How to Resize Images Online in 3 Easy Steps
Follow these three simple steps to resize images by pixels or percentage. No software installation required. Free and secure.
Choose Your Images
Select supported images from your device, choose an entire folder, or drag and drop multiple files into the browser.
Set the New Dimensions
Choose By Pixels to enter a width and optional height, or choose By Percentage and select a preset or custom percentage. Use Crop to Fit or Stretch to Fit when both pixel dimensions are entered.
Resize and Download
Click “Resize,” review the resized images and output dimensions, then download files individually or save the completed batch as a ZIP file.
How Does the CompressFly Image Resizer Work?
The CompressFly image resizer changes image dimensions by exact pixels or by a percentage of the original size. When only a width is entered, the height is calculated from the original aspect ratio. Percentage resizing changes the width and height proportionally, while Crop to Fit or Stretch to Fit controls how an image fills the target when both pixel dimensions are set. Images are processed directly in your browser, individually or in bulk, with no files sent to a server.
What "in your browser" means
- No image files are sent to a server
- Resizing runs locally on your device
- Resized images are downloaded directly from your browser
Which Image Resize Method Should You Use?
Choose the resize method based on whether you need one proportional dimension, an exact frame, or a percentage of the original size.
Resize by Width
Enter a target width and leave the height blank to calculate it automatically from the original aspect ratio.
Crop to Exact Dimensions
Use Crop to Fit when the image should fill a specified width and height while maintaining its proportions. Content outside the target frame is removed.
Stretch to Exact Dimensions
Use Stretch to Fit when the output must match an exact width and height. The image proportions can change.
Resize by Percentage
Scale the width and height together with a preset or custom percentage. Values above 100% enlarge the dimensions but cannot restore missing detail.
Free Bulk Image Resizer Online
Resize 300+ images at once with the free bulk image resizer. Add individual files or an entire folder, apply the same pixel dimensions, fit method, or percentage to the batch, and download the completed images together as a ZIP file.
Batch image resizing runs directly in your browser, so files are not uploaded to a server. No account, credit card, or software installation is required.
Why Use CompressFly to Resize Images Online?
Fast Image Resizing
Resize images directly on your device without waiting for files to upload to or download from a server.
Bulk Image Resizing
Resize 300+ images with the same dimensions or percentage and download the completed batch as a ZIP file.
Multiple Image Formats
Resize JPG, JPEG, JFIF, PNG, WebP, AVIF, BMP, TIFF, and TIF images from one tool.
Preview Before Downloading
Preview each resized image and review its output file size before downloading.
Private & Secure
Your images are processed locally in your browser and are not uploaded to a server.
Free Access
Use the image resizer for free without signing up or entering credit card details.
Free Image Resizer FAQ
How do I resize an image online?
Resize an image online in three steps: 1. Select or drag and drop one or more supported images into the browser. 2. Choose By Pixels or By Percentage, enter the new dimensions, and select a fit method if needed. 3. Click “Resize,” review the results, then download files individually or save the completed batch as a ZIP file.
Is CompressFly’s image resizer free to use?
Yes. It’s free to use, with no daily limits or watermarks. No account or credit card is required.
What image formats can I resize?
The image resizer supports JPG, JPEG, JFIF, PNG, WebP, AVIF, BMP, TIFF, and TIF files.
What is the difference between resizing by pixels and percentage?
By Pixels lets you set a specific width and optional height. By Percentage scales both dimensions from the original size using a preset or custom percentage.
How can I resize an image without changing the aspect ratio?
Enter a width and leave the height blank to calculate it automatically from the original aspect ratio. Percentage resizing also changes both dimensions proportionally.
What is the difference between Crop to Fit and Stretch to Fit?
Crop to Fit maintains the image proportions, fills the target width and height, and removes content outside the frame. Stretch to Fit forces the image to the exact width and height, which can change its proportions.
Can I enlarge an image with this image resizer?
Yes. Enter pixel dimensions larger than the source or use a custom percentage above 100%. Enlarging adds pixels through interpolation but cannot restore detail that is not present in the original image.
What is the difference between resizing and compressing an image?
Resizing changes the image width and height in pixels. Compression changes how image data is encoded to reduce file size without necessarily changing its dimensions. Use the Image Compressor when file-size reduction is the main goal.
Can I resize an image to an exact KB or MB size?
This image resizer changes pixel dimensions and does not guarantee an exact output file size. For supported JPG, JPEG, PNG, and WebP files, use the Resize Image to KB or MB tool when a specific file-size limit is required.
Can I resize multiple images at once?
Yes. Add 300+ supported images or select an entire folder, apply the same resize settings, then download results individually or save the completed batch as a ZIP file.
Are my images uploaded to a server?
No. CompressFly resizes images directly in your browser, so the files are processed locally and are not uploaded to a server.