Social Media Formatting
Apply common presets for Instagram, YouTube, X, and LinkedIn, or enter the dimensions required by the platform you use.
Pixel-Perfect Precision
Image Resizer
Resize images online by pixels, percentage, or common presets, with an optional aspect-ratio lock.
LocalImage Processing
LivePreview
FreeNo Watermark
PNG, JPG, WebP & more
Click to browse or drag & drop an image
Resize Settings
Select an image to get started.
PreviewNo image selected
Your resized image will appear here.
Select an image, then adjust the settings when you are ready.
No image selected yet.
Overview
What is Image Resizer?
The imglab Image Resizer is an online utility that changes the pixel dimensions of digital graphics and photos. Whether you need to reduce a large camera photo for a website, adjust an image for a social post, or meet an upload specification, the optional aspect-ratio lock can keep width and height proportional while you resize.
Step by Step
How to Use the Online Image Resizer
- 01
Upload or Select a Photo
Drag and drop an image file or choose one of the sample photos to start.
- 02
Set Target Dimensions
Choose a social preset or enter a custom width and height in pixels or as a percentage. Use the lock to preserve the aspect ratio.
- 03
Pick Format and Quality
Select PNG, JPEG, or WebP and adjust the quality control for the output you need.
- 04
Download the Resized Image
Select Resize Image to generate the result, review the preview, then download the resized image.
Key Use Cases
What You Can Do with Image Resizer
Custom Dimension Resizing
Enter exact pixel or percentage values with an optional aspect-ratio lock to avoid unintended stretching.
Web Asset Optimization
Reduce oversized source images to practical display dimensions before adding them to a website or application.
Multi-Format Export
Save the resized result as WebP, PNG with transparency, or JPEG for photographs and everyday sharing.
Advantages
Why Use Image Resizer on imglab?
Browser Smoothing and Preview
Browser image smoothing helps produce a practical result, while the preview lets you inspect the image before download.
Result Preview
Generate a resized result, then check its dimensions, file size, and visual preview before downloading.
Local Image Processing
Images selected for resizing are processed locally in your browser and are not sent to an imglab server.
No imglab Watermark
Download the result without an imglab watermark or account requirement.
Tips
Tips for Better Resizing Results
Keep the aspect-ratio lock enabled when you want to preserve the original shape of a photo. For the clearest result, start with the highest-quality source available, choose dimensions that match where the image will be displayed, and compare PNG, JPEG, and WebP exports when file size matters.
Image Resizer FAQ
Will resizing change the aspect ratio and distort my photo?
The Lock Aspect Ratio option is enabled by default. When you alter the width, the height updates proportionally so the photo keeps its shape. Unlock it only when you intentionally need non-proportional dimensions.
Can I resize an image by percentage instead of pixels?
Yes. Switch from Pixels to Percentage to scale the original image down or up by the amount you choose.
What is the best format for resized web images?
WebP is a useful modern option for many web images. PNG is appropriate when transparency or sharp interface graphics matter, while JPEG is commonly used for photographs. Compare the preview and downloaded size for your specific image.
Is there any file size limit for image resizing?
imglab does not impose a fixed upload limit for local resizing, but your browser, device memory, image dimensions, and file complexity determine what can be processed reliably. If a large image fails, try a smaller source file or a device with more available memory.