Choose an Image
Select the file you want to resize image online. The image loads locally in your browser for a private resizing workflow.
Image Resizer
Use this resize image online tool to change photo dimensions by width, height, or percentage while preserving aspect ratio. Resize images for websites, email, forms, and social platforms in your browser without uploading the original file.
Workspace
Use the tool below. Your inputs stay local when the tool supports browser-only processing.
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Click to upload an image
Supports PNG, JPEG, WebP
Last reviewed: · Testing methodology
Workflow
How to use the Image Resizer
Set New Dimensions
Enter a target width, height, or percentage and keep aspect ratio enabled when you want to avoid distortion. The resize image online preview helps confirm the result.
Download the Resized File
Export the resized image for websites, email, social media, or storage. The file is generated in your browser without uploading the original.
How this tool works
The browser decodes the selected image, draws it to a canvas at the requested dimensions, and exports a new local file.
- Engine: Canvas API decode, drawImage scaling, and export
- Supported input: browser-decodable images
- Output: the image formats offered in the UI
- Input
- 1600 x 900 image resized to width 800 with aspect ratio locked
- Output
- 800 x 450 image
Limits, edge cases, and troubleshooting
Use it to prepare web images, thumbnails, and profile assets. Keep aspect ratio enabled unless intentional stretching is required.
- Source and destination bitmaps must fit in browser memory.
- Upscaling cannot recreate lost detail; metadata, animation, and color profiles may not be preserved.
When to use another workflow
Use a desktop editor or CLI for batch resizing, sharpening, metadata preservation, color management, and repeatable presets.
| Option | Best for | Trade-off |
|---|---|---|
| This browser tool | Quick, private, one-off work | Limited by browser memory and the documented feature set |
| Desktop or command-line tool | Batch jobs and repeatable automation | Requires installation and setup |
Verification
Reviewed by the Free Online Tools Nest Team on 2026-08-26. The interface, output path, and documented limitations were checked against the current implementation. See our testing methodology for the review process.
Read the testing methodologyUnderstand your result
Image Resizer — Frequently Asked Questions
Can I resize image online without uploading?
Yes. This image resizer uses browser APIs to process the file locally, so your image is not sent to a remote server.
Will resizing reduce image quality?
Resizing can change quality depending on the output size and format. Keeping aspect ratio and choosing appropriate dimensions usually produces the best visual result.