How do I resize an image with the img-tools resizer?

Drag and drop your JPEG, PNG, WebP, or AVIF image onto the Image Resize page, or paste it with Ctrl+V / Cmd+V. Choose "Pixels" to set an exact width and height or "Percent" to scale (e.g. 50% to halve), keep aspect-ratio lock on to avoid distortion, then click Apply Resize to preview and Export / Download to save as JPEG, PNG, or WebP. It is completely free and runs entirely in your browser via the Canvas API, so your image is never uploaded.

Are images uploaded to a server?

No. All resizing runs entirely in your browser; images never leave your device.

Is the Image Resize tool free?

Yes — resizing images by exact pixels or percentage (with aspect-ratio lock) is completely free, forever. No account, no sign-up, and no limit on how many images you resize. All resizing uses the Canvas API with bicubic interpolation in your browser; your images are never sent to any server. The site is ad-supported.

Does it work offline?

Yes. The tool uses the Canvas 2D API for resizing and requires no server connection. Disconnect after loading and it still works.

What image formats are supported?

Input: JPEG, PNG, WebP, AVIF (browser-decoded). Output: JPEG, PNG, WebP.

Does resizing reduce image quality?

The tool uses high-quality bicubic interpolation (imageSmoothingQuality = "high"), the best scaling available in the browser Canvas API. Upscaling well beyond original resolution will produce some blurring — this is a fundamental property of raster images, not a tool limitation.

What does aspect-ratio lock mean?

When enabled, changing the width automatically recalculates the height to preserve original proportions, and vice versa — preventing stretching or squashing.

Is there a maximum size limit?

No artificial limit. The practical maximum is the browser Canvas size limit (typically 16,384×16,384 px) and your device's available memory.

How does percentage mode work?

Enter 50 to halve the original dimensions, 200 to double them. The default is 100% (no change).

Image Resize

Resize Image is a free browser-based tool that changes JPEG, PNG, and WebP dimensions by exact pixel values or a percentage scale, with optional aspect-ratio lock to prevent distortion. High-quality bicubic interpolation is applied via the Canvas API entirely on your device — no upload required, no account, works offline.

Resize images by pixels or percentage, right in your browser — free, no upload required.

100% Free — Forever. No fees, ever.
Private: files are processed locally in your browser and never sent to a server.
No upload, no account, no sign-up.

Open the tool
Go to the Image Resize page. No sign-up, no installation, no upload required.
Load your image
Drag and drop an image onto the upload zone, click to browse, or paste with Ctrl+V / Cmd+V. JPEG, PNG, WebP, AVIF, and more are supported.
Choose resize mode
Switch between "Pixels" to set an exact width/height in pixels, or "Percent" to scale relative to the original size (e.g. 50% to halve dimensions).
Set dimensions
Enter your target width and height. With aspect-ratio lock on (default), changing one field automatically calculates the other to preserve proportions.
Click Apply Resize
A live preview updates instantly showing the resized result and the new dimensions.
Export and Download
Click Export / Download, pick your output format (JPEG, PNG, or WebP) and quality, then download your resized image directly to your device.

How do I resize an image with the img-tools resizer?: Drag and drop your JPEG, PNG, WebP, or AVIF image onto the Image Resize page, or paste it with Ctrl+V / Cmd+V. Choose "Pixels" to set an exact width and height or "Percent" to scale (e.g. 50% to halve), keep aspect-ratio lock on to avoid distortion, then click Apply Resize to preview and Export / Download to save as JPEG, PNG, or WebP. It is completely free and runs entirely in your browser via the Canvas API, so your image is never uploaded.
Are images uploaded to a server?: No. All resizing runs entirely in your browser; images never leave your device.
Is the Image Resize tool free?: Yes — resizing images by exact pixels or percentage (with aspect-ratio lock) is completely free, forever. No account, no sign-up, and no limit on how many images you resize. All resizing uses the Canvas API with bicubic interpolation in your browser; your images are never sent to any server. The site is ad-supported.
Does it work offline?: Yes. The tool uses the Canvas 2D API for resizing and requires no server connection. Disconnect after loading and it still works.
What image formats are supported?: Input: JPEG, PNG, WebP, AVIF (browser-decoded). Output: JPEG, PNG, WebP.
Does resizing reduce image quality?: The tool uses high-quality bicubic interpolation (imageSmoothingQuality = "high"), the best scaling available in the browser Canvas API. Upscaling well beyond original resolution will produce some blurring — this is a fundamental property of raster images, not a tool limitation.
What does aspect-ratio lock mean?: When enabled, changing the width automatically recalculates the height to preserve original proportions, and vice versa — preventing stretching or squashing.
Is there a maximum size limit?: No artificial limit. The practical maximum is the browser Canvas size limit (typically 16,384×16,384 px) and your device's available memory.
How does percentage mode work?: Enter 50 to halve the original dimensions, 200 to double them. The default is 100% (no change).

The Canvas 2D drawImage() method uses high-quality bicubic or bilinear interpolation when imageSmoothingQuality="high" — specified in the W3C HTML Living Standard.
Image resizing is one of the most common image pre-processing operations, widely used for web performance optimization, social media dimension requirements, and print preparation.
WebP achieves 25–35% smaller files than JPEG at equivalent visual quality — source: Google WebP study (developers.google.com/speed/webp/docs/webp_study). Ideal for resized thumbnail output.
Client-side processing eliminates network latency, making browser-based resizing typically 10× faster than cloud services for typical file sizes, with full privacy protection.
Most major browsers (Chrome, Firefox, Safari, Edge) support Canvas sizes up to 16,384×16,384 px; actual usable limits depend on device memory.

📐 Image Resize

Image Resize