Image Resizer & Compressor
Resize, compress and convert images instantly — without losing quality.
What is it?
An image resizer and compressor is an essential tool for anyone who works with photos, graphics or web content. Whether you are a blogger optimizing images for page speed, a web developer reducing asset sizes for a production build, or simply someone who needs to send a large photo by email, having a reliable way to resize and compress images without installing software saves an enormous amount of time. This tool lets you drag and drop any image — JPEG, PNG, WebP or GIF — and instantly control its output dimensions and compression quality. You can scale images by exact pixel dimensions while locking the aspect ratio to prevent distortion, or override width and height independently. The quality slider lets you find the perfect balance between visual clarity and file size. You can export the result as JPEG, PNG or WebP depending on your use case: JPEG for photos, PNG for graphics with transparency, and WebP for the best compression on the modern web. Everything happens entirely in your browser using the HTML5 Canvas API. Your image never leaves your device — it is never uploaded to any server, never stored, and never shared. This makes the tool completely private and fast even on large files.
How to use it
- Click "Choose image" or drag and drop a JPEG, PNG, WebP or GIF onto the upload area.
- Your original image dimensions and file size are shown immediately.
- Enter the target width or height in pixels. Enable "Lock aspect ratio" to scale proportionally.
- Move the quality slider to control compression (higher = better quality, larger file).
- Choose the output format: JPEG (best for photos), PNG (preserves transparency), or WebP (modern, smallest size).
- The compressed preview updates automatically, showing the new dimensions and estimated file size.
- Click "Download" to save the resized and compressed image to your device.
Why use this tool
Large image files are one of the most common causes of slow websites and rejected email attachments. A standard smartphone photo can easily be 4–6 MB — far too large for web use, where images should ideally be under 200 KB for fast loading. Google's Core Web Vitals and PageSpeed scoring both heavily penalize oversized images. This tool addresses the problem at the source. By combining resizing and compression in a single step, you can take a 5 MB RAW-exported JPEG, scale it to 1200 × 800 pixels at 80% quality, and get a web-ready image under 150 KB in seconds. The WebP option takes this even further — modern browsers support WebP natively, and it typically achieves 25–35% smaller files than JPEG at equivalent quality. The fact that the entire process runs in your browser using Canvas means there is zero latency from file uploads, zero privacy risk, and no dependency on server availability. You can use this tool offline, behind a firewall, or on a private corporate network without any issues.
Frequently asked questions
Does my image get uploaded to a server?
No. This tool processes your image entirely in your browser using the HTML5 Canvas API. Your file never leaves your device and is never sent to any server. The download is also generated locally.
What image formats are supported?
You can upload JPEG, PNG, WebP and GIF files. For output, you can choose between JPEG, PNG and WebP. Note that if you upload a PNG with transparency and export as JPEG, the transparent areas will be filled with white.
What is the difference between resizing and compressing?
Resizing changes the pixel dimensions of the image (e.g. from 4000×3000 to 800×600). Compressing reduces the file size by discarding some image data, controlled by the quality setting. You can do one, the other, or both at the same time.
What quality setting should I use for web images?
For most web images, a quality setting of 75–85% provides an excellent balance between visual quality and file size. At this range, the compression is barely noticeable but file sizes can be 50–70% smaller than at 100% quality.
Why is my PNG file larger after compression?
PNG uses lossless compression, so the "quality" slider has no effect on PNG output — the file size is determined entirely by the pixel dimensions and the image content. To significantly reduce a PNG file size, either reduce the dimensions or export as WebP or JPEG instead.