How much can I reduce an image file?

Typically 50-80% size reduction. A 3 MB JPEG becomes 500-800 KB at quality 80 with virtually no visible difference.

Will compression affect image dimensions?

No. Compression only reduces file size — the image dimensions (width × height) remain unchanged.

What quality setting should I use for web?

75-80% is the industry standard for web images. At this level, most people cannot detect any quality difference.

Can I compress multiple images at once?

Batch compression is available with FileSwiftly Pro. The free tool compresses one image at a time.

压缩图片

Q: Which image formats are supported?

JPEG, PNG, WebP and GIF. For best results use JPEG for photos and PNG for graphics with transparency.

在保持最佳质量的同时减小JPEG、PNG和WebP图片的大小。

~2–8 secondes Réduction : 50–80% JPG, PNG, WebP, AVIF Supprimé après 1h

将图片拖放到此处

或点击选择

JPEG, PNG, WebP, GIF — 最大50 MB

质量

低高

75%

实际效果

典型文件的实际压缩示例

前 / 后

3.2 MB

之前

0.8 MB

之后

75% 平均压缩率

75%

平均压缩率

平均时间

按模式压缩比

JPEG 80% −70至−75%

前

100%

后

28%

PNG −60至−70%

前

100%

后

35%

WebP −75至−80%

前

100%

后

22%

"我的3MB照片压缩到不到300KB，几乎看不出差别，太棒了！"

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1小时后自动删除

每天处理50,000+文件

30秒内完成处理

How to compress an image online without quality loss?

Image compression reduces file size by 50 to 80% while preserving visual quality. FileSwiftly optimises your JPEG, PNG, WebP and GIF files directly in your browser with no installation required. The result: lighter images that load faster on the web.

JPEG, PNG and WebP compression

For JPEG photos, a quality level between 75 and 85% is the standard used by Google, Facebook and Twitter — visually indistinguishable but 60–75% lighter. For PNG images (logos, screenshots), lossless compression reduces size by 20–40% without changing a single pixel. The WebP format achieves up to 30% additional compression over JPEG at equivalent quality — ideal for modern websites.

Why optimise your website images?

Images account for an average of 60% of a web page's weight. Unoptimised images slow loading, hurt Google PageSpeed scores, and degrade user experience. Reducing image weight directly improves your SEO ranking, Core Web Vitals (LCP), and conversion rates.

Batch image compression with FileSwiftly Pro

The free plan compresses one image at a time. FileSwiftly Pro allows compressing up to 50 images simultaneously, exporting to WebP or AVIF, and accessing the REST API to automate compression in your development workflows.

FAQ

What quality setting should I use?

75–85% is optimal for most web uses. Below 60%, compression artifacts become visible in smooth areas.

Does compression change image dimensions?

No. Compression only reduces file weight, not dimensions (width × height). Use our Resize tool to change dimensions.

Which image formats are supported?

JPEG, PNG, WebP, and GIF as input. Output keeps the same format. Use our Image Converter to change formats.

需要更多？

Pro版支持一次压缩50张图片

批量处理导出WebP和AVIF格式 REST API访问

了解FileSwiftly Pro

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压缩 图片

质量

实际效果

How to compress an image online without quality loss?

JPEG, PNG and WebP compression

Why optimise your website images?

Batch image compression with FileSwiftly Pro

Avis & Notation

Donnez votre avis

相关工具

压缩图片