Dev Studio

Developer & data utilities — converters, generators and more. Pay only for what you use.

49 tools available

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Text & writing

Word & Character Counter

Count words, characters, sentences, paragraphs and reading time as you type — plus live keyword density. Everything runs in your browser, free.

Case Converter

Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case and more — instantly, in your browser.

Diff Checker / Text Compare

Compare two blocks of text and highlight every addition, deletion and change — side by side or unified. Free, in your browser.

Lorem Ipsum Generator

Generate placeholder text — paragraphs, sentences, words or list items — as plain text or HTML. Free, in your browser.

Markdown Preview & HTML Converter

Write Markdown and watch a live preview, then copy or download clean HTML — with a full editor toolbar, all in your browser.

Converters

Code to Image Converter

Turn a code snippet into a beautiful shareable image — themes, backgrounds, window chrome and more.

Universal Unit Converter

Convert length, area, volume, weight, temperature, time, speed, angle, pressure, energy, power, data and more across 16 categories — instantly and for free.

Text to Binary, Octal & Hex

Convert text to binary, octal, decimal and hexadecimal — and back again. Every field is live and editable, with delimiter, padding and uppercase options.

World Date & Time Formats

See how dates and times are written around the world — pick countries or languages and compare their formats instantly.

JSON ↔ YAML

Convert JSON to YAML and back, with validation.

JSON Formatter

Beautify, minify and validate JSON.

CSV → JSON

Turn pasted CSV into a clean JSON array.

JSON → CSV

Flatten a JSON array of objects into CSV.

Base64 Encode / Decode

Encode text to Base64 or decode it back.

Image to Base64 Converter

Encode any image to a Base64 string or a ready-to-use Data URI — perfect for inlining images in CSS, HTML or JSON.

URL Encode / Decode

Percent-encode a string or decode it (RFC 3986).

Data & spreadsheets

Spreadsheet Converter

Convert between CSV, Excel (XLSX) and JSON.

Spreadsheet Cleaner

Trim cells, drop empty rows and remove duplicates.

Excel ↔ JSON / XML

Convert spreadsheets to JSON or XML — and rebuild a spreadsheet from JSON, right in your browser.

Merge Excel Files

Combine several spreadsheets into one — stack the rows or keep one sheet per file.

Split Spreadsheet

Split a spreadsheet into multiple files — by row count or by a column’s value.

Remove Duplicate Rows

Find and remove duplicate rows — across all columns or a chosen subset.

Compare Two Spreadsheets

Find added, removed and changed rows between two spreadsheets — by whole row or a key column.

Transpose & Pivot

Flip rows and columns, or build a quick pivot table that groups and summarises your data.

Column Tools

Reorder, rename and delete columns, split one column into many, or merge columns into one.

CSV Delimiter Converter

Swap a CSV between comma, semicolon, tab and pipe — and fix the UTF-8 BOM and line endings.

Spreadsheet → HTML Table

Turn a spreadsheet into a clean, paste-ready HTML table with a live preview.

Sheet Statistics

Profile every column at a glance — type, filled vs blank, unique values, and min/max/mean/sum for numbers.

Find & Replace / Bulk Edit

Find and replace across a spreadsheet — with case, whole-cell and regex options — plus bulk trim and case transforms.

Generators

Email Signature Builder

Design a professional HTML email signature from 30 templates, customise it and save it.

Icon to PNG

Convert Bootstrap Icons, Font Awesome and more into custom PNG images — free, in your browser.

App Icon Generator

Generate a complete, store-ready app icon set for the App Store and Google Play — premium gradient, mesh and pattern backgrounds, built from your logo.

Favicon Generator

Build a complete favicon package from a logo, a font icon or a monogram — favicon.ico, modern PNGs, the Apple touch icon, PWA icons, a web manifest and the HTML snippet.

CSS Box Shadow Generator

Craft layered CSS box-shadows with live sliders for offset, blur, spread, color, opacity and inset — preview on a real element and copy ready-to-paste CSS instantly.

Fake Data Generator

Generate realistic fake data — names, emails, addresses, companies, dates, IDs and more — as a table, JSON, CSV or SQL.

QR Code Generator

Create a QR code (URL, text, Wi-Fi, vCard…) as a PNG.

Barcode Generator

Create a 1D barcode (Code128, EAN, UPC…) as a PNG.

UUID / ULID Generator

Generate UUID v4, UUID v7 or ULID identifiers.

Password Generator

Generate strong, unambiguous random passwords.

Hash Generator

Fingerprint text or files with MD5, SHA-1, SHA-256, SHA-512 and CRC32 live in your browser — verify checksums and stamp salted bcrypt hashes.

Developer utilities

Code Formatter

Beautify HTML, CSS and JavaScript — re-indent and add line breaks to make messy or minified code readable.

Code Minifier

Shrink HTML, CSS and JavaScript — strip comments and whitespace to make files smaller and load faster.

Regex Tester

Build, test and debug regular expressions live in your browser — instant match highlighting, capture groups, substitution preview, a plain-English explanation and ready-to-paste code for 15+ languages.

Cron Expression Builder

Build a cron expression from a simple, visual form — set each field, see the live expression, human-readable schedule and next run times, then parse any expression back into the form.

JWT Decoder

Decode a JWT header & payload (signature not verified).

Timestamp Converter

Convert Unix timestamps to dates and back.

ASCII / Unicode List

Inspect any character — Unicode code point, hex, decimal, octal, binary, HTML/CSS/JS escapes, UTF-8 & UTF-16 bytes and its Unicode block — look up a character from its code point, and browse a full ASCII reference table. Instant, in your browser, free.

MIME Type List

Find the MIME (media) type for any file extension — or do the reverse and discover which extensions a MIME type covers. Search a built-in database of 150+ types, filter by category and copy values instantly. In your browser, free.

International Dialing Codes

Browse every country's international calling code in a searchable directory, then open any country for its mobile & landline number formats, real example numbers and a live phone-number validator. In your browser, free.