The World's #1 Selling JavaScript Spreadsheet With Over 500 Excel Functions
Deliver true Excel-like spreadsheet experiences, fast - with zero dependencies on Excel. Create financial, budgeting/forecasting, scientific, engineering, healthcare, insurance, and many other similar JavaScript spreadsheet business applications.
- Create custom JavaScript spreadsheets, advanced grids, dashboards, reports, and data input forms and much more with the comprehensive API
- Leverage the powerful, high-speed calculation engine for your most complex calculations
- Import and export your most demanding Excel .xlsx spreadsheet
Customer Spotlight: Ramp Labs
See why they chose SpreadJS to power Ramp Sheets, an AI-native spreadsheet application. See Full Case Study →
Test Drive the Ultimate JavaScript Spreadsheet
JavaScript spreadsheet components are software elements that enable developers to add Excel-like features to web applications. SpreadJS offers a suite of controls for .xlsx import/export, data input, 30+ chart types, cell customization, a robust calculation engine with 500+ functions, and more.
Ultimate JavaScript Spreadsheet Solution
Familiar Spreadsheet Experience with Excel IO
SpreadJS delivers a robust JavaScript spreadsheet experience, featuring support for worksheets, row and column headers, a status bar, and more. It includes comprehensive features to provide a complete Microsoft Excel-like experience - even for your Excel power users - including charts, tables, shapes, sparklines, conditional formatting, functions and filtering and so much more. With support for seamless Excel import and export, you can easily integrate your existing spreadsheet data and create and share reports without any dependency on Microsoft Excel.
High-Performance Spreadsheet Engine
SpreadJS has been designed and optimized from the ground up for fast performance that can handle your most demanding spreadsheet files and datasets. The powerful Calc Engine offers 500+ functions in 19 Languages that includes statistical and financial functions, dynamic arrays and custom user defined functions that are optimized for big data, complex calculations, and advanced Excel models. Make your spreadsheets even more responsive by processing calculations in background threads using Calc Worker!
Complete Document Control
SpreadJS offers comprehensive control over your JavaScript spreadsheets, allowing developers to have precise control over what areas of the spreadsheet data - such as cells, rows, columns, sheets and formulas - can be accessed or edited by the user. With the extensive API, you can secure, manage and help eliminate risk such as for Regulatory compliance while keeping the same Excel spreadsheet functionality your users love online but in your controlled and secure environment.
Enhanced Add-Ons - Add Even More Capabilities
Give users a familiar, Excel-like spreadsheet experience with optional add-ons designed with spreadsheet power users in mind. The Designer Ribbon allows end-users to easily customize spreadsheets with an intuitive toolbar, while PivotTable helps users summarize, analyze, and explore complex data.
Extend the spreadsheet experience further with specialized capabilities for more advanced use cases. Enable natural-language spreadsheet insights with an AI Assistant and real-time, multi-user editing with the Collaboration Server. Add GanttSheet, DataCharts, and ReportSheet to support project planning, data visualization, and structured spreadsheet reporting.
JavaScript Spreadsheet Features
Import & Export Excel Files
Easily import/export Excel files in JavaScript. Load, modify, and save complex .xlsx files or export data to Excel or a database.
Interactive Forms
Create interactive JavaScript data entry forms with images, cell formatting, formulas, and form controls like buttons, listboxes, and combo boxes for dynamic input.
Financial Reports & Analysis
Build JavaScript spreadsheets for financial reports, budgeting, and business apps like Income Statements and Aging Reports for real-time insights.
Interactive Dashboards
Build interactive JavaScript dashboards with charts, sparklines, tables, and images—perfect for financial KPIs, project dashboards, gradebooks, and more.
Advanced Data Analysis
SpreadJS provides advanced data analysis with dynamic manipulation, extensive formulas, interactive visualizations, and pivot tables for powerful insights.
Interactive Diagram Creation
Add interactive flowcharts, spatial layouts, and mind maps to JavaScript apps for clear visualization of complex relationships and data insights.
Performance Benchmark
Experience high performance with seamless large dataset handling—our demo loads 2 million cells in under a second and adjusts properties instantly.
Import & Export Excel Files
Easily import/export Excel files in JavaScript. Load, modify, and save complex .xlsx files or export data to Excel or a database.
Import & Export the Optimized SJS Files
SpreadJS uses its .sjs file format to save and load spreadsheets, preserving all features, styles, and data for fully functional sharing within applications.
Import & Export XLSM Files
Import and export Excel Macro-Enabled Workbooks (.xlsm) in SpreadJS. Macros are preserved for Excel but cannot run in SpreadJS.
Import & Export XLTM Files
Import and export Excel Macro-Enabled Templates (.xltm) in SpreadJS. Macros are preserved for Excel but cannot run in SpreadJS.
Import & Export XLTX Files
Seamlessly import and export Excel template files (XLTX) to reuse predefined layouts, styles, and structures in your applications.
Exporting to PDF
Use savePDF method for direct PDF export in your JavaScript spreadsheet app, converting .xlsx files with options for margins, headers, footers, and orientation.
Import & Export CSV Files
Enables seamless .csv import/export for efficient data exchange with other applications.
Export Charts to Images
Export JavaScript charts as images in popular formats like PNG or JPEG, making it easy to share or embed high-quality visuals in reports, presentations, or websites.
Export Spreadsheet Range to HTML
Convert cell ranges or sheets to HTML with the toHTML method, including styles, gridlines, and headers for easy web integration.
Advanced Calculations
Supports over 500 built-in functions for comprehensive data analysis.
Create Formula Text Boxes
Enable users to view, edit, and create formulas with a formula text box, including a range selector button for easy cell referencing.
Formula Editor Panel
Simplify complex formulas with SpreadJS's Formula Editor—collapsible views, syntax highlighting, and tooltips for easy editing and debugging.
Custom Functions
Easily create and integrate custom functions tailored to your specific needs.
Dynamic & Spilled Arrays
Native support for dynamic arrays, allowing for flexible, real-time data calculations.
Iterative Calculations
Help solve problems by reusing previous results. The CalcEngine.goalSeek function enables what-if analysis and future value calculations for investments.
Formula Auditing
Extensive tools for tracing dependencies, precedents, and evaluating formula logic.
Array Formulas
Array formulas, often referred to as CSE (Ctrl+Shift+Enter) formulas, accept array arguments and return array values.
Table Formulas
SpreadJS supports total row formulas in tables, allowing users to quickly select and insert summary functions from a dropdown list.
Pivot Calculated Items (Optional Add-On)
The SpreadJS' Pivot Table Add-on lets users add custom calculated items in rows/columns, using formulas with constants or other pivot items.
Cell Types
Various cell types allow you to define the information entered and displayed in any cell, or use predefined dropdowns for easier data selection and validation.
Cell Drop-Downs
Effortlessly choose data with cell drop-downs. Create interactive forms with lists, date pickers, sliders, calculators, and color pickers.
Range Templates
The Range cell type allows custom rendering of data using a template, enabling views like card layouts, multi-rows, or KPI blocks without extra coding.
Drag Fill
Simplify data entry with Auto Drag Fill, which automatically populates similar or incremental values. Custom fill allows for programmatic data loading at runtime.
Data Validation
Data validation sets rules for cell entries and provides visual cues for invalid data, helping users correct inputs to meet database restrictions.
Auto Merging
SpreadJS enables AutoMerge for cell ranges, columns, and row/column headers, automatically merging neighboring cells when text matches.
Cell States
Define custom cell styles to indicate state changes (e.g., edit mode, hover, invalid, active, selected, read-only, changed) and create interactive input forms.
Focus Cell
Help users navigate large worksheets with Focus Cell, which highlights the active cell’s row and column using customizable, semi-transparent bands.
Named Cell Templates
Define reusable cell templates that combine styles, validation, and formatting rules to ensure consistency across worksheets and reduce repetitive setup.
Hyperlinks
Enables Excel-like hyperlinks in JS worksheet cells, allowing quick access to sheet locations, URLs, draft emails, and custom commands that function as buttons.
Input Mask Style
The Input Mask Style enforces a specific format for data accuracy. SpreadJS offers customizable styles with user-defined patterns, placeholders, and masking characters.
Barcodes
SpreadJS supports eleven barcode sparklines, including QR code, EAN-13, EAN-8, and others, which can be applied to any cell via formulas.
Rich Text In Cells
The Basic Rich Text feature lets you use multiple text styles in one cell, highlighting key information with bold, italic, various fonts, and colors—all in one place for visually appealing spreadsheets.
Rounded Cell Borders
Create polished, report-style worksheet layouts with rounded borders for cells, ranges, spans, and header areas.
Cell Formatting
SpreadJS offers extensive cell-level formatting options, including type, font, size, borders, colors, alignment, word wrap, indentation, padding, labels, orientation, validation, tags, and comments.
Image Rich Data
Store images directly in JS spreadsheet cells as structured data, enabling them to behave like standard values in sorting, filtering, formulas, and PivotTables.
Sparklines
Sparklines offer a compact visual representation of data trends, such as increases, decreases, minimums, maximums, stock levels, and costs, which can be embedded in any cell.
Conditional Formatting
Use conditional formatting to automatically highlight key information and spot trends in your data based on specified values.
What-If Analysis
Model changing inputs and evaluate potential outcomes with Data Tables, Excel-like Goal Seek, and What-If Scenario Analysis for more flexible forecasting and decision-making.
Filtering
Use the built-in Excel-like filter dialog for users to easily filter data or create custom filters to display relevant information according to your application's needs.
Slicers
Excel-like slicers provide a visual method for filtering spreadsheet data, including options for tables, items, charts, aggregations, and custom slicers found on consumer websites.
Globalization
SpreadJS supports English, Chinese, and Japanese, and allows for custom resource files for other languages. Its calculation engine offers 18+ language packages and custom function localization.
Search
Easily search spreadsheets with advanced options like case sensitivity, exact matches, wildcards, and cell ranges. Search text, tags, or formulas using the search method.
Form Controls
Create complex, interactive data entry forms for JavaScript apps with controls like buttons, checkboxes, combo boxes, and more using the addFormControl function.
Context Menu
SpreadJS offers an Excel-like context menu for right-click interactions, allowing easy customization by adding or removing options.
TableSheet
TableSheet offers fast, data-bound table views with a grid-like UI and calculation engine. It uses Data Manager to fetch, interact, and bind server data for efficient analysis.
Data Manager
The SpreadJS Data Manager simplifies connecting and binding business data to worksheets, cells, tables, and TableSheet using remote sources such as REST, OData, and GraphQL or local JSON, CSV, and XML data.
Shapes
Includes supports for Excel shapes and advanced data-driven shapes, enabling dynamic creation of interactive visuals like manufacturing plant layouts.
Picture Shape
The Picture Shape feature in SpreadJS lets you insert, move, resize, and format images, enhancing the visual appeal of your spreadsheets and dashboards.
Camera Shape
The Camera shape provides an instantly updating view of a spreadsheet range, ideal for dashboards, and supports movement, resizing, rotation, grouping, and Excel I/O operations.
Floating Objects
Add custom floating objects like pictures, logos, or HTML content atop sheet cells. Customize interaction using various properties for a tailored experience.
Designer Ribbon Component
Provides a familiar UI with a ribbon, formula bar, status bar, side panels, and context menus. Fully customizable ribbon for tailored spreadsheet experiences in JavaScript apps.
Pivot Tables
Optional support to enable Pivot Tables, including import/export of Excel Pivot Tables. Features Pivot Panel, Slicers, and context menus for efficient data grouping and analysis.
Gantt Chart Sheet
SpreadJS offers an optional Gantt Chart Sheet add-on with a data-bound DataTable and spreadsheet UI. Features include Timescales, Taskbars, Tasks, Calendar, and more.
ReportSheet
SpreadJS offers ReportSheet, an optional add-on for quick report creation within JavaScript apps. It supports report design with data entry, pagination, filtering, sorting, and conditional formatting.
DataCharts
Create advanced charts bound to SpreadJS' Data Manager; allowing developers to host charts as floating objects or integrate with template cells for dynamic visuals.
AI-Assistant
Add natural language intelligence to your JavaScript spreadsheets with the AI Assistant add-on. Enabling user-enter natural language formula creation, formula explanation, and PivotTable layout generation or analysis through simple text prompts.
Collaboration Server
Enable real-time, multi-user spreadsheet editing with the SpreadJS Collaboration Server. Built on a flexible OT-based framework, it synchronizes changes instantly, tracks user presence, and enforces permissions for secure, scalable collaboration.
Real Customers. Real Success.
Discover how developers are transforming their applications with SpreadJS. See what our customers are saying.
Ramp Labs
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SpreadJS allowed us to avoid spending significant engineering time rebuilding core spreadsheet functionality on the front end. Instead, we were able to focus our efforts on the agentic system, backend infrastructure, and performance. Ben Geist, Ramp Labs Research Engineer |
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Building Ramp Sheets: How SpreadJS Helped Ramp Labs Build an AI-Native Spreadsheet Experience Learn more about how Ramp Labs used SpreadJS to power the spreadsheet experience behind Ramp Sheets the #1 AI spreadsheet editor built for financial modeling and analysis. |
MsAntunes
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For our users, Excel compatibility is extremely important because people that are within this part of business, controllers, they're working with numbers. I've seen these people working within Excel, they know all the shortcuts! It's really important for them to feel free with this environment because that's where they live. It's how their minds operate. It's like their bread and butter. It's an everyday thing. Luís Kalil Bonturim Antunes, Systems Analyst and Marketing Lead at MSAntunes |
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From Email-Driven Spreadsheets to Automated Browser-Based Planning at MSAntunes See how MSAntunes replaced manual spreadsheet workflows with automated, browser-based financial planning, reducing processing time from DAYS to HOURS. |
Labforward
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Spreadsheets are an integral part of the ELN experience, and we wanted to offer scientists a familiar platform directly within our application. We were able to provide superior spreadsheet functionality with SpreadJS. Dr. Tomás Lopes da Fonseca, Head of Marketing at Labforward |
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Transforming Laboratory Data Management with Embedded Spreadsheets Learn how Labforward integrated SpreadJS into its ELN to give scientists a secure, familiar spreadsheet experience. |
Build Your Own JavaScript Spreadsheet
| Quick Start Guide | |
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| 1. Download the Latest SpreadJS Release or get it from npm. |
Download Full Trial |
| 2. Include the SpreadJS script and CSS files in the documents Head section. Replace “XX.X.X” with the release version downloaded. |
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| 3. Add a DIV container to host the JavaScript spreadsheet instance. |
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| 4. Initialize the JavaScript spreadsheet. |
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Learn more with our complete quick start guide for SpreadJS.
The Leading JavaScript Spreadsheet Library
Easy Licensing & Distribution
Generate Distribution Key/s for Your SpreadJS Applications via Your MESCIUS Account After Purchase
Licensing FAQs
SpreadJS is licensed per developer and deployed hostname. Hostname deployment licenses vary depending on whether the deployment is commercial or non-commercial.
Request a Trial Key
Our sales team can provide 30-day trial Distribution Keys for SpreadJS and the optional add-ons upon request, allowing you to deploy SpreadJS during your trial period.
Have Questions? We're Here to Help
Email us.sales@mescius.com to schedule a call with our product specialists or request a personalized demo through support to discuss your project needs.
What's New in SpreadJS v19.2
SpreadJS v19.2 is available! This release offers several new enhancements and features to its JavaScript spreadsheet component and new optional add-ons, including:
- New What If Scenario Manger - Save, compare, and switch between workbook scenarios with ease.
- Enhanced Data Binding - Bind worksheets, cells, and tables to DataManager.
- Ribbon KeyTips - Improve Designer accessibility and keyboard navigation.
- Progress Sparklines - Display visual in-cell progress, KPIs, and completion status with formula-based bars.
- Rounded Cell Boarders - Create polished layouts with rounded cell borders.
- Enhancements to the optional add-ons - Designer Ribbon, PivotTable, Collaboration Server, AI-Assistant, DataCharts, ReportSheet, & GanttSheet.
- UI and UX Enhancements - Improve usability with smarter spreadsheet filtering and input.
- Updated Framework Support - Add compatibility for Angular 22.
Award-Winning Products and First-Class Support
"I have been using a various form of Spread back to the COM days. Spread is the most reliable spreadsheet that retrieves and stores data, whether interacting with a database or simply an Excel file. Try it out, and you will not go back to any other control"
TRUSTED CUSTOMER
"Great support through evaluation process, Spread is my favorite development add-in, adds great, high value capabilities to applications!"
TRUSTED CUSTOMER
"Excellent Products. I have been using their products for around 15 years. Always there to help."
TRUSTED CUSTOMER
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