Converters & Formatters

These tools take data that is already correct and change its shape: a column of IDs into a comma list for a SQL IN clause, a minified API response into indented JSON you can read, a printed Python dict into JSON a config file will accept. None of them alter the values themselves, and each one shows a counter or a status line so you can see what went in and what came out.

Which one you need depends on where the data is going. Moving values between a spreadsheet and code, use Column to Comma Separated List or its reverse, Comma Separated List to Column; they hand off to each other with one click. If a JSON payload will not parse, the JSON Formatter reports the line and column of the fault. If the text only looks like JSON because it came from Python (single quotes, True, None), start with Python Dict to JSON instead, or go the other way with JSON to Python Dict. Page source that needs to become a README or a note is a job for HTML to Markdown, which keeps headings, lists, tables and links and escapes the characters Markdown would otherwise misread. Resizing an image or video without distorting it is a job for the Aspect Ratio Calculator: give it the original width and height and a new target dimension, and it works out the other one.