JPEG · PNG · WebP · Max 10 files
Whether you're a developer optimising assets, a photographer sharing work, or a business owner keeping page speeds fast, I7 Pixel's image compressor handles it in seconds — live in your browser, with no upload and no signup.
Compressing an image takes just four steps.
Choosing the right format and compression level makes a big difference to file size, quality, and web performance.
Lossy compression (JPEG, WebP) permanently discards image data to achieve smaller files. The quality slider controls how aggressively data is discarded — 85% is a good balance for most photos. Lossless compression (PNG) keeps every pixel intact but reduces file size by encoding repeated patterns more efficiently. For PNGs, reducing the colour palette (e.g. from 256 to 64 colours) is the most effective way to cut size.
WebP is a modern format developed by Google that achieves 25–35% smaller file sizes than JPEG at equivalent quality, and 26% smaller than PNG for lossless images. It is supported by all modern browsers (Chrome, Firefox, Safari 14+, Edge). If you're optimising images for a website, converting JPEGs and PNGs to WebP is one of the highest-impact performance improvements you can make.
This tool uses UPNG.js with k-d tree quantisation to reduce the number of colours in a PNG. A full-colour PNG uses 24-bit colour (up to 16.7 million colours). Reducing to 128 colours (8-bit palette) typically cuts file size by 60–80% with minimal visual difference for most graphics, logos, and illustrations. For photographs, JPEG or WebP is a better choice.
Quick reference for choosing the right format for your use case.
| Format | Compression | Best Used For | Typical Savings |
|---|---|---|---|
| JPEG Popular | Lossy | Photos, complex images with gradients, social media | 60–80% vs original |
| PNG | Lossless (palette) | Graphics, logos, screenshots, transparency required | 40–80% with palette reduction |
| WebP Popular | Lossy or Lossless | Web images, replacing JPEG/PNG for performance | 25–35% smaller than JPEG |
Image compression is a daily task across web development, photography, e-commerce, and content creation.
Answers to the most common questions about the image compressor.
Yes, completely free. There are no limits, no accounts, no watermarks, and no charges. Compress as many images as you need.
No. All compression happens entirely in your browser using JavaScript and the Canvas API. Your images are never transmitted to any server, so your files remain completely private.
The compressor supports JPEG, PNG, and WebP as both input and output. You can convert between formats — for example, input a PNG and output a WebP for smaller file sizes.
85% is the default and works well for most photos — good quality with significant size reduction. Use 75% for aggressive compression where quality is less critical, and 95% when quality is paramount. For PNG, try 64–128 colours as a starting point.
Yes. Drop up to 10 files at once onto the drop zone. They are processed with the same settings and you can download them individually or all at once with the Download All button.
Click the ⇔ Compare button to overlay the original and compressed images on the canvas with a drag-to-reveal divider. Move the divider left or right to expose each version and judge quality before downloading.
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All tools at I7 Pixel run in your browser — no uploads, no accounts, always free.
Free, fast online tools for images, PDFs, text, and developers. No install. No signup.