Keep the aspect ratio locked
Enable the aspect ratio lock when you want to resize an image while keeping its original proportions. This helps prevent stretched faces, logos, products, and other visual elements.
Image Resizer
Batch supportedNo files loaded yet
Drop images on the canvas
Upload up to 50 images for batch resizing with ZIP download
JPG · PNG · WebP · GIF
About Image Resizer
AI Genzox provides a free way to resize image online without installing desktop software or creating an account. Upload an image, enter the width and height you need, control the aspect ratio when necessary, choose an available output format, and download the result.
The Image Resizer works as an image size resizer and image size changer for users who need precise pixel dimensions. You can change image size in pixels by entering custom width and height values rather than relying on an approximate scale.
If the original proportions should remain unchanged, enable the aspect ratio lock. This lets you resize an image and keep its aspect ratio while adjusting one dimension. If you intentionally need a different proportion, the width and height can be controlled independently.
Resizing can also reduce image resolution when you reduce the number of pixels used by the image. For example, a smaller width and height produce a lower-dimensional version of the source. Pixel resizing should not be confused with DPI or PPI editing, and the tool does not provide AI super-resolution or detail generation.
The workspace supports up to 50 images per batch, with each file up to 50 MB, scaling from 1% up to a maximum 200% upscale, and output dimensions from 1 to 10,000 pixels. Output formats include Original, PNG, WebP, JPG, and JPEG with quality controls for supported formats. Completed batches can be downloaded individually or packaged into a single ZIP archive.
Whether you need to change picture size for a website, adjust a photo for a profile, reduce image dimensions for a thumbnail, or meet an exact pixel requirement, the tool keeps the workflow focused on resizing rather than cropping, compression, or format-conversion tasks.
Image processing is handled temporarily on the server. The uploaded image is used for the resize operation and temporary processing files are cleaned up as part of the processing lifecycle.
New to Image Resizer Guide?
Learn how to resize single images or batches up to 50 files with percentage scaling, exact dimensions, and ZIP downloads.
Help & Tips
Get the best results from Image Resizer
Resize by exact pixel size
Enter the precise width and height required by a website, profile, form, thumbnail, or other destination. Pixel dimensions give you predictable output sizing.
Choose an appropriate output format
Use an available format that matches your workflow. WebP and JPEG can suit many web and photo uses, while PNG is useful when transparency or lossless output matters.
Avoid unnecessary large upscaling
Increasing dimensions cannot recreate photographic detail that is missing from the original. Upscaling is capped at a maximum of 200% of original dimensions to protect image quality.
Use percentage scaling for batches
Percentage scaling (from 1% to 200%) derives proportional dimensions for every file in a batch, while pixel mode lets you set exact dimensions for specific assets.
Balance output quality
For formats that provide quality control, choose a setting that suits the final use. Higher quality can increase output size without always producing a noticeable visual benefit.
How to Resize an Image Online
Change image dimensions in four simple steps
1
Upload Images
Select or drag and drop up to 50 supported images. Common formats such as JPG, PNG, WebP, and GIF can be processed in batch.
2
Set the Dimensions
Choose a percentage scale from 1% to 200% for shared batch resizing, or switch to pixel mode to enter custom width and height with aspect ratio lock.
3
Choose Format and Quality
Keep the original format or choose WebP, PNG, JPG, or JPEG, and tune quality settings when applicable.
4
Resize and Download
Process the image or batch using your selected dimensions, review the result, and download individual files or a combined ZIP archive.
Why Choose Our Free Image Resizer
Exact pixel control
Change image size in pixels by entering precise width and height values instead of relying on approximate dimensions.
Temporary server processing
The image is temporarily uploaded to AI Genzox for server-side resizing and processing. Temporary processing files are cleaned up as part of the processing lifecycle.
Flexible output formats
Keep the original file format by default, or export to WebP, JPEG, JPG, or PNG with quality controls where supported.
Perfect For
Social Media
Resize photos and graphics to the pixel dimensions required for posts, profile images, thumbnails, and other platform assets.
Web Design
Prepare website images, banners, thumbnails, and visual assets at the dimensions your layout requires.
Profile Pictures
Change photo size to the exact pixel dimensions needed for avatars, profile images, and account pages.
Creative Work
Adjust image size for product photos, graphics, presentations, project assets, and other visual content.
Frequently Asked Questions
Can I resize an image online for free?+
Yes. AI Genzox lets you resize images online for free without creating an account. Upload your images, set the dimensions or scale you need, adjust the aspect ratio or output settings, and download individual files or a ZIP package.
Can I change image size online to exact dimensions?+
Yes. Enter the exact width and height in pixels to change image size online to the dimensions you need. The aspect ratio lock can keep the original proportions while you adjust one dimension.
Can I resize an image by pixel size?+
Yes. You can resize an image by pixel size by entering custom width and height values. This gives you direct control over the final pixel dimensions instead of relying on approximate sizing.
How do I resize an image and keep its aspect ratio?+
Enable the aspect ratio lock before changing the width or height. The other dimension will adjust with it so the image keeps its original proportions instead of becoming stretched or compressed.
Can I resize an image by aspect ratio?+
Yes. The aspect ratio lock lets you resize an image while preserving its proportions. You can also enter independent width and height values when the final image intentionally needs a different ratio.
Can I reduce image resolution by resizing it?+
Yes. Reducing the pixel dimensions of an image also reduces its pixel-based resolution. For example, making an image smaller in width and height creates a lower-dimensional version. This is different from changing DPI or PPI.
Can I reduce image resolution without losing quality?+
Reducing dimensions can preserve good visual quality when the output is appropriately sized and the source image is suitable. However, no resize operation can guarantee zero quality loss in every image or output format.
What happens if I resize an image larger than the original?+
Upscaling is supported up to a maximum limit of 200% of the original dimensions. However, enlarging an image cannot create missing photographic detail and large increases can make edges look softer, so starting with the highest-resolution source available is recommended.
Can I change the size of a photo or picture?+
Yes. You can change photo size or picture size by entering the desired width and height in pixels. The aspect ratio lock can be used when you want to preserve the original proportions.
Can I resize multiple images at once?+
Yes. You can upload and resize up to 50 images in a single batch. Shared dimensions or percentage scaling apply across the batch, and completed images can be downloaded individually or together in a single ZIP archive.
What image formats are supported?+
The resizer accepts common image formats including JPG, PNG, WebP, and GIF. Output formats include Original (preserves source format by default), PNG, WebP, JPG, and JPEG.
Is there a maximum file size or image dimension?+
Yes. The workspace supports batches of up to 50 images, with each file up to 50 MB, scaling up to 200% maximum, and supported output dimensions from 1 to 10,000 pixels.
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