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Define your dimensions by pixels or percentage and resize JPG, PNG, SVG, GIF, and WebP images quickly.
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Supports JPG, PNG, SVG, GIF, WebP | Max size: 50MB
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Everything you need to resize your images quickly without complicated software.
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Resize by pixels or percentage with complete control.
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Free Image Resizer Online: Resize Photos by Pixels or Percentage
Need to change the width or height of a photo without installing image-editing software? XConvertifire's free image resizer lets you resize images online using exact pixel dimensions or percentage-based scaling.
Upload a supported JPG, PNG, WebP, SVG or GIF file, enter your preferred dimensions and download the resized result. The tool processes selected images in your browser and provides an aspect ratio control to help you avoid unwanted stretching.
Resizing is useful when an image is too large for a website layout, needs different dimensions for a document or must fit an upload requirement. However, changing image dimensions does not guarantee a smaller file size or identical visual quality.
How to Resize an Image Online
Follow these four steps to resize your image.
Step 1: Upload Your Image
Click Choose File or drag an image into the upload area. The tool accepts JPG/JPEG, PNG, WebP, SVG and GIF files up to 50 MB each.
Only one image is processed at a time.
Step 2: Choose Pixels or Percentage
Select Pixels when you need specific image dimensions. Enter your preferred width and height.
Select Percentage when you want to scale an image relative to its original dimensions. For example, setting both dimensions to 50% reduces the original width and height by half.
Step 3: Adjust the Aspect Ratio
The Keep Aspect Ratio option is enabled by default.
When enabled, changing the width automatically calculates a proportional height, and changing the height calculates a proportional width.
You can unlock the ratio to enter independent dimensions, but doing so may stretch or distort the image.
Click Resize Image when the settings are ready.
Step 4: Review and Download
After processing, the tool displays the original dimensions, new dimensions and output file size.
Review the resulting preview and click Download Image.
Use Resize Another Image to start again with a different file.
Resize Images by Pixels or Percentage: What's the Difference?
Both methods change image dimensions, but they are useful in different situations.
Resize an Image by Pixels
Pixel resizing is appropriate when you know the exact dimensions required.
For example, suppose you have a photograph measuring 1200 × 800 pixels and want a smaller version that maintains the same proportions.
With the aspect ratio locked, entering a width of 600 pixels calculates a height of approximately 400 pixels.
This is useful for preparing photos for websites, documents, online forms and other projects with specific dimension requirements.
Resize an Image by Percentage
Percentage resizing scales an image relative to its original dimensions.
For example, a 1600 × 900 pixel image resized to 50% of its original width and height becomes 800 × 450 pixels.
Percentage resizing is useful when you want a smaller or larger version without calculating new dimensions manually.
If you need proportional scaling, leave Keep Aspect Ratio enabled.
How to Maintain Image Aspect Ratio
An image's aspect ratio describes the relationship between its width and height.
A 1200 × 800 pixel image has a 3:2 aspect ratio. When resized proportionally to 600 × 400 pixels, it keeps the same shape.
If the same image is forced into dimensions of 600 × 600 pixels without cropping, its content may appear stretched or squeezed.
XConvertifire's aspect ratio lock helps calculate proportional dimensions automatically.
For an image that must fit a differently shaped space, simply unlocking the ratio is not always the best solution. Cropping may produce a more natural-looking result.
To remove unwanted edges or change the visible composition, use the online image cropper.
Resize JPG, PNG, WebP, SVG and GIF Images
Different image formats behave differently when resized. Understanding those differences helps you select the right workflow.
Resize JPG and JPEG Photos
JPG and JPEG are widely used for photographs.
The resizer can scale a JPG image to new pixel dimensions and export the result as a JPG file.
Downscaling may produce a smaller file, but the output depends on the original photograph and image encoding. Very small output dimensions can make details or text difficult to see.
Enlarging a JPG cannot restore detail that was not present in the original.
Resize PNG Images
PNG is commonly used for screenshots, illustrations, logos and graphics that require transparency.
When a PNG is resized through this tool, it is exported as PNG in the normal raster resizing workflow.
Keep the aspect ratio locked when the original proportions matter. Review thin lines and small text after reducing the dimensions.
If you need to change the file format rather than its dimensions, use the online image converter.
Resize WebP Images
WebP is a useful image format for many modern websites.
The resizer can adjust the pixel dimensions of supported WebP images and export the result as WebP when browser encoding supports it.
Review the downloaded file and its quality before publishing. Resizing and re-encoding can affect the appearance and file size.
Resize SVG Graphics
SVG is a vector-based format often used for logos, icons and scalable illustrations.
For SVG inputs, XConvertifire updates the width and height attributes in the SVG markup rather than applying the same canvas-resizing process used for raster images.
SVG rendering also depends on its internal markup and viewBox configuration. If the result looks unexpected, inspect the output before using it.
What Happens When You Resize a GIF?
GIF uploads are supported, but animated GIF resizing has an important limitation.
The current tool processes GIF input through a browser canvas and exports a PNG still image.
This means an animated GIF's animation is not preserved.
Use a dedicated animated GIF editor when your goal is to resize an animation while retaining its frames.
Resize, Crop or Compress: Which Tool Should You Use?
These three image-editing tasks solve different problems.
Resize an Image
Resizing changes an image's width and height in pixels.
Use it when an image needs different dimensions for a layout, document or online form.
Crop an Image
Cropping removes part of an image to change its visible composition.
Use cropping when you need to remove unwanted areas or prepare an image for a different shape without stretching the subject.
Compress an Image
Compression focuses on reducing file size, often by changing encoding settings.
An image can have the correct pixel dimensions but still be too large in KB or MB.
If your dimensions are already correct and you want to reduce the download size, try the free image compressor.
Resizing and compression can be used together, but neither guarantees a particular final file size.
Common Reasons to Resize Images
Website and Blog Images
Large images are not always necessary for smaller page components.
Preparing images at suitable pixel dimensions can help avoid unnecessarily large assets.
For responsive websites, developers should also consider how different image sizes are delivered to different devices. Google's responsive images guide explains this in more detail.
Profile Pictures and Social Media
Profile photographs, thumbnails and social images often need particular dimensions or aspect ratios.
Check the current requirements of the platform where the image will be used.
If an image needs a different shape rather than proportional scaling, cropping may be more appropriate than stretching.
Online Applications and Forms
Forms may impose limits on pixel dimensions, file type or file size.
The resizer can help with width and height requirements. It does not guarantee a specific file size such as 100 KB or 200 KB.
Always review the downloaded file before submitting it.
Documents, Presentations and Email
Oversized images can be inconvenient when added to documents or shared with other people.
Resizing may help produce an image with more appropriate dimensions for the intended use.
Keep an original copy if you may need the full-resolution image again.
Tips for Resizing Images Without Unnecessary Quality Loss
Keep the original proportions. Leave the aspect ratio lock enabled unless you intentionally need independent dimensions.
Avoid unnecessary enlargement. Upscaling adds pixels through interpolation rather than recreating missing detail.
Check text and fine details. Screenshots, diagrams and images containing small text can become difficult to read after strong downscaling.
Choose dimensions for the final use. Start with the actual requirements of your website, form, document or destination platform.
Understand the difference between dimensions and file size. An image's pixel dimensions and its KB/MB file size are different measurements.
Preserve your original. Keep the full-resolution file so you can create another version if necessary.
For more technical background on image scaling, read the MDN guide to canvas image drawing.
Frequently Asked Questions About Image Resizing
Resize Your Image Online for Free
Whether you need a smaller JPG photo, different PNG dimensions or a proportionally scaled WebP image, XConvertifire helps you resize supported images using pixels or percentages.
Select your image, choose the dimensions, keep the proportions you need and review the output before downloading.
Resize Your Image Now