How to Resize images Without Distortion: Pixels and Percentages

Resizing pixels and compressing a file are different tasks

Resizing changes image width and height. Compression aims to reduce file size. If a form requires a width of 1200 pixels, start by resizing; if it only limits kilobytes, check the output file size as well.

The tool processes one image at a time. It accepts JPG, PNG, WebP and BMP files your browser can decode. It has no batch processing, sharpening control or automatic crop.

Prepare the file and target dimensions

The input file must be no larger than 20 MB. Output dimensions must be whole numbers from 1 to 16,384 pixels per side, with no more than 64 million pixels in total. A mobile device can run out of memory below those limits.

Keep the original and decide on a target width. Choose PNG or WebP for a transparent logo. JPG turns transparent areas white. Convert HEIC photos to a supported format before selecting them.

Example: resize 4000 × 3000 to 1200 × 900 pixels

This example preserves a 4:3 aspect ratio. Use the actual dimensions shown in Image summary; a different source ratio produces a different height.

1. 1

   Select one image

   Use the file selection area to choose a JPG, PNG, WebP or supported BMP. Check its dimensions and file size in Image summary.

2. 2

   Preserve the aspect ratio

   Leave Maintain aspect ratio checked. Enter 1200 in Width (px). For a 4000 × 3000 original, Height (px) updates to 900.

3. 3

   Choose pixels or a percentage

   Alternatively, a 50% scale turns that original into 2000 × 1500. Percentages apply to the original dimensions, not to a previous resized result.

4. 4

   Choose an output format

   Use JPG for a photo without transparency or PNG/WebP to preserve transparent areas. Quality is available for JPG and WebP; PNG does not use that setting.

5. 5

   Generate and compare

   Select Resize image. Compare Original and Resized, check the dimensions and review the actual output file size. Fewer pixels do not guarantee a specific number of KB.

6. 6

   Download the result

   Use the result's download button. Open the saved file and confirm it measures 1200 × 900 before sending or publishing it.

Use presets without stretching the image

Presets set an exact width and height: Square Post uses 1080 × 1080 and YouTube Thumbnail uses 1280 × 720. These are tool options; check the current requirements of your publishing destination.

A preset does not crop or add padding. Directly resizing a 4:3 photo to 1080 × 1080 stretches its content even if the aspect-ratio box remains checked. To preserve the shape, enter a width with Maintain aspect ratio enabled; for an exact square, prepare a square original first.

Save a resized image on your phone

Select the file using your browser's file picker. Once resizing finishes, select the download button and check the browser's downloads or your chosen destination folder.

The file does not necessarily appear automatically in Photos or your gallery. If the browser opens a preview, use its save or share options. For large images, start with smaller output dimensions to reduce memory use.

Your image is processed in the browser

Resizing handles the image on your device without uploading it to a processing API. Downloading creates a new file; keep the original so you can try other sizes.

Fix distorted images and failed downloads

Stretched image: restore the original dimensions, enable Maintain aspect ratio and change only width or height. Avoid presets with a different aspect ratio from the original.

Blurry image: shrinking and then enlarging does not restore detail. Return to a higher-resolution original. This tool does not add AI detail or provide a sharpening control.

BMP export unavailable: some browsers decode BMP but cannot encode it. Select JPG, PNG or WebP under Output format.

Memory error or empty output: reduce the dimensions and select Resize image again. After changing a setting, generate a new result before downloading.

Frequently asked questions