Top 10 Best Bulk Image Resizer For Windows and Mac In 2025

Managing high-resolution photos has become a modern challenge especially for photographers, bloggers, designers, and marketers who handle hundreds or even thousands of images daily. Whether you want to save disk space, speed up website loading times, or streamline editing, a bulk image resizer is the ultimate solution.

As of 2025, new AI-powered resizers are faster, more accurate, and preserve image quality better than older versions. Below, we’ll explore the top 10 bulk image resizers for Windows and Mac, along with expert insights, unique pros, and real-world use cases.

What Is a Bulk Image Resizer and Why You Need It

A bulk image resizer lets you resize multiple images at once automatically adjusting dimensions, file size, and formats. This saves enormous time compared to resizing each photo manually.

Key Benefits:

• Saves Time: Resize hundreds of photos simultaneously.

• Frees Storage Space: Reduces file size by up to 80% without quality loss.

• Boosts Website Speed: Smaller images load faster, improving SEO rankings.

• Maintains Quality: Most tools use compression algorithms that preserve sharpness and detail.

According to Google’s Core Web Vitals (2024), optimizing image size can improve page load speed by up to 40%, directly influencing user retention and search visibility.

How to Batch Resize a Folder of Pictures (Quick Guide)

For Windows users:

1. Select the image files you want to resize.

2. Right-click → choose Resize Pictures.

3. Select a predefined size or enter custom dimensions.

4. Click Resize, and your optimized images will be saved automatically.

For Mac users:

• You can use Preview or third-party apps like BatchPhoto and PhotoBulk to resize images by percentage, pixels, or resolution.

Features to Look for in a Bulk Image Resizer

When choosing the best image resizer, consider:

• Batch Processing Speed — How quickly can it process 100+ images?

• Supported Formats — JPEG, PNG, RAW, TIFF, etc.

• Quality Preservation — Does it reduce size without distortion?

• Automation — Custom presets, rename options, and folder monitoring.

• Cross-Platform Support — Works on both Windows and macOS.

Top 10 Bulk Image Resizers for Windows and Mac (2025 Edition)

Below is a mix of free, premium, and AI-powered image resizers that deliver the best balance between performance, quality, and usability.

1. GIMP (Free, Windows/Mac/Linux)

Best for: Professionals who want free, open-source image editing and resizing.

GIMP remains one of the most powerful free photo editors in 2025. Its batch resize plugin and cross-platform compatibility make it ideal for bulk processing.

Highlights:

• No quality loss resizing.

• Supports JPEG, PNG, TIFF, and RAW.

• Integrates with Python-based automation scripts.

2. FastStone Photo Resizer (Windows)

Best for: Quick and reliable bulk conversions with rename and watermark features.

FastStone’s intuitive interface lets users resize, rename, and convert large collections in just a few clicks. It supports 20+ formats and can even apply effects like color correction and rotation during resizing.

Key Features:

• Batch rename and resize.

• Format conversion support (JPEG, PNG, WebP).

• Preset templates for repetitive tasks.

3. PhotoSize (Web-Based Tool)

Best for: Users who prefer not to install software.

PhotoSize is a browser-based image resizer that works directly online. Perfect for quick resizing from any device.

Features:

• Resize multiple images simultaneously.

• Supports JPEG, PNG, TIFF, PSD, and GIF.

• Allows cropping, rotating, and exporting in bulk.

4. BatchPhoto (Windows/Mac)

Best for: Power users who handle hundreds of high-resolution photos daily.

BatchPhoto automates your photo resizing workflow using preset profiles. You can also watermark, crop, or apply filters while resizing.

Advanced Tools:

• Resize by pixel, percent, or DPI.

• Supports RAW formats from Canon, Nikon, Sony, etc.

• Can add timestamps, effects, and logos automatically.

5. Bricelam Image Resizer (Windows)

Best for: Lightweight, simple resizing with minimal setup.

Built for speed and simplicity, this Windows tool integrates directly into File Explorer. Perfect for office users and casual photographers.

Pros:

• Fast batch resizing with right-click menu.

• Custom DPI and quality options.

• Works with older Windows versions too.

6. XnConvert (Windows/Mac/Linux)

Best for: Multi-format users who need flexibility.

XnConvert supports over 500 image formats and lets you chain multiple actions crop, adjust contrast, rotate, watermark in a single batch process.

Key Strengths:

• Extremely customizable workflows.

• Metadata editing and preview options.

• Available in 20+ languages.

7. PicPick (Windows)

Best for: Bloggers and content creators.

Though primarily a screenshot tool, PicPick doubles as a capable batch resizer with image effects like frames, drop shadows, and brightness adjustment.

Highlights:

• Lightweight and free.

• Supports hotkey automation.

• Includes markup tools for quick edits.

8. AlpacaSoft Image Enlarger (Android/iOS)

Best for: Mobile users needing quick image enlargement.

While not a batch resizer, AlpacaSoft’s app uses AI algorithms to upscale photos with minimal blur. It’s perfect for social media users who want sharper enlargements without losing detail.

Pros:

• Simple mobile interface.

• Maintains image clarity up to 4x enlargement.

• Free with optional premium export quality.

9. JPEGmini (Windows/Mac)

Best for: Reducing JPEG size without any quality compromise.

JPEGmini is designed for photographers and website owners who prioritize speed and image fidelity. It automatically compresses images up to 80% smaller while maintaining identical visual quality.

Key Features:

• One-click drag-and-drop optimization.

• Lightroom and Photoshop plugins available.

• Real-time compression preview.

10. ACDSee Photo Studio Ultimate (Windows/Mac)

Best for: Professionals managing large media libraries.

This full-featured suite combines powerful editing tools with bulk processing. Resize, rename, and optimize hundreds of images from its “Manage Mode.”

Highlights:

• Supports layered editing and RAW processing.

• Resize by pixel, print size, or percentage.

• Includes AI subject selection and tone correction.

Quick Comparison Table

People Also Ask

Q1: What’s the best free bulk image resizer for 2025?
→ GIMP and XnConvert remain the top free choices. They offer advanced editing and script-based automation without watermarks.

Q2: How do I resize multiple images for a website without losing quality?
→ Use JPEGmini or FastStone with a compression setting between 80–90% to retain clarity and fast load times.

Q3: Is there an AI image resizer that improves image quality?
→ Yes, tools like Let’s Enhance and HitPaw Photo Enhancer (2025) use AI upscaling that sharpens details while reducing size.

Visual Content Ideas for This Article

• Infographic: Comparison chart of speed and quality among top resizers.

• Workflow Diagram: Step-by-step process for batch resizing.

• Before/After Image Chart: File size reduction comparison (e.g., JPEGmini vs XnConvert).

• Tip Card Visual: “5 Mistakes to Avoid When Batch Resizing Images.”

Final Thoughts

As image-heavy platforms dominate digital content, bulk image resizers are now essential for professionals and everyday users alike. The right tool can dramatically cut down editing time, improve web performance, and preserve image quality.

If you’re after speed and automation, go with BatchPhoto or XnConvert.
If you need AI-level optimization, try JPEGmini or Let’s Enhance.
For free all-rounders, GIMP remains unbeatable in 2025.