Is my image uploaded anywhere?

No. The AI model runs entirely in your browser using WebAssembly. Your image never leaves your device — not even for the initial model download, which is just the model weights, not your photos.

Why does the first run take longer?

The AI model weights (~40 MB) are downloaded from a CDN on first use and cached by your browser. Subsequent runs skip the download entirely and start processing immediately.

Is my image uploaded to a server?

The browser UI processes images entirely using the Canvas API — nothing is sent to any server. If you use the REST API endpoint (/api/image-resizer), your image is processed server-side using Sharp and is never stored or logged.

What is the maximum image size?

The browser UI has no explicit size limit — Canvas processes as large an image as your device memory allows (typically several megabytes or more). The API endpoint accepts base64-encoded images up to 3 MB, which is the Vercel free-tier request body limit.

Tool comparison

Background Remover vs Image Resizer & Cropper

Background Remover and Image Resizer & Cropper are both conversion tools. They serve related purposes but are optimised for different tasks — understanding the distinction helps you choose the right one for your workflow.

Bottom line

Background Remover changes image content by isolating the subject; Image Resizer changes only canvas dimensions. For most workflows, resize after removing the background so the crop is sized to the final subject.

What each tool does

Background Remover

Background Remover uses an AI model running entirely in your browser to detect and remove image backgrounds, returning a transparent PNG. The model is based on U-2-Net, a neural network architecture trained specifically for salient object detection — it identifies the main subject in an image and masks out everything else. Processing happens via WebAssembly (ONNX Runtime Web), which means the AI runs at near-native speed directly in your browser tab. No image is ever sent to a server — all processing is local, making it suitable even for confidential or proprietary photos. The output is always a 32-bit RGBA PNG with a transparent alpha channel where the background was, ready to be placed on any color or design without white halos or fringing.

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Image Resizer & Cropper

Image Resizer & Cropper is a free browser-based tool for resizing images to exact pixel dimensions, cropping a region of interest, rotating by 90-degree increments, and flipping horizontally or vertically. It accepts PNG, JPEG, WebP, AVIF, and GIF input and outputs PNG, JPEG, or WebP. The browser UI uses the Canvas API for instant live preview — no image is sent to a server. The REST API (POST /api/image-resizer) processes images server-side using Sharp for use in scripts, CI pipelines, and AI agent workflows. Common use cases include resizing photos for social media, cropping product images for e-commerce, fixing portrait/landscape orientation issues, and generating thumbnails.

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Side-by-side comparison

Feature	Background Remover	Image Resizer & Cropper
Category	conversion	conversion
Primary purpose	Remove image backgrounds instantly with AI — returns a transparent PNG	Resize, crop, rotate, and flip images online — free, runs in your browser, no upload required.
Inputs	image	image, width, height, fit, cropX, cropY, cropWidth, cropHeight, rotate, flipHorizontal, flipVertical, format, quality
Outputs	image	image, format, width, height, originalWidth, originalHeight, sizeBytes

When to use each

Use Background Remover when…

How to remove the background from a product photo

Create a transparent-background PNG of a product for e-commerce listings, catalogs, and marketing assets.

How to remove the background from a headshot photo

Create a transparent or white-background version of a professional headshot for LinkedIn, CVs, and company pages.

Use Image Resizer & Cropper when…

How to resize an image to exact pixel dimensions

Scale an image to a specific width and height for social media, email, or web use.

How to crop an image online for free

Remove unwanted areas from an image by cropping to a specific region or preset aspect ratio.

Frequently asked questions

Is my image uploaded anywhere?: No. The AI model runs entirely in your browser using WebAssembly. Your image never leaves your device — not even for the initial model download, which is just the model weights, not your photos.
Why does the first run take longer?: The AI model weights (~40 MB) are downloaded from a CDN on first use and cached by your browser. Subsequent runs skip the download entirely and start processing immediately.
Is my image uploaded to a server?: The browser UI processes images entirely using the Canvas API — nothing is sent to any server. If you use the REST API endpoint (/api/image-resizer), your image is processed server-side using Sharp and is never stored or logged.
What is the maximum image size?: The browser UI has no explicit size limit — Canvas processes as large an image as your device memory allows (typically several megabytes or more). The API endpoint accepts base64-encoded images up to 3 MB, which is the Vercel free-tier request body limit.