Image Resizer Online – Resize Images Instantly Without Losing Quality

Free Online Tool

Image Resizer

Resize images to custom dimensions, predefined sizes, or by percentage — all in your browser. Supports bulk resizing with aspect ratio lock and ZIP download.

100% Client-Side Instant Resize No Upload Bulk Support

All image resizing is performed entirely in your browser using HTML5 Canvas. No files are uploaded or stored on any server.

Upload Images

Drag & Drop Images Here

or click to browse · JPG, PNG, WebP, GIF · Up to 50 images

0 images selected
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Resize Settings

Resize Mode Custom Dimensions By Percentage Predefined Size

Output Format PNG (Lossless) JPEG (Lossy) WebP (Modern)

Width (px)

Height (px)

Maintain Aspect Ratio

Based on first image

Resize Percentage: 100%

10%200%

Aspect ratio is always maintained in percentage mode. Each image scales based on its own original dimensions.

Preset Size Thumbnail (150 × 150) Small (320 × 240) Medium (800 × 600) Large (1280 × 960) Full HD (1920 × 1080) Instagram Post (1080 × 1080) Facebook Cover (820 × 312) Instagram Story (1080 × 1920) YouTube Thumbnail (1280 × 720) Twitter Header (1500 × 500)

Images are fitted within the selected dimensions while maintaining their aspect ratio. Images smaller than the target are not upscaled.

Quality: 90%

10% (small file)100% (best quality)

Loading ZIP library for bulk download, please wait...

Resizing Images

0%

Initializing...

All images resized successfully!

Resized Images

How To Resize Images

1

Upload One or Multiple Images

Drag and drop images into the upload area, or click to browse. You can select up to 50 images at once. Supports JPG, PNG, WebP, and GIF formats.

2

Choose Resize Mode and Settings

Pick Custom Dimensions (with optional aspect ratio lock), By Percentage (slider from 10% to 200%), or a Predefined Size (Instagram, YouTube, Full HD, etc.). Select output format and quality.

3

Enable Aspect Ratio If Needed

When "Maintain Aspect Ratio" is on in custom mode, enter either width or height — the other is calculated automatically per image. In percentage and predefined modes, aspect ratio is always preserved.

4

Click Resize Images

Hit the resize button to process all uploaded images. A progress bar shows the status. Each image is resized using HTML5 Canvas entirely in your browser — no data leaves your device.

5

Download Resized Images

Preview each resized image with original vs new dimensions and file size. Download individual images or click "Download All as ZIP" to get a single ZIP file containing all resized images.

Frequently Asked Questions

An Image Resizer changes the dimensions of an image — making it larger or smaller. This tool uses your browser's HTML5 Canvas to resize images without uploading them to any server, keeping your photos completely private.

Yes, completely free with no limits, no watermarks, no sign-ups, and no hidden charges. Resize as many images as you need.

You can upload JPG/JPEG, PNG, WebP, and GIF images. For output, you can choose PNG (lossless, larger files), JPEG (lossy, smaller files with quality control), or WebP (modern format with excellent compression).

Aspect ratio is the proportional relationship between width and height. Maintaining it ensures your image doesn't get stretched or distorted. For example, a 4000×3000 photo resized to 800px wide will automatically become 600px tall, keeping the same proportions.

Select multiple images at once (up to 50). All images are resized using the same settings. In custom mode with aspect ratio on, each image's height is calculated from its own original proportions. You can preview all results and download them individually or as a ZIP file.

Downscaling (making smaller) generally preserves quality well, especially with PNG output. JPEG and WebP use lossy compression — lower quality settings produce smaller files but may show artifacts. Upscaling (making larger) will reduce perceived quality since new pixels are estimated. For best quality, use PNG format and avoid upscaling.

Predefined sizes are common dimensions used for social media, web, and print. Examples include Instagram Post (1080×1080), YouTube Thumbnail (1280×720), Facebook Cover (820×312), and Full HD (1920×1080). Images are fitted within these dimensions while maintaining their aspect ratio.

Absolutely. Your images never leave your device. All resizing happens locally in your browser using the Canvas API. No files are uploaded, nothing is stored on any server. Close the tab and everything is gone from memory.

You can resize up to 50 images in a single batch. Very large images (e.g., 8000×6000 from DSLR cameras) may take longer to process. If your browser runs out of memory, try fewer images at a time.

Yes, the tool is fully responsive. You can select images from your photo library, configure settings, resize, preview results, and download — all from a mobile browser. The image grid adapts from 3 columns on desktop to single column on mobile.

Resize images instantly — fast, secure, and 100% client-side.

Image Resizer Online · Resize Images Free · Bulk Image Resizer · Photo Resize Tool · Resize JPG PNG Online