Claude Code is a terminal-based AI coding assistant that outputs plain text in a console, and it does not render images natively. To turn the snippets Claude Code produces into a shareable PNG, paste the complete code text into the Code to Image Generator, pick a light or dark theme with a font size between 12 and 32 pixels and padding between 16 and 96 pixels, and download the resulting code-image.png. The whole pipeline runs in the current browser tab on inert text, so the source is never parsed, compiled, evaluated, highlighted, or sent to a remote server, and the exported PNG stores rendered pixels rather than editable source. Input is bounded by 50,000 UTF-16 code units, 200 logical lines, 2,000 code units on any single line, 8,192 pixels per Canvas edge, 32,000,000 total Canvas pixels, and a 20 MiB PNG, and over-limit input is rejected with an explicit error rather than silently cropped or partially rendered.
Why Claude Code Output Needs a Separate Image Step
Claude Code runs as an interactive terminal agent. Its responses arrive as text in the shell: file diffs, command suggestions, full functions, regex patterns, SQL queries, configuration blocks, and small scripts. None of that text becomes a graphic inside the terminal itself. When developers want to drop one of those snippets into a pull request description, a Notion page, a Confluence article, a blog post, a Stack Overflow answer, a tweet, a slide deck, or a chat thread that does not render monospace code blocks nicely, a PNG is the most portable container.
Snipping the terminal window is one option, but it captures the surrounding prompt, the cursor, the window chrome, your color theme, and any unrelated lines that happened to scroll by. A second option is to copy the code from the terminal, paste it into a dedicated renderer, and let that renderer produce a tightly bounded image with controlled typography and padding. The Code to Image Generator is built for that second path: a single browser tab that takes a chunk of inert text, draws it on a Canvas, and hands back a PNG without ever leaving your machine.
Inside the Code to Image Generator: Local PNG Rendering
The tool runs entirely in your current browser tab. Nothing is uploaded, no external renderer is called, and no syntax-highlighting grammar or language runtime is loaded. The only inputs are the text you paste and three fixed controls: theme (light or dark), font size in whole pixels from 12 through 32, and padding in whole pixels from 16 through 96.
Under the hood, the browser is asked to set the local monospace font stack on a Canvas context. Every complete line of your pasted text is measured with the configured font, the widest finite measurement is rounded upward to a natural pixel extent, and the Canvas is sized to that width plus the left and right padding. The height is computed as the ceiling of one and a half times the font size, multiplied by the complete logical line count, with the top and bottom padding added. After the Canvas is resized, its drawing context is obtained again so that the font, baseline, alignment, direction, kerning, background, and foreground are all reapplied explicitly. The opaque background is painted first, and every preserved line is drawn left-aligned from the same padding position with a top baseline. Blank lines still take up their full row. The finished bitmap is encoded as image/png and exposed through a local Object URL that the page revokes on edit, replacement, stale completion, or unmount.
Because the Canvas is filled only with text and solid colors, it has no cross-origin image source and does not become tainted through this workflow. Every step, including measurement, painting, PNG encoding, previewing, and downloading, happens locally.
Generate a PNG From Claude Code in Three Steps
- Paste the complete inert code text within the character, line, and per-line limits. The tool treats the input as text only, so HTML tags, script-looking strings, event-handler text, template expressions, quotes, ampersands, and angle brackets stay ordinary glyphs and are never assigned to innerHTML or inserted as DOM markup.
- Choose a light or dark theme, a font size between 12 and 32 pixels, and padding between 16 and 96 pixels, then generate the bounded natural-size PNG. The browser resizes the offscreen Canvas, paints the background, draws each line with CanvasRenderingContext2D.fillText as described in the MDN fillText reference, and encodes the bitmap asynchronously.
- Check the preview, the actual Canvas dimensions, the line count, and the PNG byte size, then download code-image.png. The downloaded file comes from the natural-size offscreen Canvas, so it is not silently downsampled to fit the page; the on-screen preview is constrained only by CSS for display.
Input Limits and Rejection Rules
The tool enforces hard limits up front so that a too-large request fails cleanly rather than producing a partial image. The exact thresholds are defined by the implementation and treated as acceptance criteria: the next unit, line, edge pixel, total pixel, or byte is rejected.
| Resource | Accepted ceiling |
|---|---|
| Total input | 50,000 UTF-16 code units |
| Logical lines | 200 |
| Per-line length | 2,000 code units |
| Canvas width or height | 8,192 pixels |
| Total Canvas area | 32,000,000 pixels |
| PNG Blob size | 20 MiB |
Disallowed control characters and unpaired Unicode surrogates are rejected with an explicit error instead of being silently replaced or dropped. LF, CRLF, and CR are recognized as line separators, empty lines and a final trailing line break remain represented as image rows, and tabs and printable Unicode are passed through to the Canvas text renderer unchanged. Accepted text is never silently shortened; there is no automatic clamp, skipped-line count, cropped region, partial image, lower-resolution retry, or silent recompression. Invalid or zero-byte PNG output is also rejected.
A Worked Sizing Example
Suppose you paste a 50-line snippet from a Claude Code session and choose a font size of 16 pixels with 32-pixel padding. The line height is the ceiling of 1.5 × font size, which gives ceil(24) = 24 pixels per line. The vertical contribution from the lines is 24 × 50 = 1,200 pixels. Adding the top and bottom padding gives 1,200 + 32 + 32 = 1,264 pixels of total height before any text measurement. The width is whatever the widest line measures in the local monospace font, rounded upward, plus the 32-pixel padding on each side. Both dimensions stay well inside the 8,192-pixel edge and 32,000,000-pixel area budgets for this input, so the PNG will encode without triggering the area or edge guard.
How the Output PNG Behaves Across Devices
The browser resolves the declared ui-monospace, SFMono-Regular, Menlo, Consolas, and generic monospace stack from locally available fonts. That means font fallback and glyph shape vary between operating systems. The same browser and font environment should produce stable measurements for the same input and options, but pixel-identical output across computers is not promised. Emoji, uncommon scripts, ligatures, antialiasing, hinting, and fallback fonts can shift the measured width or rasterized glyph edges. The result summary reports the dimensions actually assigned to the output Canvas, so you can confirm what the file contains before sharing it.
If exact pixel parity matters to you, capture the PNG on the same machine and in the same browser that will view it, and re-run the tool on the recipient's machine if cross-device parity is critical. CanvasRenderingContext2D.measureText, the underlying measurement primitive, is documented at the MDN measureText reference.
When a PNG Is the Right Format
The PNG is intended for compact visual sharing: documentation illustrations, issue reports, teaching material, and social posts. It is not a code editor, a compiler, a sandbox, a secret scanner, a syntax validator, a formatter, an OCR system, or an accessibility replacement for selectable source. The PNG stores rendered pixels rather than editable source text, syntax structure, font files, runtime output, or execution results. It does not prove that the code is correct, secure, licensed, formatted, or runnable, so review the code for credentials, tokens, private URLs, and personal information before sharing the PNG, and keep the original text separately whenever editability, exact character recovery, review history, accessibility, or archival fidelity matters.
For machine-readable formatting, the local browser also offers dedicated tools that round-trip the original text: JSON Formatter for JSON, HTML Formatter for HTML, CSS Minifier for CSS, and JavaScript Minifier for JavaScript. Those tools preserve selectable, editable source, while the Code to Image Generator deliberately discards it in favor of a flat PNG.