Free Developer and PC Tools

Small, fast tools for the jobs that come up while coding or fixing a PC: tidying a JSON response, decoding a login token, working out a file permission or checking why a new drive looks smaller than advertised. Each tool runs in your browser, needs no sign-up and explains the method underneath, with worked examples you can check by hand.

Developer tools

• JSON formatter: pretty-print or minify JSON with 2 spaces, 4 spaces or tabs, sort the keys and find syntax errors by line and column.
• XML formatter: indent or minify XML and find well-formedness errors, keeping comments, CDATA sections and the XML declaration.
• JWT decoder: read a JSON Web Token’s header and payload and see whether it has expired. Decodes only; it doesn’t verify the signature.
• Chmod calculator: tick read, write and execute to get the octal mode, the rwxr-xr-x form and a ready-to-copy chmod command.

Converters

• Hex to decimal: convert hexadecimal to decimal with the working shown digit by digit, plus binary and octal.
• Binary to decimal: add up the powers of 2 behind any binary number, of any length.
• Decimal to binary: see the repeated division by 2, pad to 8, 16, 32 or 64 bits and view negative numbers in two’s complement.
• Bytes to GB: convert between bytes, KB, MB, GB, TB and PB in decimal and binary units, and see the size Windows will show for a drive.
• Hex to RGB: turn a hex color code into rgb(), rgba() and hsl() with a preview, or RGB values back into hex.

Which tool do I need?

Your question	Use
Why won’t this JSON parse?	JSON formatter
How do I make this XML readable?	XML formatter
What’s inside this token, and has it expired?	JWT decoder
What does chmod 755 mean?	Chmod calculator
What is 0x1A3 in decimal?	Hex to decimal
What is 11001000 in decimal?	Binary to decimal
How do I write −5 as an 8-bit binary number?	Decimal to binary
Why does my 1 TB drive show 931 GB?	Bytes to GB
What is #FF5733 in RGB?	Hex to RGB

Looking for a step-by-step fix rather than a tool? Browse our programming guides, PC repair guides and tech tips.

Privacy

Everything runs in your browser. The text, tokens and numbers you type are never sent anywhere, and the tools work without cookies. If you accept analytics cookies, analytics only records that a tool was used, not what you entered.