QRix
Hit exactly 1280×720 — the HD size video platforms and course thumbnails ask for.
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1280×720 is the smallest resolution that still counts as high definition, and it has become the standard upload size for video thumbnails and course-platform cover images because it looks sharp on a phone while staying light enough to load instantly. It is the same 16:9 shape as 1080p at half the pixel count, so a 1920×1080 export scales down to it perfectly with no cropping at all. Coming from a 4:3 or square source is where decisions appear: fill crops to cover the wider frame, fit letterboxes the image against a background colour of your choosing. Because 720p is a downscale for most modern cameras, results here are usually crisper than the same crop pushed up to 1080p.
Yes — it is the minimum recommended size on most video platforms and displays sharply at typical thumbnail dimensions. Use 1920×1080 if you want extra headroom for future zooming or cropping.
Barely. Both are 16:9, so it is a clean proportional downscale with no cropping — downscaling generally looks sharper than upscaling.
A square source is much taller than a 16:9 frame. Fit preserves the whole square and fills the sides with your chosen colour; fill crops the top and bottom instead.
A JPG, with a quality slider so you can trade file size against detail. Keep it at 90 for a thumbnail that still looks untouched.
No. Resizing runs entirely in your browser with the Canvas API, so the file never leaves your device and nothing is stored or transmitted.
It's free, private and works right in your browser — no signup, no watermark.