Batch Resize Images Online Free
Batch Image Resizer lets you resize multiple images at once online free — no sign up, no upload, no watermark. Drop in a whole folder of photos, set a max width and height or a percentage scale, and every image is resized right in your browser. Your images never leave your device. One image downloads on its own; several come back as a single ZIP.
Drop your images on the box above, set a max width/height or a percentage scale, then tap Resize. Several images download together as a ZIP — all done in your browser, nothing uploaded.
Ready to resize a batch? It takes one tap.
Use the free Batch Image Resizer →How to resize multiple images at once
Resizing a whole batch takes three steps, and every step runs on your own device — this is how you resize multiple images at once online free without ever uploading them to a server.
- Open capsuletools.app/batch-image-resizer/
- Drop your images onto the box, or tap to pick them from your device (add more at any time)
- Choose how to resize — a max width/height, or a percentage — then tap Resize
- One image downloads directly; a batch downloads as a single
resized-images.zip
There is no per-file limit set by a server and no queue, because nothing is sent anywhere. The whole batch — decode, resize, re-encode, zip — happens inside your browser tab.
Resize options: max dimensions vs. percentage scale
There are two ways to set the target size, and both keep every image's aspect ratio so nothing is stretched:
- Fit within — set a max width and/or height. Each image is scaled down to fit inside that box. Leave one field blank to size purely by the other (e.g. a max width of 1080 with no height makes every image 1080px wide). Set both to resize multiple images to the same size box.
- Scale % — shrink (or enlarge) every image by the same percentage, such as 50% for half size.
In Fit within mode, an image that is already smaller than your target is left at its original size — it is never enlarged, so you never get a blurry upscaled result. The live preview shows each image's new → width×height as you type, so you can batch resize images to a specific size with confidence before you download.
Output formats and quality
By default each image keeps its Original format, so a batch of JPGs stays JPG and PNGs stay PNG. Open Output format to convert the whole batch to JPG, PNG, or WebP instead, and use the quality slider to trade file size against detail for the lossy formats (JPG and WebP). JPG output is flattened onto a white background since JPG has no transparency.
JPG or WebP at around 70–80% quality are the usual choices to batch resize images for web publishing — smaller files that keep pages fast — while PNG or Original is best when you need to preserve transparency.
RAW and HEIC support
Phones and cameras produce formats most online resizers choke on. Batch Image Resizer decodes them on intake, so you can batch resize photos straight from an iPhone or a camera card:
- HEIC
- DNG
- CR2
- CR3
- NEF
- ARW
- RAF
- ORF
- RW2
- JPG
- PNG
- WebP
- GIF
- BMP
iPhone ProRAW and HEIC photos are converted to a standard image automatically before resizing — no separate conversion step needed.
Can you resize images in bulk without uploading?
Yes — that is the whole point of this tool. Unlike most bulk image resizer online free services that upload your photos to a server to process them, Batch Image Resizer runs entirely in your browser using the HTML Canvas API. This free multiple image resizer online does everything on your device: your images are never transmitted anywhere, there is no account, and it keeps working offline once the page has loaded. It is also installable: add it to your home screen and it behaves like a native batch image resizer app on Mac, Windows, iPhone, and Android.
Frequently asked questions
Can you resize images in bulk for free?
Yes. Batch Image Resizer resizes images in bulk for free with no account and no upload. Drop in as many images as you like, set a max width/height or a percentage scale, and every image is resized in your browser. One image downloads directly; several come back together as a single ZIP.
How do I resize multiple images at once online?
Open the tool, drop or pick your images, then choose how to resize: a max width and/or height to fit inside, or a percentage scale. Tap Resize and the batch is processed on your device. There is no waiting for an upload — the images never leave your browser.
How do I batch resize photos on Mac or Windows?
You do not need a Mac or Windows app. Batch Image Resizer runs in any modern browser — Chrome, Safari, Edge, Firefox — on macOS, Windows, ChromeOS, iPhone, iPad, and Android. Pick your photos, set the target size, and download the resized batch as a ZIP. Nothing is installed and nothing is uploaded.
Can I resize multiple images to the same size?
Yes. Use Fit within and set a max width while leaving max height blank, and every image is resized to that exact width (heights vary with each image's aspect ratio). Set both a max width and height to fit every image inside the same box. Aspect ratio is always preserved, so images are never stretched.
What happens to the aspect ratio when I batch resize?
Aspect ratio is always kept — images are scaled proportionally, never stretched. In Fit within mode an image is scaled down to sit inside the width/height box you set, and an image already smaller than the box is left at its original size (it is never enlarged or blurred). Percentage mode scales every image by the same factor.
What image formats are supported?
You can drop in JPG, PNG, WebP, GIF, BMP, HEIC, and RAW files (including iPhone ProRAW and camera DNG/CR2/NEF/ARW). Output can be the original format, or you can convert the whole batch to JPG, PNG, or WebP and set a quality level for the lossy formats.
Use the free Batch Image Resizer →
