Varstatt Toolkit

Free developer tools to format, generate, convert, validate, and debug. No sign-up, no server calls, no tracking. Just fast, reliable tools for everyday dev tasks.

Formatters & Validators

Parse, format, validate, and test structured data and patterns.

1

JSON Formatter & Validator

Pretty-print, minify, and validate JSON with syntax highlighting and tree view.

2

YAML Validator

Validate YAML with inline errors, tree view, and common template samples.

3

JSON ↔ YAML Converter

Convert between JSON and YAML with live editing, syntax highlighting, and validation.

4

Regex Tester

Test regular expressions with live highlighting, capture groups, and quick-reference patterns.

Generators & Converters

Generate identifiers, passwords, and hashes. Encode, decode, and convert data.

5

UUID Generator

Generate UUID v1, v4, and v7. Bulk generation with multiple output formats.

6

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes for text and files.

7

Password Generator

Generate strong passwords with customizable length, character sets, and strength meter.

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1-5
8

Crontab Generator

Build and parse cron expressions visually. See next scheduled runs instantly.

9

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates with timezone support.

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10

Base64 Encoder/Decoder

Encode and decode text and files to Base64 with image preview support.

11

JWT Decoder

Decode JWT tokens into header, payload, and signature with expiration status.

12

Image to Base64

Convert images to Base64 data URIs, HTML tags, and CSS properties. Reverse mode included.

13

Encrypt / Decrypt

Encrypt and decrypt text with a passphrase using AES-256-GCM. Client-side authenticated encryption.

14

Color Converter

Convert between HEX, RGB, HSL, OKLCH. Contrast checker and palette generator.

Markdown & Documents

Edit, preview, compare, and export Markdown, CSV, and text documents.

15

CSV Editor

Visual spreadsheet editor for CSV with sort, filter, search & replace, and export.

16

Markdown Preview

Live Markdown editor with GFM support, synchronized scrolling, and HTML export.

17

Text Diff

Compare two texts side-by-side or inline with character-level diff highlighting.

18

HTML ↔ Markdown

Convert between HTML and Markdown with configurable heading, list, and link styles.

19

Markdown to PDF

Convert Markdown to beautifully formatted PDF with custom fonts, colors, and layout.

20

Markdown to DOCX

Convert Markdown to Word documents with custom fonts, sizes, and formatting.

Design & Images

Generate visual assets, codes, convert images, and work with colors.

21

QR Code Generator

Generate QR codes for URLs, WiFi, vCards, phone, email, and SMS. Custom colors and error correction.

22

Barcode Generator

Generate Code 128, EAN-13, UPC-A, and more barcodes with customization options.

23

Mesh Gradient Generator

Create beautiful mesh gradients with custom colors and positions. Export as CSS or PNG.

24

CSS Cover Art Generator

Generate abstract, geometric CSS-only cover art. Export as HTML/CSS or PNG image.

25

Image Converter

Convert images between PNG, JPEG, WebP, and more. Batch processing with quality and resize controls.

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26

Text to Gradient

Generate unique mesh gradients from any text. Same input always produces the same gradient. Export as CSS or PNG.

Built & Maintained by Varstatt

Varstatt is a one-person product studio run by Jurij Tokarski, product engineer since 2011. These tools are free and open — no signup, no catch.