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WHALETU TOOL COLLECTION

Developer & Security

Format data, inspect tokens and create security or network values locally.

◉ Local-first50 available toolsNo account

POPULAR TASKSJSON Formatter↗Base64 Encoder / Decoder↗Regex Tester↗

COMMON INPUTS & OUTPUTSJSON · CSV · YAML · XML · TOML · text

Each tool page states exact accepted formats and limits before processing.

PRIVACY APPROACHBrowser-local whenever supported

Files and text are excluded from analytics events. Heavy modules load only when needed.

RECOMMENDED WORKFLOW

A practical path through developer work

01JSON FormatterFormat, validate and inspect JSON data.02JSON MinifierRemove unnecessary whitespace from valid JSON.03CSV ↔ JSON ConverterConvert standards-compliant CSV and JSON object arrays with a local table preview.04JSON Schema ValidatorValidate JSON data against a local JSON Schema Draft 2020-12 document.

DeveloperPopular

JSON Formatter

Format, validate and inspect JSON data.

JSON Minifier

Remove unnecessary whitespace from valid JSON.

DeveloperProfessional workspace

CSV ↔ JSON Converter

Convert standards-compliant CSV and JSON object arrays with a local table preview.

Local + downloaded code

DeveloperProfessional workspace

JSON Schema Validator

Validate JSON data against a local JSON Schema Draft 2020-12 document.

Local + downloaded code

JSON to YAML

Convert JSON data to readable YAML.

YAML to JSON

Convert YAML documents to formatted JSON.

JSON to XML

Convert JSON values to XML markup.

XML to JSON

Convert XML markup to structured JSON.

XML Formatter

Format compact XML with readable indentation.

SQL Formatter

Format SQL queries for easier reading and review.

YAML Formatter

Validate and normalize YAML documents.

JSON to TOML

Convert JSON objects to TOML configuration.

TOML to JSON

Convert TOML configuration to formatted JSON.

JSON Diff

Compare two JSON values after normalizing their structure.

DeveloperPopular

Base64 Encoder / Decoder

Encode text to Base64 or decode it back.

URL Encoder / Decoder

Encode or decode URL components safely.

URL Parser

Inspect a URL's protocol, host, path, query and hash.

HTML Entity Encoder

Encode reserved HTML characters or decode entities.

DeveloperPopular

Regex Tester

Test JavaScript regular expressions against text.

Local with limits

DeveloperProfessional workspace

JWT Inspector

Decode JWT headers, claims and timestamps locally without claiming signature verification.

Local with limits

DeveloperProfessional workspace

cURL Request Builder

Generate shell-safe cURL and fetch snippets without sending the request.

DeveloperPopular

UUID Generator

Generate cryptographically random UUID v4 values.

ULID Generator

Generate lexicographically sortable unique IDs.

Secure Token Generator

Generate random tokens with configurable length.

QR Code Generator

Create a downloadable QR code from text or a URL.

Wi-Fi QR Code

Create a QR code that joins a Wi-Fi network.

Random Port Generator

Generate a random high port number without claiming that it is available.

DeveloperPopular

Hash Generator

Create SHA-1, SHA-256, SHA-384 or SHA-512 digests.

HMAC Generator

Sign text with HMAC using a local secret key.

Bcrypt Hash & Compare

Create bcrypt password hashes and verify values locally.

Local with limits

RSA Key Pair Generator

Generate an exportable RSA public and private key pair.

Local with limits

AES Text Encryption

Encrypt and decrypt text with AES-GCM and a passphrase.

Local with limits

Password Strength Checker

Estimate password strength and identify common weaknesses.

Local with limits

Basic Auth Generator

Create an HTTP Basic Authorization header.

Slug Generator

Turn a title into a clean URL-friendly slug.

Meta Tag Generator

Build essential SEO and social metadata for a web page.

Cron Expression Explainer

Translate a cron expression into readable schedule text.

Timestamp Converter

Convert Unix timestamps and ISO dates.

User Agent Parser

Inspect browser, engine, device and operating system details.

Device Information

View browser-visible screen, locale and platform details.

Chmod Calculator

Convert Unix permissions between symbolic and octal forms.

Color Converter

Convert HEX colors to RGB and HSL.

Safe Link Decoder

Extract the original URL from Outlook Safe Links.

MIME Type Lookup

Look up common MIME types by filename extension.

HTTP Status Codes

Find the meaning of common HTTP response codes.

Phone Number Parser

Validate and inspect an international phone number.

IBAN Validator

Validate an IBAN and inspect its country and checksum.

MAC Address Generator

Generate locally administered unicast MAC addresses.

IPv4 Address Converter

Convert IPv4 addresses between dotted, integer, hex and binary forms.

Subnet / CIDR Calculator

Calculate IPv4 network, broadcast, mask and usable host ranges.

Tools that explain their limits

Every workspace is built around a clear input, visible processing state, useful result and recoverable error path. When a task can run safely in the browser, it stays on your device.

Are files uploaded?

Tools marked Local, Local with limits or Local + downloaded code do not upload tool content. Ordinary page requests may still appear in access logs.

Why do some tools load extra code?

PDF, image, schema and archive workflows load specialized modules only when their workspace opens, keeping category pages fast.

Review the privacy proof →