Safe Tools

Welcome to Safe Tools

A safe and secure collection of tools tailored for software engineers.

All Tools

InfrastructureSecurity

Pro chmod Visual Calculator

Visually calculate Linux permissions (chmod). Supports reverse calculation from ls -l and generating commands for real-world use cases with find.

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Text

Real-time Character Counter

Real-time counter for characters, lines, and manuscript pages. Includes copy and clear features.

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GeneratorSecurity

Advanced Password Generator

Securely generate strong passwords in your browser. Supports batch creation and omitting ambiguous characters.

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Formatter

Advanced JSON Formatter

Format and compress complex JSON securely in your browser. Features instant syntax error checking and highlighting.

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Encode/DecodeSecurity

JWT Decoder

Securely decode JWTs in your browser. Includes automatic conversion of Unix timestamps.

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Text

Text Diff Checker

Securely compare changes between two texts or files in your browser. Supports file loading.

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Generator

Cron Generator & Translator

Create and translate Cron expressions with an intuitive UI. Includes simulation for next execution times.

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Encode/DecodeSecurity

Base64 Encoder / Decoder

Encode and decode text to Base64 bidirectionally. Safely supports Japanese (UTF-8) characters.

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ImageData Conversion

Image Compressor & Converter

Convert and resize between WebP, JPEG, and PNG securely on your local machine. Supports file size reduction and quality adjustments.

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Image

Image Filters & Adjustments

Securely and quickly perform brightness/contrast adjustments and various image filter processing within the browser.

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ImageGenerator

Favicon Batch Generator

Generate multiple sizes of PNGs for favicons from an image and download as a ZIP. Completely browser-side processing for safety.

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ImageSecurity

EXIF Metadata Batch Remover

Securely batch-remove EXIF metadata such as GPS location and shooting dates from images. Completely browser-side processing.

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ImageGenerator

OGP Image Resizer

Automatically convert images to the standard 1200x630px OGP size. Features blur padding, cropping, and solid fill.

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SecurityEncode/Decode

Hash Generator

Securely generate hash values (SHA-256, SHA-512, MD5, etc.) from text or files entirely in the browser.

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TextFormatter

Unix Timestamp Converter

Convert bidirectionally between Unix timestamps and dates (Local/UTC). Automatically detects seconds/milliseconds.

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Encode/DecodeImage

Image ⇔ Base64 Converter

Convert images to Base64 strings (Data URI) or Base64 back to images bidirectionally, entirely in the browser.

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Encode/DecodeText

URL Encoder / Decoder

Securely encode and decode URL parameters. Processing is completely contained within the browser.

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Generator

QR Code Generator

Generate QR codes in real-time from text or URLs, downloadable as PNG or SVG. Supports detailed settings like colors and sizing.

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Encode/DecodeText

HTML Entity Converter

Securely escape and unescape HTML special characters. Includes settings for handling quotation marks.

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TextFormatter

Text Case Converter

Batch and real-time conversion of text or variable lists into multiple formats like camelCase, snake_case, etc.

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Data ConversionFormatter

CSV ⇔ JSON Converter

Convert bidirectionally between CSV and JSON in real-time. Includes header toggle, delimiter selection, and download functionality.

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Text

Regular Expression (RegEx) Tester

Test and debug Regular Expressions (RegEx) in real-time. Securely supports highlighting and extracting capture groups locally in the browser.

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Formatter

SQL Formatter

Format long and complex SQL queries properly with appropriate indentation and casing rules, making them highly readable with syntax highlighting.

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GeneratorData Conversion

JSON to TS Type Generator

Autogenerate TypeScript definitions (Interface/Type) from JSON data. Safely supports recursive type inference in the browser.

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Data ConversionGenerator

SVG to Component Generator

Convert raw SVG code to React (JSX/TSX) or Vue component code in real-time.

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Data ConversionText

Excel / TSV to Markdown Table

Paste Excel or Google Sheets data to convert into a Markdown table in real-time. Supports text alignment settings.

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Generator

Dummy Data Generator

Securely generate test dummy data (JSON / CSV / SQL) in the browser. Design schemas freely and output bulk data with one click.

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Data ConversionFormatter

cURL to Code Converter

Convert cURL commands to Fetch / Axios / Python HTTP request code in real-time. API keys are handled securely via local processing.

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SecurityGenerator

SSH Keypair Generator

Securely generate RSA / Ed25519 SSH key pairs in the browser. Private keys are never sent to a server.

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Data Conversion

Color Converter & Palette Generator

Convert HEX, RGB, and HSL in real-time, generate WCAG contrast evaluations, and create monochromatic palettes. Completely local processing.

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InfrastructureData Conversion

CIDR Subnet Calculator (IPv4/IPv6)

Real-time calculation of network ranges and usable IPs from IP address and prefix length. Fully supports IPv6 and BigInt.

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Data ConversionFormatterInfrastructure

JSON ⇔ YAML Converter

Bidirectional real-time conversion between JSON and YAML. Supports indentation settings and alphabetical key sorting. Secure local processing.

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InfrastructureData ConversionFormatter

docker run to Compose

Convert long, complex docker run commands to IaC-friendly docker-compose.yml (V2) in real-time. Completely local processing.

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SecurityInfrastructure

SSL/TLS Decoder

Securely decode PEM format CRT, CSR, and Private Keys within the browser. Clearly displays expiration dates, SANs, and key information.

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