Image Resizer — Resize Photos by Pixels, Free, No Upload
Resize an image to exact pixels, a percentage or a longest side. Output JPG, PNG or WebP. Free, no upload, no watermark, no sign-up. Private in your browser.
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Resize images online — free, private, no upload required
Resizing images for different platforms — a website hero banner, a product photo at a specific pixel size, a profile picture, or a thumbnail — is one of the most common image tasks. Most online tools upload your image to a cloud server before processing. This resizer runs entirely in your browser using the HTML5 Canvas API, so your images are processed locally and never transmitted anywhere. There is no watermark, no sign-up and no daily limit.
Three resize modes
Exact px lets you specify width and height in pixels — useful for platform requirements like YouTube thumbnails (1280×720 px) or app icons (1024×1024 px). With the lock on, you type one side and the other follows the original shape; unlock it to type both, which stretches the picture to fit. Percentage scales the image while keeping its proportions: 50% halves both sides (a 4000×3000 photo becomes 2000×1500, a quarter of the pixels), and you can type up to 500%. Max side sets the longest side to a number you choose and keeps the proportions: 1080 turns a 4000×3000 photo into 1080×810, and also enlarges a smaller 800×600 image to 1080×810.
Common standard sizes for different platforms
Profile pictures: most platforms accept 400×400 px or larger and display them at smaller sizes. Blog featured images: 1200×630 px is the standard for Open Graph (link previews on Facebook and Twitter). E-commerce product images: 800×800 px or 1000×1000 px (square) is common for Shopify, WooCommerce, and Amazon. Email headers: 600 px wide is the industry standard maximum to avoid horizontal scrolling on most email clients. Print at 300 DPI: multiply inches by 300 — an A4 sheet at 300 DPI is 2480×3508 px.
Does resizing reduce image quality?
Resizing down (making an image smaller) has minimal quality impact when done correctly: large reductions are done in halving steps with high-quality smoothing, which keeps edges clean. Resizing up (upscaling) always introduces some softness because the tool must invent pixel values that don't exist in the source — for significant upscaling, dedicated AI upscaling tools produce sharper results, and the tool stops at 100 megapixels (a 12-megapixel photo can be enlarged to about 288%). The output defaults to JPEG at 90% quality; choose PNG for a lossless result, or WebP for smaller files. Only PNG keeps transparent areas: JPEG and WebP are flattened onto white.
What this tool does not do
It resizes one image at a time, so a folder of photos means repeating the steps for each. It never crops: to get exactly 1200×630 from a photo of a different shape, trim it to that shape first with the image cropper and then resize, or the picture will be stretched. It does not aim for a file size: after resizing, use the image compressor to reach a limit such as 100 KB. Halving both sides leaves a quarter of the pixels and usually a much smaller file, but the exact saving depends on the picture. The result is redrawn from pixels, so GPS location and camera details in the original are not copied, and nothing is uploaded: you can check that yourself. To turn the result into a PDF, use image to PDF.
Frequently asked questions
- Does resizing an image reduce quality?
- Making an image smaller keeps it looking clean, because the tool shrinks it in steps with high-quality smoothing. Making it larger cannot add detail, so it looks softer. The tool saves as JPEG at 90% quality by default; pick PNG for a lossless result, or raise the quality slider for JPEG and WebP.
- What is the maximum image size I can resize?
- The limit is 100 megapixels (for example 10,000 × 10,000 px), both for the image you open and for the size you ask for. Beyond that, browsers run out of memory, so the tool shows a message instead of failing silently. A 12-megapixel photo (4000 × 3000) can be enlarged to about 288% before it reaches the limit. Very large images can be slow on a phone.
- How do I keep the aspect ratio?
- In Exact px mode, leave the lock icon on: type a width and the height is worked out from the original shape. Percentage and Max side modes always keep the original proportions. Unlock the icon only if you want to stretch the picture to a specific width and height.
- How do I resize an image to exactly 1200 × 630 pixels?
- Use Exact px, unlock the aspect ratio, and type 1200 and 630. The tool stretches the image to those numbers and does not crop it, so a picture that is not the same shape will look squashed. Crop the image to the right shape first with the image cropper, then resize it. With the lock on, a 4000 × 3000 photo at width 1200 becomes 1200 × 900.
- Can I resize several images at once?
- No. The resizer works on one image at a time: open an image, set the size, download the result, then choose the next one. There is no batch mode, so for a whole folder repeat the steps for each image.
- Which output format should I choose?
- JPEG is the default and suits photographs. PNG is lossless and the only option that keeps transparent areas; JPEG and WebP outputs are flattened onto a white background. WebP gives smaller files than JPEG at similar quality, but some older software cannot open it. The quality slider applies to JPEG and WebP, not PNG.
- Will resizing make the file smaller?
- Usually, because fewer pixels need storing. Halving both sides leaves a quarter of the pixels (4000 × 3000 becomes 2000 × 1500, which is 12 million down to 3 million), and the file typically shrinks with it, though the exact saving depends on the picture and format. If you need a precise limit such as 100 KB, resize first, then use the image compressor.
- Can I make a small image bigger?
- Yes, but the result is only a smoothed enlargement; it will not gain detail. Percentage mode accepts up to 500%, and the Max side mode also enlarges: an 800 × 600 image with a longest side of 1080 becomes 1080 × 810. Both stop at the 100-megapixel limit.
- Is my image uploaded, and does it keep my location data?
- No upload: the image is resized in your browser using the Canvas API and never sent to a server. The result is redrawn from pixels, so information stored in the original file such as GPS location and camera details is not copied to the resized file. The downloaded file is named resized plus the format, for example resized.jpg.
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