How to Batch Resize Images Online
Resize multiple images at once to any dimension. Free browser-based batch resizing with no uploads required.
Whether you're preparing product photos for an e-commerce store, optimizing images for a blog, or creating social media content, batch resizing saves hours compared to editing images one by one.
ConvertCraft's Image Resizer processes all your images locally in the browser. You can set a target width, height, or both — and the tool maintains aspect ratios automatically.
To batch resize: open the Image Resize tool, select all the images you want to resize, enter your target dimensions, and click Resize. The tool processes each image and provides a ZIP download of all results.
The resizer supports all common image formats: JPG, PNG, WebP, AVIF, GIF, and BMP. You can even convert formats during the resize operation.
For social media optimization, use the built-in presets: Instagram Post (1080×1080), Twitter Header (1500×500), Facebook Cover (820×312), and more.
Frequently Asked Questions
How many images can I resize at once?
You can resize up to 50 images in a single batch. Each image is processed independently in your browser.
Will resizing reduce image quality?
Downscaling (making smaller) preserves quality. Upscaling (making larger) may introduce slight softness. The tool uses high-quality Lanczos resampling for the best results.
Can I set a maximum file size instead of dimensions?
The resize tool works with pixel dimensions. To reduce file size, use the Image Compress tool which offers quality-based compression.