Resize images by exact dimensions, percentage, or longest edge. Social media presets included.
Free Image Resizer Online
Resize images by exact dimensions, percentage, or longest edge. Social media presets included.
CHOOSE FILES
(or drag them here)
Resize Images Online
This tool changes the width and height of your images. You can set exact pixel values, scale by a percentage, or just define the longest edge and let the tool figure out the rest. It works with all common image formats and can handle many files in one batch.
If you need images for a specific platform like Instagram or YouTube, pick one of the built-in presets instead of looking up the correct size yourself. The tool applies the right dimensions automatically.
Three Ways to Resize
By Pixels
Type in the exact width and height you want. You can lock the aspect ratio so the image scales proportionally, or unlock it to stretch to your exact values.
By Percentage
Scale an image up or down by a percentage. Set 50% to make it half the size, or 200% to double it. Useful when you need proportional changes without calculating pixels.
By Longest Edge
Set one number and the tool makes sure the longest side of the image matches that value. The shorter side adjusts automatically to keep the original proportions.
Social Media Size Presets
Each platform has its own recommended image sizes. Instead of looking them up, just pick a preset and the tool sets the correct dimensions for you:
| Platform | Type | Size (px) |
|---|---|---|
| Post | 1080 x 1080 | |
| Story | 1080 x 1920 | |
| Cover Photo | 820 x 312 | |
| Twitter / X | Header | 1500 x 500 |
| YouTube | Thumbnail | 1280 x 720 |
| Banner | 1584 x 396 | |
| Pin | 1000 x 1500 | |
| Open Graph | OG Image | 1200 x 630 |
Tips for Better Results
Downscaling is safe
Making an image smaller always looks good. You are removing pixels, so the remaining ones still have their original detail. A 4000px photo scaled to 1200px will look sharp.
Upscaling has limits
Making an image larger means the tool has to create new pixels that did not exist before. The Lanczos algorithm does a good job, but a 200px image scaled to 2000px will look softer than one that was captured at that size.
Lock aspect ratio when possible
If you only set the width and leave height empty with aspect ratio locked, the tool calculates the correct height to avoid stretching. This keeps your image looking natural.
Combine with compression
After resizing, you can also reduce file size by lowering the quality setting. A resized and compressed image loads much faster on websites and takes less storage space.
Supported Formats
Upload any of these image types:
Frequently Asked Questions
How do I resize an image to exact dimensions?
Upload your image, go to the Resize tab, pick the dimensions mode, and type in your width and height. If you want to keep the image proportional, check the lock aspect ratio box.
What social media presets are included?
Instagram Post (1080x1080), Instagram Story (1080x1920), Facebook Cover (820x312), Twitter Header (1500x500), YouTube Thumbnail (1280x720), LinkedIn Banner (1584x396), Pinterest Pin (1000x1500), OG Image (1200x630), 1080p (1920x1080), and 4K (3840x2160).
Can I resize many images at once?
Yes. Upload multiple files and they all get resized with the same settings. Download them individually or as a ZIP archive.
Does making an image bigger reduce quality?
Upscaling creates new pixels through interpolation, which can make the image slightly softer. The tool uses Lanczos resampling for the best results, but starting from a higher resolution original will always give better output.
What formats can I upload?
PNG, JPG, JPEG, WebP, HEIC, HEIF, AVIF, TIFF, BMP, SVG, and GIF. The output can be saved as PNG, JPG, WebP, AVIF, TIFF, or BMP.
Is there a file size limit?
There is no strict file size limit. The tool handles large images well, though very large files may take a few extra seconds to process.