Spoold is a free, privacy-first developer toolbox. Paste into the Magic Box and it detects JSON, HTML, JWT, curl, OpenAPI, CSV, timestamps, and more—then suggests the best tool. You can also browse the full catalog by category. No sign-up is required.

Is Spoold free to use?

Yes. Core tools are free. Heavy work runs in your browser so your payloads are not processed on Spoold servers for formatting, decoding, and similar utilities.

Is my data safe with Spoold?

Tool processing for supported client-side utilities happens in your browser. Encrypted share links are designed so only people with the link can read the payload. Review the Privacy Policy for details on local storage, analytics, support, and third-party services.

What tools are available?

Spoold ships 72+ tools including JSON formatter and diff, JSON Schema validation, YAML and TOML converters, HTML and Markdown preview, JWT decode and sign, OpenAPI/Swagger viewer with curl, GraphQL formatter, curl to code and curl compare, certificate viewer, CSV preview, regex tester, Mermaid, code editor, LLM token utilities, QR codes, and many encoding and text utilities.

Yes. Spoold uses optional support and in-layout promotions for its own tools instead of third-party ad placements. You can support development from the Support Spoold page.

Can I use keyboard shortcuts?

Yes. Press Cmd or Ctrl+K to open tool search, use / from the homepage, and use per-tool shortcuts (shown in the UI) such as jj for JSON and hh for HTML where configured.

Magic Box: Paste Anything, We Detect

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Auto-detects JSON, JWT, HTML, curl, OpenAPI, CSV, timestamps, and more. Catalog of 72+ tools with smart suggestions and optional learning.

Multi-format detectionSmart suggestionsClient-side learningMulti-tool workflows

Press Cmd/Ctrl + K to quickly access any tool

Keyboard shortcuts for instant tool access

Try now →

✨

Magic Box

Paste anything — JSON, HTML, curl, JWT, CSV, regex — we detect it instantly and show you the right tool. We learn your patterns and suggest workflows automatically.

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Code Editor: 40+ Languages

Edit and run code in 40+ languages. JavaScript, Python, Java, Go, Rust, and more with syntax highlighting.

40+ languagesCode execution

Try it →

About Spoold

Spoold is a free, privacy-first developer toolbox for instant results without sign-ups. Format and validate JSON, convert YAML and TOML, preview HTML and Markdown, decode and sign JWTs, convert curl to fetch or axios, browse OpenAPI and Swagger specs with curl, inspect TLS certificates, run a multi-language code editor, estimate LLM tokens, build Mermaid diagrams, hash and encode data, and use 72+ tools—all in the browser for supported workflows.

Paste into the Magic Box and Spoold detects JSON, HTML, JWT, curl, OpenAPI, Base64, CSV, regex, timestamps, and more—then suggests the best match. Heavy lifting runs client-side so your payloads stay on your device for those tools.

No account required. Save and share via encrypted links when you want to collaborate. Spoold stays ad-free through optional support and lightweight in-layout promotions for its own tools. For categories, privacy details, and FAQs, read the About page.

Learn more about Spoold

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