Bulk Image Resize Tool
This image resize tool lets you complete everything in the browser, from specifying size and output format to ZIP compression.
You can resize multiple images in bulk, or just resize a single image.
In addition to width and height, long side and short side settings, it also supports format conversion without resizing, and lets you flexibly adjust how images fit within the frame and the suffix added to output file names.
Add Images
You can add multiple images such as PNG / JPEG / WebP / AVIF at once. Drag and drop is also supported.
Resize Settings
Processing status will be displayed here after you add images.
Loaded File List
You can reorder by drag and drop. Hover over a thumbnail to enlarge it, and hover over a file name to view file details and EXIF information.
Initialize settings?
Restore the current save settings to their initial state.
Features of the Bulk Image Resize Tool
This tool is an online utility that lets you adjust multiple image sizes at once and save them in the format you need. It is useful when you want to finish everyday image processing tasks in a short time, such as organizing images for blog posts, standardizing the size of product images for e-commerce, reducing the weight of materials for social media posts, or adjusting file sizes before pasting them into internal documents.
Process multiple images together under the same conditions
You can load multiple files at once and apply the same size settings in one batch without opening editing software for each image. This directly reduces work time.
Choose between long side, short side, or width and height settings
Because you can switch resize criteria and how the image fits within the frame according to your purpose, it is easy to prepare images in the most suitable way for each use case, such as for web publishing, thumbnail lists, print preparation, or format conversion only.
Supports ZIP saving
Even when processing a large number of images at once, you can save the results together as a ZIP file. This eliminates the need to download them one by one and makes organization and sharing smoother.
Browser-based completion, so no upload is required
Files are processed only within the browser, so you can resize confidential unpublished production images or materials before internal sharing without uploading them externally.
Useful in situations like these
Resize images to an optimal size in bulk before posting them to blogs or media. Downsizing and reducing weight help pages load faster and make viewing more comfortable.
When you want to align product images for e-commerce sites or flea market listings to the same ratio and the same long-side size to unify the appearance of list pages.
When you want to reduce the weight of images for social media posts or sales materials and keep the appearance intact while reducing only the file size.
How to Use
- Add images in bulk and choose the size mode that matches your purpose. You can select how to resize from width and height, long side, or short side settings.
- When outputting as JPEG, WebP, or AVIF, set the quality level. As a guideline, around 85 for JPEG, around 75 for WebP, and around 60 for AVIF make it easier to balance image quality and file size.
- In "Append to file name," specify the string to add to the end of the output file name. The specified string is appended to the original file name when output. If left blank, the original file name is used.
- If you enable "Do not resize images smaller than the specified size," images smaller than the specified size can be excluded from resizing, helping you avoid quality loss and unnecessary processing.
- If you enable "Preserve EXIF data," resized images can keep EXIF data when the original image contains it.
- The list of images added to the "Loaded File List" is displayed. You can hover over file names to check thumbnails and EXIF information.
- Press "Resize and Download ZIP" to convert all images and download them together as a single ZIP file. "Resize and Download Individually" converts and downloads each image one by one.
Usage Tips
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In the size mode "Specify width and height," you can choose from three handling methods when the original image does not exactly match the resized dimensions.
- 余白追加：The image is reduced while keeping its aspect ratio, and its height or width is matched to the specified size. Any remaining area is filled with the selected padding color.
- 切り抜き処理：The image is scaled to match the specified size, and the overflowing parts are trimmed based on the center. There is no padding, and the frame is completely filled.
- 強制引き伸ばし：The image is stretched or shrunk to exactly match the specified size without preserving aspect ratio. There is no padding or cropping, but distortion may occur because the aspect ratio is not maintained.
- The size mode "Specify the long side" is convenient when landscape and portrait images are mixed. "Specify the short side" is suited to creating thumbnails or list images with a consistent feel.
- If you select "Do not resize" in the size mode, you can convert only the image format without changing the image dimensions.
- The order of file names can be changed by dragging, and it is also reflected in the order inside the ZIP.
- When loading a large number of images at once, enabling "Hide thumbnails" skips thumbnail generation and display, making the page lighter and improving processing speed.
- When saving in JPEG, WebP, or AVIF format, setting the quality to 100 minimizes quality loss caused by compression. WebP and AVIF can use lossless compression, allowing storage without degradation. JPEG uses lossy compression, so there is theoretically slight degradation, but it is almost impossible to distinguish with the human eye.