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Image Compressor

Compare JPEG/PNG compression candidates for JPG, PNG, or WebP inputs, using file size and pixel-error measures.

Runs locally in your browser. Your input is not uploaded or stored. You can verify this in your browser’s network panel.

Processing limits

  • Accepted formats: jpeg, png, webp
  • Maximum file size: 25 MB
  • Maximum image size: 40,000,000 pixels
  • Maximum files: 20
  • Maximum total batch size: 100 MB
  • Quality analysis sample: up to 2,000,000 pixels

Canvas output may remove metadata such as EXIF orientation and camera information.

What does this tool solve?

Compare JPEG/PNG compression candidates for JPG, PNG, or WebP inputs, using file size and pixel-error measures. Each image is analyzed independently; a positive size change means the output may be larger than the original. For dimensions or output formats, continue with Image Resizer or Image Format Converter. Multiple images are analyzed independently in your browser.

Continue with Image Resizer, Image Format Converter · Image compression: quality, size, and metadata

What examples should you start with?

Compare JPEG quality

Input
Text
JPG · 230 × 279 · 14.0 KB
Output
Text
JPEG quality 95 · 6.7 KB · RMSE 2.9

Analyze several images

Input
Text
10 JPG and PNG images
Output
Text
Independent quality tables, previews, and downloads

How does it work?

The browser creates JPEG candidates at qualities 30, 40, 50, 60, 70, 75, 80, 85, 90, 95, and 100, or PNG palette candidates at 8, 16, 32, 64, 128, and 256 colors plus a lossless baseline.

Each image gets its own candidate table, chart, preview, download, and continuation actions. Results stay in browser memory.

What are the edge cases and limits?

  • JPG, PNG, and WebP inputs are supported. WebP output quality analysis is handled by the format-adjustment tool.
  • The default limits are 25 MB per file, 40 megapixels per image, 20 files, and 100 MB per batch.
  • RMSE and maximum error are technical RGB metrics, not guarantees of subjective visual quality.
  • Canvas output may remove EXIF metadata such as camera information and orientation.

Technical reference

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