Why Do Images Look Blurry After Uploading? (Diagnosis & Fix)
Why Do Images Look Blurry After Uploading? (Diagnosis & Fix)
Few things are as frustrating as uploading a perfectly sharp image and having it appear blurry on the destination platform. This problem has three distinct causes, and each has a different fix. Identifying which cause applies to your situation is the key to solving it permanently.
Cause 1: The Platform Recompressed Your Image (Most Common)
Every major platform — Instagram, Facebook, WordPress, Shopify, LinkedIn — recompresses every uploaded image. They do this to:
- Reduce storage costs (a platform storing billions of images must compress aggressively)
- Speed up delivery to users on slow connections
- Serve optimised versions for different screen sizes
The problem occurs when your source image is already highly compressed. If you upload a JPG at quality 50, the platform compresses it again — and double-compression compounds artefacts dramatically.
The fix: Upload at the highest quality your source allows. Quality 85–95 is the sweet spot — the platform's compression step will be its only compression pass, and the result stays acceptable. Use Compress Image to clean the image before uploading.
Cause 2: Your Image Is Smaller Than the Display Container (Upscaling)
Every platform has a minimum display size. If your image is smaller than this, the platform scales it up — which always introduces blurriness because pixels must be invented to fill the gaps.
| Platform | Minimum Recommended Upload Size |
|---|---|
| Instagram post | 1080 × 1080 px |
| Facebook post image | 1200 × 630 px |
| LinkedIn post | 1200 × 627 px |
| WordPress featured image (typical) | 1200 × 800 px |
| Website hero image | 1920 × 1080 px |
The fix: Always upload at or above the platform's recommended dimensions. Use Resize Image to hit the exact required size from a higher-resolution source.
⚡ Fix This Instantly: Drop your image into Resize Image to match the platform's required dimensions exactly, then compress at Q85 with Compress Image before uploading. This eliminates both causes in one workflow.
Advertisement
Cause 3: Wrong Format for the Content Type (Text and Graphics)
JPG compression creates ringing artefacts around high-contrast edges. This is invisible on photographs (which have lots of gradual tonal variation) but very visible on:
- Text
- Logos with flat colours
- Screenshots of interfaces
- Illustrations with sharp lines
When you upload a screenshot or logo as JPG, the JPG compression blurs the sharp edges of letters and lines.
The fix: Use PNG for anything with text, sharp lines, or flat colours. PNG is lossless and preserves every pixel exactly. Convert your JPG logo to PNG using JPG to PNG before uploading.
Diagnosis Checklist
Work through this list to identify your specific cause:
- Is the image sharp on your local device? → If yes, the blurriness is introduced by the platform, not your source.
- Check the platform's recommended dimensions → Is your image smaller? If yes, it is being upscaled.
- What format is your source? → PNG = likely safe from JPG artefacts. JPG = may have pre-existing compression artefacts.
- Does the image contain text, logos, or sharp graphics? → If yes, convert to PNG.
- What quality was the source JPG saved at? → If below Q80, the starting point is already degraded.
Platform-Specific Blurriness Notes
- Instagram applies aggressive recompression, especially on Stories. Upload at 1080×1920 for Stories, quality 90+.
- WordPress generates multiple thumbnail sizes and recompresses each one. Set the WordPress JPEG quality to 90 in
functions.php:add_filter('jpeg_quality', function(){ return 90; }) - LinkedIn handles images reasonably well but recompresses on mobile. Upload at 1200×627.
- WhatsApp applies severe compression. Use PNG for images where quality is critical.