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Emit a .d.ts declaration file from TypeScript source using the official compiler.
Input
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Output
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Status
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This conversion runs on our server to use a Node-only library. Your input is processed for the request and never stored.
TypeScript to Declaration is a free online converter on AltFTool that emits a .d.ts declaration file from TypeScript source using the official compiler — no signup and nothing to install.
The conversion runs on AltFTool's server: your input is sent to the AltFTool API, converted, and returned to your browser. It is not stored. TypeScript to Declaration is powered by the typescript library, and the Declaration result can be copied or downloaded as typescript-to-typescript-declaration.ts.
The input is TypeScript source: the types, interfaces and declarations in what you paste are what the converter reads.
| Input format | TypeScript |
|---|---|
| Output format | Declaration (TypeScript syntax) |
| Output file | typescript-to-typescript-declaration.ts (text/plain) |
| Runs | On AltFTool's server — the input is sent to our API and not stored. |
| Library | typescript |
| Category | TypeScript converters on AltFTool |
Open TypeScript to Declaration on AltFTool — the converter loads straight away, with no account.
Paste your TypeScript into the left-hand input pane, or press Sample to load a working example.
About 300ms after you stop typing, AltFTool posts your input to its conversion API and puts the Declaration output in the right-hand pane.
If this converter exposes options, open Settings to change them — the output re-runs as you adjust.
Copy the Declaration output with the Copy button, or download it as typescript-to-typescript-declaration.ts.
Yes — this one runs on the server, because typescript is a Node library rather than a browser one. Your TypeScript is sent to the AltFTool API, converted, and returned. It is not stored.
The typescript library, running on AltFTool's server. The Declaration you see is that library's output rather than an approximation written here.
Yes. Server-side converters accept up to 200,000 characters of input per request; anything larger is rejected with a "too large" error instead of being truncated.
The result is Declaration. Copy it from the output pane in one click, or download it as typescript-to-typescript-declaration.ts — AltFTool names the file after the converter and serves it as text/plain.
Yes. TypeScript to Declaration is free to use on AltFTool, with no account and no sign-up.
Drop the live TypeScript to Declaration workspace into your own docs page, tutorial or blog post with one snippet. Free, responsive, light and dark — just keep the “Widget by AltFTool” credit link visible.
<iframe src="https://www.altftool.com/embed/widget/transform/typescript-to-typescript-declaration"
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<p style="font-size:12px;margin:4px 0 0">Widget by <a href="https://www.altftool.com/transform/typescript-to-typescript-declaration?utm_source=embed&utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>More of AltFTool's TypeScript and format tooling, and the guides around it.