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 cookies, optional ads, and third-party services.

What tools are available?

Spoold ships 57+ 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.

Does Spoold show ads?

The site may display advertisements or sponsored placements to help keep the service free. House promotions highlight other Spoold tools. Ads do not change the fact that supported tools process your pasted content locally in the browser. You can read how to manage ad cookies and opt-outs in the Privacy Policy.

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

gg

Auto-detects JSON, JWT, HTML, curl, OpenAPI, CSV, timestamps, and more. Catalog of 57+ 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.

ce

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 57+ 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. The site may show lightweight ads or in-layout promotions to keep the catalog free—your pasted content is not sold. For categories, ads transparency, and FAQs, read the About page.

Learn more about Spoold

Latest from the blog

OpenAPI Viewer & curl Generator — Browse Swagger / OAS 3 Specs and Copy curl Commands Online2026-04-12 · 12 min
JSON Schema Validator Online: Validate JSON Against a Schema2026-03-29 · 9 min
TOML Formatter & Validator Online: Pretty-Print and Check Cargo.toml, pyproject.toml2026-03-29 · 8 min
QR Code Samples: Copyable Links & Text to Generate QR Codes2026-01-13 · 5 min

View all posts