks and forms — not preserved (they become part of the image)
• ⚠️ Print quality — depends on DPI; 300 DPI matches the source, 120 DPI looks soft when printed

Standard page sizes 📏

Why use a browser-based resizer? 🔒

Most online PDF resizers upload your file to their server. Your document sits on a machine you can't see while you tweak a slider. For a public brochure, that's fine. For a contract, a bank statement, or a company report, it's a privacy risk.

This tool works differently. Everything runs inside your browser. The PDF is opened directly from your device's storage, pages are rendered in memory, and the resized PDF is written back out. No upload, no server, nothing to leak.

• No server uploads — your PDF never leaves your device.
• No sign-up — no email, no account, no waiting.
• No page limits — the only constraint is your browser's memory.
• Works offline — after the page loads, turn off Wi-Fi and it still resizes.
• No watermarks of our own — the output is clean.
• Free forever — no ads inside the tool, no per-file fee.

Who uses a PDF page resizer? 👥

• Anyone printing for another region — converting A4 to Letter (or vice versa) for a printer that expects the other standard.
• Freelancers — matching a client's spec sheet for page dimensions.
• Legal teams — resizing exhibits to match the filing format.
• Designers — placing mockups on presentation-sized pages.
• Anyone submitting documents — meeting a portal's "must be A4" requirement.
• Bookbinding and printing — matching print signatures or adding bleed margins.

Common problems and how to fix them 🛠️

"The content looks blurry after resizing"

You're using a low DPI setting. Switch to 200 or 300 DPI. Above 300 is rarely useful — most source PDFs don't have enough detail to benefit. Below 150 will look soft even on screen.

"The file became huge"

Render modes embed a high-resolution image of every page. For a 100-page text PDF, that's a lot of pixels. Try dropping to 120 DPI for internal documents, or use Lossless mode if you don't need the content to scale.

"My text isn't selectable anymore"

That's expected in Fit, Stretch, and Actual size modes — pages become images. If selectable text matters, use Lossless mode. It doesn't scale content but keeps every character as real text.

"The content got cut off at the edges"

This happens in Lossless mode when the target page is smaller than the original. In Lossless mode, content keeps its original coordinates, so anything beyond the new box gets clipped. Switch to Fit mode if you need to keep everything visible.

"I only want to resize certain pages"

Use the page range setting. Pages outside the range are copied to the output with their original dimensions unchanged. This is how you can make a mixed-size PDF where only the odd pages are resized.

"I need A4 but with different margin sizes on each side"

The margin slider applies the same margin to all four sides. For different margins per side, use "Actual size" mode with a larger target and pick the margin that gets you closest. Or use a tool like our Add Text/Image tool to overlay content that shifts things around.

Resize vs Organize vs Compress — which do I need? 🤔

Tips for the best results 💡

• Preview on the last page too. Aspect ratio issues are most visible on pages with different content — check a few before downloading.
• Match aspect ratio when possible. A4 and Letter have very similar aspect ratios (1.414 vs 1.294), so Fit mode gives good results without much scaling.
• Use Fit for anything important. It preserves everything and gives a clean, professional result.
• Use Lossless when text matters. If the document will be searched, indexed, or copied from, stay in Lossless mode.
• 200 DPI is the sweet spot. It balances file size and quality for on-screen use and office printing. 300 DPI for professional print.
• Keep the original. Resizing changes the file. Always keep the source PDF in case you need to redo it with different settings.
• Mobile users: resizing works on phones and tablets, but rendering large PDFs at 300 DPI is slow. Use 150 DPI on mobile or switch to desktop for anything over 20 pages.

Is it safe to resize PDFs here? 🔐

Yes. Here's exactly what happens when you use this tool:

1. You pick a PDF from your computer.
2. Your browser reads it into memory locally.
3. Pages are rendered and scaled in the browser tab.
4. The resized PDF is written locally.
5. You download the result back to your computer.

At no point does the file leave your device. No data is sent to SkillsInsider's servers. No tracking cookies watch your resizing. You can prove it yourself: turn off Wi-Fi after the page loads, then resize a PDF. It still works perfectly.