Image Resizer – Resize Any Image Online for Free
Resize your images to exact pixel dimensions or scale by percentage. Lock the aspect ratio to avoid distortion, choose your output format (JPG, PNG, or WebP), and download the result instantly. All processing happens in your browser — your images are never uploaded to any server.
Upload Image
Drag & Drop an image here or click to browse
Your image stays on your device — never uploaded anywhere.
Resized Preview
Resized image preview will appear here.
Why Use the Tools Oasis Image Resizer?
Tools Oasis lets you resize any image quickly and privately, right in your browser. Whether you need to scale down a photo for a website, resize an image for social media, or bulk-adjust dimensions for email — this tool handles it in seconds with no quality compromises.
- 100% Private: Your images never leave your device. All resizing uses the HTML5 Canvas API locally.
- Aspect Ratio Lock: Prevent distortion by maintaining the original proportions automatically.
- Multiple Formats: Export as JPG, PNG, or WebP with adjustable quality settings.
- Instant Preview: See the resized result before downloading — no guesswork needed.
- Pixel or Percentage: Resize by exact pixel values or scale by percentage (1%-500%).
How to Resize Images Online
Using this tool is simple: drag and drop your image (or click to browse), set your desired width and height in pixels — or choose a percentage scale. Toggle the aspect ratio lock to keep proportions, select your output format, and click Resize Image. Preview the result and download it instantly.
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Frequently Asked Questions
What image formats are supported for upload?
You can upload any image format your browser supports — including JPG, PNG, WebP, GIF, BMP, and SVG. The tool uses the HTML5 Canvas API, so if your browser can display it, Tools Oasis can resize it.
Are my images uploaded to a server?
No. All image processing happens entirely in your browser using the Canvas API. Your images are never uploaded, stored, or transmitted to any server. It's 100% private.
What does the aspect ratio lock do?
When the lock is enabled (the default), changing the width automatically adjusts the height proportionally — and vice versa. This prevents your image from being stretched or squished.
Can I upscale images with this tool?
Yes. You can scale images up to 500% or enter pixel dimensions larger than the original. Keep in mind that upscaling a raster image beyond its original size may reduce sharpness, as no new detail is created.
What output formats can I choose?
You can export your resized image as JPG, PNG, or WebP. JPG and WebP support quality adjustment (10-100%), while PNG is always lossless.
Is there a file size limit?
There's no hard limit, but very large images (above 50 megapixels) may be slower to process since everything runs in your browser. For typical photos and web images, performance is instant.
More About Image Resizing
Can I resize an image without losing quality?
Downscaling an image generally preserves visual quality well. Upscaling beyond the original dimensions may reduce sharpness since no new detail is created. For best results, export as PNG (lossless) or use a high JPG/WebP quality setting.
Can I set exact width and height dimensions?
Yes. You can enter precise pixel values for both width and height. With the aspect ratio lock enabled, changing one dimension automatically adjusts the other to prevent distortion. You can also scale by percentage from 1% to 500%.
What image formats are supported?
You can upload any image format your browser supports — including JPG, PNG, WebP, GIF, BMP, and SVG. For output, you can choose between JPG, PNG, or WebP with adjustable quality settings.
Does the image resizer support cropping?
This tool focuses on resizing by dimension or percentage. For cropping, you can unlock the aspect ratio and set custom width and height values to achieve a different proportion, then resize. The preview lets you verify the result before downloading.