Free Developer Tools — JSON, Regex, Base64, Cron & More

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Regex Tester

Test regular expressions live with highlighted matches, capture groups, match count, and a quick-reference sidebar.

regex live groups

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JSON ↔ CSV Converter

Convert JSON arrays to CSV (or CSV back to JSON). Handles nested objects, arrays, proper escaping, and custom delimiters.

JSON CSV nested

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Base64 / JWT Decoder

Encode and decode Base64 strings, and inspect JWT tokens — header, payload, expiration status, and signature info.

Base64 JWT decode

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Cron Expression Parser

Parse any cron expression into plain English, see a field breakdown, and preview the next 10 execution times in your timezone.

cron schedule next runs

🎨

Color Converter & Palette Generator

Convert between HEX, RGB, HSL and CSS named colors. Generate complementary, analogous, triadic palettes. Check WCAG AA/AAA contrast ratios.

HEX palette WCAG

🧾

Free Invoice Generator

Create professional invoices online. Add line items, set tax rates, and download as PDF instantly. Data stays in your browser — no signup needed.

invoice PDF localStorage

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Markdown Table Generator

Build markdown tables visually. Edit cells inline, set column alignment, add or remove rows and columns, and copy the formatted markdown output.

markdown tables inline edit

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Password Generator

Generate cryptographically secure passwords using crypto.getRandomValues(). Configurable length, character sets, batch mode, strength meter, and entropy display.

security crypto batch

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QR Code Generator

Generate QR codes for any text or URL. Adjustable size, custom colors, download as PNG. 100% client-side.

QR code download PNG

📝

Word Counter & Text Analyzer

Real-time character, word, sentence, paragraph counts. Reading time, speaking time, keyword frequency, and text statistics.

text word count analytics

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Text Diff Checker

Compare two texts side by side with highlighted additions and deletions. Inline character-level diffs. Ignore whitespace or case.

diff compare side-by-side

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CSS Gradient Generator

Build linear, radial, and conic CSS gradients visually. Add color stops, adjust angles, pick from presets, and copy the CSS instantly.

CSS gradients visual

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Meta Tag Generator

Generate complete HTML meta tags for SEO, Open Graph, and Twitter Cards. Live preview of how your page looks on Google, Facebook, and Twitter.

SEO Open Graph Twitter Card

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Lorem Ipsum Generator

Generate placeholder text instantly. Paragraphs, sentences, or words. Classic Latin, hipster, tech, and pirate flavors. HTML wrapping option.

placeholder Lorem Ipsum HTML

🖼

Image Compressor

Compress images in your browser. No uploads, 100% private. Batch processing + quality control.

images batch private

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OG Image Generator

Create Open Graph social cards for blog posts and websites. 1200x630 standard format.

Open Graph social 1200×630

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SQL Formatter & Beautifier

Paste any SQL query and get clean, properly indented SQL back. Supports SELECT, INSERT, UPDATE, DELETE, CREATE and more.

SQL format beautify

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JSON → TypeScript Interfaces

Paste JSON and instantly generate TypeScript interfaces. Handles nested objects, arrays, union types, and optional/nullable fields.

TypeScript JSON interfaces

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JS / CSS / HTML Minifier

Minify JavaScript, CSS, and HTML in your browser. Removes comments, whitespace, and unnecessary characters. Shows byte savings and compression ratio.

minify compress JS · CSS · HTML