The Developer Privacy Problem
Developers routinely paste sensitive data into online tools: API keys into Base64 decoders, production JWT tokens into jwt.io, database queries containing customer data into SQL formatters, and proprietary code into JavaScript beautifiers. Each time, that data travels to someone else’s server.
AllTools provides 98 developer tools that run entirely in your browser. Your API keys, tokens, queries, and code are processed by JavaScript on your device. Zero bytes are ever transmitted. The tools also work offline after the initial page load — useful in air-gapped environments, restricted corporate networks, and airplane mode.
JSON Tools
AllTools includes 15 specialized JSON tools covering every aspect of JSON processing.
The JSON Formatter validates, beautifies, minifies, and converts JSON with a tree view, diff mode, and YAML export. The JSON Schema Validator checks documents against JSON Schema specifications. JSONPath Tester evaluates path expressions for extracting specific values from complex structures. JSON Diff compares two documents structurally, identifying added, removed, and changed fields.
For format conversion, JSON to CSV, JSON to YAML, JSON to XML, and the reverse converters handle data interchange between formats. Code generators convert JSON to typed structures: TypeScript, Zod, Python, Go, Rust, Java, Kotlin, Swift, C#, and PHP.
Encoding and Security Tools
Base64 Encoder/Decoder handles text and file encoding for data URIs, JWT payloads, and API authentication headers. URL Encoder manages percent-encoding for URL parameters and query strings. HTML Entity Encoder converts special characters for safe HTML embedding and XSS prevention.
Hash Generator computes MD5, SHA-1, SHA-256, and SHA-512 hashes using the Web Crypto API for file integrity verification and checksum comparison. HMAC Generator creates keyed-hash authentication codes for webhook signature verification and API request signing. JWT Decoder and JWT Generator handle JSON Web Token inspection and creation for authentication debugging.
Formatters and Minifiers
Code formatters convert minified or poorly formatted code into readable, consistently indented output. HTML Formatter, CSS Formatter, JavaScript Formatter, SQL Formatter, XML Formatter, YAML Formatter, and GraphQL Formatter each understand their language’s syntax and formatting conventions.
Corresponding minifiers compress code for production: HTML Minifier, CSS Minifier, JavaScript Minifier, and SQL Minifier strip unnecessary characters while preserving functionality.
Code Generators
UUID Generator creates v4 universally unique identifiers using cryptographic randomness. NanoID Generator produces compact URL-safe IDs. ULID Generator generates time-sortable unique identifiers.
.gitignore Generator creates ignore files for any technology stack. README Generator produces structured project documentation. package.json Generator scaffolds Node.js project manifests. Nginx Config Generator and .htaccess Generator create web server configurations.
Text and Data Processing
Regex Tester evaluates regular expressions with real-time match highlighting and capture group display. Regex Explainer translates complex patterns into plain English. Diff Checker compares any two texts with line-by-line and character-level highlighting.
Markdown Editor provides split-pane editing with live preview. Markdown to HTML and HTML to Markdown handle format conversion. Lorem Ipsum generates placeholder text.
Network and API Tools
DNS Lookup queries public DNS records via the Cloudflare API. IP Info displays your public IP address and geographic information. IP Subnet Calculator computes network ranges from CIDR notation. HTTP Status Codes provides a reference for all standard HTTP response codes. MIME Types looks up content types for file extensions. Mock API creates simulated API endpoints for frontend development.
Why Offline Capability Matters
Developer tools that work offline serve critical needs beyond convenience. Air-gapped environments — classified government systems, financial trading floors, healthcare networks — prohibit internet access on development machines. Corporate VPN environments may block access to external developer tools while internal tools are unavailable. Airplane mode and poor connectivity situations prevent server-dependent tools from functioning.
More importantly, offline capability is a privacy guarantee. If a tool works without network access, it cannot be transmitting your data — there is no server to send it to. The AllTools developer suite provides this guarantee for every tool: load the page once, and the tools function entirely from your browser’s cached JavaScript, processing your sensitive development data without any network dependency.
Comparison: AllTools vs Online Developer Tools
| Feature | AllTools | DevToys | CodeBeautify | jwt.io |
|---|---|---|---|---|
| Price | Free | Free | Free | Free |
| Tools count | 98 | ~30 | ~50 | 1 (JWT) |
| Data processing | 100% local | Local (desktop) | Server-side | Server-side |
| Account required | No | No | No | No |
| Installation | None (browser) | Desktop app | None (web) | None (web) |
| Offline support | Yes | Yes | No | No |
| Platform | Any browser | Windows/Mac | Any browser | Any browser |
| PDF/Image tools | Yes (562 total) | No | No | No |
AllTools offers the breadth of a web-based tool collection with the privacy of a desktop application — without requiring installation.
FAQ
Are these tools safe for production data?
Yes — by architecture, not just by policy. AllTools developer tools process data entirely in your browser using JavaScript. No network requests are made during processing. Your API keys, JWT tokens, database queries, and configuration files never leave your device. This makes AllTools safe for working with production credentials, customer data, and proprietary code.
How do the tools work offline?
After loading the page once, all JavaScript is cached in your browser. The tools run entirely from this cached code — no server round-trips are needed for any operation. You can disconnect from the internet and the tools continue to function. This is useful in air-gapped environments, on restricted corporate networks, and during travel.
Can I trust the JSON/JWT/Hash output?
AllTools uses standard browser APIs and well-known algorithms. JSON parsing uses native JSON.parse(). Hashing uses the Web Crypto API (the same API used by encryption libraries). JWT decoding follows the standard Base64URL + JSON specification. The outputs are identical to what server-side tools produce because they use the same underlying standards.
How does this compare to DevToys?
DevToys is an excellent desktop application with similar philosophy (local processing, privacy). The key differences: DevToys requires installation and is limited to Windows/Mac. AllTools runs in any browser, works on any platform (including Linux, ChromeOS, and mobile), and includes 562 tools beyond developer utilities (PDF, image, video, security, math).
Do you support all programming languages for code generation?
The JSON-to-code generators cover the most popular languages: TypeScript, Python, Go, Rust, Java, Kotlin, Swift, C#, PHP, and Zod schemas. For less common languages, you can generate the closest available type and adapt it manually. The formatters support HTML, CSS, JavaScript, SQL, XML, YAML, and GraphQL.
Are there plans to add more developer tools?
Yes. AllTools continuously adds new tools based on community feedback. You can suggest a tool if there’s a developer utility you need that isn’t currently available.
Complete Developer Tool Index
All 98 developer tools are free, unlimited, and private. No account required. No data uploaded. Open any tool and start working immediately with confidence that your code, data, and configurations stay on your device.
Browse all 98 tools in the Developer category. Questions? Visit the FAQ. Need something specific? Suggest a tool.
