Image quality optimizer
Image Quality Optimizer – Balance Image Quality and Size. No watermark added by QuickConvertOnline. Free, no account needed.
About Image quality optimizer
The image quality optimizer helps you find the point where an image looks good and loads fast. It starts with WebP output, a compact web format that keeps transparency, and lets you move the quality slider while comparing the original and optimized versions side by side with their file sizes.
It is aimed at web designers, developers and content editors who want lean images for pages, emails and apps without guessing at settings. Optimize up to 20 images with the same settings and download them as a ZIP. Everything runs locally in your browser.
How to use Image quality optimizer
- Drop images onto the upload box, click Choose image, or paste from the clipboard.
- Keep WebP as the output format, or choose JPG, PNG, AVIF or Original.
- Move the Quality slider and compare the Original and Result previews and sizes.
- When you are happy with the balance, click Download or Download ZIP.
Features
- WebP output by default, with JPG, PNG, AVIF (browser-dependent) and Original also available.
- Quality slider from 5% to 100%, starting at 82%.
- Side-by-side preview with dimensions, sizes and percentage change.
- Transparency is kept for WebP and PNG output.
- Batch optimization of up to 20 images with a ZIP download.
Common uses
- Preparing images for a website before upload to a content management system.
- Improving page speed scores that flag oversized images.
- Finding a single quality setting that works for a whole set of product photos.
- Reducing bandwidth for images in an app or newsletter.
Tips
- Judge quality at the size the image will be shown; small artifacts on a zoomed-in preview may be invisible on the page.
- Photos usually tolerate lower settings than images with text, logos or sharp lines.
Frequently asked questions
How is this different from the image compressor?
Both use the same quality controls. The optimizer starts with WebP output, aimed at web delivery, while the compressor starts with JPG. Use whichever default fits your target; you can switch formats in either tool.
What quality setting is best for web images?
There is no single best value. Start at 82% and lower it while watching the preview. Many photos look fine noticeably lower, while graphics with text often need a higher setting. The goal is the smallest size you cannot tell apart from the original.
Should I use WebP or AVIF?
AVIF can be smaller, but not every browser can export it, and some older browsers cannot display it. WebP is supported by all current major browsers and gives a strong size reduction, which makes it the practical default.
Does optimizing resize my images?
No. The optimizer keeps the original dimensions and changes only the encoding. Large photos shown small on a page also benefit from resizing, which you can do with the image resizer.
Is my input uploaded?
Tools run in your browser. Files, text and results are not uploaded to our servers and are cleared when you leave the tool.
Your privacy comes first
Tools run in your browser. Files, text and results are not uploaded to our servers and are cleared when you leave the tool.