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Developer Tools
Format and validate JSON, encode data and inspect text. Each tool explains its input format and the limits of its output.
1–24 of 96 tools
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ASCII to Text Converter
Convert ASCII or Unicode codes (decimal, hex or binary) into text.
Barcode Generator
Create Code 128, EAN-13 or UPC-A barcodes and download them as an SVG.
Base64 Encoder and Decoder
Encode UTF-8 text to Base64 or decode Base64 back to text.
Binary to Decimal Converter
Convert binary numbers to decimal, with the hex and octal equivalents.
Binary to Hex Converter
Convert binary numbers to hexadecimal.
Binary to Text Converter
Translate binary code (8-bit bytes) into readable text, with full UTF-8 support.
CMYK to RGB Converter
Convert CMYK percentages to RGB and hex values for screens.
CSS Border Radius Generator
Css Border Radius Generator for practical everyday workflows. Enter the requested values to get a clear result.
CSS Box Shadow Generator
Css Box Shadow Generator for practical everyday workflows. Enter the requested values to get a clear result.
CSS Color Extractor
Css Color Extractor for practical everyday workflows. Enter the requested values to get a clear result.
CSS Flexbox Generator
Css Flexbox Generator for practical everyday workflows. Enter the requested values to get a clear result.
CSS Formatter
Css Formatter for practical everyday workflows. Enter the requested values to get a clear result.
CSS Gradient Generator
Css Gradient Generator for practical everyday workflows. Enter the requested values to get a clear result.
CSS Grid Generator
Css Grid Generator for practical everyday workflows. Enter the requested values to get a clear result.
CSS Minifier (Basic)
Remove comments and collapse whitespace in simple CSS.
CSV to JSON Converter
Convert CSV rows into JSON objects, handling quoted fields and commas.
Decimal to Binary Converter
Convert decimal numbers to binary, with the hex and octal equivalents.
Decimal to Hex Converter
Convert decimal numbers to hexadecimal, binary and octal.
Epoch Converter
Convert between Unix epoch timestamps and human-readable dates in either direction.
Hex to Binary Converter
Convert hexadecimal numbers to binary, one nibble per hex digit.
Hex to Decimal Converter
Convert hexadecimal numbers to decimal, binary and octal.
Hex to HSL Converter
Convert a hex colour code to HSL and RGB.
Hex to RGB Converter
Convert a hex colour code to RGB values (also shown as HSL).
HSL to Hex Converter
Convert hue, saturation and lightness to a hex colour code and RGB.
About Developer Tools
This collection has 71 ready-to-use tools for developer tools. Every tool runs in your browser, so the numbers you type are not sent to a server. Each page explains what to enter, shows the formula or method behind the result, and gives worked examples you can compare against your own figures.
Results are estimates for planning and comparison. Where rates, thresholds or rules change from year to year, the tool page states the tax year or assumptions it uses. Check them against an official source before you file, pay or sign anything.
Popular here: JSON Formatter, JSON Validator, JSON to CSV Converter, CSV to JSON Converter, Base64 Encoder and Decoder, URL Encoder and Decoder, UUID Generator, Regex Tester.
Developer Tools FAQ
Is it safe to paste API responses or tokens?
The tools run in your browser and do not upload input, but treat secrets with care and avoid pasting production credentials into any web page.
Which regex flavour does the regex tester use?
JavaScript RegExp syntax. Patterns run in a disposable worker with a timeout so a runaway pattern cannot freeze the page.
Is Base64 a form of encryption?
No. Base64 is an encoding that anyone can reverse. Do not use it to protect sensitive data.