Bulk Image Resizer

Resize, scale, and optimize your images in batches. Zero uploads. Complete privacy.

🖼️

Drag & drop images or browse files

Supports JPG, PNG, WEBP

Processing images in your browser memory...

What is the Bulk Image Resizer?

The Bulk Image Resizer is a client-side image editing utility designed to scale multiple images to specific dimensions at the same time. By setting pixel boundaries or scale percentages, users can process large collections of graphics, photos, or screenshots locally in their browser.

This utility processes all file loads, aspect ratios, canvas resampling actions, and ZIP packaging in temporary memory. Your original graphics, photos, and resized files remain private on your computer, never leaving your local workspace.

How to Use the Bulk Image Resizer

  1. Load Your Files: Drag and drop your images into the dotted drop zone, or click to select files from your folders.
  2. Choose Scale Mode: Select "Custom Dimensions" (for target pixels) or "Scale Percentage" from the resize mode selector.
  3. Define Settings: Input your target width and height values, or adjust the scale percentage slider. Check "Maintain Aspect Ratio" to prevent distortion.
  4. Choose Format: Select your preferred output format (JPEG, PNG, or WebP) from the format selector.
  5. Download Your Batch: Click the "Resize Images & Download ZIP" button. The tool resizes the files locally and triggers a ZIP download.

Key Features

  • Dual Resizing Modes: Scale precisely using custom pixel inputs or quickly using percentage sliders.
  • Proportional Aspect Locking: Automatically calculates dimensions to keep your images from looking stretched.
  • Interactive Preview Grid: Shows a thumbnail grid of selected files to review before processing.
  • Bilinear Canvas Resampling: Implements standard canvas rendering logic to keep resized outputs sharp.
  • Client-Side ZIP Bundling: Packages all scaled images into a single structured ZIP file for convenience.

Common Use Cases

  • Email Attachments Optimization: Scale down huge smartphone camera photos before sending them as attachments.
  • E-commerce Inventory Setup: Format batches of product images to standard dimensions for online storefronts.
  • Blog Banner Scaling: Match mockups and photos to standard header width guidelines for blog layouts.
  • Offline Asset Structuring: Format assets during travel or fieldwork without needing internet connections.

Frequently Asked Questions

No. When "Maintain Aspect Ratio" is checked, changing the width input automatically recalculates the height proportionally, keeping your image shape intact.

Yes. You can choose to convert your resized images to JPEG, PNG, or WebP formats using the output format selector dropdown.

No. Your images are loaded, resized, and packaged locally on your device. 99tool.in does not store, collect, or share your proprietary visual assets.

There is no strict count limit. Since the resizer uses your system's memory, processing very large batches of high-resolution images depends on your hardware capabilities.

🔒 Privacy & Data Note: File selection lists, canvas resizing tasks, and ZIP compilation are processed locally in your browser. No files are stored or uploaded.