Explore All Tools
Browse 25 free developer, text, image, calculator, and security utilities organized with search, sorting, and category filters.
Featured Precision Engines
Resize images to exact pixel dimensions with optional aspect-ratio lock and clean local export.
Format JSON into readable, indented text or minify it into a compact form. Paste your JSON, choose an indentation style, and copy or download the result.
Count words, characters (with and without spaces), sentences, lines, paragraphs, and estimated reading time.
Solve three everyday percentage problems: X% of Y, X is what % of Y, and percentage increase/decrease from X to Y.
Generate random passwords with your preferred length and character types. Choose uppercase letters, lowercase letters, numbers, and symbols, then copy the result for use with a password manager.
Image Resizer
Resize images to exact pixel dimensions with optional aspect-ratio lock and clean local export.
JSON Formatter
Format JSON into readable, indented text or minify it into a compact form. Paste your JSON, choose an indentation style, and copy or download the result.
Word Counter
Count words, characters (with and without spaces), sentences, lines, paragraphs, and estimated reading time.
Percentage Calculator
Solve three everyday percentage problems: X% of Y, X is what % of Y, and percentage increase/decrease from X to Y.
Password Generator
Generate random passwords with your preferred length and character types. Choose uppercase letters, lowercase letters, numbers, and symbols, then copy the result for use with a password manager.
Image Compressor
Reduce image file sizes directly in your browser. Choose JPEG, PNG, or WebP output, adjust supported quality settings, and compare file sizes before downloading your image.
Image Converter
Convert images between PNG, JPEG, and WebP formats in your browser with transparency handling.
Image Cropper
Crop images interactively or by preset aspect ratios (1:1, 16:9, 4:3, freeform) and download the cropped region.
Image to Base64
Encode images into Base64 Data URLs or raw Base64 strings for inline HTML, CSS, and JSON payloads.
JSON Validator
Validate JSON syntax against RFC 8259, pinpoint parse error locations, and inspect root type and key metrics.
Base64 Encoder / Decoder
Encode and decode UTF-8 text to and from standard or URL-safe Base64 without mangling multi-byte Unicode characters.
UUID Generator
Generate cryptographically random RFC 4122 v4 UUIDs in bulk with uppercase, hyphenless, and brace formatting options.
URL Encoder / Decoder
Percent-encode and decode URL query components or full URIs with safe handling of malformed percent sequences.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case.
Remove Duplicate Lines
Deduplicate lists line-by-line while preserving original order, with toggles for case sensitivity, whitespace trimming, and empty lines.
Text Diff Checker
Compare two blocks of text line-by-line with accessible visual markers for added, removed, and unchanged lines.
Lorem Ipsum Generator
Generate bounded paragraphs, sentences, or words of classic placeholder text for wireframes and layout testing.
Age Calculator
Calculate exact chronological age in years, months, and days between a birth date and any target date.
BMI Calculator
Calculate Body Mass Index (BMI) using Metric (kg/cm) or Imperial (lb/ft/in) units with WHO adult reference ranges.
Date Difference Calculator
Calculate the exact duration between two calendar dates in years, months, days, weeks, and business days.
Unit Converter
Convert between common Length, Weight/Mass, and Temperature units with exact conversion factors and formulas.
SHA-256 Hash Generator
Compute cryptographic SHA-256 digests of UTF-8 text in your browser using SubtleCrypto (`crypto.subtle.digest`).
QR Code Generator
Create scannable QR codes for URLs, plain text, or Wi-Fi credentials in your browser with SVG and PNG download.
Color Converter
Convert colors between HEX, RGB, and HSL formats with live swatch preview, contrast ratio check, and CSS copy.
Timestamp Converter
Convert Unix epoch timestamps (seconds or milliseconds) to ISO 8601, UTC, and local date/time—and vice versa.
Calculated in Local Memory. Completely Air-Gapped.
Every utility featured in this directory executes strictly on your local CPU through isolated browser APIs, Canvas instances, and Web Crypto threads. Sensitive passwords, tokens, API dumps, and graphics never touch a remote proxy or server disk.
Browser V8 Microtask Queue Runtime