Image Resizer
Resize one or multiple JPG, PNG, or WebP images by maximum dimensions, width, height, longest side, or percentage. Keep proportions, prevent accidental upscaling, compare before-and-after dimensions and file sizes, then download individually or as a ZIP.
Each image fits inside these maximum bounds without cropping or stretching. A 2400 × 1600 image inside 1200 × 1200 becomes 1200 × 800.
The matching dimension is calculated automatically to preserve the image's proportions.
A 50% scale halves both width and height. Percentages above 100% enlarge the image but cannot restore missing detail.
Keep the original pixel dimensions while optionally changing JPG/WebP quality or export format. If format conversion is your main task, use the dedicated Image Converter.
After processing, every result shows original dimensions and file size beside the resized output. The preview updates to the processed image. Metadata such as EXIF data may not be retained.
How to resize images online
- Select one or more images. Add JPG, PNG or WebP files from your device.
- Choose the resize method. Fit images inside a box, set width or height, set the longest side, or scale by percentage.
- Protect smaller images. Leave “Do not enlarge” enabled when you do not want small files scaled upward.
- Keep or change the format. “Same as original” keeps resizing separate from format conversion.
- Resize and review. Compare original and output dimensions and file sizes, then download individually or as a ZIP.
Choose the right resize method
Fit within a box
Set maximum width and height. Each image keeps its proportions and fits inside both limits without cropping.
Width or height
Set one dimension and let the tool calculate the other. Useful when a website or workflow has one fixed edge.
Longest side
Give mixed portrait and landscape images one consistent maximum edge while preserving each image's shape.
Example: A 4000 × 3000 landscape image set to a 1600 px longest side becomes 1600 × 1200. A 3000 × 4000 portrait image becomes 1200 × 1600.
Why “do not enlarge” matters
Increasing pixel dimensions does not recreate detail that was missing from the source. If a 900 px image is already smaller than a 1600 px target, keeping the no-upscale option enabled leaves it at 900 px instead of manufacturing extra pixels.
This is especially useful for mixed batches where some images are already small enough and others still need to be reduced.
Batch resizing and ZIP downloads
Batch mode applies the same resize and export settings to every selected image. Each completed row shows its original dimensions and file size, output dimensions and file size, and the percentage size change.
Download files one at a time or use Download All (.ZIP) after processing. ZIP creation also happens in your browser. Very large batches can use substantial memory, so smaller batches are safer on phones or low-memory devices.
Image Resizer vs Image Converter
Use Image Resizer
Change width, height, longest side or percentage. You can optionally choose another export format after resizing.
Use Image Converter
Keep the dimensions but change JPG, PNG or WebP format. Open Image Converter.
Not sure?
Use File Confusion Fixer to understand file type, resolution and DPI choices.
Common image resizing questions
Will this crop or stretch my image?
No. The resize methods in this version preserve aspect ratio and do not crop. If you need an exact square from a rectangular image, you need cropping or padding rather than proportional resizing. The Aspect Ratio Calculator can help you calculate proportional dimensions.
Can I resize several images at once?
Yes. Select up to 30 images and apply one resize method and output setting to the batch. Mixed portrait and landscape images keep their own proportions.
Are my images uploaded?
The image-processing code in this tool uses browser APIs such as object URLs and Canvas. Selected image files are not sent to Designs24hr for the resizing operation. The website itself may still make normal network requests for page assets, analytics, ads, theme files or plugins.
Why did the output file become larger?
Dimensions, image content, output format and quality all affect file size. A smaller image can still produce a larger file if you export it to a less efficient format for that content.
Does “Same as original” preserve metadata?
No guarantee. The image is decoded and drawn to Canvas before export, so metadata such as EXIF information may not be retained even when the file type stays the same.
Does enlarging improve print resolution?
No. Enlarging changes pixel dimensions but does not restore missing fine detail or provide AI upscaling. This tool also does not set or verify print DPI metadata.
Related Designs24hr tools
- Image Converter
Change JPG, PNG and WebP format without making resizing the main task. - Aspect Ratio Calculator
Calculate proportional width and height before resizing. - File Confusion Fixer
Understand format, resolution and DPI choices. - File & Data Tools
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