Developer & Text Guides
Step-by-step guides for image, PDF, developer, text, random, and productivity tools.
Practical Guide to Creating Reliable QR Codes
Turn a URL or text into a QR code, set its size and margin, and download a PNG.
How Long Should a Strong Password Be?
Generate strong passwords with browser cryptographic randomness and selectable character sets.
Common JSON Syntax Errors and Safe Formatting
JSON requires double quotes, correct commas and matching brackets. A formatter should show an error location, but secrets should never be pasted into an untrusted site.
Base64 Is Not Encryption: Encoding, Decoding and Common Uses
Base64 represents binary data as transportable text. Anyone can decode it, and size usually grows by about one third.
Unix Timestamps, Milliseconds, and Time Zones
Unix Timestamp Converter: A browser-based development and data utility with copyable or downloadable output.
Common Regular Expression Examples and Testing
Test a regular expression against sample text and inspect matches for pattern, group and rule debugging.
How Chinese Characters and English Words Are Counted
Platforms treat spaces, emoji, hyphens and CJK text differently, so the destination platform is the final authority.
Recommended tools
JSON Formatter & Validator
Format, minify and validate JSON, locate syntax errors, copy or download the result, with input processed locally in the browser.
Base64 Encoder / Decoder
Encode and decode Base64 text locally, inspect output size, copy or download results, and remember that Base64 is not encryption.
Regex Tester
Test a regular expression against sample text and inspect matches for pattern, group and rule debugging.
Unix Timestamp Converter
Auto-detect Unix seconds or milliseconds and convert among local time, UTC, ISO 8601 and multiple IANA zones with relative time.
URL Encoder / Decoder
Percent-encode or decode URLs and query values, including spaces, non-ASCII text and special characters.
Word & Character Counter
Count Chinese characters, English words, characters, sentences, paragraphs and estimated reading time locally in the browser.