Superbridger

Free tools

Free tools for posting everywhere

The checks Superbridger runs before every post, free for anyone: see if a video or a caption will post on each platform, look up the limits, resize images, check safe zones and tag your links. No sign-up, and your files stay in your browser.

  • Free, no sign-up
  • Files stay in your browser
  • The same checks as the app
  • Usable from AI apps

The tools

  • Video checker

    Will your video post on Reels, TikTok, Shorts, LinkedIn and X? Length, size, shape, codec and sound, per platform.

    Open

  • Caption checker

    One caption against every platform's limit, counted the way each one counts: X's 280, Instagram's 5 hashtags, YouTube's title.

    Open

  • Social media specs

    Every limit in one dated table: video length and size, caption length, hashtags, photos and Stories. Also as JSON.

    Open

  • Image resizer

    Crop an image to the right size for each platform: posts, Stories, banners and thumbnails. In your browser.

    Open

  • Safe zone checker

    See where the buttons and captions of Reels, TikTok and Shorts cover your video, before you post.

    Open

  • UTM builder

    Tag a link for every platform at once, so your analytics show which post brought the visitors.

    Open

Why these tools

  • The app's own checks

    The video and caption checkers run the rules Superbridger runs before it publishes, so what passes here passes there.

  • Your files stay with you

    Videos and images are read in your browser. Nothing is uploaded, so even a large video is checked in seconds.

  • Dated and sourced

    Every page says when its facts were checked. Image sizes and safe zones link to the platform's own page they come from.

  • Made for AI apps too

    AI apps can't count characters exactly or open a video file. They can call these checks through a free API and MCP server, without an account.

Use the tools from an AI app

Every check is also a free API and a free MCP server. An AI app can count a caption the way X does, check a video's numbers or look up a platform's limits, without an account or a key.

The toolsAPIMCP server
Video checkerPOST /api/tools/check-videocheck_video
Caption checkerPOST /api/tools/check-captioncheck_caption
Social media specsGET /api/tools/specsget_platform_specs
Image resizerGET /api/tools/image-sizesget_image_sizes
Safe zone checkerGET /api/tools/safe-zonesget_safe_zones
UTM builderGET /api/tools/utmbuild_utm_links
MCP server
https://superbridger.com/api/tools/mcp
Add https://superbridger.com/api/tools/mcp as a custom connector in Claude, or as an app in ChatGPT. No sign-in.
API
https://superbridger.com/api/tools
JSON in, JSON out, open to any site (CORS). The OpenAPI description lists every endpoint.

OpenAPIReference for AI apps (Markdown)

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Superbridger runs these checks before every post, then publishes to every platform at once.