Image Optimizer & Compressor
Shrink JPG, PNG and WebP images for the web without the visible quality loss — drag, drop, compare before/after, and download. All in your browser.
Drop an image here, or click to browse
JPG, PNG, WebP or GIF · processed entirely in your browser
What does an image optimizer do?
An image optimizer reduces the file size of a photo or graphic so it downloads faster, while keeping it looking as close to the original as possible. It does this by re-encoding the image at a chosen quality level and, often, switching to a more efficient format like WebP.
This tool runs the compression directly in your browser using a Web Worker, so even large images are processed without uploading them anywhere. You pick a quality level and an output format, and you get an instant before/after comparison with the exact file sizes — no guessing whether it was worth it.
Smaller images are one of the highest-leverage things you can do for page speed and Core Web Vitals, which is why this is a staple in most front-end workflows.
How to compress an image
- 1
Add your image
Drag and drop a file onto the drop zone, or click to browse. JPG, PNG, WebP and GIF are all supported.
- 2
Choose quality & format
Slide the quality control and pick WebP, JPEG or PNG as the output.
- 3
Optimize
Click Optimize and watch the original and compressed versions appear side by side with their sizes.
- 4
Download
Happy with the result? Download the optimized image — the saving is shown as a percentage.
Why optimize images
Faster page loads
Images are usually the heaviest thing on a page; compressing them is the quickest speed win you can make.
Better Core Web Vitals
Lighter images improve LCP and overall scores, which feed directly into search rankings.
Lower bandwidth & cost
Smaller files mean less data for mobile users and cheaper hosting/CDN bills.
Private by default
Compression happens locally in your browser, so your images are never uploaded to a server.
WebP, JPEG or PNG — which should I pick?
- WebP is the best default for the web: it's typically 25–35% smaller than JPEG at the same quality and supports transparency.
- JPEG is the safe, universal choice for photographs where you don't need transparency.
- PNG is best for graphics with sharp edges, text, or transparency — but it's larger, so use it deliberately.
- When in doubt, export WebP and keep a JPEG fallback for very old browsers.
Lossy vs. lossless, in plain terms
Lowering the quality slider applies lossy compression — it discards detail your eye is unlikely to notice in exchange for a much smaller file. There's a sweet spot, usually around 70–80%, where the image looks identical but weighs a fraction of the original. Because you get an instant preview here, you can dial it in by eye rather than by guesswork.
Frequently asked questions
No. This optimizer compresses images entirely in your browser using a Web Worker. Your files never leave your device, which makes it safe for private or unpublished images.
It depends on the source, but converting a photo to WebP at ~75% quality commonly cuts the size by 50–80%. The tool shows the exact saving as a percentage after each run.
Not at the right settings. At 70–80% quality, the difference is usually invisible. The live before/after preview lets you find the point where the file is small but still looks great.
You can output WebP, JPEG or PNG. WebP gives the best size-to-quality ratio for the web; JPEG is the most universal; PNG is best for transparency and sharp graphics.
Because processing is local, you're only limited by your device's memory. Very large images (tens of megapixels) take a moment but work fine on modern hardware.
Re-encoding the image generally drops most embedded metadata such as camera EXIF and location tags, which both shrinks the file and improves privacy.
Need another tool?
Browse the full toolbox or dig into the blog for the engineering behind it.