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
Percent-encode or decode strings with RFC 3986 rules.
Base64 Encoder
Encode and decode Base64 with correct UTF-8 handling for any script or emoji.
CSV to JSON
Convert CSV to JSON, JSON to CSV or CSV to NDJSON, quoted fields included.