Free online tools
Find generators, calculators, PDF tools, text utilities, image resources, development tools, SEO utilities, construction calculators and artificial intelligence features.
Search by name or filter by category. Each tool includes instructions, processing information, practical examples and frequently asked questions.
57 tools available
Merge, split, compress, convert, edit, protect and analyze PDF documents with online tools.
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Convert pressure between PSI and MPa and view additional equivalents in kPa, bar and kgf/cm².
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Convert inches to centimeters and centimeters to inches with decimal results and approximate fractions.
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Convert square meters to square feet and square feet to square meters quickly and accurately.
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Calculate slope in percent, degrees and 1:X ratio from rise, horizontal run or any equivalent value.
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Calculate rebar quantity, total length, approximate weight, spacing and required commercial bars.
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Calculate compacted volume, required loose material, approximate weight and estimated truck loads.
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Calculate excavation volume, material swell, approximate weight and the estimated number of truck loads.
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Calculate the volume of rectangular prisms, cubes, cylinders, cones and trenches, with automatic conversion between cubic meters, liters, cubic feet and other units.
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Calculate how many liters of paint are required for walls and ceilings after subtracting doors and windows and considering coats, coverage and waste.
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Estimate the number of concrete blocks required for walls after subtracting doors and windows and adding a waste allowance.
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Calculate concrete volume for slabs, beams, columns, footings and walls, including additional allowance and approximate material quantities.
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Format, validate and minify JSON online, detect syntax errors and copy or download the result.
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Extract dominant colors from an image, get HEX, RGB and HSL values and export palettes for CSS, SCSS and Tailwind.
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Generate favicon.ico, PNG icons, Apple Touch Icon, Android Chrome icons and site.webmanifest from an image.
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Convert JPG, PNG and WebP images to PDF online, reorder multiple images and download a single document from your browser.
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Crop JPG, PNG and WebP images online, choose aspect ratios, adjust zoom, rotation and flip and download the result.
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Compress JPG, PNG and WebP images online, adjust quality and reduce file size directly in your browser.
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Convert images between JPG, PNG and WebP online, adjust quality and download the processed file directly from your browser.
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Resize images online by changing width and height, preserving aspect ratio and downloading the result without uploading files to a server.
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Clean text by removing extra spaces, line breaks and converting uppercase or lowercase.
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Count characters, words, sentences and lines from any text online.
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Generate SEO meta tags, Open Graph tags and Twitter Cards for your web pages.
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Add VAT or remove included VAT from an amount to calculate net price, tax and total.
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Calculate the final price of a product with discount and see how much you save.
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Online timer to work in focus blocks and breaks using the Pomodoro technique.
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Calculate how many days there are between two dates for events, deadlines, planning or tasks.
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Calculate your exact age in years, months and days from your date of birth.
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Calculate simple rule of three operations for proportions, prices, quantities and conversions.
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Convert text to uppercase, lowercase, capitalized text, sentence case and clean extra spaces.
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Convert titles and text into clean slugs for URLs, blogs, SEO and web projects.
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Calculate percentages, discounts, increases and variations quickly.
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Create secure passwords with letters, numbers and symbols.
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Generate free UUID v4 identifiers for development, APIs and databases.
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Count words, characters, spaces, paragraphs and estimated reading time.
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Calculate included VAT, price without VAT and total price with VAT quickly.
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Generate free QR codes for links, text, WhatsApp, websites and more.
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Combine multiple PDF files into one document and choose their order before downloading.
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Split a PDF document by pages, ranges or custom groups.
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Select and remove specific pages from a PDF document.
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Extract selected pages and save them in a new PDF file.
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Reorder PDF pages by dragging them or using page movement controls.
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Change the page sequence by dragging pages or moving them one position at a time.
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Convert photos or scanned documents into a PDF file.
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Reduce PDF file size while maintaining suitable quality.
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Attempt to recover and rebuild damaged or unreadable PDF documents.
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Convert scanned PDF documents into searchable files with selectable text.
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Convert one or more JPG, PNG or WebP images into a PDF document.
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Convert DOC, DOCX, ODT and RTF documents into PDF files securely.
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Convert PPT, PPTX and ODP presentations into PDF documents securely.
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Convert XLS, XLSX, XLSM, ODS and CSV spreadsheets into PDF documents securely.
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Convert HTML and HTM files into PDF documents while preserving styles, colors and images.
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Convert PDF pages into high-quality JPG images.
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Convert PDF documents into editable Word files.
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Convert PDF pages into a PowerPoint presentation.
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Rotate every page in a PDF or select specific pages and turn them by 90, 180 or 270 degrees.
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Generate a structured summary of the content of a PDF document.
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SG Hub brings together utilities designed to solve specific tasks without requiring additional software installation.
Access the tools from a computer, tablet or smartphone and follow the instructions provided on each page.
Many tools process data and files directly on your device using browser technology.
Tools that require server processing clearly explain how processing works and whether files are retained temporarily.
Read the Privacy Policy →In addition to the main function, each tool page includes instructions, examples, use cases, technical limitations and related tools.
This helps users understand the expected result and choose the most suitable utility for each task.
Tools to convert, organize, compress, repair, apply OCR and analyze PDF documents.
Calculators, converters and resources for architecture, civil engineering, earthworks, materials and preliminary construction planning.
Quick tools for web development, UUIDs, formats, code and technical tasks.
Resources to work with images, formats, optimization and visual content.
Utilities to count, clean, transform and improve text quickly.
Utilities to review, generate and optimize basic SEO elements for websites.
Calculators and resources for percentages, taxes, prices, costs and simple finance tasks.
Simple tools to solve quick everyday tasks directly from the browser.
How tools are published
Before a tool is added to the directory, it should provide a specific function, a clear description, usage instructions and its own page explaining the expected result.
We also review whether the route works, whether the page contains useful original information and whether users can understand the required inputs before starting.
Directory maintenance
Categories on this page are generated from active tools. A category without published content is not linked from the main directory.
This avoids empty pages and keeps navigation focused on utilities that are currently available.
Yes. The tools available in this directory can be used for free. Some features may have technical limits related to file size, document length or processing capacity.
Most tools can be used without registration. Some future or advanced features may require an account to save results or access additional limits.
SG Hub includes tools for PDF documents, images, text, finance, construction, development, SEO, artificial intelligence and other digital tasks.
Many tools process files directly inside the browser. When a feature requires server processing, its page explains this before processing begins.
Yes. The directory and individual tools are designed to work on computers, tablets and smartphones using modern browsers.
Use the search field, select a category or browse the complete list of published tools.