About
About Spoold
Free developer toolbox with intelligent content detection: paste JSON, YAML, TOML, HTML, JWT, curl, OpenAPI, GraphQL, CSV, or timestamps and jump to the right tool. Includes JSON Schema validation, OpenAPI viewer with curl, TLS certificate viewer, LLM token calculators, Mermaid diagrams, PDF viewer, encode/decode hub, and more—all in your browser. No sign-up required.
Whether you're formatting JSON or TOML, validating JSON Schema, previewing HTML, decoding JWTs, browsing OpenAPI specs, comparing curl commands, inspecting TLS certificates, estimating LLM tokens, or converting timestamps, Spoold gives you the right tool without a mandatory account. Paste into the Magic Box on the homepage for instant format detection and suggestions—or browse all 61+ tools by category below.
Why choose Spoold?
Privacy first
All processing runs in your browser. We don't store, transmit, or analyze your data. Your content never leaves your device.
100% client-side
Everything runs in the browser with JavaScript. No server processing means faster results and complete privacy.
No sign-up
Start using tools immediately. No accounts, no emails, no barriers. Paste and go.
Intelligent detection
The Magic Box detects what you paste—JSON, YAML, HTML, JWT, curl, OpenAPI, Base64, CSV, regex, timestamps, and more—and suggests the right tool instantly.
Save & share
Save work locally or share via secure links. History auto-saves for 90 days; saved items don't expire.
Keyboard shortcuts
Navigate fast: press / to search, or use shortcuts like jc for JSON, ht for HTML, wt for JWT.
Our tools
Spoold offers 61+ developer tools grouped by category—data (JSON, YAML, TOML, CSV, Schema), web (HTML, Markdown, URL), HTTP (curl, OpenAPI, status codes), security (JWT, certificates, passwords), encoding, text, time, and specialized helpers for LLMs and diagrams. Click any tool to open it.
How it works
Paste anything
Use the Magic Box on the homepage to paste JSON, HTML, JWT tokens, curl commands, CSV data, timestamps, Base64, or any text.
Auto-detection
Our detection analyzes your content and suggests the best tool. You can also browse all tools from the sidebar or search with /.
Use the tool
The suggested tool opens with your content pre-loaded. Format, validate, convert, or analyze as needed. Swap input/output, copy, or open in another tool.
Save & share
Save work locally for quick access or generate a shareable link. Sharing is encrypted; only people with the link can access it.
Supporting Spoold
Spoold is free to use. To keep hosting and development sustainable, the site may show advertisements or sponsored placements. In-tool banners may also rotate house promotions that highlight other utilities on the same site—they are shortcuts, not third-party trackers of your clipboard.
Your pasted payloads for supported client-side tools are still processed in the browser. For cookie choices, personalized ad opt-outs, and partner details, read our Privacy Policy.
Topics we cover
Developers find Spoold when searching for online JSON formatter, JWT decode, curl to JavaScript, OpenAPI viewer, Base64 decode, regex tester, epoch timestamp converter, PEM certificate viewer, CSV to JSON, TOML formatter, token counter for LLMs, and similar long-tail queries. The catalog is designed so API, DevOps, frontend, and data workflows share one fast entry point.
Prefer reading? The blog publishes guides that link straight into the tools (JSON Schema, curl conversion, CSV workflows, and more).
Common questions
- How many tools does Spoold include?
- The public catalog lists 61+ utilities across formatting, diffing, encoding, HTTP, security, time, text, and LLM-focused workflows. New tools ship regularly—bookmark the tools directory.
- Do I need an account?
- No. You can paste, convert, and copy results immediately. Save and share features use local storage or encrypted links without forcing sign-up.
- Where does processing run?
- For supported tools, work runs in your browser so sensitive configs and tokens are not sent to Spoold servers for those operations. Exceptions (such as URL shortening) are called out in each tool where they apply.
- Does Spoold show ads?
- The site may show ads to keep the service free. House ads promote other Spoold tools. See the Privacy Policy for cookies and opt-outs.
Privacy & security
Your privacy comes first. All processing happens in your browser. We never send your data to our servers, and we don't use analytics that track your content.
When you share via links, data is encrypted client-side before storage. Only people with the link can access it. We don't require sign-ups, so we don't collect emails or personal information. History and saved items are stored locally in your browser (IndexedDB).
For full details, see our Privacy Policy.
Open source
Spoold is open source. We welcome contributions, bug reports, and feature requests. If you find a bug or have an idea for a new tool, open an issue or submit a pull request.
Visit our GitHub repository to view the source, contribute, or report issues.
Get in touch
Have questions, suggestions, or feedback? We'd love to hear from you.
Contact usReady to get started?
Try Spoold now. No sign-up, free, and privacy-first.