Image Compressor

What is image compression?

Image compression is the process of reducing the file size of an image while keeping its visual appearance as close to the original as possible. By compressing images, you reduce the amount of data needed to store and transfer them, which makes websites load faster and saves storage space on your device or server. There are two main approaches to image compression: lossy compression, which discards some image data to achieve a much smaller file size, and lossless compression, which preserves every pixel but reduces size more modestly. Choosing the right compression method and quality level lets you balance image quality against file size for each specific use case.

This online image compressor runs entirely in your browser, so you can compress JPG, PNG and WebP images without uploading them to any server. Adjusting the quality slider lets you control how aggressively the image is compressed and see the resulting file size in real time. The tool re-encodes your image through the Canvas API at the quality you choose — lower quality means smaller files, higher quality means sharper output, and everything happens locally on your device for complete privacy. You also get a live before/after size comparison so you can judge how much you reduced the image size at a glance.

JPG, PNG, WebP compression explained

Different image formats compress data in different ways, and understanding these differences helps you choose the best format to compress. JPG (JPEG) uses lossy compression designed for photographs and complex images with many colors, achieving very small file sizes by discarding visual information that is hard for the human eye to notice. PNG uses lossless compression and preserves every pixel exactly, which is ideal for graphics, logos, screenshots and images with transparency, but typically produces larger files than JPG for photographic content. WebP is a modern format from Google that supports both lossy and lossless compression, often producing smaller files than both JPG and PNG at similar quality.

When you compress a JPG image, the tool re-encodes it with the quality you select, trading a small amount of detail for a large reduction in file size. Compressing a PNG image re-encodes it as well, but because PNG is lossless it may not shrink much — for photographic PNGs, converting to JPG or WebP during compression usually produces a much smaller file. Compressing a WebP image takes advantage of its efficient encoding to reduce size further while keeping quality high. In every case the tool keeps the same format as the source so your compressed image works wherever the original did.

Lossy vs lossless compression

The choice between lossy and lossless compression determines how much you can reduce image size and whether the original can be recovered. Lossy compression permanently removes some image data to achieve the smallest possible file size, while lossless compression keeps all data intact so the image can be reconstructed exactly. The table below compares the two approaches to help you decide how to compress your images.

Aspect	Lossy compression	Lossless compression
How it compresses	Discards image data	Re-encodes without data loss
Quality loss	Yes, irreversible	No, identical to original
File size reduction	Large (often 50–90%)	Modest (typically 5–30%)
Reversibility	Not reversible	Fully reversible
Best for	Photos, web images, thumbnails	Graphics, logos, text, archives
Common formats	JPG, WebP (lossy)	PNG, WebP (lossless)

When to compress images

Compressing images is valuable in many situations where file size matters. The most common reason to compress images is website optimization — smaller images load faster, reduce bandwidth costs and improve the user experience, especially on mobile networks. Compressing images also saves storage space on your computer, phone or cloud service, letting you keep more photos and graphics without running out of room. Below are the most frequent cases where reducing image size makes a real difference.

• Website optimization: Reduce image size to speed up page loading, lower bounce rate and improve SEO rankings.
• Storage savings: Compress photos and graphics to fit more files in the same disk or cloud space.
• Email attachments: Many email providers limit attachment size, so compressing images helps them send successfully.
• Social media: Platforms re-compress uploads anyway, so starting with an optimized image keeps quality higher.
• SEO performance: Search engines reward fast pages, and compressed images are a key part of Core Web Vitals.
• E-commerce product images: Compress product photos so galleries load quickly without looking blurry.

How to compress images

Compressing an image with this tool takes only a few seconds and a handful of steps. Everything happens in your browser, so your images stay private and there is nothing to install. Follow the steps below to reduce image size and download a smaller file.

1. Upload an image: Drag and drop a JPG, PNG or WebP file onto the upload area, or click to browse and select one from your device.
2. Adjust the quality: Move the quality slider to choose how much to compress — lower values reduce image size more, higher values keep more detail.
3. Compress: Click the Compress Image button and the tool re-encodes your image at the selected quality right in your browser.
4. Compare sizes: The result box shows the original and compressed file sizes side by side, along with the percentage saved.
5. Download: If you are happy with the reduction, click Download Compressed to save the smaller image to your device.