Compress HEIC Images for YouTube
YouTube thumbnails are the single most impactful factor in video click-through rate. Compressed, well-sized thumbnails load quickly and display crisply across all devices. High Efficiency Image Format — the default photo format on iPhones and modern Apple devices. Excellent compression. Use ImageSmith to compress your HEIC images to the ideal file size for YouTube — target under 2,048KB for optimal performance. Processing is fully browser-based — no server uploads, no privacy risk.
Recommended format
JPEG
Max file size
2,048KB
Dimensions
1280×720 (thumbnails), 2560×1440 (channel art)
✓Custom thumbnails must be under 2MB file size
✓Use 1280×720 pixels — displayed at various sizes across devices
✓High contrast with bold, readable text increases click-through rate
✓Bright, saturated colors stand out in recommendation feeds