JSON Formatter & Validator
Pretty-print or minify JSON and see a plain-language parsing error when the document is invalid.
All tools
Every utility in the catalog, grouped by category. Each one explains what it does, what it refuses to guess, and how your input is handled.
Developer Tools
Category pageJSON to CSV Converter
Turn an array of flat objects into CSV, and stop when a nested value would have to be dropped.
JSON to YAML Converter
Convert JSON into a readable YAML document without changing the data.
YAML to JSON Converter
Parse a practical YAML subset and show the equivalent JSON.
Base64 Encoder & Decoder
Encode or decode UTF-8 text as standard or URL-safe Base64.
URL Encoder & Decoder
Percent-encode or decode text using RFC 3986 component rules.
JWT Decoder
Decode a JSON Web Token header and payload. The signature is never reported as verified.
Regex Tester
Try a JavaScript regular expression and list matches, including an error when the pattern is invalid.
Unix Timestamp Converter
Convert Unix seconds or milliseconds to a calendar time in UTC and another time zone, or the other way around.
Cron Expression Generator
Build a five-field cron expression and read it in plain language. Nothing is scheduled.
Text Tools
Category pageWord Counter
Count words, characters, sentences, paragraphs, and a rough reading time while you type.
Case Converter
Rewrite text as upper, lower, title, sentence, camel, Pascal, snake, kebab, or constant case.
Text Diff Checker
Compare two texts line by line and mark insertions and deletions.
Remove Duplicate Lines
Drop repeated lines, keep the first copy, and leave the remaining lines in their original order.
Everyday Tools
Category pagePercentage Calculator
Find a percentage of a number, what percent one number is of another, the change between two numbers, or a value increased or decreased by a percent.
Date Calculator
Add or subtract years, months, and days, and count the days between two dates, including leap years.
Discount Calculator
From an original price and a discount percent, show the amount saved and the price you pay.
Age Calculator
Find an age in years, months, and days on today or on a date you choose, including leap-day birthdays.
PDF Tools
Category pageMerge PDF
Join two or more PDF files in the order you choose and download one document.
Split PDF
Extract page ranges from one PDF and download each range as its own file.
Rotate PDF
Rotate selected pages by 90, 180, or 270 degrees clockwise and download the PDF.
Delete PDF Pages
Remove the pages you list and download a PDF that still has at least one page.
Add Page Numbers
Stamp a page number on each page, with a position, a format, and a margin you choose.
Image Tools
Category pageImage Compressor
Re-encode a JPEG, PNG, WebP, or GIF at a quality you choose, and say so only when the file gets smaller.
Image Resizer
Set a new width and height, keep the proportions when you want to, and download a PNG.
JPG to WebP
Convert a JPEG photograph to WebP in the browser and download the WebP file.
WebP to JPG
Convert a WebP image to JPEG and flatten transparency onto a background color you choose.
Favicon Generator
Build a favicon pack from an image: PNG sizes, a favicon.ico, and the HTML tags that point at them.