compress image or reduce image size in kb

Upload an image and reduce its file size in seconds.

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How the image compressor works

Upload a JPG, PNG or GIF image. The server strips metadata such as EXIF data and compresses the file with fixed settings: JPEG images are saved at quality 80, and PNG and GIF images are reduced to 256 colors. There is no quality slider and no resize option. The result is usually smaller than the original, but an image that is already compressed may shrink only a little.

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Compress image - Image Tools on a2z.tools

Quick answer

Upload an image, and the compressor reduces its file size while preserving visual quality, then gives you the smaller file to download.

Key facts

  • Only supports JPG, PNG, and GIF input formats
  • JPEG images are compressed using a fixed quality setting (quality 80)
  • PNG images are compressed via color quantization (reduced to 256 colors)
  • Image metadata (such as EXIF data) is stripped from the output as part of compression
  • Free to use, no signup required

What is this tool?

The image compressor shrinks JPG, PNG and GIF files so they load faster on websites and fit within upload limits, applying optimised encoding that keeps the picture looking sharp.

How to use it

Upload a JPG, PNG, or GIF image; the server automatically applies the appropriate compression for that format and returns a smaller file for you to download.
  1. Upload a JPG, PNG, or GIF image.
  2. The server compresses it using format-appropriate settings.
  3. Review the compressed result.
  4. Download the smaller file.

Example

Example: uploading a 5MB JPEG photo typically returns a visually similar image at a meaningfully smaller file size, due to the applied JPEG quality setting.

How it works

Your uploaded image is sent to A2Z Tools' server, where the ImageMagick.NET library strips metadata and applies format-specific compression: JPEG images are re-encoded at quality level 80, while PNG images are quantized to a 256-color palette; GIF images are quantized to 256 colors. The result is streamed back to your browser.

Common use cases

  • Speeding up web pages by shrinking hero and gallery images
  • Fitting images under email or form upload limits
  • Saving storage space for photo archives

Benefits

Free, fast, and automatically applies sensible compression settings without manual configuration.

Limitations

Compression is lossy for photographic formats: extreme size reduction can introduce visible artefacts. Already-optimised images may shrink only slightly.

Privacy & your data

Your image is uploaded to our server for compression and returned to you. Avoid uploading images that contain sensitive personal information.

Frequently asked questions

What image formats does this tool accept?
Only JPG, PNG, and GIF images are supported -- other formats will be rejected.
Can I control the compression quality?
JPEG images are compressed at a fixed quality level (80) and PNG images are quantized to 256 colors; there is currently no adjustable quality slider.
Does compression remove my photo's metadata?
Yes. Metadata such as EXIF data (which can include camera information) is stripped from the image as part of the compression process.
Is this tool free to use?
Yes, it's free with no signup required.

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