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Image Compressor

Compress images and convert between JPEG, PNG, and WebP with an adjustable quality slider. Runs in your browser; your photos are never uploaded.

About Image Compressor

The Image Compressor reduces the file size of a JPEG, PNG or WebP image by re-encoding it at a quality level you control. Upload a picture, move the quality slider, and the tool shows the original and compressed versions side by side with their file sizes so you can see the exact saving before you download.

Compression runs in your browser using the canvas, so the original photo is not uploaded. Downloading the compressed file requires a free ToolGhost account.

How to use the Image Compressor

  1. Choose an image from your device.
  2. Pick the output format: JPEG, PNG or WebP.
  3. Move the Quality slider. Lower values give smaller files; the preview and size update immediately.
  4. Compare the Original and Compressed panels, then click Download Image (sign in if prompted).

What it can do

Quality slider

Choose anywhere from 10% to 100% quality and see the size change in real time.

Format choice

Convert to JPEG, PNG or WebP while compressing. WebP often gives the smallest files for the same visual quality.

Side-by-side preview

Compare before and after, with exact sizes for each.

Browser-based

Your image never leaves your device during compression.

When it is useful

  • Shrinking photos so a web page loads faster and scores better on page-speed tests.
  • Getting an image under a size limit for a form, application portal or email.
  • Saving storage by compressing large camera photos.
  • Converting an image to WebP for a website.

Good to know

  • JPEG and WebP quality settings are lossy. Very low quality can introduce visible artefacts, so check the preview.
  • PNG output in browsers is lossless and the quality slider has little effect on it. Use JPEG or WebP for big savings on photos.
  • Converting a transparent PNG to JPEG removes the transparency, which becomes a solid background.
  • Metadata such as EXIF data is not preserved in the compressed output.

Read the guide: Free Online Image Compressor Guide

Related tools: Image Resizer, Compress PDF, PDF to Image, YouTube Thumbnail

Frequently Asked Questions

Q.What quality setting should I use?
For photos, 70% to 85% usually keeps good visual quality while cutting file size considerably. Check the preview and lower it until you notice a difference.
Q.Is my image uploaded to a server?
No. The compression is done in your browser. You only need to be signed in to download the result.
Q.Why does a PNG not get much smaller?
PNG is lossless, so browser encoding keeps all the pixel data. For smaller files, switch the output to JPEG or WebP, or use the Image Resizer to reduce the dimensions.
Q.Which format gives the smallest file?
For photographs, WebP is usually smallest, followed by JPEG, then PNG. For screenshots and graphics with flat colours, PNG or WebP can be best.
Q.Do I need an account?
Compression and preview work without one, but you need to sign in to download the compressed file.
Q.Will it keep my photo’s EXIF data?
No. Re-encoding drops metadata such as camera details and location.
Q.Can it compress multiple images at once?
Not at the moment. Process images one at a time.

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