# Launch Image Size Checker

Free browser checker at https://premiumlauncher.com/tools/launch-image-size-checker.

Select images locally. The page shows width, height, aspect ratio, file size, and type, then compares each file with published asset specs. Files are not uploaded.

Checked October 2026. If a platform page does not publish a figure, the row says not stated. If two official pages disagree, both are listed.

## Product Hunt thumbnail (Help Center)
- Dimensions: Square is described as best. 240×240 is recommended.
- Aspect ratio: Square. No other ratio is stated.
- File size: A GIF thumbnail must be under 3MB. A file-size cap for other thumbnail types is not stated.
- Types: GIF is named. Other types are not stated.
- Note: Help Center article dated May 28, 2025. GIFs animate on hover. Strobing GIFs may be edited.
- Source: [Product Hunt Help Center](https://help.producthunt.com/en/articles/479557-how-to-post-a-product)

## Product Hunt thumbnail (launch guide)
- Dimensions: Use square dimensions. 240×240 is recommended.
- Aspect ratio: Square. No other ratio is stated.
- File size: All thumbnail images, GIF or not, need to be under 3MB. That sentence is in the thumbnail section.
- Types: GIF is discussed. A full type list is not stated.
- Note: This file-size line is wider than the Help Center, which states 3MB for GIF thumbnails only.
- Source: [Product Hunt launch guide](https://www.producthunt.com/launch/preparing-for-launch)

## Product Hunt gallery
- Dimensions: 1270×760 recommended. No minimum or maximum is stated.
- Aspect ratio: Not stated. 1270×760 reduces to 127:76.
- File size: Not stated on the gallery section.
- Types: Not stated. The launch guide says animated GIFs can be used.
- Note: Both pages say the gallery needs 2 or more images before it is viewable. That is a count of images on the post.
- Source: [Product Hunt Help Center](https://help.producthunt.com/en/articles/479557-how-to-post-a-product), [Product Hunt launch guide](https://www.producthunt.com/launch/preparing-for-launch)

## Open Graph image
- Dimensions: Not stated. og:image:width and og:image:height are optional.
- Aspect ratio: Not stated.
- File size: Not stated.
- Types: Not stated. og:image:type is an optional MIME type.
- Note: og:image is a URL. The protocol page's example image is 400×300, which is an example, not a requirement.
- Source: [Open Graph protocol](https://ogp.me/)

## Facebook link-share image
- Dimensions: Minimum allowed 200×200. At least 1200×630 for the best display on high-resolution devices. At least 600×315 for a larger link image. Smaller than 600×315 still displays, but much smaller.
- Aspect ratio: Keep the image as close to 1.91:1 as possible. 1200×630 is 40:21, about 1.905:1, so the named ratio and the pixel size on this page are not the same.
- File size: Must not exceed 8 MB. The page does not define MB.
- Types: The webmaster guide says og:image:type is one of image/jpeg, image/gif, or image/png.
- Note: The best-practices page publishes different width numbers. Both are listed.
- Source: [Facebook link-share images](https://developers.facebook.com/documentation/sharing/webmasters/images), [Facebook sharing for webmasters](https://developers.facebook.com/documentation/sharing/webmasters)

## Facebook sharing best practices
- Dimensions: At least 1080 pixels wide for the best display on high-resolution devices. At least 600 pixels wide for image link ads. Height is not stated for those two lines.
- Aspect ratio: 1:1 is recommended for image link ad creatives. A feed ratio is not stated on this page.
- File size: Not stated.
- Types: Not stated on this page.
- Note: This disagrees with the link-share images page, which says 1200×630 and 1.91:1.
- Source: [Facebook sharing best practices](https://developers.facebook.com/documentation/sharing/best-practices)

## Facebook game app images
- Dimensions: Open Graph story images should be 600×600. The other example given is 600×314.
- Aspect ratio: Story images are square. Other game images should be 1.91:1, such as 600×314.
- File size: Not stated.
- Types: Not stated.
- Note: This subsection is for game apps. 600×314 is an example of 1.91:1, and 600÷314 is about 1.911.
- Source: [Facebook sharing best practices](https://developers.facebook.com/documentation/sharing/best-practices)

## X summary_large_image card
- Dimensions: Not stated.
- Aspect ratio: Not stated.
- File size: Not stated.
- Types: Not stated.
- Note: The old card guide URL redirects to the X docs home. docs.x.com has no summary_large_image image-size page in its sitemap. Post upload limits below are a different spec.
- Source: [X for websites overview](https://docs.x.com/x-for-websites/overview)

## X post or DM image
- Dimensions: Not stated for still images.
- Aspect ratio: Not stated for still images.
- File size: Images are 5 MB or under. The page does not define MB. Default and Premium accounts use the same image cap.
- Types: JPG, PNG, GIF, WEBP.
- Note: A post can include up to 4 photos, 1 animated GIF, or 1 video. Animated GIFs are a separate row.
- Source: [X media best practices](https://docs.x.com/x-api/media/quickstart/best-practices), [X media upload](https://docs.x.com/x-api/media/introduction)

## X animated GIF
- Dimensions: Recommendation: resolution at or under 1280×1080 (width × height), 350 frames or fewer, and width × height × frames at or under 300 million.
- Aspect ratio: Not stated.
- File size: 15 MB or under. The page does not define MB. A GIF can still fail at post creation inside that size.
- Types: GIF, listed separately from still images.
- Note: The 1280×1080, frame, and pixel-count lines are recommendations. The 15 MB line is in the image criteria list.
- Source: [X media best practices](https://docs.x.com/x-api/media/quickstart/best-practices)

## LinkedIn sharing module
- Dimensions: Minimum 1200×627. Images less than 401 pixels wide display as a thumbnail.
- Aspect ratio: Recommended ratio 1.91:1. 1200÷627 is about 1.914, so the named ratio and the pixel minimum are not identical.
- File size: Max 5 MB. The page does not define MB.
- Types: Not stated for the sharing module. JPG, PNG, and GIF are listed under single image ads on the same page.
- Note: The Page preview article uses a 200px width floor instead of 401px, and it does not set 1200×627 as a minimum.
- Source: [LinkedIn sharing module](https://www.linkedin.com/help/linkedin/answer/a521928)

## LinkedIn Page link preview
- Dimensions: Use 1200×627. Width must be more than 200 pixels. Under 200 pixels wide, it displays as a thumbnail.
- Aspect ratio: 1.91:1 (1200×627). Other ratios show in full on mobile, with white padding. Desktop cropping is not given a separate pixel rule.
- File size: Not stated.
- Types: Not stated.
- Note: The help page says it was last updated 2 years ago. It disagrees with the sharing-module minimum and the 401px thumbnail line.
- Source: [LinkedIn Page post preview](https://www.linkedin.com/help/linkedin/answer/a566445)

## LinkedIn photo upload
- Dimensions: At least 552×276. Recommended width is 1080 pixels. A recommended height is not stated.
- Aspect ratio: From 3:1 to 4:5 (width:height). If the ratio is larger, the image is centered and cropped to the max ratio.
- File size: 5 MB upload limit. The page does not define MB.
- Types: Not stated.
- Note: This is an uploaded photo, not the link-preview image. A post can hold up to 20 photos. The page says it was last updated 2 years ago.
- Source: [LinkedIn photo posts](https://www.linkedin.com/help/lms/answer/a527229)

## LinkedIn single image ad
- Dimensions: Maximum 7680×4320. Landscape minimum 640×360, maximum 7680×4320. Square minimum 360×360, maximum 4320×4320. Vertical minimum 360×640, maximum 2340×4320.
- Aspect ratio: Landscape recommended 1.91:1. Square 1:1. Vertical recommended 1:1.91.
- File size: Maximum 5 MB. The page does not define MB.
- Types: JPG, PNG, or GIF. Animated GIFs must be 300 frames or shorter.
- Note: Square and vertical images might be cropped when ads are shared organically. Same help article as the sharing module.
- Source: [LinkedIn sharing module](https://www.linkedin.com/help/linkedin/answer/a521928)

## Pinterest image Pin
- Dimensions: Not stated.
- Aspect ratio: Not stated for image Pins. Video Pins on the same page do list ratios.
- File size: Web: 20 MB maximum. Android and iOS: 1 GB recommended. The page does not define MB.
- Types: BMP, JPEG, PNG, TIFF, WEBP.
- Note: Safe-zone insets are published (top 270, left 65, right 195, bottom 790) without a canvas size, so they are not converted into a width and height.
- Source: [Pinterest Pin specs](https://help.pinterest.com/en/article/review-pin-specs)

## Pinterest standard image ad
- Dimensions: 1000×1500 is the recommended size.
- Aspect ratio: 2:3 is recommended. An aspect ratio greater than 2:3 might get cut off in feeds.
- File size: Desktop 20 MB maximum. In-app 32 MB maximum. The page does not define MB.
- Types: PNG or JPEG.
- Note: Other ad formats on this page (carousel, collections, idea, quiz) are not separate rows here.
- Source: [Pinterest ad specs](https://help.pinterest.com/en/business/article/pinterest-product-specs)

## Mastodon image (English guide)
- Dimensions: Images are downscaled to 8.3 megapixels, described as enough for 3840×2160.
- Aspect ratio: Not stated.
- File size: Up to 16MB. The page does not define MB.
- Types: PNG, JPG, HEIF, WEBP, AVIF. Up to 4 images per post.
- Note: English page last updated July 8, 2026. GIF files are a separate row. The Japanese translation still publishes older numbers.
- Source: [Mastodon posting guide (English)](https://docs.joinmastodon.org/user/posting/)

## Mastodon GIF (English guide)
- Dimensions: GIF dimensions must be less than 1MP. The page puts 1280×720 in parentheses.
- Aspect ratio: Not stated.
- File size: Up to 16MB. The page does not define MB.
- Types: GIF. Static GIFs use the same limits as animated GIFs. One animated GIF per post.
- Note: 1280×720 is 921,600 pixels, which is under 1,000,000. The checker uses less than 1,000,000 pixels for the 1MP line.
- Source: [Mastodon posting guide (English)](https://docs.joinmastodon.org/user/posting/)

## Mastodon image (Japanese guide)
- Dimensions: Downscaled to 1.6 megapixels. The page says that is enough for a 1280×1280 image.
- Aspect ratio: Not stated.
- File size: Up to 8MB. The page does not define MB.
- Types: PNG, JPG, GIF. Up to 4 images.
- Note: Japanese page last updated January 31, 2025. 1280×1280 is 1,638,400 pixels, which is more than 1,600,000. Both figures are on that sentence.
- Source: [Mastodon posting guide (Japanese)](https://docs.joinmastodon.org/ja/user/posting/)

## Bluesky post image
- Dimensions: Not stated on the posts guide.
- Aspect ratio: The embed stores the image's own aspect ratio. No required ratio is stated.
- File size: The prose says 1,000,000 bytes. The code sample on the same page rejects files over 2,000,000 bytes. Both are shown.
- Types: Not stated as a list. The sample upload uses image/png.
- Note: Up to four images per post. The lexicon file that the guide cites was not available at the published GitHub path when this page was checked.
- Source: [Bluesky posts guide](https://docs.bsky.app/docs/advanced-guides/posts)

## Slack classic unfurl
- Dimensions: Not stated.
- Aspect ratio: Not stated.
- File size: Not stated.
- Types: Not stated.
- Note: Slack crawls Open Graph and X card metadata for a classic unfurl. It does not publish its own pixel size.
- Source: [Slack link unfurling](https://docs.slack.dev/messaging/unfurling-links-in-messages)

HTML: https://premiumlauncher.com/tools/launch-image-size-checker