Private, on-device processing
All image work happens in your browser on your computer or phone. Your photos never leave your device.
ImageSize
Resize & compress photos — fast, private, in your browser
Reduce file sizes for email, messaging apps, social media, or storage without uploading your photos to Internet.
📁
Drop images here or click to browse
Supports: JPEG, PNG • Max 50MB per file
Key features
Perfect for email and messaging apps
Quickly reduce photos so they will attach to email, WhatsApp, Slack, or other apps. You can set a total size for a batch or limits per image so messages and uploads go through without problems.
Simple controls, two ways to choose a size
Use the quick slider for an easy pick or enter an exact size if you want precise control. Both options stay in sync.
Keeps pictures looking good - set a minimum quality
Choose a minimum quality level to avoid over-compressing. This makes sure photos do not become too blurry while still shrinking file size.
Resize by pixels or by percentage
Want the image to be a specific width/height (pixels) or just scale it down (percent)? You can do either.
Process many photos at once
Drop a folder or several images and process them all in one go. Saves time when you have lots of photos.
Live estimates and previews
See estimated sizes and small previews next to each photo before you download anything so you know what to expect.
Originals kept if the target cannot be met
If a photo cannot be safely reduced to your chosen size without dropping below the minimum quality, ImageSize keeps the original file and clearly marks it so you can choose what to do.
Download individually or as a ZIP
Save single processed images or download them all in one ZIP archive.
No account or upload required
No sign-in, no server storage - just open the tool and use it.
How to use (3 quick steps)
1
Drag and drop photos or click to browse.
2
Pick a target size or use the slider and set a minimum quality.
Optionally set max width/height.
3
Process and download - individually or as a ZIP.
Frequently Asked Questions
What is ImageSize?
ImageSize is a lightweight, privacy-first web application for resizing and compressing images directly in your browser. It is designed to help users reduce image file sizes for sharing via email, social media, or other platforms where attachment size matters.
How does client-side processing work?
All image processing in ImageSize happens locally in your browser. Files never leave your device — they are not uploaded to any server — which preserves privacy and keeps your images secure.
Can I process multiple images at once?
Yes. ImageSize supports batch processing so you can upload many photos and apply the same size and quality constraints to all of them. The app recalculates per-image targets instantly and shows an estimate under each thumbnail so you can preview the results before downloading.
Are my images private?
Absolutely. Processing is done entirely in the browser; ImageSize does not upload or store your files on a server. This makes the app suitable for sensitive or personal photos where privacy is a concern.
Does ImageSize work on mobile?
Yes. The UI is responsive and works on modern mobile browsers. Because processing happens client-side, performance on low-end devices may vary based on available CPU and memory, but typical usage on recent phones works well for moderate batch sizes.
What formats are supported?
ImageSize supports common photographic formats such as JPEG and PNG. Processing PNGs can be less compressible than JPEGs depending on content (e.g., screenshots with large flat-color areas). Consider converting to JPEG if you need smaller photographic files.