FreeTools by FunnyTools.win 繁中

FreeTools for your work

Developer Tools for JSON, Encoding, UUIDs, Timestamps, and Markdown

Development and debugging often involve small data tasks: format JSON, encode a URL, decode Base64, generate a UUID, convert timestamps, move between CSV and JSON, preview Markdown, or create a QR code for testing. This page collects lightweight FreeTools utilities for those checks. Use them for examples, test data, and non-sensitive content; secrets, personal data, and confidential company data need approved security workflows.

Common needs

  • Small data conversions should not require a heavy IDE or service.
  • Debugging often needs readable JSON, timestamps, and encoded strings.
  • Test data and password generation must avoid exposing real secrets.

Recommended tools

JSON FormatterFormat, minify, and validate JSON snippets.ToolπŸ”’ Local onlyUse NowNewestBase64 Encoder / DecoderEncode and decode UTF-8 Base64 text locally.ToolπŸ”’ Local onlyUse NowNewestURL Encoder / DecoderEncode and decode URL-safe text.ToolπŸ”’ Local onlyUse NowNewestUUID GeneratorGenerate secure UUID v4 values in batches.GeneratorπŸ”’ Local onlyUse NowNewestTimestamp ConverterConvert Unix, UTC, ISO, and local date formats.ToolπŸ”’ Local onlyUse NowNewestCSV to JSON ConverterParse CSV and convert it into formatted JSON.ToolπŸ”’ Local onlyUse NowNewestJSON to CSV ConverterConvert arrays of JSON objects into standard CSV.ToolπŸ”’ Local onlyUse NowNewestMarkdown PreviewerPreview sanitized Markdown as you type.ToolπŸ”’ Local onlyUse NowNewestQR Code GeneratorTurn links or text into a QR code.GeneratorπŸ”’ Local onlyUse NowPassword GeneratorCreate strong passwords from configurable character rules.GeneratorπŸ”’ Local onlyUse NowNewest

Suggested workflow

  1. Paste only test or anonymized data, not real tokens, passwords, or personal data.
  2. Format JSON or convert timestamps, then return to code to verify field meaning.
  3. After CSV/JSON conversion, spot-check field names, empty values, and special characters.

Related categories

Text & Writing Count, clean, format, and review text for faster writing and editing. Random Generate numbers, picks, groups, and decisions for classrooms, events, and everyday choices. Work & Time Plan focus sessions, dates, breaks, and workday timing without installing an app.

FAQ

Can I paste real API keys?
No. Even when a tool is browser-oriented, real secrets should stay in approved secure tooling.
Does JSON formatting fix data meaning?
No. It helps readability and basic structure; field meaning, types, and business rules still need review.
What should I watch for with timestamps?
Check seconds vs milliseconds, time zone, daylight saving behavior, and display format.
Can generated passwords be used for real accounts?
It can help generate strong passwords, but use a password manager for storage and adjust to the target system rules.