Image Resizer decodes selected images, applies the requested dimensions in Canvas, and produces downloadable image blobs without sending source pixels to a server. Essential for preparing thumbnails, social media crops, email attachments, and responsive images at exact pixel dimensions with full client-side control.
Image tools
Drop an image here or click Upload
Supports PNG, JPEG, GIF, WebP
output description
Image Resizer decodes selected images, applies the requested dimensions in Canvas, and produces downloadable image blobs without sending source pixels to a server.
Select an image, choose exact pixels or a percentage, decide whether to lock the aspect ratio, and inspect the decoded result before download.
Step 1
Click the upload button or drag and drop your images onto the tool. You can select one or multiple images for batch processing.
Step 2
Select whether you want to resize by specific dimensions (pixels), by percentage, or use a preset size template.
Step 3
Enter your desired width and height values. The aspect ratio lock ensures your images maintain their proportions unless you specifically unlock it.
Step 4
Review the preview of your resized image and check the estimated file size. Make adjustments if needed.
Step 5
Choose whether to keep the original format or convert to a different format like JPEG, PNG, or WebP.
Step 6
Click the download button to save your resized images. For batch processing, all images will be downloaded as a ZIP file.
Consequence: The parser cannot produce a trustworthy result.
Fix: Start with a known-good vector such as valid input.
Consequence: Readable or reversible data may be trusted incorrectly.
Fix: Local file processing avoids uploads, but generated files can still contain visible private information.
Consequence: Another system may reject or misinterpret the result.
Fix: Confirm the receiver follows MDN: Canvas API.
Consequence: Truncation, invalid syntax, or lossy changes can reach production.
Fix: Compare with reviewed local output and round-trip when possible.
Consequence: The tab may become slow or run out of memory.
Fix: Large images and files consume browser memory because source and result may coexist in the same tab.
Consequence: The saved result no longer represents the source.
Fix: Run again and review status before copying or downloading.
Image Resizer decodes selected images, applies the requested dimensions in Canvas, and produces downloadable image blobs without sending source pixels to a server.
Validate reviewed local output before another application uses it.
Move the reviewed result into a related local workflow.
This example verifies Image Resizer's primary behavior without uploading data.
The tool supports all common web image formats including JPEG, PNG, WebP, GIF, and BMP. You can resize any of these formats while maintaining the original format or converting to a different one.
The tool uses high-quality algorithms to minimize quality loss. When reducing dimensions, you can choose to maintain aspect ratio to prevent distortion. For most use cases, the quality difference is imperceptible.
Yes, the tool supports batch processing. You can upload multiple images and apply the same resize settings to all of them simultaneously, saving you time when working with multiple files.
The aspect ratio is locked by default. When you change one dimension, the other automatically adjusts proportionally. You can unlock the aspect ratio if you need to set custom dimensions.
Absolutely. You can enter exact pixel values for width and height. The tool also offers common preset sizes like social media dimensions, thumbnails, and standard resolutions.
Yes, you can resize by percentage instead of specific pixel dimensions. This is useful when you want to scale an image up or down by a specific factor while maintaining its proportions.
The tool handles images up to 50MB in size. For best performance with very large images, consider reducing the dimensions first before applying additional compression.
Yes, the tool shows a real-time preview of the resized image along with the estimated file size. This allows you to adjust settings before committing to the final result.
The tool preserves essential image metadata by default. You can choose to strip metadata if you need to reduce file size further or protect privacy information.
Yes, the tool is fully responsive and works on smartphones and tablets. The touch-friendly interface makes it easy to upload and resize images on any device.
Image Resizer processes input and produces output inside this browser. The tool does not upload tool data. Browser capabilities such as files, clipboard, camera, Canvas, Web Crypto, workers, or downloads are used only after the workflow or an explicit user action requires them.
