Image Compressor

Oversized images are the number one cause of slow websites, rejected email attachments and full phone storage. Our free image compressor reduces the file size of JPG and PNG images by re-encoding them at a quality level you control, right inside your browser. Nothing is uploaded to a server, which makes it safe for personal photos and client work alike. You see the original size, the compressed size and the percentage saved before you download, so you can balance quality and weight with confidence.

Quick Answer: Upload a JPG or PNG, set the quality slider (80 is a great default), and download the compressed copy. The tool shows original versus new file size and the exact percentage saved.

Free Online Tool

Image Compressor

Compress photos in your browser. Nothing is uploaded anywhere.

No image selected yet.



How to Use the Image Compressor

  1. Click the file picker and choose a JPG or PNG image from your device.
  2. Note the original file size shown under the preview.
  3. Move the quality slider: 80 to 90 keeps images looking sharp, 50 to 70 gives much smaller files for web thumbnails.
  4. Watch the compressed size update live and compare the preview with the original.
  5. Click Download Compressed Image and save the optimised copy with a new name.

Key Features

  • Adjustable quality slider with live size feedback as you drag.
  • Side-by-side before and after sizes plus the percentage saved on every image.
  • Outputs efficient JPEG encoding, ideal for photographs and web graphics.
  • Your image never leaves your device; compression uses the browser’s canvas engine.
  • Works with photos from any camera or phone, including multi-megapixel images.

Best Practices and Tips

  • For website hero images, quality 80 at the displayed dimensions is usually indistinguishable from the original at a third of the size.
  • Compress a copy, never your only original; keep the full-quality master in your archive.
  • Resize first if the image is much larger than where it will be shown; a 4000-pixel photo in a 800-pixel slot wastes megabytes no quality setting can fully fix. Our Image Resizer can help.
  • Batch your workflow: compress all images for an article before uploading any of them to your CMS.

Common Mistakes to Avoid

  • Compressing an already-compressed image again and again; each re-encode compounds quality loss, a problem called generation loss.
  • Using very low quality for images containing text or screenshots, which develop fuzzy edges and blocky artefacts quickly.
  • Assuming PNG is best for photos; photographic PNGs are enormous compared with JPEG at the same visual quality.

Frequently Asked Questions

How much smaller will my image get?

It depends on the image and quality setting. Photographs typically shrink by 50 to 80 percent at quality 80 with no visible difference on screen. Images that were saved at maximum quality by editing software shrink the most.

Does compression reduce the image dimensions?

No. This tool keeps the same width and height and reduces only the file size by re-encoding. If you need smaller dimensions as well, use the Image Resizer first, then compress.

Will my image be uploaded to your server?

No. The file is read and processed entirely in your browser using the HTML canvas. You can verify this by disconnecting from the internet after the page loads; the tool still works.

What happens to transparent PNG images?

Transparency cannot be stored in JPEG, so transparent areas are placed on a white background in the output. For logos that must stay transparent, keep the PNG format and accept a larger file, or reduce dimensions instead.

Which quality setting should I choose?

Start at 80. It is the classic sweet spot for web photographs. Go up to 90 for portfolio pieces where detail matters, and down to 60 for thumbnails and previews where small size matters more.

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