Compress Image to 300KB
300KB delivers high-quality visuals that still load fast on mobile. SizeSnap compresses your image to precisely 300KB for the perfect web-performance balance.
Target file size
300KB
Unlike TinyJPG or Squoosh, SizeSnap lets you specify the exact target size — not just “smaller.”
How to Compress an Image to 300KB
- 1
Upload your portfolio image, store banner, or blog hero to SizeSnap.
- 2
Enter 300 as the target size and select KB.
- 3
Press Compress — SizeSnap optimizes quality to land exactly at 300KB.
- 4
Download and publish to your portfolio, storefront, or content platform.
Why Compress to 300KB?
Squarespace and Webflow portfolio pages look best with images between 200KB and 400KB — 300KB is the midpoint that keeps galleries snappy on mobile while preserving the color gradients and fine detail that photographers and designers need. Shopify store banners and promotional hero images at 300KB maintain visual impact without penalizing mobile Core Web Vitals scores. Medium and Substack post images at 300KB load quickly in feeds while retaining enough quality for readers who click to view full-size. Google Ads display banners and Meta (Facebook) ad creatives also benefit from this target — the images are rich enough to drive engagement but lean enough for fast ad rendering across placements.
Tips for Compressing to 300KB
For portfolio sites, compress to 300KB per image and use lazy loading for below-the-fold gallery items to keep initial page load under 2 seconds.
Shopify banners at 300KB and 1920px wide look sharp on desktop while loading quickly on mobile.
If you are running Google or Meta ad campaigns, 300KB creatives upload faster and serve more reliably across global ad networks.
Frequently Asked Questions
- Is compressing to 300KB free?
- Yes, SizeSnap is free for up to 3 compressions per day. No account needed.
- Does SizeSnap work on mobile?
- Yes, SizeSnap runs entirely in your browser and works on any device — iPhone, Android, tablet, or desktop.
- Will my image lose quality when compressed to 300KB?
- SizeSnap uses smart compression that minimizes visible quality loss. For 300KB, most images retain excellent quality at this size.
- What image formats are supported?
- SizeSnap supports JPEG, PNG, WebP, and HEIC images. All formats can be compressed to exactly 300KB.