How to Batch Resize Images Without Installing Software
Resizing a folder of images to consistent dimensions saves storage, speeds up uploads, and keeps your CMS tidy — here's how to do it in your browser.
Inconsistently sized images cause broken grids, slow pages, and CMS headaches. A product gallery where one image is 3000×2000 and the next is 800×600 looks unprofessional and forces browsers to do layout work they shouldn't have to. Resizing to consistent dimensions before upload is one of those unglamorous tasks that pays off every time.
Three Ways to Resize an Image
- ●Exact pixels: Set a specific width and height. You can lock the aspect ratio (recommended) or stretch to fill the target dimensions.
- ●Percentage: Scale down proportionally — "50%" halves both dimensions and reduces file size by approximately 75%.
- ●Social media preset: Choose a platform and post type; the tool fills in the correct dimensions automatically.
How to Resize an Image Online
- 1.Open imagepdf.tools/resize-image
- 2.Drop your image onto the page
- 3.Choose By Size, Percentage, or Social Media tab
- 4.Enter the target dimensions or pick a preset
- 5.Click Resize & Download
Enable "Do not enlarge" to prevent upscaling — resizing a small image to a larger size adds no detail and makes files bigger. The option is especially useful when processing batches of mixed-size images.
What Size Should I Resize To?
It depends entirely on where the image is going. General guidelines:
- ●Blog post images: 1200–1600px wide. Most CMS templates don't need more.
- ●Product photos (e-commerce): 2000×2000px at most. Shopify and WooCommerce scale down from the source.
- ●Email images: 600px wide maximum — most email clients render in a 600px column.
- ●Social media: Use the platform presets — each platform has specific optimal dimensions.
- ●Thumbnails: 300–500px wide. Anything larger is wasted bytes in a small container.
Resize vs. Compress: What's the Difference?
Resizing changes the pixel dimensions of the image. Compressing reduces the file size by removing data within those dimensions. For the smallest possible output, do both: resize to the largest dimension the image will ever be displayed at, then compress. A 4000px image resized to 1200px and then compressed to quality 80 will be dramatically smaller than the original, with no visible quality loss at its displayed size.
After resizing, compress the result at imagepdf.tools/compress-image. Both steps run entirely in your browser.
Ready to try it?
All tools run entirely in your browser — no uploads, no account required.
Resize Image