Check a configuration file
Validate the original format before converting. YAML validation checks syntax; it cannot tell whether an application accepts a particular setting.
Developer tools for data, text and schedules
Inspect a configuration, move a small dataset between formats or check a scheduled job before using it. These tools process the text you enter in your browser; you do not need an account or a connection to your database.
Choose by the job you need to do
Start with the task, then check the tool’s limits before relying on a result.
Move structured data between formats
JSON ↔ YAML preserves supported numeric tokens. CSV ↔ JSON keeps CSV fields as strings, including identifiers such as 00123.
Read a query or document
Choose the SQL dialect before formatting. Markdown Preview renders a restricted, sanitized preview and does not load remote images.
Encode, inspect or compare values
Base64 represents bytes; it does not encrypt them. A hash can help compare file contents. The color tool converts sRGB values and estimates text contrast against a chosen background.
Check when a job would run
Preview five-field UNIX cron with an explicit time zone. Confirm that your actual scheduler uses the same dialect and clock-change behavior.
Validate the format, then verify the meaning
Valid syntax does not prove that a query is correct, a configuration is safe or a schedule suits your server. SQL Formatter does not connect to a database or execute a query. YAML Validator does not apply an application-specific schema. The cron preview does not start a job.
For data conversion, check a small representative record first. Pay attention to string identifiers, large numbers, empty cells, line breaks and formula-like spreadsheet values. The guides below show expected outputs you can compare with your own result.
Worked examples and practical checks
Follow a complete example before applying the same workflow to your own files.
Worked example · 5 min read
Convert JSON and YAML without silently rounding numbers
Convert JSON and YAML with large integers, precise decimals and string IDs. Check the expected output and learn what downstream parsers may change.
Worked example · 5 min read
Convert CSV to JSON while keeping leading zeros and line breaks
Convert a realistic CSV example with a 00123 identifier, quoted commas, escaped quotes and a multiline field. Check the expected JSON and a safe return to CSV.
Worked example · 6 min read
Check cron schedules across time zones and daylight saving
Preview five-field cron with America/Toronto examples. See the difference between local time and UTC, skipped spring times and repeated autumn times.
Worked example · 5 min read
Decode Base64 without confusing text and binary bytes
Test Unicode, URL-safe Base64, padding and binary output with reproducible examples. Understand which bytes survive copying, editing and downloading.
Worked example · 5 min read
Format SQL for the right dialect and review the result
A PostgreSQL formatting example, dialect selection tips and a practical review checklist. See why readable SQL does not prove validity or performance.
Worked example · 5 min read
Preview Markdown and understand the cleaned HTML export
Compare Markdown source, sanitized HTML and a standalone download. Test tables, links, code and omitted images without embedded image requests.
Worked example · 5 min read
Convert CSS colors without losing alpha or misreading contrast
Convert a transparent HEX color to RGB and HSL, check text on its real background, and compare near-threshold contrast values with worked examples.
Worked example · 5 min read
Base64 is not encryption: what it does and when to use it
Encode and decode Base64 with checkable examples, learn standard versus URL-safe alphabets and padding, and avoid treating encoded secrets as protected.