Share Card Studio in your browser, no signup

A raw screenshot rarely looks good in a feed - it sits edge to edge, has no depth, and the platform crops it somewhere unfortunate. Share Card Studio wraps it in the things a designer would add anyway: breathing room, a coloured backdrop, a window or phone frame, and a soft shadow that lifts it off the page. Pick 1:1, 4:5, 9:16 or 16:9 and the card is composed at that exact ratio, so nothing important gets cropped. Everything happens on a canvas in your browser - the image is never uploaded.

Most people open this because a photo is too big, in the wrong format, or they do not want to install an editor for a two-minute job.

Share Card Studio is a good fit when announcing a product update with a screenshot that does not look like a bug report.

In plain English

Share Card Studio is built around a few practical wins, not a long feature list:

• Four export ratios sized for Instagram, Stories, X and Open Graph previews.
• macOS, browser and phone frames drawn at export resolution, so they stay crisp.
• Gradient, solid, film-grain and image-blur backdrops - no generic purple gradient.
• Optional caption and a watermark toggle that remembers your choice.
• Copy to clipboard where the browser supports it, otherwise a one-click download.
• Entirely client-side: nothing is uploaded, so private screenshots stay private.

How to run it

1. Add your screenshot. Drag it in, click to browse, or just press Ctrl+V (Cmd+V) to paste straight from your clipboard.
2. Choose a shape and frame. Pick the ratio for where you are posting, then add a macOS window, browser chrome or phone bezel if the shot needs context.
3. Set the mood. Choose a backdrop, then adjust padding, corner radius and shadow. "Image blur" pulls the backdrop colour from your screenshot itself.
4. Download or copy. Export PNG or WebP, or copy the image straight to your clipboard and paste it into a post.

Real situations

• Announcing a product update with a screenshot that does not look like a bug report.
• Turning an app screen into a 9:16 story without letterboxing it.
• Making an Open Graph image so a shared link previews properly.
• Dressing up a chart or dashboard for a slide or a newsletter.

Small habits that help

• Set the backdrop to "Image blur" when the screenshot is colourful - the card picks up its own palette.
• More padding reads as more premium. Around 14-18% is the sweet spot for a feed post.
• The browser frame address bar is editable, which is handy for showing a page URL without exposing a real one.
• "Surprise me" only shuffles tasteful combinations, so it is a fast way to find a starting point.

Skip these

• Exporting a wide 16:9 card for Instagram - use 4:5 there, it takes far more vertical space in the feed.
• Turning the shadow to maximum on a light backdrop, which turns into a grey smudge rather than depth.
• Adding a caption longer than the card can show; it is truncated rather than shrunk, so keep it short.

Does anything leave your device?

Share Card Studio runs in your browser. The file or text you paste stays on your device. There is no account, and nothing is stored on a ToolBox server for this job.

Related tools worth opening next

If this is one step in a longer job, these usually come after it:

• Screenshot Studio - Capture screen regions at Retina quality, annotate like CleanShot, then copy or export PNG/JPG/WEBP/PDF - all in your browser
• Website Screenshot - Capture any web page exactly as a real browser renders it - full page, any screen size, PNG/JPG/WebP/SVG
• Image Compressor - Compress images without losing quality

FAQ

Is my screenshot uploaded anywhere?

No. The card is composed on a canvas inside your browser and the file only exists on your device. There is no server involved at any point.

What size are the exported images?

The longest edge is 1600px, so a 1:1 card is 1600x1600 and a 9:16 story is 900x1600. That is comfortably above what social platforms display.

Why is my HEIC photo rejected?

Browsers cannot decode HEIC, which is what iPhones save by default. Run it through the HEIC to JPG tool first, then bring the JPG back here.

Can I remove the "Made with ToolBox" watermark?

Yes - it is a toggle in the Text section, and your choice is remembered on this device. The export is identical either way.

Should I use PNG or WebP?

PNG for screenshots with text and sharp edges, which is most of them. WebP produces a much smaller file and is fine for photo-heavy cards.

Why does the frame look different from my real window?

The frames are stylised rather than a pixel copy of any operating system, which keeps them legible at small sizes and avoids implying the screenshot came from a specific app.

Open the Share Card Studio when you are ready. It is free, and you do not need an account.