How to Compress Images Before Uploading to Your Website

Why Pre-Upload Optimization Wins

The worst time to discover an image is 4MB is after it is already live and slowing your page. Fixing it then means re-uploading, clearing caches, and hoping visitors don’t bounce in the meantime. Optimizing before upload turns a messy, reactive chore into a repeatable habit that keeps every page fast from day one — and it is almost free once the routine is in place.

The Pre-Upload Checklist

1. Resize to the exact display dimensions the layout needs.
2. Choose the format: JPG or WebP for photos, PNG for graphics and transparency.
3. Compress: JPG at ~80%, PNG lossless, WebP where the browser supports it.
4. Rename the file with a descriptive, keyword-rich name (not DSC_4821.png).
5. Add meaningful alt text in your CMS for accessibility and context.
6. Verify the page still hits "good" Core Web Vitals after publishing.

Common Mistakes to Avoid

• Uploading full-resolution camera photos straight from the SD card.
• Saving photographs as PNG "to keep quality" — it only adds size.
• Forgetting to strip EXIF metadata (privacy + bytes).
• Skipping alt text and descriptive file names, wasting free SEO signal.
• Letting a CMS create multiple resized copies you never use.

Example Workflow for a Blog Post

Say you are writing a post with one hero and four inline photos. Export the hero at 1600px wide and compress to ~120KB WebP (fallback JPG). Export each inline photo at 820px and ~80KB. Rename them to match the topic. Add alt text as you upload. The whole post then ships under 600KB of images — fast on mobile, kind to your LCP, and easy for Google to crawl.

Tools That Fit the Workflow

You do not need desktop software. A browser-based compressor and resizer handle resizing, format choice and compression in one pass, with no upload of your files to a server. Build the checklist around whatever tool you will actually use consistently — consistency beats the perfect tool you open once.