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Image Resizer

Resize photos to exact pixel dimensions or by percentage, with the aspect ratio locked or unlocked, for forms, websites and social posts.

Runs in your browser. Your data is not uploaded.How our tools work

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How do I resize an image?

Choose the image, pick Pixels for an exact width and height or Percentage to scale it, and keep “Keep aspect ratio” ticked so it isn’t stretched. Select Resize image and download the result. Keep the original format or save as JPG, PNG or WebP, up to 10,000 pixels per side.

  1. Select or drop the image you want to resize.
  2. Choose Pixels to enter an exact width and height, or Percentage to scale the image proportionally.
  3. Keep “Keep aspect ratio” ticked to avoid stretching. Change one dimension and the other updates automatically.
  4. Pick an output format and select Resize image. Check the new dimensions and file size, then download.

Why do resized photos sometimes look stretched, and how do you keep them in proportion? Read our guide: How to Resize an Image Without Distorting It

Key features

  • Exact pixel dimensions

    Enter the width and height a website, profile or form requires, for example 600 × 600 or 1080 × 1350.

  • Resize by percentage

    Scale to 25%, 50%, 75%, 150% or 200% with one click, or enter any percentage up to 400%.

  • Aspect ratio lock

    Keeps the proportions so faces and objects don’t look stretched or squashed.

  • Downscaling in steps

    Large reductions are done in halving steps, which keeps edges smooth and avoids the jagged look of a single big resize.

Common uses

  • Meet exact size requirements for passport, visa or exam photos
  • Prepare images for social media posts, banners and profile pictures

Supported formats and limits

Input
JPG, PNG, WebP, GIF (first frame), BMP, AVIF. HEIC where your browser supports it
Output
Same as original (JPG, PNG, WebP; other formats as PNG), JPG, PNG or WebP. Safari can’t save WebP
Maximum output size
10,000 px per side, about 16 megapixels in total
Maximum file size
40 MB

How much smaller does resizing make a file?

Resizing a 12-megapixel photo taken on an iPhone 14 (4032 × 3024 pixels, 3.7 MB) to 1600 × 1200 pixels at the default 90% quality took it to 548 KB in Chrome, 86% smaller, and still sharp on most screens. Halving both sides leaves a quarter of the pixels, which is why resizing saves far more than lowering the quality.

Resizing versus compressing

Resizing changes the number of pixels in an image. Compressing keeps the pixels but stores them more efficiently. Fewer pixels always means a smaller file, which is why resizing is usually the bigger saving.

If a form asks for a maximum file size in KB rather than dimensions, use a target-size compressor instead. If it asks for both, resize first and then compress.

Common image sizes

These are typical sizes; always check the current requirements of the site you’re uploading to.

  • Instagram square post: 1080 × 1080 px; portrait: 1080 × 1350 px
  • Full HD wallpaper or slide: 1920 × 1080 px
  • Website hero image: 1600–2400 px wide
  • Email newsletter image: 600–1200 px wide

Document photo sizes in pixels

Printed sizes in millimetres become pixels at 300 dots per inch: pixels = millimetres ÷ 25.4 × 300. For passport and visa photos, the passport photo maker also crops to the right shape and head position.

  • UK passport, digital photo: at least 600 × 750 px, 50 KB to 10 MB
  • India passport, online application: 630 × 810 px
  • Schengen visa, 35 × 45 mm: 413 × 531 px at 300 dpi
  • Canada passport, 50 × 70 mm: 591 × 827 px at 300 dpi

Related tools

Frequently Asked Questions

Will resizing reduce image quality?

Making an image smaller keeps it sharp: you only lose detail too fine to see at the smaller size. Making it larger can’t add detail that wasn’t captured, so enlarged images may look soft or blurry.

How do I resize without stretching the image?

Keep “Keep aspect ratio” ticked. The tool then calculates the matching height when you change the width, and the other way round.

How do I resize to an exact size like 600 × 600 when my photo isn’t square?

Untick “Keep aspect ratio” and enter both values. The image will be stretched to fit. To avoid distortion, crop the photo to a square first with the Image Cropper (choose 1:1), then resize it to 600 × 600.

Why is there a maximum size?

Browsers limit how large an image they can process in memory, especially on phones. The limit of about 16 megapixels works reliably on all modern devices.

Sources

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Related guides & tutorials

How to Resize an Image Without Distorting It

Why images stretch or squash when they are resized, how width, height and aspect ratio fit together, and a workflow that keeps every photo in proportion.

Read guide

Image Size vs Dimensions: What’s the Difference?

Image dimensions are pixels, image size is usually bytes, and they can move in opposite directions. What each means, what changes it and which one a form wants.

Read guide

How to Compress an Image Without Losing Too Much Quality

Practical steps to make images much smaller while keeping them sharp: resizing, choosing the right format and picking a sensible quality setting.

Read guide