Bulk Image Optimizer
Professional-grade bulk image resizing, cropping, and compression. 100% private, browser-side processing for high-speed workflows.
Configuration
Bulk Upload
Select up to 20 images. We support professional JPG, PNG, and WebP formats.
Why Use Master Resize
Engineered for professional content creators and developers.
Bulk Engine
Process dozens of images simultaneously with zero server wait times. 100% local, 100% fast.
Privacy Shield
Your data stays on your device. We never see your images. Perfect for sensitive documents and private assets.
Instant Export
Download everything at once in a neatly packaged ZIP archive, ready for your next project.
F.A.Q
Everything you need to know about our image processing.
Will resizing reduce my image quality?
We use high-quality canvas interpolation algorithms to maintain maximum clarity. You can also manually adjust the JPEG/WebP quality slider (1-100%) to balance file size and visual fidelity.
Is there a limit on the number of images?
You can upload up to 20 images at once for bulk processing. All processing happens locally in your browser, so the speed depends on your device's performance.
What is 'Fit Mode'?
Fit mode determines how your image behaves if its aspect ratio differs from the target size. 'Contain' keeps the whole image visible, 'Cover' crops it to fill the space, and 'Pad' adds a colored background.
Is my data secure?
Yes. Our tool is 100% client-side. Your images are never uploaded to any server; all resizing and compression happen directly within your browser's memory.