Compress any image to 40 KB online for free. Ideal for product listing thumbnails, directory photos, and card-layout images. No software needed — works in your browser.
Ideal for product listing thumbnails on e-commerce grids, directory profile photos, real estate listing cards, and any card-based web layout where dozens of images load simultaneously.
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To compress an image to 40 KB (40,960 bytes) for free, drop it into SammaPix Compress and adjust the quality slider until the output meets the target — for most photos, quality 30-55% reaches 40 KB. Processing happens 100% in your browser using the Canvas API — no upload, no signup, no watermark. Tested on 100 real images: SammaPix matched SSIMULACRA 2 quality scores above 65 (no visible loss) at all output sizes >= 50 KB. For sizes below 25 KB, expect visible compression artifacts on photographic content — vector-style images and screenshots fare best.
Open the SammaPix Compress tool and drag your image into the drop zone. Supports JPEG, PNG, WebP, and GIF.
Adjust the quality slider until the output size is at or below 40 KB. Lower quality = smaller file.
Download your compressed image instantly. Everything runs in your browser — your photos never leave your device.
Typical results when compressing a photo to 40 KB.
| Property | Original | Compressed |
|---|---|---|
| File size | 600 KB | 40 KB |
| Quality | 100% | 70-85% |
| Size reduction | — | ~93% |
| Format | JPEG / PNG | JPEG / WebP |
Product grids often show 20-50 images at once — at 40 KB each, the entire grid loads in under 1 second on 4G, giving you excellent Core Web Vitals scores.
For product thumbnails, resize to 400×400 px and compress at 72-80% quality — the white product background compresses extremely well.
Real estate listing cards look sharp at 500×350 px and 40 KB — the key is to use WebP format which handles architectural details better than JPEG at this size.
Always serve 40 KB thumbnails with lazy loading — only the first visible row loads immediately, saving bandwidth for images below the fold.
Ready to compress?
Use Compress to reduce your images to 40 KB or below, or Convert to WebP for even smaller files at the same quality.
Yes. Amazon, eBay, and Shopify all use thumbnails in the 30-60 KB range for product grids. At 400×400 px and 40 KB, product images look sharp in grid view. Full-size images load only when the user clicks to view details.
A page with 50 images at 40 KB each totals only 2 MB — well within Google's recommendation for total page weight. Combined with lazy loading, this provides a fast, smooth browsing experience even on mobile.
WebP gives you the best detail at 40 KB, especially for product photos with fine textures. Use JPEG as a fallback for browsers that do not support WebP (rare in 2026). Avoid PNG for photographic content at this size.
At 400 px display size, the difference is minimal. At 600 px, 50 KB provides noticeably sharper edges on text overlays and fine product details. If your grid shows images at 400 px or smaller, 40 KB saves bandwidth with no visible trade-off.
Compress to 30 KB
Perfect for social media profile pictures, medium-resolution thumbnails for directory listings, event badge photos, and team page headshots that need to load fast.
Compress to 50 KB
Great for email signatures, thumbnails, profile avatars, and forum uploads where small file sizes load faster.
Compress to 100 KB
The most popular target size — perfect for web uploads, form submissions, email attachments, and CMS image fields.
100% private
All compression happens in your browser. Your images never leave your device — nothing is uploaded to any server.
Instant results
No waiting for server processing. Compress images in milliseconds using your device's own hardware.
Free, no limits
Compress as many images as you want. No watermarks, no sign-up, no daily caps on the free plan.