Resize Image Online Free
Change image dimensions to any size. Use presets or enter custom width and height. No uploads required.
Drop your image here
or click to browse · JPG, PNG, WEBP supported
What is Image Resizing?
Image resizing changes the pixel dimensions of an image — its width and height. This is one of the most fundamental image editing operations, needed for countless everyday tasks: preparing images for social media, reducing file size, creating thumbnails, or making images fit specific dimensions required by a platform or application.
Toolify resizes images instantly in your browser using the Canvas API. Enter any custom dimensions, or choose from our presets for common platforms like Instagram, Twitter, and YouTube. The aspect ratio lock ensures your image doesn't get stretched or distorted.
Standard Image Sizes for Social Media
- Instagram post: 1080×1080px (square), 1080×1350px (portrait)
- Twitter/X post: 1200×675px landscape
- YouTube thumbnail: 1280×720px (HD)
- Facebook cover: 820×312px
- LinkedIn banner: 1584×396px
- Website hero image: 1920×1080px (Full HD)
Privacy & How It Works
All image resizing happens locally in your browser — your images never leave your device. This means no waiting for uploads, no privacy concerns, and instant results regardless of your internet connection speed. The tool uses the same Canvas API that powers professional web-based image editors.
How to Resize an Image — Step by Step
Upload Image
Drop your image or browse files
Choose Size
Use a preset or enter custom dimensions
Select Format
Choose JPG, WEBP or PNG
Download
Preview and save your resized image
Frequently Asked Questions
Does resizing an image reduce its quality?↓
Reducing an image size (downscaling) has minimal quality impact and is generally safe. Increasing size (upscaling) can reduce sharpness since the tool needs to create new pixels. For best results, always start with the highest resolution original.
What is aspect ratio lock and when should I use it?↓
Aspect ratio lock keeps the width-to-height ratio constant as you change dimensions. This prevents your image from looking stretched or squashed. Unlock it only when you need a specific size that doesn't match the original proportions, such as a social media banner.
What image formats are supported?↓
You can upload JPG, PNG, WEBP, and most common image formats. You can also choose the output format — JPG for smallest file size, WEBP for best web performance, or PNG for lossless quality.
Is my image uploaded to your servers?↓
No. All resizing happens locally in your browser using the Canvas API. Your image never leaves your device, ensuring complete privacy and instant processing with no upload wait time.
What size should I use for Instagram, Twitter, or YouTube?↓
Instagram posts: 1080x1080px (square). Twitter header: 1500x500px. YouTube thumbnail: 1280x720px. Facebook cover: 820x312px. Use our presets for common sizes or enter custom dimensions for your specific platform.
Can I resize multiple images at once?↓
Currently, images are processed one at a time. Batch resizing is coming soon as a Pro feature. You can quickly resize multiple images by using the New button after each one.
🔒 Your files never leave your device · Processed with Canvas API