Data and developer guides
Data and developer guides: JSON, CSV, encoding and formatting
Developers and analysts paste sensitive things into online tools every day: API responses, customer exports, tokens. These guides show how to format, convert and check data with tools that run locally, so the data never touches anyone else's server.
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Data and developer
That long token is readable by anyone, so where you paste it matters. Decode a JWT and read it safely
Split a token into its three parts, read the claims and the exp date, and learn the difference between decoding a token and verifying it.
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Data and developer
Base64 looks like encryption and is not. What it does, why it exists and why your decode fails
Encode text, files and images, decode a string, and learn the 33 percent size cost, the URL-safe variant and the usual reasons a decode goes wrong.
Data and developer
Your regex works on three examples and fails on the fourth. Here is how to find out why
Read a pattern piece by piece, set the right flags, preview a replacement and check the usual mistakes behind a pattern that does not match.
Data and developer
The download page prints a long string of letters next to the button. Here is how to check it in a minute
Hash the file, paste the published value and read Match or No match. Then what a match proves, what it cannot, and the same check on the command line.
Data and developer
Length beats cleverness: how long a password should be, and the arithmetic that proves it
Entropy in plain words, a table of length against character set, passphrases against passwords, and what to do when a site you use is breached.
Data and developer
Your JSON is one unreadable line, or the parser says "unexpected token at position 412". Find out what is wrong
Paste it, get it indented, and read the line and column of what the parser choked on. Then the seven mistakes behind most invalid JSON.
Data and developer
Excel mangled your CSV? Convert CSV to Excel, JSON and back without losing zeros, dates or accents
CSV to Excel, Excel to CSV, CSV to JSON and JSON to CSV, plus why zeros vanish, why accents break and what nested JSON becomes in a table.
Free data & developer tools
Data Converter
Convert CSV, TSV, JSON, XML, YAML and Excel files into each other, with nested data and large files handled.
Opens CSV, TSV, JSON, XML, YAML, XLSX · Saves CSV, TSV, JSON, XML, YAML, XLSX
Open toolBase64 Encoder and Decoder
Encode and decode Base64 for text, files and images, with URL-safe and line wrapped options.
Opens Text, any file, Base64 strings · Saves Base64 text, decoded files
Open toolColor Converter
Convert a color between HEX, RGB, HSL, HSV and CMYK and check its contrast with white and black.
Opens HEX, RGB, HSL, HSV, CMYK, CSS names · Saves Copied CSS
Open toolCSS Formatter
Beautify or minify CSS, with unclosed comments, strings and brackets reported.
Opens CSS, SCSS, Less · Saves CSS
Open tool