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ConvertSwift
Browse Tools
100% Secure: Processed locally in your browser. No files are uploaded to our servers.

Free Online Image Compressor

Compress JPG, PNG, and WebP images. Real-time before/after visual slider, 1:1 pixel checker, and target size limits.

Drag & drop files here, click to browse, or paste image with Ctrl+V

Supports PNG, JPG, WebP, SVG, BMP, and GIF
original before Original Image
compressed after Compressed Image
💡 Drag the image slider left or right to compare details.

Original: 5.2 MB | Compressed: 850 KB (83% Saved)

Compression Level
70%
Lower quality yields smaller file sizes.
Target File Size Limit
Auto-tunes compression logic to stay under this value.
Output Settings

How to compress images locally?

Compressing images on ConvertSwift takes just three quick steps, entirely without internet dependencies once the site is loaded:

  • Select your local JPG, PNG, or WebP file.
  • Adjust the visual compression slider or enter a custom target file size.
  • Slide the before/after divider to visually inspect details and download the file.

Why client-side image compression is safer

Typical web tools require you to upload photos to a remote system where they are saved and converted. For personal snapshots or private business graphics, this presents security breaches.

ConvertSwift uses standard browser Canvas rendering context libraries. Your image is imported locally into RAM, redrawn at the requested scale, and downloaded directly—ensuring absolute privacy.