Resize Image Online Free

Resize any image to exact pixel dimensions directly in your browser — lock aspect ratio, batch resize, and download instantly. Free, private, no upload.

Resize Images Free →Free · No signup · No upload

Need to resize a photo for your website, social media profile, or email signature? Resizor is a free online image resizer that lets you change image dimensions to any size you need — directly in your browser, with no software to install and no images uploaded to a server. Enter your target width and height, lock the aspect ratio to prevent distortion, and download your resized image in seconds.

Resizor uses WebAssembly (wasm-vips) with high-quality Lanczos resampling for sharp, accurate results when scaling images up or down. It supports JPEG, PNG, WebP, AVIF, and GIF as both input and output formats. After resizing you can also compress the image to further reduce file size. Batch resize is supported — upload multiple images and resize them all to the same dimensions at once.

How It Works

Upload Your Image

Select any image — JPEG, PNG, WebP, AVIF, GIF. Drag and drop or click to browse.

Enter Target Dimensions

Type your target width and/or height in pixels. Lock aspect ratio to scale proportionally.

Download Resized Image

Download your resized image in the original or a different format — JPEG, PNG, WebP, AVIF.

Why Choose Resizor?

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Private — No Upload

Your image stays on your device. Resizing runs in your browser via WebAssembly.

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Precise Dimensions

Enter exact pixel width and height, or resize by percentage. Aspect ratio lock prevents distortion.

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All Formats Supported

Resize JPEG, PNG, WebP, AVIF, and GIF. Export in a different format if needed.

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Free, No Watermark

Unlimited resizing — no account required, no watermarks, completely free.

Frequently Asked Questions

How do I resize an image without losing quality?

Downscaling an image (making it smaller) never loses quality — you're keeping all the information but in fewer pixels. Upscaling (enlarging) can introduce blurring if done too aggressively. Resizor uses high-quality Lanczos resampling to minimise artefacts when resizing.

What is the best image size for a website?

For full-width hero images: 1920×1080 or 1440×810. For blog content: 800–1200px wide. For thumbnails: 300–600px. For social sharing cards: 1200×630. Always compress after resizing to minimise file size.

Can I resize an image to a specific aspect ratio?

Yes. Resizor lets you lock the aspect ratio when resizing, or choose a specific ratio and it will calculate the matching dimension automatically.

What is the difference between resizing and cropping?

Resizing changes the image dimensions while keeping all the original content (which may stretch or squish it if you change the aspect ratio). Cropping removes parts of the image to achieve the target dimensions without distortion. Resizor offers both.

Can I resize multiple images at once?

Yes. Resizor's batch mode lets you resize multiple images to the same target dimensions in one step.

Resize Image Online Free — Start Now

100% free, runs in your browser. No signup required.

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