Development
JWT Decoder
Read a JWT's header, payload and dates, and check its signature.
See how your page will look when shared on Google, Facebook, X, LinkedIn, WhatsApp, Slack, Discord or Pinterest, fix what gets cut off, and copy ready-to-paste Open Graph tags.
Fill in the form, or import it from the code of a page.
JPG, PNG, WebP or GIF. The picked image is only used for the preview: give its online address too, for the code.
A simulation of each platform: the real result may vary slightly, but the cuts are close to reality.
Pinterest shows the whole image, without cropping it. A vertical image (2:3, for example 1000 × 1500 px) takes more room there, but will be cropped elsewhere.
What to fix, then the tags to paste into your page.
Paste it in the head section of your page.
Fill in the form to generate the code.
Every time someone shares your page, a network shows a card with its title, its description and its image. This tool shows those cards before you publish, and writes the tags that feed them.
When your page is shared, each network shows a card with a title, a description and an image. That information comes from the Open Graph tags placed in the code of the page. Without them, the card is empty or badly chosen.
Google cuts a title around 60 characters and a description around 155. An image of 1200 × 630 pixels (1.91:1) looks good everywhere: keep the essentials in the center, as some platforms crop it. Pinterest prefers a vertical image.
Copy the HTML tags to place in the head of your page, or the metadata object for a Next.js site. After going live, networks sometimes keep the old preview in their cache for a few days.
The previews are simulated in your browser. Your image and your texts are sent nowhere. The only request is the one for an image address you type, made by your browser.
Development
Read a JWT's header, payload and dates, and check its signature.
Development
Convert timestamps, durations and date gaps.
Development
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Create and download a QR code.