Developer Text Tools
DevPlain is a set of free, browser-based text tools for everyday developer work. Format and validate JSON, count words and characters, switch text between seven case styles, generate random passwords and PINs, percent-encode URLs, convert Base64 with full UTF-8 support, and turn CSV into JSON or NDJSON — no installs, no accounts. Every tool runs locally in your browser: your text and data never leave the page, the tools keep working offline once loaded, and each page documents exactly how its counts, encodings and conversions are computed. Pick a tool below or browse the full list of task-specific variants and guides.
Text Tools
Word Counter
Count words, characters with and without spaces, sentences, paragraphs and reading time.
JSON Formatter
Pretty-print and validate JSON; syntax errors report the line number.
Password Generator
Random passwords and PINs from 4 to 64 characters, drawn from the Web Crypto API.
Case Converter
Switch text between lowercase, Title Case, camelCase, snake_case and four more styles.
URL Encoder / Decoder
Percent-encode or decode strings with RFC 3986 rules.
Base64 Encoder / Decoder
Encode and decode Base64 with correct UTF-8 handling for any script or emoji.
CSV to JSON Converter
Convert CSV to JSON, JSON to CSV or CSV to NDJSON, quoted fields included.
Pronounceable Password Generator
Generate random passwords you can actually pronounce, from the Web Crypto API.