Image File Size Estimator
See roughly how many kilobytes your image will weigh in JPG, WebP, AVIF and PNG before you convert it.
Updated May 2026 · Free · Works entirely in your browser
These are estimates based on typical compression rates. Detailed photos come out larger, flat graphics smaller.
Sensible targets
- Email attachment: keep each photo under 1 MB and the whole message under 10 MB.
- Web page hero image: aim for 150–250 KB in WebP.
- Product listing photo: 200–500 KB in JPG at 2000 px on the long edge.
- Blog body image: 60–120 KB is usually plenty.
The fastest way to shrink a file
Resize before you compress. Halving the width and height cuts the pixel count by four, which usually saves far more space than dropping quality — and unlike heavy compression it does not introduce blocky artefacts.
Gear we recommend for this workflow
As an Amazon Associate we earn from qualifying purchases. Affiliate disclosure.
3 Months to No.1: The "No-Nonsense" SEO Playbook for Getting Your Website Found on Google
Best for optimizing your site's search visibility
$13.97
Check price on Amazon
Samsung T7 Shield Portable SSD 1TB, USB 3.2 Gen 2, Up to 1,050 MB/s | Rugged, IP65 Water Resistant, External Solid State Drive for Photographers, Content Creators and Gaming (MU-PE1T0S/AM), Black
Best for photographers backing up thousands of RAW files
$267.00
Check price on Amazon
BenQ PD2706U Mac-Ready Monitor 27” 4K UHD, 90W USB-C, 99% sRGB, 95% P3, DeltaE ≤3, DisplayHDR 400, IPS, AQCOLOR, Factory-Calibrated, Uniformity, HotKey Puck, Ergonomic, DisplayPort, KVM, USB Hub
Best for accurate color when editing photos
$399.99
Check price on Amazon
Anker USB C Hub, 5-in-1 USBC to HDMI Splitter with 4K Display | 85W Max PD, 1 Powered USB-C 5Gbps & 2 Powered USB-A 3.0 5Gbps Data Ports, for MacBook Pro, MacBook Air, Dell and More (Black)
Best for connecting cards, drives and displays
$18.99
Check price on AmazonPrices as of Oct 22, 2026, 4:41 AM UTC. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Frequently Asked Questions
Everything you need to know about image conversion.