Your everyday dev toolkit.
Format, convert, and generate data in your browser.
Developer tools
103 toolsData & Formats
JSON Formatter
Format JSON with clean indentation.
JSON Validator
Check syntax and pinpoint errors.
JSON Minifier
Minify JSON without changing values.
JSON Diff
Compare JSON structures and locate added, removed or changed values.
JSON to YAML
Convert JSON to readable YAML without rounding numbers.
YAML to JSON
Convert YAML configuration to JSON with precise numbers.
JSON to CSV
Export JSON records to CSV with configurable columns and delimiters.
CSV to JSON
Turn CSV rows into JSON with explicit header and type options.
SQL Formatter
Format SQL queries for common database dialects.
XML Formatter
Format XML with explicit control over meaningful whitespace.
JSON to TypeScript
Generate TypeScript interfaces or type aliases from a JSON sample.
JSONPath Tester
Query JSON with JSONPath and inspect matching values and source paths.
JSON Schema Validator
Validate JSON against JSON Schema and locate data and schema issues.
YAML Formatter
Format YAML with consistent indentation while preserving comments and anchors.
JSON Repair
Repair common JSON syntax problems and review the changes before reusing the data.
XML to JSON Converter
Convert XML into JSON with explicit rules for attributes, repeated elements and mixed content.
JSON to XML Converter
Build XML from JSON using a documented compact or ordered mapping.
CSV Viewer
Explore CSV as a searchable, sortable table without uploading the file.
TOML Formatter
Format TOML 1.1 while preserving comments, string contents and original value tokens.
TOML to JSON Converter
Convert TOML 1.1 to JSON while preserving numeric precision and explicit date text.
JSON to TOML Converter
Convert JSON objects to TOML with explicit checks for null and numeric compatibility.
Encoding & Decoding
Base64 Encoder
Encode UTF-8 text or binary files.
Base64 Decoder
Decode Base64 locally with the right format.
URL Encoder
Encode URL locally with the right format.
URL Decoder
Decode URL locally with the right format.
HTML Entity Encoder
Encode HTML entities locally with the right format.
HTML Entity Decoder
Decode HTML entities locally with the right format.
Unicode Encoder
Encode Unicode locally with the right format.
Unicode Decoder
Decode Unicode locally with the right format.
Text & Regex
Text Diff
Compare text, code or configuration with line and character differences.
Text Counter
Count words, Unicode characters, lines and UTF-8 bytes, with word-frequency statistics.
Token Counter
Count text tokens locally with o200k_base or cl100k_base and inspect token IDs.
Case Converter
Convert text case and naming styles.
Text Sorter
Sort text lines with precise controls.
Remove Duplicate Lines
Remove duplicate lines with clear rules.
Regex Tester
Test regex patterns and inspect captures.
Numbers & Units
File Size Converter
Convert byte and bit sizes using clearly separated SI and IEC units.
Number Base Converter
Convert binary, octal, decimal and hex.
Decimal to Binary Converter
Convert decimal values to binary digits.
Binary to Decimal Converter
Read binary digits as decimal values.
Decimal to Hex Converter
Convert decimal values to hexadecimal.
Hex to Decimal Converter
Convert hexadecimal values to decimal.
Text to Binary Converter
Encode text as binary UTF-8 bytes.
Binary to Text Converter
Decode binary UTF-8 bytes into text.
Text to Hex Converter
Encode any UTF-8 text as a Hex string, with optional separators, uppercase letters and a 0x prefix.
Hex to Text Converter
Decode a hexadecimal byte string as UTF-8 text, with strict validation and Unicode support.
ASCII Converter
Convert ASCII text and numeric codes.
Hex Byte Reverser
Reverse byte order or individual hex digits.
Bitwise Calculator
Calculate bitwise operations at 8–256 bits.
Identifiers & Test Data
UUID Decoder
Inspect UUID versions, variants and embedded timestamps locally.
ULID Generator
Generate sortable ULIDs in bulk and decode their embedded timestamp.
Lorem Ipsum Generator
Generate Lorem ipsum placeholder text by words, sentences or paragraphs.
UUID Generator
Generate UUID v4 and v7 in bulk.
Nano ID Generator
Create random IDs with custom alphabets.
Random Number Generator
Draw random integers, with or without repeats.
Date & Time
Unix Timestamp Converter
Convert Unix timestamps and ISO dates with an explicit time zone.
Time Zone Converter
Convert a local date and time between IANA time zones.
Date Difference Calculator
Compare two dates with calendar and exact elapsed durations.
Date Calculator
Add or subtract calendar units and elapsed time from a date.
Cron Expression Parser
Validate a five-field Cron expression and preview upcoming runs.
Cron Expression Generator
Build a five-field Cron schedule and preview its execution times.
Web & API
User Agent Parser
Parse a User-Agent string into browser, OS, platform and rendering-engine details.
JWT Decoder
Inspect JWT headers, claims, and expiration.
URL Parser
Break down URLs and query parameters.
HTTP Status Code Lookup
Find HTTP status codes and their meanings.
cURL to Fetch Converter
Turn cURL requests into browser Fetch code.
Fetch to cURL Converter
Turn Fetch requests into cURL commands.
API Request Tester
Send requests and inspect API responses.
Network & DNS
Security & Cryptography
Certificate Decoder
Inspect X.509 certificates locally, including names, validity dates, extensions and fingerprints.
CSR Decoder
Decode PKCS#10 requests, inspect subject and SANs, and check the CSR signature locally.
Hash Generator
Calculate text hashes in common formats.
HMAC Generator
Generate and compare keyed message digests.
File Checksum
Hash file bytes and compare a checksum.
Password Generator
Create random passwords with Web Crypto.
bcrypt Generator
Generate bcrypt hashes and verify passwords.
AES Encrypt / Decrypt
Encrypt and decrypt with configurable AES parameters.
PBKDF2 Generator
Derive password-based keys with custom parameters.
HKDF Generator
Derive keys from input key material and context.
Development & DevOps
Frontend & Design
Markdown Preview
Preview Markdown locally and export sanitized HTML.
JavaScript Formatter
Format JavaScript, JSX, TypeScript and TSX without running the code.
HTML Formatter
Format HTML markup with readable indentation and controlled whitespace.
JavaScript Minifier
Minify JavaScript locally and compare the original and output byte sizes.
HTML to Markdown Converter
Convert HTML fragments into readable Markdown with lists, links, code blocks and tables.
Color Converter
Convert colors between HEX, RGB and HSL.
Contrast Checker
Check accessible text and UI color contrast.
CSS Gradient Generator
Create linear and radial CSS gradients.
Box Shadow Generator
Preview and copy CSS box shadows.
CSS Formatter & Minifier
Format CSS or produce compact stylesheet output.
HTML to JSX Converter
Convert HTML markup into JSX.
Images & Graphics
Favicon Generator
Create PNG favicons, a multi-size ICO and a ready-to-edit website icon package.
Image Converter
Convert PNG, JPEG and WebP images locally.
Image Compressor
Reduce JPEG or WebP image file size.
Image Resizer
Resize images with an aspect-ratio lock.
Image to Base64
Convert image bytes to Base64 or a Data URL.
SVG Optimizer
Optimize SVG markup and compare sizes.
QR Code Generator
Generate static QR codes for text or URLs.
Files & Compression
No tools found
Try JSON, format, validate, or minify.
Private by default
Local tools process on your device. API requests go to your chosen endpoint.
Precision preserved
Keep original numbers and values.
No account needed
Open a tool and get to work.