Free Image Size Checker

No. The tool uses URL.createObjectURL to read your image locally — your image is never sent to our servers and we never see it. You can verify this by opening the Network tab in DevTools while you inspect an image.

On iPhone, open Photos, tap an image, and swipe up to see dimensions. On Mac, right-click in Finder → Get Info. On Windows, right-click in File Explorer → Properties → Details. The fastest method on any device is to drop the image into this tool — it works in any browser without installing anything.

For the feed, 1080×1080 px (square) or 1080×1350 px (4:5 portrait — the default profile-grid format since January 2025). For Stories and Reels, 1080×1920 px (9:16). The cheatsheet below covers every Instagram surface.

Resolution is how many pixels the image contains (e.g. 1920×1080) — it controls sharpness. File size is how many bytes the image takes up on disk — it depends on resolution, format, and compression. A 4 MB JPG and a 4 MB WebP can have very different resolutions because WebP compresses about 30% better than JPG at equivalent visual quality.

Either the resolution is below the platform's recommendation (so the platform upscales it and adds blur) or the platform recompresses it heavily on upload. Check this tool — if the dimensions or aspect ratio show Fail or Warn for the surface you're posting to, that's why.

Instagram feed: 1:1 or 4:5. Stories/Reels/TikTok/Shorts/Snapchat: 9:16. YouTube thumbnails and Twitter/X in-stream: 16:9. LinkedIn and Facebook posts: 1.91:1. Pinterest pins: 2:3 vertical. The cheatsheet section breaks down every surface.

Most platforms accept JPG and PNG everywhere. Instagram, X, and LinkedIn now also accept WebP. AVIF support is still spotty. HEIC (iPhone default) is silently converted on upload by most apps but may fail on direct uploads — convert to JPG first to avoid surprises. The cheatsheet shows the accepted formats per surface.

Yes — drop several images in at the same time. Each gets its own inspection card and a sortable summary table appears for bulk comparison. You can export the table as CSV with a single click.

Every spec in the cheatsheet has a `lastVerified` field tied to the official platform documentation. We refresh the data every six months — last reviewed April 2026.

Instagram accepts three feed formats. Square is 1080×1080 px (1:1). Portrait is 1080×1350 px (4:5) — this has been the default profile-grid format since January 2025 and gets the most organic reach. Landscape is 1080×566 px (1.91:1) but centre-crops to 4:5 on the profile grid.

Instagram Stories are 1080×1920 px in a 9:16 vertical aspect ratio (the same frame as Reels). Image uploads cap at 30 MB; Story videos use a separate, much higher cap (up to ~4 GB on mobile). Keep important visuals inside the centre safe-zone — the top and bottom 250 px get covered by the profile sticker, reply box, and UI overlays.

1080×1920 px, 9:16 vertical, for both the video and its cover image. File size limits differ by media type: Reel videos can be up to ~4 GB on mobile (around 1 GB on web), while the cover image (the still uploaded with the Reel) caps at 30 MB. Design the cover frame to read clearly at thumbnail size — it crops to a 1:1 square on the profile grid.

Upload at 1640×859 px in a 1.91:1 ratio for the sharpest result on every device. Facebook displays it at 820×312 px on desktop and 640×360 px on mobile, so render any text inside a centred safe area to avoid cropping. JPG and PNG are both fine; the file-size cap is 100 MB but most uploads stay under 1 MB.

Same as a Facebook cover photo: 1640×859 px (1.91:1) is the recommended upload size. The desktop display is 820×312 px and mobile is 640×360 px. Keep your logo and headline within ~640 px of the centre so nothing gets clipped on either device.

LinkedIn personal profile banners are 1584×396 px in a 4:1 aspect ratio. The file must be JPG or PNG and under 8 MB. Note that your profile photo overlaps the bottom-left of the banner — keep that corner clear of text. LinkedIn Company page covers are 1128×191 px.

LinkedIn feed posts use 1200×627 px in a 1.91:1 ratio for single images. Document carousels (PDF posts) use 1080×1080 px square slides. Maximum file size is 5 MB. JPG, PNG, and GIF are accepted.

1280×720 px in a 16:9 aspect ratio is the recommended size. YouTube enforces a hard 2 MB file-size cap on custom thumbnails, which is the most common upload failure on the platform — compress JPG quality to ~80% if you hit the limit.

2560×1440 px in 16:9, with a 1546×423 px centred safe area that displays uniformly across phone, desktop, and TV. The file must be under 6 MB. Anything outside the safe area only shows on TV displays — keep your logo and copy inside it.

YouTube Shorts use 1080×1920 px in a 9:16 vertical aspect ratio, identical to Instagram Reels and TikTok. Shorts up to 60 seconds, max file size 256 MB. Vertical 9:16 video posted as a regular YouTube upload is automatically eligible for the Shorts shelf if under 60 seconds.

TikTok videos are 1080×1920 px in a 9:16 vertical aspect ratio. Maximum file size is 287 MB on mobile uploads, higher on desktop. The cover thumbnail crops to 9:16 on the profile grid — view counts overlay the bottom-left corner, so keep that area clear of text.

1500×500 px in a 3:1 aspect ratio is the recommended X header size. JPG or PNG, file under 5 MB. Your profile photo overlaps the bottom-left of the header — keep that corner clear of text or your logo.

Pinterest standard pins are 1000×1500 px in a 2:3 vertical aspect ratio — this is the format the Pinterest algorithm rewards in feed and search results. Long pins (Idea Pins) can extend to 1000×2100 px (1:2.1). Maximum file size is 32 MB. JPG, PNG, and WebP are all accepted.

Pinterest board covers are 600×600 px square (1:1 aspect ratio), under 10 MB, JPG or PNG. The cover is the first pin you choose to feature on a board — pick a pin that already exists on the board rather than uploading a new image.

Bluesky banners are 1500×500 px in a 3:1 aspect ratio, identical proportions to X. The hard part is the 1 MB per-image limit Bluesky enforces across all images — a banner often needs JPG quality dropped to ~75% or a WebP convert to fit.

Bluesky feed images are recommended at 1200×630 px (1.91:1), but Bluesky enforces a 1 MB hard file-size limit on every image. That limit, not dimensions, is what trips up most uploads — compress JPGs to 75–80% quality or convert to WebP to stay under it.

Threads feed images use 1080×1350 px in a 4:5 aspect ratio (the same default as Instagram). Threads also accepts 1:1 square (1080×1080) and 1.91:1 landscape (1080×566). Maximum file size is 30 MB.

Snapchat Snaps and Spotlight content are 1080×1920 px in a 9:16 vertical aspect ratio. Maximum file size is 32 MB on uploads. The same dimensions apply to Stories and Spotlight — Snapchat does not have a separate landscape format for any user-facing surface.