Free Online Image Resizer
Resize images to any dimension. Presets for social media. Aspect ratio lock. Batch support. All processing in your browser.
Drag and drop files here
or
How to Resize Images
- Upload one or more images
- Choose a preset or enter custom width and height
- Select output format and quality
- Read the real output size, then download files individually or once as a ZIP
Features
- Presets for Instagram, Facebook, Twitter, YouTube
- Custom width and height
- Maintain aspect ratio option
- Output as JPG, PNG, or WebP
- Batch resize with one ZIP download
- Selected image contents are processed locally in your browser
Practical limits
Browser processing safeguards
These are ToolkitFree screening thresholds, not promises that every browser can reach them.
| Safeguard | Desktop | Mobile |
|---|---|---|
| Single-image hard cap | 100 MP | 100 MP; the 80 MP total cap can block first |
| Batch size warning | 20 files | 10 files |
| Batch size block | 50 files | 25 files |
| Encoded input warning | 100 MiB | 40 MiB |
| Encoded input block | 250 MiB | 100 MiB |
| Total pixels warning | 80 MP | 32 MP |
| Total pixels block | 200 MP | 80 MP |
| Working memory warning | 512 MiB | 192 MiB |
| Working memory block | 1 GiB | 384 MiB |
| Parallel processing | Up to 2 images | Up to 2 images |
Large dimensions can exhaust browser memory before encoded file size looks large. ToolkitFree checks dimensions and estimated working memory before processing.
Frequently Asked Questions
How do I resize an image?
Choose your image, then pick a common size, a platform preset, or your own numbers. The result is prepared as you change the settings, so you can read the real output size before you download it.
What presets are available?
We offer presets for Instagram Post, Instagram Story, Facebook Cover, Twitter/X Header, YouTube Thumbnail, Full HD, HD, and Thumbnail sizes.
What does "maintain aspect ratio" do?
When enabled, the tool automatically adjusts one dimension to match the original image's proportions. This prevents your image from appearing stretched or squished.
Can I resize multiple images at once?
Yes, you can upload and resize multiple images simultaneously. All images will be resized to the same dimensions.
Can I download all resized images at once?
Yes. Use Download all as ZIP for a single browser download containing every successful result. You can still download files one by one, while failed inputs remain listed separately.
What output formats are supported?
You can save resized images as JPG, PNG, or WebP. PNG supports transparency; JPG and WebP provide adjustable quality. Compare outputs for your use case.
How do I resize a photo for Instagram?
Choose your photo and select the Instagram Post preset (1080x1080); the result appears without a further step. For Stories or Reels, choose the Instagram Story preset (1080x1920). Fixed presets use their exact dimensions; crop the image first if you do not want it stretched.
How do I crop an image to a specific size?
Enter your desired width and height, and disable "Maintain aspect ratio" if you want exact dimensions rather than a bounding box. The result updates as you type.
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