Large images slow down websites, fill up email attachments and get rejected by upload forms with limits like “maximum 200 KB”. The good news: you can usually cut an image’s file size by 50–80% without anyone noticing a difference.
Here is exactly how to do it, step by step, using free tools.
In this guide
- Why are some images so large?
- Step 1: Resize to the size you actually need
- Step 2: Compress the image
- Step 3: Choose the right format
- Step 4: Remove unnecessary metadata
- How small should images be?
Why are some images so large?
File size depends on three things: the dimensions (width × height in pixels), the format (JPG, PNG, WebP…) and the compression level. A 12-megapixel phone photo is about 4000 × 3000 pixels — far larger than any website or form needs.
Step 1: Resize to the size you actually need
If an image will be shown 1200 pixels wide on a website, there is no reason to upload a 4000-pixel version. Reducing dimensions is the single biggest saving, often cutting the size by more than half on its own.
Step 2: Compress the image
Upload your picture to our free Image Optimizer. It removes hidden data and applies smart compression that keeps the image looking the same to the human eye.
Step 3: Choose the right format
- Photos: JPG or WebP.
- Logos, screenshots and graphics with text: PNG or WebP.
- Websites: WebP or AVIF give the smallest files.
Converting a photo from PNG to JPG can shrink it dramatically — try our PNG to JPG converter or JPG to WebP converter.
Step 4: Remove unnecessary metadata
Photos contain EXIF data (camera model, date, sometimes GPS location). Removing it saves a little space and protects your privacy. Check what your photos contain with our EXIF Reader.
How small should images be?
- Website hero images: under 200–300 KB
- Blog and product images: under 100–150 KB
- Email images: under 100 KB each
Frequently asked questions
Does compressing an image always reduce quality?
Lossy compression removes some data, but good tools remove only what the eye cannot see. Lossless compression keeps every pixel.
What is the best format for small file size?
AVIF and WebP usually produce the smallest files, followed by JPG for photos.
How do I check an image’s file size?
On Windows right-click → Properties; on Mac select the file and press Cmd + I.
