Online tools for developers and marketers

JSON Formatter

Format, validate and minify JSON online

Base64 Encoder

Encode and decode Base64 online

URL Encoder

URL encoding and decoding online. Convert special characters, Cyrillic, and spaces to URL-safe format

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes online. Compute checksums for text strings

UUID Generator

Generate unique UUID v4 identifiers online. Bulk UUID creation for databases and APIs

Regex Tester

Test regular expressions online with match highlighting. Validate regex patterns against test strings

Unix Timestamp

Convert Unix timestamp to date and back

Color Picker

Pick a color and convert between HEX, RGB, HSL formats. Color palette with CSS value copying

Text Diff

Compare two texts online with difference highlighting. Finds added, removed, and changed lines

Lorem Ipsum

Lorem Ipsum placeholder text generator for mockups and prototypes. Customize paragraphs, words, and sentences

Password Generator

Generate strong random passwords online. Customize length, characters, digits, and special symbols

CSS Minifier

Minify CSS code online — remove whitespace, comments, and formatting to reduce file size

JS Minifier

Minify JavaScript code online — compress JS files, remove whitespace and comments

HTML Entities

Encode and decode HTML entities

Base64 Decoder

Decode Base64 string to text online. Quickly decode encoded data, images, and files

JWT Decoder

Decode and analyze JWT tokens online

SQL Formatter

Format and highlight SQL queries online. Auto-align SELECT, JOIN, WHERE, and subqueries

Cron Generator

Cron expression generator with visual interface

CSS Gradient

CSS gradient generator with visual editor

CSS Shadow

CSS box-shadow generator with visual editor

CSS Border Radius

CSS border-radius generator with visual editor

Markdown Preview

Markdown preview with HTML conversion

WCAG Contrast

Check color contrast by WCAG standard

Password Strength

Check password strength and reliability. Estimate crack time, entropy, and improvement recommendations

HTTP Headers

View HTTP response headers of any URL

DNS Lookup

View domain DNS records: A, AAAA, MX, NS, TXT

SEO Text Analyzer

Text analysis: nausea, water content, word frequency

Meta Tag Generator

Generate HTML meta tags: title, description, Open Graph

Keyword Generator

Generate search queries and LSI words from a keyword

Open Graph Checker

Check Open Graph and meta tags of any URL

robots.txt Generator

Create robots.txt file for site indexing control

Schema.org Generator

Generate Schema.org JSON-LD markup for SEO

INN Generator

Generate test INN numbers for development and testing

INN Validator

Validate INN by checksum

SNILS Generator

Generate test SNILS numbers with correct checksum for software development and testing

OGRN Validator

Validate OGRN by check digit

VAT Calculator

VAT calculation: add or extract value added tax

Income Tax Calculator

Income tax calculation with 2025 progressive scale

USN Calculator

Simplified taxation system calculator

XML Validator

Validate XML online with syntax highlighting. Format and detect errors in XML documents

Color Replacement

Replace color in a photo online for free

Image to Base64

Convert image to Base64 string online. Generate data URI for embedding images in HTML and CSS

Image Resize

Resize images online while maintaining aspect ratio. Export to PNG, JPEG, and WebP

Image Compression

Compress images online without quality loss

Format Converter

Convert images between PNG, JPEG, WebP formats

Watermark

Add text watermark to an image

UTM Generator

UTM tag generator for links — create tagged URLs to track ad campaigns in analytics

ROI Calculator

Calculate return on investment (ROI) and marketing campaign profitability. Compare channel effectiveness

CPM Calculator

CPM, CPC, CPA advertising metrics converter. Calculate cost of impressions, clicks, and conversions

A/B Test

A/B test statistical significance calculator

LTV Calculator

Calculate customer lifetime value (LTV)

Unit Economics

Unit economics calculator — compute CAC, LTV, ARPU, and margins for business model evaluation

QR Generator

Generate QR codes online — create QR codes for links, text, and contact data with size settings

Word Counter

Count characters, words and sentences in text

Transliteration

Cyrillic to Latin transliteration and back

Text Case Converter

Text case conversion: upper, lower, title case