Turn a snippet into an image worth posting
A screenshot of a code block is the currency of technical communities, and most tools that make one upload your code to a server. This one draws the image in your browser with canvas, so a snippet containing a credential never leaves your machine.
- Rendering
- Canvas, in-browser
- Output
- PNG, 2x resolution
- Uploads
- Never
How to use it
- Paste what you want to show Code, a diff, a JSON payload, a stack trace, a terminal session — anything monospaced. The language is detected so the highlighting matches.
- Style it Pick a theme, an accent colour, a font size and whether to show the window chrome. A title bar is a good place for a filename or a ticket number.
- Download and post The image is generated as a PNG at twice the display resolution, so it stays sharp on a retina screen. A share button opens a post-to-X intent with the image already attached.
Reference
What it works well for
| Content | Why it is worth an image |
|---|---|
| A before and after diff | A diff in an image reads at a glance; in a text post it is a wall of + and − signs |
| A terminal session | Shows the command and the output together, which is the whole point of the terminal |
| A stack trace | A shared trace is the fastest way to ask a question about a bug |
| A configuration block | The exact YAML somebody is asking about, with the comments intact |
Questions people ask
Is my code uploaded anywhere?
No. The image is drawn on a canvas in your browser and downloaded as a blob from that canvas. Open the network panel and you will see the request that loads this page and nothing else.
Can I use this for a diff?
Yes, and it is one of the strongest use cases. Paste the output of git diff and the added and removed lines are highlighted in the classic colours.
What resolution is the exported image?
Twice the on-screen size, so a 900 pixel wide preview exports at 1800 pixels. That keeps the text sharp on a high-density display and when the image is viewed full width on a large monitor.
Can I share directly to X or LinkedIn?
There is a share button that opens a post composer with the image attached where the browser supports it. The native share sheet is used when available, and otherwise the image is downloaded so you can attach it yourself.
Which fonts are used?
The system monospace font, rendered on canvas. That keeps the tool dependency-free and the result consistent with the machine the image was made on.
Is there a limit on how much text I can paste?
The canvas has a finite size, so very long input is trimmed. A few hundred lines renders comfortably, which covers a diff or a stack trace. Beyond that, scroll the source to the part that matters.
Where this earns its keep
Answering a question in a forum or chat
Dropping a rendered snippet into a thread gets an answer far faster than a wall of text, because people read the code and reply to the code.
Documenting a bug report
Attach the image to the issue. The reporter gets to describe the problem in words and you get the exact bytes in a format that cannot be mangled by markdown escaping.
Posting a snippet on a social network
An image of a snippet performs better than a code block in a social timeline, and the code block in a post is usually unreadable on a phone.
Details that catch people out
The image is drawn onto a canvas element using the Canvas 2D API and downloaded with a blob URL. There is no request to a rendering service, no account and no queue. A snippet with a customer name or an API key stays in the tab.
The highlighter looks at the content and picks a syntax mode, which is why a diff gets green and red lines and a JSON payload gets coloured keys. If the detection is wrong, the colours are still readable, they are just not semantic.
The output is the distribution
Every other tool on this site solves a problem and disappears. This one produces an artefact that people post, and each post is an advert for the site. That is the difference between a tool that earns a few impressions and one that earns thousands.
- Everything is rendered locally with canvas.
- Seven themes, a custom accent colour and adjustable padding.
- Exported at 2x so it does not look soft on a retina display.
- No watermark, no sign-up, no waiting for a render queue.
Last reviewed 2026-10-15. Every tool on DevSnap runs entirely in your browser, so whatever you paste here never reaches a server.