Compress BMP Images for Medium
Medium's editor displays images at up to 1400px wide. Properly optimized feature images make articles look professional and load quickly for readers on all devices. Uncompressed Windows bitmap format with very large file sizes. Not suitable for web use without compression. Use ImageSmith to compress your BMP images to the ideal file size for Medium — target under 25,000KB for optimal performance. Processing is fully browser-based — no server uploads, no privacy risk.
Recommended format
JPEG
Max file size
25,000KB
Dimensions
1400×933 for article feature images
✓Feature images display at up to 1400px wide — optimize to this width
✓Target under 500KB for article images to maintain fast reading speed
✓PNG for diagrams and screenshots, JPEG for photographs
✓Medium applies light additional compression on upload