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Image Compressor

Re-encode one image at its original dimensions with an adjustable browser quality setting.

Step 1: Upload Image

Upload Image

Drag and drop your image here, or click to select

Supports JPG, PNG, WebP, and more

Compression Settings

SmallestBalancedBest

About

  • • Browser-based image compression
  • • Adjustable quality settings
  • • Compare output size and visible artifacts
  • • Compression runs with browser Canvas

Change encoding quality without changing dimensions

The image compressor redraws one image to a browser Canvas at its original pixel dimensions and asks the browser encoder to save it at the selected quality. It targets encoded file size; it does not resize width or height.

Choose compression when dimensions are already correct

  • •Reduce a JPG attachment while keeping its current width and height.
  • •Compare several quality settings before publishing a web image.
  • •Trim storage used by a lossy image without cropping it.

How to use this tool

  1. 1.Choose a supported browser-decodable image up to 50 MB.
  2. 2.Set quality and compress; start near 70% and inspect details rather than relying on one universal value.
  3. 3.Compare the displayed original and result sizes, then view the downloaded image at 100% zoom.

How format affects the slider

  • Processing happens in the browser with FileReader, Image, Canvas, and canvas.toBlob.
  • The canvas keeps the source dimensions and requests the source MIME type.
  • Quality has a visible effect on lossy encoders such as JPEG and WebP; browsers can ignore the quality argument for PNG, so PNG size may change little.

Example: prepare a 2400 × 1600 JPG for email

Compressing at 70% keeps the image at 2400 × 1600 but re-encodes its pixels. Fine texture may soften and the result may be smaller. If the attachment is still too large, resize the dimensions as a separate step.

What this compressor cannot promise

  • It cannot guarantee a target byte size or reduction percentage.
  • Repeated lossy compression can introduce block artifacts, halos, or banding.
  • Animated images are drawn as a single canvas frame, and browser codec support varies.

If compression is ineffective

  • PNG barely changes: use resizing or a format suited to photographic content.
  • Result is larger: the source may already be optimized; keep the smaller original.
  • Image will not load: try a common JPG, PNG, or WebP that your browser can decode.

Continue the workflow

Return to Image tools, or continue with a complementary tool:

Resize ImageReduce pixel dimensions as well as potential file size.JPG to PNGChange the container to PNG when that format is required.Batch Compress ImagesWork through multiple images in one workflow.

Understand how compression, dimensions, and image content affect file size

Questions about this specific tool

Does compression change image dimensions?

No. This tool keeps the Canvas width and height equal to the source image and changes encoding quality.

Why does PNG show little reduction?

The browser PNG encoder can ignore the quality setting because PNG is lossless. Resizing dimensions may have a larger effect.

Where does compression run?

The compression step runs in your browser. Preparing the final download uses the site download-result workflow.

What is the maximum input size?

The page validates image inputs against a 50 MB limit.