About Image Resizer
This image resizer uses the browser Canvas API to resize images locally, supporting proportional scaling by width, height or percentage, with selectable output format (JPEG, PNG, WebP) and quality settings. All processing happens inside the browser — images are never uploaded to a server, so your privacy is protected. Whether you are generating website thumbnails, compressing assets for mobile, standardising social-media cover sizes, or adjusting photo resolution, it gets done quickly. The tool supports common formats (JPG, PNG, WebP, static GIF frames, BMP), offers live preview after resizing, and lets you download the result in one click. It is ideal for front-end development, operations design and content creation workflows.
How to Use
- Open the Image Resizer tool page
- Enter or paste your data into the input area
- View the real-time results and use the copy button to get the output
Use Cases
- Website Thumbnails — Scale high-resolution originals to specific dimensions to cut page payload and speed up first paint.
- Mobile Asset Compression — Reduce images by percentage or target size to save mobile bandwidth and fit different screen resolutions.
- Social Media Covers — Quickly crop and scale photos to the cover dimensions required by WeChat, Twitter, Facebook and other platforms.
- Uniform Product Images — Standardise product main-image resolution before listing on e-commerce to keep gallery pages tidy and consistent.
- Front-End Assets — Generate 1x/2x/3x multi-resolution icons or placeholders for responsive design and high-DPI screens.
FAQ
Which image formats are supported?
Inputs: JPG, PNG, WebP, BMP and static GIF frames. Outputs: JPEG, PNG or WebP — choose the best format for your use case.
Are images uploaded to a server?
No. All resizing uses the browser Canvas API locally; image data never leaves your device, so private images stay private.
Can it keep the original aspect ratio?
Yes. Proportional scaling locks the aspect ratio by default. You can also unlock it to freely set any width and height for stretching or cropping.
Does resizing reduce quality?
Resampling always occurs during resize; downscaling usually has minor impact. Choose lossless PNG or raise the JPEG/WebP quality to retain more detail.
Does it support batch processing?
This tool focuses on precise single-image adjustment with live preview. For batches, process images one by one or script the Canvas API for bulk generation.
What is the maximum image size?
Limited by browser Canvas memory, typically handling tens-of-megapixel images. For very large images, crop first then resize to avoid lag or crashes.
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