onthu.com🦎

Private Image Compressor

Reduce image size securely. Images are processed locally on your device.

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Drag & Drop or Click to Upload

Supports JPG, PNG, WEBP (Max 20MB)

Original Size
0 KB
Compressed Size
0 KB
(-0%)
Low Quality High Quality

Preview

Compressed Preview

Why Use This Tool?

  • 100% Private: Your photos never touch our servers. All processing happens in your browser.
  • Visual Feedback: Use the quality slider to find the perfect balance between file size and look.
  • Fast: No upload or download wait times.

How to Compress Images

  1. Upload your image: Drag and drop your JPG, PNG, or WebP file into the box above, or click to select from your device.
  2. Adjust Quality: Use the slider to reduce the file size. Lower quality means smaller file size.
  3. Preview & Download: Check the preview image to ensure it looks good, then click "Download" to save the optimized version.

Frequently Asked Questions

Is it safe to use?

Absolutely. Unlike other tools, we do not upload your images to any server. All compression happens locally on your phone or computer.

What formats are supported?

We currently support JPEG, PNG, and WebP formats.

Does it reduce quality?

Yes, file size reduction usually involves removing some data. However, our smart compression algorithm maintains high visual quality even at significant size reductions.

Understanding Image Compression

Image compression is the process of reducing file size by eliminating redundant data while maintaining acceptable visual quality. Understanding how it works helps you make better decisions about quality settings.

Lossy vs. Lossless Compression

  • Lossy Compression (JPEG, WebP): Permanently removes some image data to achieve smaller file sizes. The quality slider controls how aggressively data is removed. Higher compression = smaller file = more quality loss.
  • Lossless Compression (PNG): Reduces file size without losing any data. File sizes are larger but quality is perfectly preserved. Best for graphics, logos, and images with text.

When to Use Which Format

Format Best For Avoid For
JPEG Photographs, complex images with gradients Text, logos, graphics with sharp edges
PNG Graphics, logos, screenshots, images with text Large photographs (file size will be huge)
WebP Web images (supports both lossy and transparency) Print or when older browser support is needed

Quality Settings Explained

  • 90-100%: Minimal compression, nearly indistinguishable from original. Good for archiving.
  • 70-89%: Balanced compression, usually no visible quality loss. Ideal for most web use.
  • 50-69%: Noticeable compression, minor artifacts may appear. Good for thumbnails or previews.
  • Below 50%: Heavy compression, visible artifacts. Only use when file size is critical.

Why Compress Images?

  • Faster Websites: Smaller images load quicker, improving user experience and SEO rankings.
  • Save Storage: Reduce the space photos take up on your device or cloud storage.
  • Email Attachments: Stay under email size limits when sharing photos.
  • Social Media: Many platforms compress uploads anyway—pre-compressing gives you more control.
  • Mobile Data: Smaller images use less data when browsing or uploading on cellular networks.

Tips for Best Results

  1. Start High, Go Lower: Begin at 80% quality and decrease until you notice quality degradation, then step back up slightly.
  2. Check Critical Areas: Pay attention to faces, text, and detailed patterns when evaluating quality.
  3. Consider the Use Case: Thumbnails can tolerate more compression than hero images.
  4. Preserve Originals: Always keep an uncompressed backup before compressing important photos.