Guide

How to Compress Images Online

Shrink image file size without visibly hurting quality. Here is how compression works and how to get the best balance.

Short answer: Open our free image compressor, add your photo, pick a format and quality, and download the smaller file. Everything runs in your browser — nothing is uploaded.

Why Compress Images?

  • Photos sent by email or messenger are faster to send and receive.
  • Web pages and galleries load much faster with optimized images.
  • Forms, stores, and portals often cap upload size — compression gets you under the limit.
  • Smaller files free up storage space while staying perfectly usable.

Choosing the Right Format

The best format depends on the image:

  • WebP and AVIF give the best size-to-quality ratio for photos and graphics, and are supported by all modern browsers.
  • JPEG is the safe, universally compatible choice for photos.
  • PNG is best when you need transparency, such as logos and cut-out images.

Quality Settings Explained

Compression quality is a trade-off between file size and detail:

  • Quality 70–85: Usually looks identical to the original on screen while cutting the file size roughly in half or more. A great default.
  • Quality 50–70: Noticeably smaller files, fine for web use where the image is viewed at a small size.
  • Below 50: Visible compression artifacts; best avoided except for thumbnails.

You can also set a maximum width to downscale very large photos, and a target file size with auto-fit to automatically find the quality that hits a specific KB goal.

How to Compress an Image in 4 Steps

  1. Open the compressor. Visit image.openservicetools.com and choose the Compressor tool.
  2. Add your image. Drag and drop a JPG, PNG, WebP, GIF, BMP, or AVIF file into the drop zone.
  3. Set your options. Choose the output format, quality, optional max width, or a target file size and press Auto.
  4. Download the result. Download the optimized copy. Your original file is never modified.

Tips for the Best Results

  • Cap the width at the largest size the image will ever be displayed at — a 4000 px photo shown at 800 px wastes megabytes.
  • Use WebP or AVIF for website images to get the smallest files.
  • Keep PNG for images that need transparency.
  • For photos destined for email, a quality of 80 at a reasonable width is usually the sweet spot.

Compression always creates a new, optimized copy — the original is never touched.

Privacy When Compressing Images

  • Runs on your device: Processing uses the browser's Canvas API with no upload.
  • No server storage: Nothing is sent to a server or retained.
  • No account needed: Compress images without signing up.

Frequently Asked Questions

JPG, PNG, WebP, GIF, BMP, and AVIF files are supported.

At quality levels around 80, images look virtually identical to the original while being much smaller. You control the trade-off.

No. Compression happens entirely in your browser, so your photos stay on your device.

Compress Your Images Now

Shrink photos and graphics in seconds with our free, private tool.

Open Image Compressor