Developer Tools

XML Formatter

Pretty-print XML, keeping CDATA and attributes

JSON Formatter & Validator

Beautify, minify and validate JSON with line and column errors

TOML ↔ JSON Converter

Convert TOML v1.0.0 to JSON and back, with line-numbered errors

JSON to YAML Converter

Convert JSON to YAML or YAML to JSON, right in your browser

XML to JSON Converter

Convert XML to JSON or JSON to XML, with error positions

curl to Code Converter

Turn a curl command into fetch, axios or Python

Hex to Decimal Converter

Convert hex numbers of any size to decimal

Decimal to Hex Converter

Convert decimal numbers of any size to hex

CSV to JSON & JSON to CSV Converter

Convert between JSON and CSV, right in your browser

Two's Complement Calculator

Signed binary, hex and decimal with overflow detection

One's Complement Calculator

Invert bits, decode and add with end-around carry

BCD Converter

Decimal to packed or unpacked BCD and back, with BCD addition

Signed Magnitude Converter

Sign-and-magnitude binary compared with one's and two's complement

Excess-N Converter

Biased and offset binary, excess-127 and excess-3 code

Bitwise Calculator

AND, OR, XOR, NOT and shifts on 8 to 64-bit values

Number Base Converter

Binary, octal, decimal, hex and any base 2 to 36, with fractions, big integers and steps

Hex Calculator

Add, subtract, multiply and divide hexadecimal, binary, octal or decimal numbers

Binary Arithmetic Calculator

Add, subtract, multiply and divide binary with steps

Binary to Decimal Converter

Binary number to decimal with place-value working

Decimal to Binary Converter

Decimal number to binary, exact for any size

Binary to Hex Converter

Group bits in fours and read hexadecimal digits

Hex to Binary Converter

Expand each hex digit into four bits

Binary to Octal Converter

Group bits in threes, with Unix permission examples

Octal to Binary Converter

Expand each octal digit into three bits

Gray Code Converter

Binary to Gray code and back, with reflected Gray table

HTML Formatter

Beautify HTML code

CSS Formatter

Format CSS code

SQL Formatter

Format or minify SQL for PostgreSQL, MySQL and SQLite

JS Formatter

Beautify JavaScript code

HTML Minifier

Minify HTML code

AWS S3 Egress Cost Calculator

Monthly S3 internet data transfer cost by tier with the 100 GB free allowance

S3 Storage Class Cost Comparison

Monthly cost of every S3 storage class for your data size, requests and retrievals

AWS Lambda Cost Calculator

Monthly Lambda cost from invocations, duration and memory, x86 or Arm

EC2 vs Lambda Break-Even Calculator

Invocations per month where Lambda costs the same as an always-on EC2 instance

CloudFront vs S3 Transfer Cost Calculator

Monthly cost of serving files from S3 directly vs through CloudFront

Cloudflare R2 vs S3 Cost Calculator

Monthly cost of Cloudflare R2 vs S3 Standard for storage, operations and egress

AWS NAT Gateway Cost Calculator

Monthly NAT gateway hourly and per-GB cost, and the saving from gateway endpoints

DynamoDB On-Demand vs Provisioned Calculator

Monthly DynamoDB cost on-demand vs provisioned, with break-even utilisation

AWS vs Azure VM Cost Comparison

On-demand Linux price of matching EC2 and Azure VM sizes by region

Unused CSS Selector Checker

Find CSS selectors that match nothing in your HTML

CSS Minifier

Minify CSS code

JS Minifier

Minify JavaScript code

SVG Optimizer

Optimize SVG with SVGO

HTML Validator

Validate HTML syntax

CSS Validator

Validate CSS syntax

JSON Validator

Validate JSON syntax and find the exact line and column

JSON Viewer

Explore JSON as a collapsible tree with copyable paths

JSON Minify

Strip whitespace from JSON and see the byte saving

CSV Validator

Check CSV structure before you import it

XML Validator and Formatter

Check well-formedness, pretty-print, minify

Web App Manifest Checker

Check manifest.json against the W3C spec

UUID Validator

Validate UUIDs and decode version, variant and timestamps

CSS Specificity Calculator

Calculate and rank CSS selector specificity

Semver Validator

Validate and compare semantic versions

Cron Expression Parser

Validate cron and see next runs

JSON Schema Validator

Validate JSON against a schema

Docker Image Name Validator

Validate image names and split them

XPath Tester and XML Path Finder

Test XPath 1.0, click a node for its path

Regex Tester

Test regular expressions

Cron Generator

Generate cron expressions

Lorem Ipsum

Generate placeholder text

JSON Diff and Compare

Compare two JSON documents by path and get an RFC 6902 patch

Code Diff

Compare code differences

UUID Generator

Generate unique identifiers

Password Generator

Generate secure passwords

ULID Generator

Generate time-sortable identifiers

Nano ID Generator

Generate short URL-safe IDs

CSS Grid Generator

Visual grid builder with HTML, CSS and Tailwind output

JSON to JSON Schema Generator

Infer a draft 2020-12 schema from sample JSON

JSON to TypeScript Generator

Infer interfaces with optional keys and unions from sample JSON

MIME Type Mapper

Map file extensions and media types

HTTP Status Codes

Look up every registered status code

Locale Format Tester

Compare Intl number and date output by locale

chmod Calculator

Convert octal and symbolic file permissions

Query-string Parser

Parse and build URL query strings

JSON Lines Validator

Validate NDJSON with line errors

JSON Escape / Unescape

Escape text into JSON strings and back

JSONPath Tester

Run RFC 9535 queries on JSON

PX to REM Converter

Convert px, rem and em

CSS Clamp Calculator

Build responsive CSS clamp values

File Hash Checker

SHA-256, SHA-1, MD5 of a file, compared with the published value

MD5 Hash Generator

MD5 checksum of text or a file as hex or Base64

SHA-1 Hash Generator

SHA-1 hash of text or a file as hex or Base64

SHA-256 Hash Generator

SHA-256 hash of text or a file as hex or Base64

SHA-384 Hash Generator

SHA-384 digest of text or a file as hex or Base64

SHA-512 Hash Generator

SHA-512 digest of text or a file as hex or Base64

HMAC Generator

HMAC-SHA256, SHA-1, SHA-384 and SHA-512 from a secret key

Hash Generator

MD5, SHA-256 hash generator

Binary Fraction Converter: Decimal to Binary

Free binary fraction converter: decimal to binary with repeating bits detected exactly, and binary back to decimal. Shows why 0.1 repeats. In your browser.

DMS to Decimal Degrees Converter & Validator

Free DMS to decimal degrees converter and lat/long validator. Converts 43°38'33.2"N style coordinates both ways, plus decimal minutes, with range checks.

Geohash Encoder & Decoder

Free geohash decoder and encoder. Decode a geohash to its bounding box and centre, encode latitude and longitude at precision 1 to 12, see the cell-size table and the…

IEEE 754 Float Converter: Float to Binary & Hex | TNAADO

Free IEEE 754 converter: decimal to float32 or float64 binary and hex, with sign, exponent, mantissa, subnormals, NaN, Infinity and a 0.1 + 0.2 explainer.

Unicode Confusable & Homograph Detector

Free Unicode confusable and homograph detector. Flag mixed-script text, see the UTS #39 skeleton of any string, and compare two strings for lookalikes using Unicode…