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Image Resizer

Resize an image using pixel dimensions and an aspect-ratio lock. Check output dimensions and distinguish resizing from guaranteed file-size compression.

Prepare an image for a required pixel width or height. Lock Aspect Ratio links the two fields so a change to one adjusts the other. Unlocking it permits an exact width and height but can stretch the picture. Pixel dimensions do not directly determine file size in KB.

  • 100% free
  • No registration
  • On your device
  • Modern browser
  1. 1Choose files
  2. 2Choose options
  3. 3Download
Drag & drop your image hereor click the button below to choose a fileSelect images

or drag & drop files here

Images · Up to 50 MB per file.

Tip: You can also paste files directly (Ctrl+V / Cmd+V)

Files are processed on your device. See privacy details below for optional services.

Your input stays on this device for this operation. We don’t upload or store it.

About Image Resizer

Prepare an image for a required pixel width or height. Lock Aspect Ratio links the two fields so a change to one adjusts the other. Unlocking it permits an exact width and height but can stretch the picture. Pixel dimensions do not directly determine file size in KB.

Linked pixel dimensions

The aspect-ratio checkbox keeps width and height proportional.

Percentage shortcuts

Available controls scale the current dimensions rather than cropping the image.

Allocation checks

Rejects dimensions above 8,192 per side or 16 megapixels total.

How to use Image Resizer

  1. 1

    Choose the image

    Add a browser-decodable image within the 20 MB input limit.

  2. 2

    Set dimensions

    Enter Width (px) or Height (px) with the aspect-ratio lock on, or deliberately unlock it to set both independently.

  3. 3

    Apply and inspect

    Press Apply Resize, inspect the preview and download. Verify dimensions in the downloaded file before uploading elsewhere.

Formats and practical limits

Input: one browser-decodable image, up to 20 MB. Output: a resized raster; the canvas requests the source MIME type, with browser-dependent encoder support.

  • Animated inputs are treated as a still image; source metadata is not preserved by canvas re-encoding.
  • Format support differs by browser. Inspect the actual output format rather than relying on the source extension alone.

Practical example

For an 800×600 photo, keeping the aspect-ratio lock on and entering width 400 gives height 300. Entering 400×400 with the lock off stretches the original.

Frequently Asked Questions

3 answers
Will resizing crop my photo?

No. It rescales the image. Use Crop Image when you need to remove part of the composition.

Can enlarging restore detail?

No. Larger output dimensions do not recreate detail absent from the source.

Will a 600-pixel image meet a 100 KB limit?

Not necessarily. Encoded size also depends on content and format. Use Image Compressor separately when a JPEG quality adjustment is appropriate.

Related Image tools

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Crop Image

Crop images with freeform and preset aspect ratios.

Image Compressor

Compress images locally, with automatic resizing for large photos and HEIC support.

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