Dev Toolbox
Free online developer utilities that run entirely in your browser. Format JSON, encode Base64, generate hashes, test regex, and more — your data never leaves your machine.
Encoders & Decoders
Encode and decode data between formats: Base64, URL encoding, Unicode, JWT tokens, and more.
Base64 Encoder/Decoder
Encode and decode Base64 data quickly and securely in your browser.
Base32 Encoder/Decoder
Encode and decode Base32 data with support for RFC 4648 and extended hex alphabets.
Base58 Encoder/Decoder
Encode and decode data using the Base58 alphabet, the same encoding used by Bitcoin addresses.
Base85/Ascii85 Encoder
Encode and decode data using Base85 (Ascii85) for compact binary-to-text representation.
URL Encoder/Decoder
Encode and decode URL components with full percent-encoding support for web development.
JWT Token Parser
Parse, decode, and inspect JWT tokens with header, payload, and signature analysis.
HTML Entity Encoder
Encode special characters into HTML entities and decode entities back to characters.
Unicode Escape Converter
Convert text to Unicode escape sequences and back for use in source code and JSON.
Hex to ASCII Converter
Convert hexadecimal byte sequences to ASCII text and reverse for debugging and analysis.
ROT13 Cipher
Encode and decode text using the ROT13 cipher, a simple letter substitution algorithm.
Formatters & Validators
Format, validate, and beautify JSON, XML, YAML, HTML, CSS, SQL, and Markdown.
XML Formatter
Format, validate, and beautify XML documents with customizable indentation options.
YAML Formatter
Format, validate, and convert YAML documents with support for anchors, aliases, and multi-document streams.
TOML Formatter
Format and validate TOML configuration files with proper indentation and syntax highlighting.
HTML Formatter
Format, beautify, and minify HTML code with customizable indentation and tag handling options.
CSS Minifier
Minify and compress CSS files to reduce bundle size and improve page load speed.
SQL Formatter
Format and beautify SQL queries with support for multiple dialects and customizable styles.
Markdown Previewer
Preview Markdown with live rendering, export to HTML, and switch between formatting flavors.
JSON Formatter / Validator
Format, validate, minify, and transform JSON with syntax highlighting, path queries, and schema inference.
Cryptography & Hashing
Generate hashes (MD5, SHA), HMAC, bcrypt, AES encryption, RSA keys, and passwords.
Hash Generator (MD5/SHA)
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text or file — all computed locally in your browser for maximum privacy.
HMAC Generator
Generate Hash-based Message Authentication Codes (HMAC) using SHA-256, SHA-512, or MD5 combined with your secret key for tamper-proof message signing.
Bcrypt Password Generator
Hash passwords using the bcrypt algorithm with configurable cost factor (work factor). The industry standard for secure password storage.
AES Encrypt/Decrypt Tool
Encrypt and decrypt data using AES-GCM and AES-CBC with 128, 192, or 256-bit keys. Supports password-based and raw key encryption.
RSA Key Pair Generator
Generate RSA public/private key pairs with 1024, 2048, or 4096-bit keys. Essential for SSH, TLS, JWT signing, and asymmetric encryption.
Secure Password Generator
Generate cryptographically random passwords with customizable length, character sets, and complexity. All generation happens locally in the browser.
Date & Time Tools
Convert timestamps, calculate date differences, world clocks, and countdown timers.
Unix Timestamp Converter
Convert Unix timestamps (seconds, milliseconds, microseconds) to human-readable dates and vice versa. Supports any timezone.
Epoch to Date Converter
Convert any epoch/Unix timestamp to a human-readable date. Supports seconds, milliseconds, microseconds, and nanoseconds.
Date Time Calculator
Add or subtract days, hours, minutes, and seconds from any date. Calculate duration between two dates with business-day options.
World Clock & Timezone Converter
Convert times across all major world timezones. View side-by-side comparisons and find the best meeting time across zones.
ISO Week Number Calculator
Calculates ISO 8601 week numbers for any date. Find the week number, start/end dates of the week, and remaining weeks in a year.
Countdown Timer
Create countdowns to any future event including product launches, deadlines, and holidays. Shows days, hours, minutes, and seconds remaining.
Color Tools
Convert between color formats, generate palettes, check WCAG contrast compliance.
Color Converter (HEX/RGB/HSL)
Convert colors between HEX, RGB, HSL, CMYK, and HSB formats instantly with live preview and one-click copy.
Color Palette Generator
Generate harmonious color palettes from a base color using complementary, triadic, analogous, and split-complementary rules.
Color Name Lookup
Find the closest human-readable name for any color and browse the full CSS named-color reference with live swatches.
CSS Gradient Generator
Create linear, radial, and conic CSS gradients visually with multi-stop editing, angle control, and instant code output.
Color Contrast Checker
Check WCAG 2.1 color contrast ratios for text and background pairs with pass-fail indicators for AA and AAA compliance.
Text Processing
Test regex, compare text diffs, convert cases, count words, sort lines, and more.
Regex Tester
Test and debug regular expressions against your text with live matching, explanation of each pattern component, and support for all major regex flags.
Text Diff Checker
Compare two blocks of text and see exactly what changed with a side-by-side or inline diff view line-by-line or word-by-word.
Case Converter
Convert text between sentence case title case camelCase snake_case kebab-case and many other naming conventions instantly.
Word Counter
Count words characters sentences paragraphs and reading time in your text with live updating statistics and customizable targets.
Line Sorter and Deduplicator
Sort lines of text alphabetically numerically by length or by custom criteria and remove duplicate lines with one click.
ASCII Table Generator
Generate ASCII art tables from your data with customizable borders alignment and column widths for documentation and README files.
URL Slug Generator
Convert any text into a clean SEO-friendly URL slug with customizable separator character set and transliteration options.
Lorem Ipsum Generator
Generate placeholder text in Latin English or custom word lists with control over paragraphs sentences and word count.
Text Reverser
Reverse text by character by word or by line with options to preserve word order handle Unicode correctly and flip case.
Network Tools
Parse cron expressions, look up IPs, parse UUIDs, check ports, subnet calculations.
Cron Expression Parser
Parse and explain cron expressions into human-readable schedules with next-run predictions, visual timelines, and support for all Quartz and standard formats.
IP Address Lookup
Look up geolocation ISP timezone and network details for any IPv4 or IPv6 address with a clean summary and interactive map preview.
User Agent Parser
Parse any user agent string to extract browser engine operating system device type and bot detection with a clear structured breakdown.
MIME Type Lookup
Find MIME types by file extension or search by media type with descriptions common uses and the authoritative IETF RFC references for each type.
HTTP Status Code Reference
Browse search and understand every standard HTTP status code with plain explanations common causes and suggested remediation steps.
UUID Generator (v4/v7)
Generate random and time-ordered UUIDs with optional hyphens namespace prefixes and bulk output for tests database seeds and distributed systems.
Port Number Lookup
Look up registered TCP and UDP port numbers with associated services transport protocols and IANA registration notes.
Subnet Calculator
Calculate subnet mask network address broadcast address host range and CIDR notation from any IPv4 address and prefix length.
Math & Calculators
Base conversion, percentage calculation, random numbers, scientific and statistical tools.
Number Base Converter
Convert numbers between decimal, binary, octal, and hexadecimal instantly with two's complement support.
Percentage Calculator
Calculate percentage change, percentage of a total, and reverse percentages with step-by-step results.
Random Number Generator
Generate random integers, floats, UUIDs, and dice rolls with configurable ranges and no repeats.
Scientific Calculator
Full-featured scientific calculator with trigonometry, logarithms, exponents, complex numbers, and a persistent tape.
Statistics Calculator
Compute descriptive statistics including mean, median, mode, variance, standard deviation, quartiles, and correlation.
Image & Icon Tools
Convert SVG to JSX, search and copy emoji, generate image placeholder URLs.
SVG to JSX Converter
Paste SVG markup and get clean React JSX with proper prop formatting, ref forwarding, and TypeScript support.
Emoji Finder & Search
Search 3600+ emojis by keyword, category, or Unicode code point with one-click copy and skin-tone preview.
Image Placeholder Generator
Generate lightweight placeholder images in multiple formats with custom text, colors, dimensions, and blurhash output.