What "best" means here
Privacy-first, browser-only, no upload limits, no watermarks. Anything that uploads your photos to a server is automatically out.
Common sizes for 2026
- Web hero — 1920×1080 or 1200×630
- Instagram square — 1080×1080
- Twitter / Facebook landscape — 1200×630
- Stories / Reels — 1080×1920
- YouTube thumbnail — 1280×720
What to look for
- Aspect-ratio lock — prevents squishing
- Preset sizes — saves typing common dimensions
- Batch mode — resize 20 photos with one settings pass
- Interpolation control — bicubic for photos, nearest-neighbour for pixel art