Image Compression API: Step-by-Step Postman Test, Smaller JPGs, and SEO-Friendly Delivery
· 10 min read
Heavy images slow pages, inflate bandwidth bills, and work against Core Web Vitals—especially Largest Contentful Paint (LCP) when a large photo is the hero element. An image compression API lets you shrink JPG/PNG payloads in the pipeline (upload handlers, CMS imports, DAM workflows) instead of fixing files by hand.
This walkthrough uses PDF4me POST /api/v2/CompressImage with Postman: same pattern works in code once the request shape is clear. For a no-code first test, use the interactive Compress Image API Tester—it hits the same endpoint with form fields instead of raw JSON.
How to read this guide
- Follow steps 1 → 5; screenshots match a real run (your timings and byte counts will vary with image content and network).
- Replace the Postman placeholder
{{BASE64_OF_INPUT_IMAGE}}with the Base64 of your file—nodata:image/jpeg;base64,prefix in the JSON string. - After a successful call, decode the response to a
.jpgand compare file size in Explorer (or macOS Finder) to the original.