Free browser-based image tool

Image Resizer Online

Resize images online for free by exact pixels, percentage or preset sizes. Change JPG, PNG and WebP dimensions, keep aspect ratio, choose output format, preview the result and download the resized image for websites, social media, forms and everyday editing.

Browser-basedFree image resizerResize by pixelsResize by percentageSupports JPG / PNG / WebPNo signup

Privacy-friendly design: This image resizer is designed for browser-based processing, so it avoids unnecessary upload delay. Your original image remains unchanged and a new resized image is created for download.

Resize Controls

Upload an image, choose resize settings, preview the result and download the resized file.

Drag and drop an image here

Supports JPG, PNG, WebP, GIF and BMP up to 25 MB

Resize mode

Preset size

Width (px)

Height (px)

Lock aspect ratio

Resize fit

Fits full image inside the selected size.

Output format

Best for transparent graphics and sharp UI images.

Output file name

Correct extension is added automatically based on output format.

Preview

Compare the original image with the resized output before downloading.

Original

Upload an image to preview it here.

Resized output

Resize your image to preview the result here.

Original size

New size

Original file

Output file

Useful resizing tips

Keep aspect ratio locked when resizing photos to avoid stretching.
Use PNG for sharp graphics and transparency, JPG for smaller photo files and WebP for modern web optimization.
Use preset sizes for Instagram, banners, thumbnails and profile images to speed up your workflow.
Enlarging small images can make them blurry because new detail cannot be created from the original image.

How to resize an image online

Upload image

Select or drag and drop a JPG, PNG, WebP, GIF or BMP image into the upload area.

Choose resize mode

Use By Pixels for exact width and height, or By Percentage to scale the image larger or smaller.

Set dimensions or preset

Enter custom dimensions, choose a preset size, and keep aspect ratio locked when you want to avoid stretching.

Choose output format

Export the resized image as PNG, JPG or WebP depending on your use case.

Preview and download

Compare original and resized output, set the output file name and download the new image.

Use By Pixels mode when you need an exact size such as 1080 × 1080, 1200 × 628 or 1920 × 1080. Use By Percentage mode when you simply want to make an image smaller or larger, such as 50%, 75% or 200%.

Keep aspect ratio locked for photos to avoid stretching. Use contain mode to fit the full image inside the chosen dimensions, cover mode to fill the area, and stretch mode only when exact deformation is acceptable.

Resize images for websites

Prepare images for blogs, landing pages, product pages and portfolios. Resize large photos to web-friendly dimensions before uploading.

Resize photos for social media

Create profile photos, thumbnails, banners and post images using preset sizes or custom dimensions for different social platforms.

Resize images for forms and sharing

Reduce image dimensions before uploading to online forms, job portals, student applications, email attachments and WhatsApp sharing.

Best use cases

Resize product photos for ecommerce listings.
Resize screenshots before email or report sharing.
Create profile pictures and square social media images.
Prepare website hero images, banners and thumbnails.
Reduce large camera photos before uploading to forms.
Resize images for blogs, portfolios and presentations.

Image resizing tips

Keep aspect ratio locked for natural-looking photos.
Use WebP for modern web output with smaller file size.
Use JPG for photos where transparency is not needed.
Use PNG when transparency or sharp graphics are important.
Use contain mode when the full image must remain visible.
Use cover mode when you need to fill a fixed size.

Important note

Resizing changes image dimensions and may affect clarity. Enlarging small images can make them look blurry. Always preview the resized output before sharing it, uploading it or using it for important work.

The original image remains unchanged. Very large images may process more slowly on low-memory devices. Some animated GIFs may be loaded as a still frame depending on browser canvas support.

Image Resizer FAQ

Is this image resizer free to use?

Yes. SmartTools Image Resizer is free to use online for resizing images by pixels, percentage or preset sizes.

Does this image resizer upload my file to a server?

The tool is designed for browser-based processing, so your image can be resized directly in your browser without unnecessary upload delay.

Which image formats are supported?

You can upload common image formats such as JPG, PNG, WebP, GIF and BMP, and export the resized image as PNG, JPG or WebP.

Can I resize an image by exact pixels?

Yes. Choose By Pixels mode and enter the width and height you want. You can keep aspect ratio locked to avoid stretching.

Can I resize an image by percentage?

Yes. Choose By Percentage mode and enter a scale value such as 50% to make the image half size or 200% to double it.

What does aspect ratio lock mean?

Aspect ratio lock keeps the original width-to-height proportion. This prevents photos from looking stretched or squeezed.

Can I use preset image sizes?

Yes. You can choose preset sizes for social media, thumbnails, banners, profile photos and other common image needs.

Will the original image change?

No. The original image remains unchanged. The tool creates a new resized image for download.

Can I rename the resized image?

Yes. You can enter an output file name before downloading the resized image.

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