How to resize an image online - free tool in your browser

Resizing product photos used to mean firing up Photoshop, waiting for it to load, and manually adjusting every file. That workflow is dead. Our free image resizer runs entirely inside your web browser - no software to install, no account to create, no files uploaded to any server. Drop your images, pick a marketplace preset, click download. Three steps, done.

The tool processes images locally using the Canvas API and Web Workers built into modern browsers. Your photos never leave your computer. You can verify this yourself: open the Network tab in your browser's developer tools while resizing - zero outbound requests. This matters especially for e-commerce sellers working with unreleased product shots or images under NDA.

Three steps to resize any image

1. Drop your images - drag files from your desktop or click to browse. You can select multiple images at once for batch processing. Accepted formats: JPEG, PNG, WebP, GIF.
2. Choose a preset or set custom dimensions - pick a platform preset (Amazon, eBay, Etsy, Shopify, Instagram and 28 more) or type your own width and height in pixels. Select the scaling strategy and output format.
3. Download - click the download button for each file or grab all resized images at once as a ZIP archive.

The entire process takes seconds. A batch of 50 product photos at 2000x2000 px finishes in under 30 seconds on a mid-range laptop. No watermarks, no file-count limits, no "premium tier" gates.

Image sizes for marketplaces - Amazon, eBay, Etsy requirements 2026

Every marketplace has its own image specifications. Upload a photo that falls outside the required dimensions and you risk suppressed listings, lost zoom functionality, or outright rejection. The table below summarizes the most important requirements for 2026. Our resizer includes built-in presets for every platform listed.

Amazon image requirements - why they matter

Amazon enforces a strict minimum of 1000 x 1000 pixels for the MAIN image. Fall below that threshold and your listing loses the zoom feature - customers cannot hover to enlarge the photo. According to Amazon's official image guidelines, the recommended size is 2000 x 2000 px with a pure white background (RGB 255, 255, 255). Amazon's algorithm checks background color automatically; a slightly off-white (#FAFAFA or similar) can trigger a listing suppression.

Our resizer's Amazon preset outputs exactly 2000 x 2000 px in JPEG format with adjustable compression. For white-background shots, a quality setting of 88-92% delivers visually lossless results at roughly a third of the uncompressed file size.

eBay and Etsy - key differences

eBay requires a minimum of 500 x 500 px but recommends 1600 px on the longest side. Listings with high-resolution images receive more visibility in search results. Etsy, on the other hand, recently raised its recommended minimum to 2000 x 2000 px and favors a 4:3 aspect ratio for listing thumbnails. Sellers who shoot at 3:2 (standard DSLR ratio) should crop or pad to 4:3 before uploading to Etsy to avoid unexpected cropping in search grids.

Image compression without losing quality

Resizing and compression are two different operations, but they work together. Resizing changes the pixel dimensions - for example, from 4000 x 3000 down to 2000 x 2000. Compression reduces the file weight (KB/MB) without necessarily changing the dimensions. Our tool performs both simultaneously.

The quality slider explained

The quality slider controls JPEG compression on a scale from 0% (maximum compression, smallest file, worst quality) to 100% (minimal compression, largest file, best quality). For product photography, the sweet spot is 85-92%. At 90%, a 2000 x 2000 JPEG product photo typically weighs between 200-400 KB - well within every marketplace's file size limit. At 100%, the same image might be 1.5-3 MB with virtually no visible improvement.

If you need transparency (cutout products on transparent backgrounds), switch the output format to PNG. PNG files are lossless but significantly larger. For web use where transparency is not required, JPEG is almost always the better choice for packshot photography.

JPEG vs PNG vs WebP - which format to choose

• JPEG - best for photos with continuous tones (product photography, fashion, food). Supports compression quality control. No transparency. Universally accepted by all marketplaces.
• PNG - best for images that require transparency or have sharp edges (logos, icons, product cutouts on transparent background). Larger file sizes. Not accepted everywhere (Zalando rejects PNG).
• WebP - Google's modern format offering 25-35% smaller files than JPEG at the same visual quality. Supported by Shopify and most web browsers. Not yet accepted by Amazon, eBay, or Etsy as a listing image format.

Three scaling strategies - fit, fill, blur background

When your source image has different proportions than the target dimensions, the resizer needs a strategy. We offer three approaches, each suited to different scenarios.

Contain (fit inside)

The entire image is scaled to fit within the target dimensions without any cropping. If the aspect ratios do not match, padding is added (white by default). This is the safest strategy for marketplace listings because no product detail is lost. Use it when uploading to Amazon, Allegro, or any platform that expects a square image from a rectangular source.

Cover (fill and crop)

The image is scaled to completely fill the target area. Excess pixels are cropped from the edges. This produces a clean, edge-to-edge result with no padding - ideal for social media posts and banners where visual impact matters more than showing the entire product. Use it for Instagram posts, Facebook ads, or Pinterest pins.

Blur background (smart padding)

This hybrid approach scales the image to fit inside the target area, then fills the remaining space with a blurred and enlarged version of the same image instead of solid-color padding. The result looks more professional than white padding while preserving the entire product. This works particularly well for lifestyle product shots where the background already has color and texture.

Batch processing - resize multiple images at once

Drag 10, 50, or 100 images at once. The resizer processes them in parallel using Web Workers, so your browser stays responsive. Each file gets the same preset, the same quality setting, the same scaling strategy. When all files are done, click "Download All" to get a single ZIP archive with every resized image inside.

This makes the tool especially useful for product photography studios that need to prepare dozens of packshots for a marketplace upload. Instead of running each file through Photoshop's batch action, drop the entire folder into the browser and let the resizer handle it.

Why image size matters for e-commerce conversion

Image quality directly affects sales. A 2024 study by Etsy found that listings with high-resolution photos received 30% more clicks than listings with low-resolution images. Amazon reports that enabling the zoom feature (which requires images above 1000 px) increases conversion rates by up to 25%.

But bigger is not always better. Oversized images (5000+ px) slow down page load times, especially on mobile connections. The goal is to hit the sweet spot: large enough for zoom and crisp display on retina screens, small enough for fast loading. For most marketplaces, 2000 x 2000 px at 85-90% JPEG quality achieves exactly that balance.

Consistent image dimensions across your product catalog also improve the shopping experience. When all thumbnails are the same size, the grid looks clean and professional. Mismatched dimensions create visual noise that makes your store look less trustworthy. Our preset system ensures every image in a batch comes out at identical dimensions.

Privacy and security - your images stay on your device

Most online image resizers upload your photos to their servers for processing. This creates privacy risks, especially if you are working with unreleased product images, client work, or anything under NDA.

Our resizer is different. The processing happens entirely in your browser using JavaScript. No image data is transmitted over the network. The tool works even when you disconnect from the internet (after the page has loaded). Your files remain on your hard drive from start to finish.

This also means there are no usage limits. Server-based resizers throttle free users because processing costs money. Since our tool uses your own CPU, there is nothing to throttle. Resize 1000 images a day if you want - it will never ask you to upgrade.

FAQ - frequently asked questions

How to resize an image online for free?

Use our free image resizer above. Drop your image (or click to browse), select a marketplace preset or enter custom dimensions, adjust the quality slider, and click download. The entire process runs in your browser - no registration, no uploads, no watermarks. You can resize single images or process entire batches at once.

How to resize image without losing quality?

Downscaling (making images smaller) is virtually lossless - you are removing pixels, not degrading them. The key is using a good interpolation algorithm (our tool uses the browser's built-in high-quality resampling). Upscaling (making images larger) always introduces some softness. For JPEG compression, stay at 85-92% quality for an excellent balance between file size and visual fidelity. At these levels, the compression artifacts are invisible to the human eye in product photos.

What size images for Amazon?

Amazon requires a minimum of 1000 x 1000 pixels and recommends 2000 x 2000 pixels in a 1:1 aspect ratio. The maximum file size is 10 MB. Accepted formats are JPEG, PNG, and TIFF. The main (MAIN) image must have a pure white background (RGB 255, 255, 255). Images below 1000 px lose the zoom feature, which can reduce conversions by up to 25%.

What size images for eBay?

eBay requires a minimum of 500 x 500 pixels and recommends 1600 pixels on the longest side. Maximum file size is 12 MB. Accepted formats are JPEG and PNG. eBay's search algorithm favors listings with larger, higher-quality images, so uploading at the recommended resolution improves your visibility.

How to resize multiple images at once?

Our resizer supports batch processing. Select multiple files from your file browser or drag an entire folder into the drop zone. All images will be processed with the same settings (dimensions, quality, format, scaling strategy). When finished, use the "Download All" button to get a ZIP file containing every resized image.

Is this image resizer really free?

Yes, completely free with no restrictions. No file count limits, no watermarks, no required sign-up, no premium tier. The tool runs in your browser using your device's processing power, so there are no server costs to offset. We built it as a free resource for the e-commerce community, complementing our professional product photography services.

Are my images safe?

Your images never leave your device. All processing happens locally in your browser using JavaScript Canvas API and Web Workers. No data is sent to any server - you can verify this by checking the Network tab in your browser's developer tools. This makes our tool the safest option for resizing confidential product photos, pre-launch images, or any files you would not want on a third-party server.

Looking for professional product photography? See our product photography pricing or browse the portfolio for examples. Need to learn more about packshots? Read our guide: Packshot - what exactly is it?