What Video Resolution Means for Screenshots
When we say a video is "1080p" or "4K," we are describing the number of pixels in each individual frame. A 1080p video has frames that are 1920×1080 pixels — about 2 megapixels per frame. A 4K video has frames that are 3840×2160 pixels — about 8 megapixels per frame. For screenshots, resolution translates directly into detail: more pixels means you can crop and zoom without the result looking pixelated, text in the frame is more readable, and the image can be printed at larger sizes without quality loss.
Common Video Resolutions and Screenshot Sizes
- 480p (SD): 854×480 — suitable only for small web thumbnails
- 720p (HD): 1280×720 — acceptable for social media, inadequate for print
- 1080p (Full HD): 1920×1080 — standard quality, suitable for most uses
- 1440p (2K/QHD): 2560×1440 — excellent quality for high-end monitors
- 2160p (4K UHD): 3840×2160 — professional quality, suitable for large print
How Screenshots Online Determines Your Screenshot Resolution
When you load a video file, the browser's decoder reads the file's native resolution directly from the metadata. Screenshots Online captures frames at this exact native resolution by default (the "Original 1x" setting). A 1080p video produces a 1920×1080 screenshot. A 4K video produces a 3840×2160 screenshot. The quality setting in the tool can upscale this further, but upscaled pixels are interpolated — they do not add real detail from the source.
Getting True 4K Screenshots
To get screenshots with genuine 4K detail, you need a source video file that was actually recorded or exported at 3840×2160 resolution. Check your video's properties (right-click → Properties on Windows, or Get Info on Mac) to confirm its resolution before uploading. Then use the "Original (1x)" quality setting in Screenshots Online to capture at the file's true native resolution.
Expected File Sizes
- 720p PNG: approximately 0.8–2 MB per frame
- 1080p PNG: approximately 2–5 MB per frame
- 1080p JPEG (95%): approximately 200–500 KB per frame
- 4K PNG: approximately 8–20 MB per frame
- 4K JPEG (95%): approximately 1–3 MB per frame
For web publishing, JPEG at 95% quality provides an excellent balance of quality and file size. For print and archival, always use PNG. When in doubt, PNG is the safe default — you can always convert to JPEG later, but you cannot recover quality lost during JPEG compression.