Why image file size matters
Large images slow down websites, waste bandwidth, fill up email inboxes, and consume storage. A single unoptimised photo from a modern phone can be 5-10 MB. For a web page with 20 images, that is 100-200 MB per page load - far too much for fast performance. Reducing image sizes is one of the most impactful things you can do for web performance.
Method 1: Choose the right format
The simplest way to reduce file size is to use a more efficient format. WebP files are typically 25-35% smaller than JPG at the same quality. If your images are PNGs (common for screenshots and graphics), converting to WebP can reduce sizes by 50% or more. For photographs, avoid using PNG - JPG or WebP are far more efficient for photographic content.
Method 2: Adjust quality
Most image compression tools let you choose a quality level. For web use, quality 75-85% is the sweet spot - visually indistinguishable from the original for most viewers, but significantly smaller in file size. Quality 60-70% works well for thumbnails and preview images. Only use quality 90-100% when visual perfection is essential (portfolio work, product photography for zoom).
Method 3: Resize dimensions
If your image is 4000×3000 pixels but displayed at 800×600 on a website, you are sending 25 times more pixels than needed. Resize images to their display dimensions (or 2× for retina displays). A 1600×1200 image at quality 80 will look sharp on any screen and be a fraction of the original file size.
Method 4: Remove metadata
Every photo from a camera or phone contains EXIF metadata - location, camera model, settings, timestamps. This data can add 10-50 KB per image. Stripping metadata with the Remove EXIF tool reduces file size and removes potentially sensitive location data.
Recommended workflow
For the best results, combine these methods: resize to the needed dimensions, convert to WebP or compressed JPG at quality 80, and strip metadata. ToolPouch's "Optimize Image for Web" workflow does all of these steps in sequence. Process up to 100 images at once and download them as a ZIP.