Image Tool

Free Bulk Image Resizer — Resize Multiple Images at Once

Upload any number of images and resize them all in one go — by exact pixel dimensions or percentage. Lock aspect ratio, choose output format, set quality, and download everything as a ZIP.

  • Bulk Resize
  • Pixels or %
  • Lock Aspect Ratio
  • JPG / PNG / WEBP
  • Download as ZIP
  • 100% Private
  • No Signup
Features

Everything in One Image Resizer

Professional bulk resizing — built for designers, developers, and content creators.

Bulk Resize

Upload and resize dozens of images simultaneously with a single set of settings.

Pixels or Percentage

Set an exact pixel target (width × height) or scale all images by a percentage of their original size.

Lock Aspect Ratio

Keep images proportional — changing width auto-updates height, preventing stretching or squishing.

Don't Enlarge Option

Optionally prevent upscaling — images already smaller than the target keep their original dimensions.

Multiple Output Formats

Save resized images as JPG, PNG, or WEBP, or keep each image in its original format.

Adjustable Quality

Control JPG and WEBP compression quality from 10% to 100% to balance file size and sharpness.

Download as ZIP

Download all resized images in a single ZIP file with one click, or save images individually.

100% Private

All processing happens entirely in your browser using the Canvas API. Images never leave your device.

How It Works

Resize Images in 3 Simple Steps

1

Upload Your Images

Drag and drop any number of images onto the upload zone, or click to browse and select multiple files at once.

2

Choose Your Resize Settings

Pick pixel dimensions or a percentage, toggle aspect ratio lock, choose output format and quality, then click Resize Images.

3

Download Resized Images

Download all resized images at once as a ZIP file, or click the download button on any individual image card.

FAQ

Frequently Asked Questions

Yes. You can upload as many images as you want simultaneously by selecting multiple files or dragging a batch of images onto the upload zone. All images are resized with the same settings and you can download them all in a single ZIP file.

No. Every operation happens locally in your browser using the HTML5 Canvas API. Your images are never sent to any server, making this tool completely private and suitable for sensitive photos or confidential documents.

You can upload any format your browser can decode — JPG, PNG, WEBP, GIF, BMP, AVIF, and more. Resized images can be downloaded as JPG, PNG, WEBP, or in their original format.

When aspect ratio is locked, changing the width automatically recalculates the height (and vice versa) to maintain the original image proportions. This prevents distortion. When unlocked, you can set width and height independently to crop/stretch the image to custom proportions per pixel mode.

When this option is checked, images that are already smaller than the target size will not be upscaled — they stay at their original dimensions. Upscaling images reduces quality by introducing pixel interpolation, so this option is recommended when processing a mixed batch of different-sized images.

Click the Percentage tab in the settings panel. Enter a value — for example 50 to halve the dimensions, 75 to reduce to three-quarters, or 200 to double the size. The tool automatically calculates each image's output size based on its own original dimensions, so all images scale proportionally relative to themselves.

For web publishing, 80–85% provides an excellent balance between file size and visual quality. For archiving or printing, use 90–95%. PNG output is always lossless so the quality slider does not apply. WEBP at 80% is comparable to JPG at 90% with about 30% smaller file size.

Why Resize Images Online?

Whether you're preparing images for a website, social media, email campaign, or app, having the right image dimensions is critical. Oversized images slow down page load times and waste storage. Tools like this browser-based image resizer let you quickly and privately resize any number of images without installing software.

Resize by Pixels vs. Percentage

Pixel resizing is best when you need images to match a specific size — for example, a product thumbnail at exactly 800×800 px, or a banner at 1200×628 px for social sharing. Set the target width and height, and the tool will resize every image to those exact dimensions.

Percentage resizing is ideal when you want to scale all images proportionally to their own original sizes — for example, reducing a batch of photos to 50% for faster web delivery without targeting specific pixel counts.

Best Practices for Image Resizing

  • Always keep a backup of the original files before resizing.
  • Use PNG for graphics with transparency; JPG for photographs; WEBP for maximum compression with good quality.
  • Enable "Lock aspect ratio" unless you specifically need to stretch images to non-proportional dimensions.
  • Enable "Don't enlarge" when batch-processing a mixed set — it protects small images from being upscaled and degraded.
  • For web use, target widths around 1200–1600 px for hero images and 400–800 px for thumbnails.

Image Formats Explained

JPG — Best for photographs and complex images. Lossy compression; smaller files at lower quality settings. Widely supported everywhere. PNG — Lossless compression, supports transparency (alpha channel). Larger files but no quality degradation. Best for logos, screenshots, and UI assets. WEBP — Modern format developed by Google. Supports both lossy and lossless compression, and transparency. Typically 25–35% smaller than JPG at equivalent quality. Supported in all modern browsers.

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