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Resize Image

Change image dimensions with high-quality resizing

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Resize Image Online — Complete Guide

Change image dimensions for websites, social platforms, and print without desktop software. PdfPeaks Resize Image scales JPG, PNG, WebP, and related formats by exact pixel width/height or by percentage so you can hit CMS, marketplace, and email requirements in one pass. Unlike a generic "make it smaller" export, this page is built for deliberate sizing: lock common aspect ratios (16:9, 4:3, 1:1, stories), choose stretch/crop/pad modes when the source does not match the target box, and use quick presets (1080p, Instagram, Facebook) when you need a starting point instead of guessing pixels. Start from the highest-resolution original you have — upscaling a tiny thumbnail cannot invent detail, but downscaling a large photo for the web usually looks sharp. Need a Pakistan CNIC, NICOP, or passport photo? Crop to the official size here, then read the photo-size guide.

How It Works

Upload an image, enter target width and height (or pick a preset), keep or unlock aspect ratio, then apply. Preview original vs new dimensions before you download so you catch accidental crops or letterboxing. The resized file is ready for CMS upload, email, or embedding into a PDF workflow on PdfPeaks.

  • Step 1 — Upload: Select the image to resize (JPG, PNG, WebP, and similar).
  • Step 2 — Dimensions: Set pixels, percentage scale, aspect lock, and resize mode.
  • Step 3 — Download: Save the optimized dimensions and verify the preview.

Security & Privacy

Files are encrypted in transit and deleted after processing — see our Privacy Policy for details.

Common Use Cases

  • Web: Match hero banner and thumbnail specs without opening Photoshop.
  • Social: Fit Instagram, LinkedIn, and cover photo sizes.
  • E-commerce: Standardize product photo dimensions across a catalog.
  • Email: Reduce width so messages load fast on mobile.
  • Documents: Shrink oversized scans before Image to PDF or JPG to PDF.

Tips for Best Results

Upsizing small images may look blurry — start from the highest resolution source. Try Compress Image after resizing when portals enforce a byte limit. Read how to resize images for your website. Formats: JPG, PNG, WebP, and more.

Related guides

Browse all PDF & image guides

Frequently Asked Questions

Yes. You can change dimensions in the browser with no signup required for standard use.

Yes. Lock Free, 16:9, 4:3, 1:1, and other presets so width and height stay proportional.

Stretch fills the box even if proportions change. Crop fills the box by trimming edges. Pad fits the image inside the box and fills empty space.

Usually not. Upscaling cannot invent detail — start from the largest source you have, then downscale for the web.

JPG, PNG, WebP, and other common rasters supported by the uploader.

Often yes for web or portal uploads — open Compress Image if you still need a smaller file size.

Use the free Resize Image tool at /image/resize. Cover Pakistan CNIC, NICOP, and passport photo sizes, background color, and a step-by-step CTA to the Passport & ID Photo tool. Include a short FAQ.

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