Compress Image Size to 40KB
Original Image
Compressed Image
How to Compress Images to 40KB
Step 1 — Upload
Click “Upload Image” or drag and drop a JPEG, PNG, or WEBP file onto the tool. Your file is read locally — it is never sent to any server.
Step 2 — Preview
The image preview loads immediately in your browser. Check the original file size and dimensions displayed below the preview before proceeding.
Step 3 — Compress
Click “Compress to 40KB”. Our algorithm finds the optimal quality setting to reach 40 KB — usually in under 2 seconds, entirely in your browser.
Step 4 — Download
Preview the compressed result and confirm the new file size. Click “Download” to save the 40 KB image to your device instantly — no sign-up required.
What is Reduce Image to 40 KB?
40 KB is a sweet spot for photographic thumbnails in e-commerce product listings, real estate image galleries, and social news feeds. The extra bytes over 30 KB allow colour-critical industries like fashion and food photography to retain accurate hues that drive purchase decisions. Our tool preserves colour fidelity while hitting 40 KB reliably.
When to Use a 40 KB Image
E-commerce Product Thumbnails
Category pages displaying 24 products with 40 KB images each total only 960 KB — far faster than unoptimised product pages.
Real Estate Listing Previews
Property thumbnails in search results need accurate colours to attract clicks. 40 KB allows faithful representation of room lighting and paint colours.
Food Delivery App Dish Photos
Appetising food photography must look accurate on small screens. 40 KB delivers enough quality for textures and colour vibrancy.
News Site Article Cards
Article grid cards on news and media sites look sharp at 40 KB while keeping total page weight manageable.
Tips for Best Results at 40 KB
- 1For product images, maintain a consistent aspect ratio (e.g., 1:1 square) so the thumbnail grid looks neat.
- 2WEBP compresses product photos to 40 KB at noticeably higher quality than JPEG at the same size.
- 3Batch-process your entire product catalog using our Bulk Compressor to save time.
Frequently Asked Questions — 40 KB Image Compression
Will 40 KB images look good on Retina displays?
To look sharp on 2× Retina screens, serve 2× resolution images at ~80 KB via srcset, and use 40 KB as the 1× fallback.
Is 40 KB suitable for hero banner images?
Hero banners are usually full-width and need 80–150 KB for good quality. Use 40 KB for thumbnails and secondary images, not large hero sections.