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OperaA web spreadsheet is not just a grid with editable cells. It is a browser-based workspace that users expect to behave like Excel: formulas, formatting.
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Read articleFastSheet is a JavaScript spreadsheet component designed for enterprise teams that need to open, edit, and save large XLSX files directly in the browser. It suits developers integrating spreadsheet functionality into web applications and end users who want full Excel-like editing without leaving the browser.
FastSheet supports XLSX files up to the full Excel limits: 1,048,576 rows and 16,384 columns. Virtual scrolling ensures smooth performance even at these sizes, with no pagination or blank scroll gaps.
No. XLSX files can be opened, edited, and saved entirely in the browser without any server communication. An optional backend upload and download flow is also supported if your architecture requires it.
FastSheet includes 230 built-in formula functions compatible with Excel, editable formulas starting with =, formula source cell selection by mouse, external sheet references, user-defined names for cells and ranges, and custom JavaScript-based formulas.
Yes. FastSheet integrates OpenAI ChatGPT using your own OpenAI API license. The AI can manipulate and modify data, analyze and validate sheet content, apply styling, generate and format data from web search results, insert AI-generated images into cells, and handle very large sheets smoothly.
FastSheet supports multiple sheets with the ability to add, delete, move, copy, and rename them. An interactive toolbar displays the full list of sheets. A dedicated sheets and names manager menu is also available, along with automatic sheet sizing.
FastSheet works with React, Vue, Angular, Svelte, Ember, Express, Salesforce LWC, and plain Vanilla JavaScript. Full TypeScript definitions are included for strongly-typed development.
You can export to XLSX, CSV, PDF, and HTML with customizable styling and full formatting preservation. Print-ready layouts include automatic multi-page splitting and scaling.
FastSheet provides Excel-like in-cell editing with keyboard navigation, auto-fill and smart fill-down, copy and paste of values, styles and formats, multi-line and rich text editing, image insertion and manipulation, customizable context menus, and mass operations across ranges affecting formulas, values, styles, borders, and spans.
FastSheet offers significantly faster rendering and scrolling, handles XLSX files with millions of rows, eliminates blank scroll gaps, includes integrated AI, provides a sheets and names manager, supports copy and paste of cell styles and formats, allows users to save and switch between multiple configurations, and features auto-arranged and user-customizable toolbars — none of which are available in the older SpreadSheet component.
FastSheet runs in Chrome, Edge, Safari, Firefox, Opera, Android WebView, and Samsung Internet, covering all WebKit, Gecko, and Blink engine variants.