All Free Online Tools
Everything runs instantly in your browser - no uploads to servers, no account required.
Everything runs instantly in your browser - no uploads to servers, no account required.
SMI Tools is a collection of over 40 free web utilities covering image conversion, developer workflows, text processing, data transformation, and number calculations. Every tool on this page runs entirely in your browser using JavaScript - nothing is uploaded to any server, there is no waiting for a server response, and your data never leaves your device. Results appear instantly as you type or as soon as you drop a file.
There is no account to create, no email to verify, no subscription to manage, and no daily usage cap. Every tool is free for every visitor, every time. Open any tool and start using it immediately - the same experience on desktop, tablet, or mobile.
The seven image tools handle the most common image processing tasks without needing Photoshop, GIMP, or any installed software. Background Remover uses a built-in AI neural network running entirely in your browser to automatically remove the background from any photo or image - no server upload required, output is a transparent PNG. PNG to JPG and JPG to PNG convert between the two most common image formats - useful for reducing file size (PNG → JPG) or preserving transparency (JPG → PNG). WebP Converter converts images to and from Google's WebP format, which is 25-35% smaller than JPG at the same quality, directly improving your website's load speed and Core Web Vitals score. Image Compressor reduces file size while preserving visual quality, ideal for web uploads and email attachments. Image Resizer changes dimensions to exact pixels - useful for social media size requirements. Image to Base64 converts an image file to a Base64 text string for embedding in CSS, HTML, or email templates.
The six developer tools are designed for the tasks developers perform repeatedly. JSON Formatter takes minified or malformed JSON and prettifies it with correct indentation, making it readable - it also validates syntax and highlights errors. Base64 Encoder/Decoder encodes text or data to Base64 and decodes Base64 strings back to readable text, with support for URL-safe Base64 variant. Password Generator creates cryptographically random passwords with configurable length and character sets. URL Encoder/Decoder handles percent-encoding for URL parameters. Hash Generator produces MD5, SHA-1, SHA-256, and SHA-512 hashes of any text input instantly. JWT Decoder decodes JSON Web Tokens and displays the header, payload claims, and expiration status without requiring the signing key.
The five text tools handle common writing and content tasks. Word Counter gives real-time counts of words, characters (with and without spaces), sentences, paragraphs, and estimated reading time - useful for SEO content, academic assignments, and social media character limits. Case Converter transforms text to uppercase, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case in one click. Lorem Ipsum Generator produces placeholder text by word count, sentence count, or paragraph count for design mockups. Duplicate Line Remover strips repeated lines from a list - useful for cleaning keyword lists, URL lists, or any data with duplicates. Markdown to HTML converts Markdown syntax to HTML code, with a live preview of the rendered output.
The four data tools handle format conversion tasks that come up constantly in API development, data analysis, and database work. JSON to CSV converts a JSON array of objects into a CSV spreadsheet - the header row is built automatically from the JSON object keys. CSV to JSON converts comma-separated data into a JSON array, with automatic type detection (numbers and booleans are not wrapped in quotes). JSON Validator checks JSON syntax and reports the exact line and character of any error, with common mistake detection (trailing commas, unquoted keys, single quotes). XML to JSON converts XML documents to JSON format, preserving attributes and nested element structure.
The five number and date tools handle conversions and calculations that come up in everyday life and technical work. Age Calculator calculates exact age in years, months, and days from a date of birth, along with the next birthday countdown. Unit Converter converts between metric and imperial units across length, weight, temperature, volume, area, speed, and more. Percentage Calculator handles all common percentage operations - finding X% of Y, percentage change between two values, and applying percentage increase or decrease. Timestamp Converter translates Unix timestamps to human-readable dates and vice versa, in both seconds and milliseconds. Color Converter converts between HEX, RGB, HSL, HSV, and CMYK color formats with a visual color picker and preview.