[Online Tool] Resize Images Online — Change Pixel Dimensions with Proportional Scaling, No Distortion

"Upload failed — file dimensions exceed the limit."

"Image too large to send."

"I need a 100×100 pixel avatar, but my photo is 4032×3024."

Almost everyone has hit one of these. The old solution was Photoshop or hunting for an app. Toolshu's Image Resizer lets you upload a photo, enter your target dimensions, and download the resized result in one click — all processed locally in your browser, nothing sent to a server.

🔗 Tool URL: https://toolshu.com/en/imgresize

Three Steps, Done

Step 1: Click to upload, or drag your image file directly into the tool. Supports JPEG, PNG, ICO, and other common formats. Transparent PNG files retain their transparency channel after resizing.

Step 2: Enter your target width or height in pixels. With "Keep aspect ratio" checked, you only need to fill in one dimension — the other is calculated automatically to match the original proportions, with no stretching or squashing. To force an exact size (such as fixed dimensions required for an ID photo), fill in both values.

Step 3: Click "Resize," preview the result, and download. The whole process runs in your browser — no network wait time, no watermark.

Proportional Scaling vs. Forced Dimensions — Which to Choose?

This is the most common decision when resizing images.

Proportional scaling: Check "Keep aspect ratio" and fill in only the width or height. The tool calculates the other side automatically, ensuring no stretching or compression. The right choice for most everyday scenarios — social posts, email attachments, web display.

Forced dimensions: Fill in both values and uncheck "Keep aspect ratio." The image will be stretched to exactly the target width and height. Appropriate when strict size requirements apply — ID photos, avatar uploads, e-commerce image specs. If the original and target aspect ratios differ significantly, forced stretching will visibly distort the image. In that case, use the Image Cropper to trim to the correct ratio first, then resize.

Common Image Size Reference by Platform

A quick reference for frequently needed dimensions:

WeChat profile photo: 200×200 px, square.

WeChat public account cover: Main image 900×383 px; secondary image 200×200 px.

Weibo profile photo: 180×180 px.

Taobao / Tmall product main image: 800×800 px, square, max 3 MB.

ID / passport photos (online applications): Requirements vary by platform. Common sizes include 295×413 px (standard 2-inch photo) and 192×144 px — always check the specific platform's requirements.

Images embedded in PowerPoint: Compress to 1280×720 or 1920×1080 to significantly reduce overall file size.

Website banners: Common sizes include 1200×400 and 1920×600 — check your specific template's requirements.

ICO Format Support

One detail worth calling out: the tool supports ICO as an output format.

ICO is the standard format for Windows application icons and website favicons. If you need to resize a PNG to a 32×32 or 16×16 pixel ICO icon, this tool handles it directly — no need for a separate ICO converter.

If you need a proper multi-size favicon.ico bundling 16×16, 32×32, 64×64, and other sizes together, Toolshu's dedicated ICO Icon Generator is better suited: https://toolshu.com/en/ico

How Is This Different from the Image Cropper?

"Resize" and "crop" are two distinct operations that often get confused:

Resize: Changes the pixel dimensions of the image while keeping the entire picture intact — just larger or smaller. Like enlarging or reducing a photo print.

Crop: Selects a region of the image and discards everything outside it. Like cutting the edges off a photo with scissors.

To turn a landscape photo into a square avatar, you typically crop first (select the center square) then resize (scale to the target dimensions). The two tools work well together: Image Cropper at https://toolshu.com/en/image-cropper, Image Resizer at https://toolshu.com/en/imgresize.

Privacy

All processing runs locally in your browser — your images are never uploaded to any server. Safe to use with ID photos, contract screenshots, and any other sensitive content.

👉 Resize your image now: https://toolshu.com/en/imgresize

Toolshu Online Tools — toolshu.com — resizing images shouldn't require installing software. Open and go.