JWT incident triage
Decode claims locally, check the expiry window, then validate the issuer and signature in the application that owns the token.
All Developer & DevOps Tools. Zero Uploads. Local Processing.
Worried about pasting production API keys, JWTs, or infrastructure configs into third-party servers? ZeroData Tools processes everything 100% client-side in your browser. Format JSON, debug tokens, calculate Linux permissions, and convert Docker files with zero data upload—your code never leaves your machine.
Lock 100% client-side processing. Your data never leaves your device.
Zero upload workflow No data stored Privacy-first tools Static Astro + Cloudflare Pages SEO-friendly, one tool per URL
118 Tools live 0 B Uploaded 100% Client-side
Privacy No uploads
Your files, tokens, configs, and payloads stay in the browser.
Processing Local only
Formatting, validation, and conversion happen on-device, not on our servers.
Structure One tool, one URL
Each utility has its own landing page for faster reuse, linking, and search visibility.
Why Local Processing Matters
Solve the task without turning the input into a new security problem
The useful part of a developer utility is the answer it gives you, not a permanent copy of the input.
Many quick fixes involve data that was never meant to leave a workstation. A production JWT can reveal tenant IDs, scopes, and timing claims. An .env file can contain database credentials and service tokens. A TLS certificate can expose internal hostnames even when the private key is kept elsewhere. Uploading those samples to a random formatter or decoder creates a second incident while you are trying to diagnose the first one.
ZeroData Tools is designed for that moment: load the page, complete the transformation in the browser, inspect the result, and close the tab. Local processing does not make an unsafe input safe, and it does not replace credential rotation or server-side validation, but it removes the unnecessary upload step from routine debugging and documentation work.
Configuration handoff
Format a configuration file, compare revisions, and remove obvious secrets before sending a reproducible example to a teammate.
API contract cleanup
Turn a sample payload into a schema, validate the next payload against it, and keep the contract close to the actual data shape.
Tool Categories
Privacy-First Developer Tool Ecosystem
Every tool runs 100% in your browser. No uploads, browser-local processing, and no server-side handling of your tool input. Explore by category.
JWT & Authentication Tools
Inspect, generate, and validate JSON Web Tokens without uploading secrets to third-party services.
Need the claim meanings? Read JWT Claims Explained for iss, sub, aud, exp, and nbf.
Privacy-First Security Tools
Scan for leaked secrets, generate secure passwords, and verify hashes — all without uploading sensitive data.
Docker & DevOps Utilities
Convert Docker commands, validate YAML configs, schedule cron jobs, and manage environment files locally.
- Convert docker run to compose
- Validate YAML configs offline
- Build cron expressions visually
- Format .env files safely
Running containers locally? Review Docker Volume Permission Denied fixes and our Docker security checklist.
Configuration & ENV Tools
Format, validate, and convert environment configuration files without exposing database credentials or API keys.
Code Formatters & Validators
Beautify, validate, and minify code locally. Format JSON, HTML, SQL, CSS, and JavaScript without exposing source code.
Popular Workflows
Common developer tool chains
Combine multiple tools in sequence for end-to-end workflows — all running locally in your browser.
JWT Security Workflow
Inspect, validate, and generate JSON Web Tokens safely.
Need to interpret token fields? Use JWT Claims Explained alongside the tools.
Docker Deployment Pipeline
Convert, validate, and configure Docker deployments end-to-end.
Avoid the common next-step issues with volume permission fixes and container hardening best practices.
Security Audit Workflow
Scan, anonymize, and strip sensitive metadata from files.
If you uncover leaked Bearer tokens, read JWT Claims Explained before rotating and reissuing them.
Explore tools
Browse All Tools
118 tools · zero upload workflow
JSON to CSV Custom
Map nested JSON arrays into clean CSV files by visually selecting the exact columns you want.
JSON Open
JSON Formatter
Format and validate JSON instantly with no uploads, no server calls, and no stored data.
JSON Open
JSON Validator
Validate JSON instantly before deploys with local processing and zero server calls.
JSON Open
YAML Validator
Validate YAML files and catch indentation errors instantly with no uploads or backend processing.
DevOps Open
Base64 Encoder
Encode or decode Base64 strings instantly with zero uploads.
Converters Open
URL Encoder
Encode and decode query parameters locally for APIs, redirects, and forms.
Converters Open
HTML Formatter
Pretty-print messy markup and inspect structure without exposing page code.
HTML Open
CSS Minifier
Shrink stylesheets for production with browser-only processing and instant output.
Text Open
JavaScript Beautifier
Reformat dense JavaScript into readable code locally for debugging.
Text Open
SVG to JSX Converter
Convert raw SVG icons into React JSX components with proper camelCase attributes.
Text Open
Cron Job Generator
Build cron expressions visually and copy production-ready schedules without trial and error.
DevOps Open
JWT Debugger
Inspect JWT headers and payloads locally without leaking tokens to third-party tools.
Security Open
Regex Tester
Test regex patterns instantly in-browser with no uploads, no logging, and immediate match feedback.
Text Open
Diff Checker
Compare text side by side without pasting private content into a cloud diff service.
Text Open
Timestamp Converter
Convert Unix timestamps to readable dates and back with zero data upload.
Converters Open
HEX to RGB
Translate color values between HEX and RGB instantly for design handoff.
Converters Open
Markdown to HTML
Preview rendered HTML output from Markdown directly in your browser.
HTML Open
SQL Formatter
Format and beautify SQL queries entirely in your browser. No database schema uploaded.
Web Open
CSV to JSON Converter
Convert sensitive CSV files to JSON securely in your browser. Handles large files with zero upload.
Data Open
Hash Generator (Bcrypt/SHA)
Generate Bcrypt, SHA-256, and MD5 hashes locally. Never send passwords over the network.
Security Open
UUID / GUID Generator
Generate secure UUIDs (v4) instantly in your browser. Perfect for database seeding.
Security Open
JSON to TypeScript
Generate TypeScript interfaces from JSON API responses locally and securely.
Web Open
Password Generator
Generate cryptographically secure passwords in your browser. No passwords are transmitted or stored anywhere.
Security Open
Password Strength Checker
Check how strong your password is locally — entropy analysis, time-to-crack estimate, and zero data upload.
Security Open
Lorem Ipsum Generator
Generate placeholder text instantly for mockups and wireframes. Runs locally with no server calls.
Generators Open
Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case, and more — instantly in your browser.
Text Open
Word & Character Counter
Count words, characters, sentences, and paragraphs in real time with reading time estimates. No data uploaded.
Text Open
Email Extractor
Extract and deduplicate email addresses from any text block locally. No data leaves your browser.
Text Open
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal bases instantly in your browser.
Converters Open
JWT Generator
Create test JWT tokens with custom headers and payloads locally. Sign with HMAC-SHA256 using Web Crypto API.
Security Open
QR Code Generator
Generate QR codes from any text or URL entirely in your browser. Download as SVG or PNG with zero tracking.
Generators Open
QR Code Decoder
Decode QR codes from uploaded images locally in your browser. No image data is sent to any server.
Converters Open
Secret Scanner
Scan code and config files for leaked API keys, tokens, and secrets — entirely in your browser with zero uploads.
Security Open
HTTP Header Analyzer
Parse and analyze HTTP response headers for security issues. Check CSP, HSTS, and more — locally in your browser.
Security Open
EXIF Metadata Remover
Strip GPS and camera data from images locally in your browser. No uploads, 100% private.
Security Open
JSONL to JSON Converter
Convert JSON Lines (JSONL) files to standard JSON arrays instantly. Runs 100% locally in your browser.
Converters Open
Docker Run to Compose Converter
Convert docker run commands into docker-compose.yml files instantly. Runs completely locally in your browser.
DevOps Open
ENV File Formatter
Format, sort, and align your .env files instantly. Runs 100% locally in your browser to keep your secrets safe.
DevOps Open
Log File Anonymizer
Strip IPs, emails, API keys, and other PII from server logs. Regex-based scrubbing runs entirely in your browser.
Security Open
JWT Expiry Checker
Paste a JWT and instantly see when it expires in your local timezone. No server, no uploads.
Security Open
Chmod Calculator
Visual Linux file permissions calculator with numeric mode, symbolic notation, and common presets.
DevOps Open
CORS Header Generator
Generate CORS headers for Nginx, Apache, and Express.js with a visual builder. No data uploaded.
DevOps Open
Bcrypt Hash Verifier
Verify bcrypt password hashes and generate new ones entirely in your browser. Your passwords never leave your machine.
Security Open
Chown Command Generator
Generate Linux chown commands visually to change file and directory ownership. Set user, group, and flags — 100% browser-based.
DevOps Open
ENV to JSON Converter
Convert .env files to JSON and JSON to .env format instantly. Bidirectional conversion runs 100% in your browser.
Converters Open
CORS Tester
Test CORS headers on any API endpoint directly from your browser. Simulate cross-origin requests and get fix recommendations.
DevOps Open
JWT Signature Verifier
Verify JWT signatures locally using Web Crypto API. Supports HS256, RS256, and ES256. Your secrets never leave your browser.
Security Open
Docker Compose Validator
Validate and lint docker-compose.yml files in your browser. Detect unquoted ports, missing images, broken services, and YAML syntax issues locally.
DevOps Open
JSON Schema Validator
Validate JSON data against a JSON Schema locally in your browser. Powered by Ajv with format support. 100% private.
JSON Open
Systemd Service Generator
Generate Linux systemd service unit files visually. Configure ExecStart, restart policies, and dependencies — 100% browser-based.
DevOps Open
Docker Compose env_file Mapper
Convert .env files to Docker Compose YAML environment blocks. Array, dictionary, and variable substitution formats — 100% in your browser.
DevOps Open
Nginx Config Generator
Generate Nginx server block configurations visually. Reverse proxy, SSL, gzip, and security headers — 100% browser-based.
DevOps Open
Nginx Reverse Proxy Generator
Generate Nginx reverse proxy configurations visually. proxy_pass, headers, WebSocket support, and upstream blocks — 100% browser-based.
DevOps Open
SSH Config Generator
Build SSH config file entries visually. Host aliases, identity files, jump hosts, and port forwarding — 100% browser-based.
Security Open
HMAC Generator & Verifier
Generate and verify HMAC signatures with SHA-256, SHA-384, SHA-512 using Web Crypto API. Hex and Base64 output — 100% in your browser.
Security Open
Connection String Parser
Parse and build PostgreSQL, MySQL, MongoDB, Redis, and JDBC connection strings locally. Extract components and generate code snippets — 100% browser-based.
DevOps Open
Docker Compose Diff Tool
Compare two docker-compose.yml files side by side. Detect service changes, image upgrades, port and environment differences — 100% browser-based.
DevOps Open
Kubernetes ConfigMap Generator
Generate Kubernetes ConfigMap YAML manifests visually. Import from .env or JSON, add key-value pairs — 100% browser-based.
DevOps Open
Kubernetes Secret Generator
Build Kubernetes Secret YAML with automatic Base64 encoding. Supports Opaque, Docker registry, TLS, and basic-auth types — 100% in your browser.
Security Open
Ansible Inventory Generator
Build Ansible inventory files visually in INI or YAML format. Add groups, hosts, and variables — 100% browser-based, no uploads.
DevOps Open
JSON to JSON Schema
Generate JSON Schema Draft-07 definitions from any JSON object automatically. Types, nested objects, arrays, and format detection — 100% browser-based.
JSON Open
Crontab Translator
Translate cron expressions to plain English instantly. See the next 5 scheduled run times in your local timezone. Supports wildcards, ranges, steps, and @shortcuts — 100% browser-based.
DevOps Open
SSH Key Generator
Generate RSA 2048-bit or 4096-bit SSH key pairs in your browser. Private key in PKCS#8 PEM format, public key in OpenSSH authorized_keys format — 100% browser-based, zero uploads.
SSH Open
JWK & JWKS Generator
Generate JSON Web Keys (JWK) and JWKS for JWT signing. Supports RS256, RS384, RS512, ES256, ES384, ES512, HS256 — 100% browser-based via Web Crypto API.
Security Open
SSH Command Builder
Build SSH connection commands visually with port forwarding tunnels, identity keys, jump hosts, and advanced options — 100% browser-based.
SSH Open
Nginx Rewrite Rule Generator
Generate Nginx rewrite and redirect rules visually. Configure path matching, regex patterns, flags, and condition checks locally.
DevOps Open
Systemd Timer Generator
Generate Linux systemd .timer and .service unit files visually. Modern crontab scheduler replacement — 100% browser-based.
DevOps Open
JSON Schema to TypeScript
Convert JSON Schema Draft definitions into TypeScript interfaces instantly. Local browser-only parsing, zero data uploads.
JSON Open
JWK to PEM Converter
Convert JSON Web Keys (JWK) to PEM format and back. Supports RSA and EC keys using Web Crypto API — 100% browser-based, zero uploads.
Security Open
SSH Tunnel Generator
Generate SSH tunnel commands for local, remote, and dynamic SOCKS forwarding. Includes systemd service and SSH config output — 100% browser-based.
SSH Open
Docker Volume Permissions Helper
Fix Docker volume permission issues visually. Generate chown, chmod, and Dockerfile commands for bind mounts and named volumes — 100% browser-based.
DevOps Open
Nginx Rate Limiting Configurator
Generate Nginx rate limiting directives visually. Configure limit_req_zone, burst, nodelay, and custom 429 error pages — 100% browser-based.
DevOps Open
JSON Schema Diff Tool
Compare two JSON Schemas side by side. Detect added, removed, and changed properties, types, and constraints for API versioning — 100% browser-based.
JSON Open
Postman to OpenAPI Converter
Convert Postman Collection v2.1 JSON into OpenAPI v3 YAML or JSON entirely in your browser. No data uploaded.
Converters Open
Base64 Image Converter
Convert images to Base64 data URIs instantly. Drag and drop PNG, JPG, WebP, or SVG files for 100% local, browser-based encoding with zero uploads.
Converters Open
Htpasswd Generator
Generate Apache and Nginx .htpasswd basic authentication credentials securely. Supports Bcrypt, MD5, and SHA-1 hashing — 100% browser-based.
Security Open
cURL to Code Converter
Convert cURL commands to modern code instantly. Translates to Fetch, Axios, and Python Requests — 100% browser-based, zero data uploads.
Converters Open
CSR Decoder
Decode Certificate Signing Requests (CSR) locally. Inspect Common Name, SANs, and Organization details using Web Crypto APIs with zero uploads.
Security Open
SemVer Calculator
Calculate and visualize Semantic Versioning (SemVer) ranges. Test npm package version constraints locally in your browser.
DevOps Open
Security Headers Builder
Generate HTTP security response headers for Nginx, Apache, Express, Caddy, and Cloudflare Workers.
Security Open
API Key Generator
Generate cryptographically secure API keys locally. Supports custom prefixes, Base62 encoding, and high entropy.
Security Open
YAML ↔ JSON Converter
Convert YAML to JSON and JSON to YAML instantly in your browser. Resolves anchors and aliases with zero uploads.
Converters Open
Certificate Decoder
Decode X.509 SSL/TLS certificates locally. Inspect issuer, subject, validity dates, SANs, and key details with zero uploads.
Security Open
Git Branch Generator
Generate standard, sanitized Git branch names from feature descriptions or Jira tickets. Copies git checkout command instantly.
DevOps Open
DKIM, SPF & DMARC DNS Builder
Generate exact SPF, DKIM, and DMARC DNS records for Google Workspace, Microsoft 365, Mailgun, and SendGrid instantly.
Security Open
Web Log Analyzer
Quickly analyze Nginx and Apache access logs right in your browser. Extract top IPs, requested paths, and status code distributions for fast debugging.
DevOps Open
Hosts File Generator
Generate and manage hosts file entries visually. Map IP addresses to domain names easily in your browser.
DevOps Open
Kubernetes Ingress Generator
Generate Kubernetes Ingress YAML manifests visually. Configure rules, TLS secrets, and service backends directly in your browser.
DevOps Open
SRI Hash Generator
Generate Subresource Integrity (SRI) hashes (SHA-256, SHA-384, SHA-512) for script and style tags locally.
Security Open
SQL to JSON Schema Generator
Convert SQL CREATE TABLE statements into JSON Schema definitions automatically in your browser.
JSON Open
Dockerfile Optimizer
Lint and optimize Dockerfiles for security, layer caching, and multi-stage builds in your browser.
DevOps Open
AI Prompt Token Counter
Client-side tokenizer for OpenAI (tiktoken) and other models. Count tokens and estimate costs accurately.
AI Open
Mock Data Generator
Generate realistic fake data (names, emails, addresses, UUIDs) locally in your browser. Export to JSON, CSV, or SQL INSERT.
Generators Open
AWS IAM Policy Builder
Visual form builder for AWS IAM JSON policies. Generate least-privilege IAM permissions instantly in your browser.
DevOps Open
OpenGraph Generator
Visually generate OpenGraph and Twitter meta tags with a live social media card preview.
Generators Open
WCAG Color Contrast Checker
Check foreground and background color contrast ratios against WCAG AA and AAA accessibility standards.
Converters Open
Tailwind to Vanilla CSS
Convert Tailwind utility classes into equivalent vanilla CSS declarations entirely in your browser.
Converters Open
Client-Side Image Optimizer (WebP)
Compress and convert images (PNG/JPG) to WebP securely in your browser using native Canvas APIs.
Converters Open
PDF Metadata Stripper
Remove author, creation date, and software metadata from PDF files securely in your browser. Zero uploads.
Security Open
Subnet Calculator
Calculate IPv4 subnets, CIDR ranges, network addresses, and usable host counts entirely in your browser.
DevOps Open
XML Formatter
Format, beautify, and validate XML with syntax highlighting. Minify for production or indent for readability — 100% private.
Converters Open
XML to JSON Converter
Convert XML to JSON and JSON to XML bidirectionally. Handles attributes, CDATA, and namespaces — 100% client-side.
Converters Open
Markdown Table Generator
Build GitHub Flavored Markdown tables visually. Import from CSV or JSON, set column alignment, and export instantly.
Text Open
.gitignore Generator
Generate .gitignore files for any stack. Combine Node.js, Python, Go, and IDE templates instantly.
DevOps Open
CSS Box Shadow Generator
Generate CSS box shadows visually. Stack layers, adjust blur, spread, color, opacity, and copy the CSS instantly.
web Open
HTML Entities Converter
Encode and decode HTML entities in named, decimal, or hex format. Prevent XSS and safely embed special characters in HTML.
HTML Open
CSS Clamp Generator
Generate CSS clamp() values for fluid typography and spacing. Build a full type scale with live viewport preview.
web Open
BIP39 Seed Generator
Generate BIP39 mnemonic seed phrases with cryptographically secure browser randomness. 12-24 words, checksum validated.
Security Open
Webhook Signature Verifier
Verify Stripe, GitHub, and Shopify webhook HMAC signatures locally. Debug failed webhooks without exposing your secrets.
Security Open
HAR File Analyzer
Analyze and redact HAR files locally. Strip auth tokens, cookies, and API keys from network traces before sharing. 100% client-side.
Security Open
Kubeconfig Merger
Merge multiple kubeconfig files and strip sensitive tokens and certificates locally. Zero data uploaded to any server.
DevOps Open
NanoID / ULID Generator
Generate NanoID, ULID, and CUID2 identifiers with custom alphabet and batch support. Cryptographically secure and browser-based.
Generators Open
TOML to JSON Converter
Convert TOML to JSON or YAML and back. Handle Cargo.toml, pyproject.toml, and wrangler.toml files in your browser.
Converters Open
Base58 Encoder
Encode and decode Base58 with Bitcoin, IPFS, and Flickr alphabets. Supports Base58Check with checksum validation.
Converters Open
SQL to TypeScript
Generate TypeScript interfaces from SQL CREATE TABLE statements. Maps PostgreSQL and MySQL types with nullable and camelCase support.
Converters Open
JSON to Pydantic
Generate Pydantic BaseModel classes from JSON. Supports v1 and v2, optional fields, and camelCase aliases.
JSON Open
JSON to Go Struct
Convert JSON to Go structs with proper type inference, struct tags, omitempty, and pointer types for nullable fields.
JSON Open
JSON to Zod Schema
Generate Zod validation schemas from JSON payloads. Supports z.object, z.array, z.infer, and Zod v3.
JSON Open
ASCII Tree Generator
Generate ASCII directory tree diagrams from file paths for README files and documentation. Multiple styles supported.
Text Open
FAQ
Quick answers before you paste anything
Developer tools only earn trust when the privacy model is obvious. Here are the short answers most people want first.
- Is my data stored?
No. Inputs are processed in your browser and are not uploaded to our servers. Try it yourself with the JSON Formatter — check your Network tab and confirm that your pasted tool input is not being sent to our backend for processing.
- Does it work offline?
After the page loads, the actual formatting and conversion logic runs locally, so many workflows continue without server round-trips. Tools like the Base64 Encoder work fully offline.
- Is it free?
Yes. All tools — from the JSON Formatter to the URL Encoder — are free to use with no limits, no premium tier, and no sign-up.
- Do I need an account?
No login is required. Open any tool, paste your content, and work immediately. Start with JSON Formatter →