Image Compressor

Compress JPG, PNG, and WebP images in bulk — right in your browser. No uploads, no sign-up, no limits. Uses Web Workers for fast, private, client-side compression.

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Compression Settings

Adjust before dropping your images.

75%
Smaller file Better quality
No limit
No limit 2 MB

When set, the library will iterate to meet the target.

Drop images here or click to browse

Supports JPG, PNG, WebP — batch up to 50 files

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Reference

Formats & Best Practices

Choosing the right format and quality setting

JPG / JPEG
Best for Photos

JPG uses lossy compression — ideal for photographs. Quality 70–85% is usually imperceptible to the human eye while reducing file size by 50–70%. Avoid for images with text or sharp edges.

PNG
Lossless & Transparent

PNG uses lossless compression and supports transparency. Best for logos, icons, and screenshots. PNG files are typically larger than JPG for photos, but can compress well for graphics with flat colours.

WebP
Modern & Efficient

WebP offers 25–35% smaller file sizes than JPG/PNG at equivalent quality. Supported by all modern browsers. Use WebP for web images to boost page speed. It supports both lossy and lossless modes.

Quality Guide
Recommended Settings

Social media: 80% · E-commerce: 75% · Thumbnails: 60–70% · Print-ready web: 90%. For WebP, you can go 5–10% lower than JPG for the same visual result.

All compression runs entirely in your browser. Your images are never uploaded to any server — they stay private on your device. The tool uses Web Workers to avoid freezing the page during batch compression.

FAQ

Common Questions

Is there a file size or count limit?
There's no hard limit imposed by this tool — it runs entirely in your browser. In practice, your browser's available memory is the constraint. For batch jobs, we recommend keeping individual files under 20 MB and batches under 50 files at a time for best performance.
Will compression reduce my image quality noticeably?
At 75% quality (the default), the difference is imperceptible for most photos on screens. PNG compression is lossless so quality is preserved entirely. For JPG and WebP, if you need pristine quality use 90%+; for thumbnails and social media, 65–75% is plenty.
Why is my PNG barely compressed?
PNG is a lossless format, so there is a ceiling on how much the file can shrink. For aggressive size reduction on PNG files, switch the output format to WebP or JPG (accepting the transparency trade-off for JPG). A complex photograph as a PNG can often be halved in size by converting to WebP.
Can I convert between formats (e.g. PNG → WebP)?
Yes — select the desired output format in the settings panel before compressing. Any JPG, PNG, or WebP input can be converted to any of the three output formats. The downloaded files will be renamed with the correct extension automatically.
How does "Target Max File Size" work?
When enabled, the library iterates through quality levels to find the highest quality that still meets your target byte size. This is useful when you need images under a specific limit (e.g. email attachments or upload fields). The quality slider becomes a maximum cap in this mode.
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