Developer Tools That
Respect Your Privacy
Free, fast, and secure. Every tool runs entirely in your browser — no server uploads, no data collection, no tracking. Ever.
100% Client-Side
All processing happens in your browser using JavaScript and WebAssembly. Zero network requests.
No Data Storage
We don't store, log, or transmit your data. Close the tab and it's gone. No cookies, no analytics.
Verifiably Safe
CSP headers block all external connections. Open DevTools and verify — zero outbound requests.
Why SafeTools?
In 2025, popular developer tools leaked 5GB of user data including API keys and credentials.
| Feature | SafeTools | Others |
|---|---|---|
| Data processing | Browser only | Server-side |
| Data sent to server | Never | Every request |
| Works offline | Yes | No |
| CSP verified | Yes | No |
| Tracking / Analytics | None | Multiple trackers |
Tools
All free. All private. All client-side.
JSON Formatter & Validator
Format, validate, and minify JSON with syntax highlighting. All processing happens in your browser.
Code Beautifier
Beautify and format code in JS, TS, CSS, HTML, JSON, YAML, Markdown, and GraphQL using Prettier.
Diff Checker
Compare two texts side-by-side or unified. Highlights additions, deletions, and changes at character, word, or line level.
Base64 Encoder / Decoder
Encode and decode Base64 strings and files. Supports text and binary file conversion.
URL Encoder / Decoder
Encode and decode URL components. Handles special characters, query strings, and full URLs.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files using the Web Crypto API.
JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, and signature with syntax highlighting.
Color Converter
Convert colors between HEX, RGB, HSL, and OKLCH formats with a live preview.
Regex Tester
Test regular expressions with real-time matching, capture group highlighting, and flag options.
Markdown Preview
Write and preview GitHub Flavored Markdown in real-time with syntax highlighting and export.
JSON to TypeScript
Generate TypeScript interfaces and types from JSON data automatically.
UUID Generator
Generate random UUIDs (v4) with bulk generation, formatting options, and one-click copy.
Timestamp Converter
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds.
Text Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case, UPPER CASE, and more.
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences, or words with customizable options.
SQL Formatter
Format and beautify SQL queries with dialect support for PostgreSQL, MySQL, SQLite, and more.
Markdown Table Generator
Create Markdown tables visually with a GUI editor. Add rows, columns, set alignment, and copy the generated Markdown.
Markdown to HTML
Convert Markdown to HTML with live preview. Supports full document or fragment output with optional minification.
HTML to Markdown
Convert HTML to Markdown with GFM support. Configure heading style, code block fences, and bullet characters.
Markdown to PDF
Convert Markdown to PDF with customizable page size, margins, and font size. Preview before downloading.
Password Generator
Generate strong, random passwords with customizable length, character types, and strength indicator.
QR Code Generator
Generate QR codes from text or URLs with customizable error correction, colors, and size. Download as PNG or SVG.
Image Converter
Convert images between PNG, JPEG, and WebP formats with quality control and resize options.
CSV ↔ JSON Converter
Convert between CSV and JSON formats bidirectionally. Supports custom delimiters and header options.
EXIF Viewer & Stripper
View and strip EXIF metadata from images. Remove GPS location, camera info, and other private data.
JSON ↔ YAML Converter
Convert between JSON and YAML formats bidirectionally. Perfect for Kubernetes configs, CI/CD pipelines, and DevOps workflows.
Cron Expression Generator
Build and test cron expressions with a visual editor. See human-readable descriptions and next run times.
TOML ↔ JSON Converter
Convert between TOML and JSON formats. Essential for Rust (Cargo.toml) and Python (pyproject.toml) projects.
JSON Schema Generator & Validator
Generate JSON Schema from sample data and validate JSON against a schema. Supports Draft 7 and 2020-12.
OpenAPI / Swagger Viewer
Paste an OpenAPI spec (YAML or JSON) and view interactive API documentation with endpoints, parameters, and schemas.
Text Encrypt / Decrypt (AES)
Encrypt and decrypt text using AES-GCM with the Web Crypto API. Secure client-side encryption with a password.
.env File Viewer & Editor
Parse, view, edit, and validate .env files with syntax highlighting and secret masking.
IP / Subnet Calculator
Calculate CIDR subnets, IP ranges, broadcast addresses, and network masks for IPv4 and IPv6.
LLM Token Counter
Count tokens for GPT-4, GPT-3.5, and other LLM models. Estimate API costs and check context window limits.
Prompt Template Formatter
Create prompt templates with {{variables}}, fill them in, and manage a library of reusable prompts.