Free tools for design files
A file that looks fine on screen can still be rejected: a thumbnail over the size limit, a product photo that is not white enough, a print file at too low a resolution. These tools check the part that has numbers in it. They run in your browser, they do not ask you to sign in, and the files you check are never uploaded.
Every number comes from the PiCraft size guides, which link the official page each figure was checked against.
Size guides behind the checker
Read these when you want the reasons behind a number.
YouTube Thumbnail Size and Requirements
The right YouTube thumbnail size: 1280×720 px works for most uploads, 3840×2160 px is the maximum recommended. Aspect ratio, file limits, Shorts and safe area.
Size guideLinkedIn Profile Banner Size and Safe Area
LinkedIn profile banner size is 1584×396 px (4:1), JPG or PNG, under 8 MB. Where your photo overlaps, mobile crop, and why company pages use 1512×256 px.
Size guideEvent Flyer Size for Print and Social Media
Event flyer sizes: US Letter 8.5×11 in with bleed for print, 1080×1350 px feed posts, 1080×1920 px Stories, and A4 dimensions in millimeters.
Size guideBusiness Card Size, Bleed and Print Resolution
US business cards are 3.5×2 in; Europe often uses 85×55 mm. Bleed, safe zones, 300 DPI pixel sizes, landscape layout, and matching your printer template.
Size guideWedding Invitation Size and Print Specs
Standard wedding invitation size is 5×7 in with 0.125 in bleed, 300 DPI and an A7 envelope. Trim, safe area, pixels, card stock and share-image sizes.
Size guideRestaurant Menu Print Size and Layout Limits
Restaurant menu size for print: US Letter 8.5×11 in or A4 with bleed, 300 DPI specs, about 14 lines per page, web JPG sizes, and local allergen rules to check.