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Image Compressor

Compare JPEG and PNG compression candidates for multiple JPG, PNG, or WebP images. Review file sizes, RGB pixel error, and original-versus-output previews locally.

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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 multiple JPG, PNG, or WebP images, using file size and RGB pixel-error measures. Each image is analyzed independently; a positive size change means the output is larger than the original. For smaller pixel dimensions, use Image Resizer. For WebP output, use Image Format Converter.

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

Compare a batch

Input
Text
10 JPG and PNG images
Output
Text
Per-image candidate 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; compression candidates are JPEG and PNG only. Use Image Format Converter for WebP output.
  • 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. Large images use an analysis image of up to 2 megapixels.
  • Transparent pixels use a white background in JPEG output. Canvas output may remove EXIF metadata such as camera information and orientation.

Technical reference

Related tools

  • Image ResizerResize multiple JPG, PNG, or WebP images by dimensions or percentage. Check output dimensions, preserve proportions when needed, and download the results locally.
  • Image Format ConverterBatch-convert JPG, PNG, and WebP images in your browser. Review the output format and file-size change, then download individual images or a ZIP.
  • Image TransformerRotate and flip multiple images locally in your browser.
  • Image Color PaletteExtract five representative colors from images locally.

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