Ask in plain language
Start with the question you actually need answered.
Spreadsheet analysis you can verify
Turn a spreadsheet into a clear, checkable answer.
Upload a workbook, ask a business question, and get a chart-led result with the calculation behind every number.
Watch the synthetic sales sample and download every file, no account needed.Monthly net salesSYNTHETIC DATA
$23,050
+50.54%
($13,850 − $9,200) ÷ $9,200 = 50.54%See the evidence
Results keep source rows, steps, and assumptions close at hand.
Export useful work
Download data snapshots and charts for the next conversation.
Watch a real analysis, then download it
Two CSV files went in: 16 order rows (one duplicated) and a product list. The question was to total net and gross sales by month, rank products, split sales by region and check the numbers. Seven files came out. Every one of them is below, so you can open the Excel workbook and check the 50.54% month-over-month figure yourself.
Input files
- orders.csv690 B16 order rows, one duplicate
- products.csv77 BProduct and category lookup
Delivered files
- analysis-result.xlsx17.8 KBSummary plus 4 result sheets with native Excel charts
- table-1.csv125 BMonthly sales summary
- table-2.csv155 BTop products by net sales
- table-3.csv119 BSales share by region
- table-4.csv430 BSource reconciliation
- analysis-result.json6.8 KBTables, charts, checks and notes as structured data
- dashboard.html8.0 KBOffline dashboard, opens in any browser
What ToCharts does with your spreadsheet
ToCharts is an AI spreadsheet analyst. It answers business questions about your data, shows how each number was produced and hands back files you can keep working with.
Ask in plain language, then follow up
Describe the comparison, total, trend or chart you need the way you would ask a colleague. Follow-up questions build on the previous result instead of starting over.
- Monthly totals, growth, shares and rankings
- Joins across several files by a shared key
- Follow-ups reuse the earlier inputs and result
Calculated in code, not guessed
The Agent inspects your columns, then runs the calculation as Python in an isolated sandbox. Totals are reconciled against the source before the result is accepted.
- Data inspection before any calculation
- Totals audited against the input rows
- Results that fail validation are not delivered
Charts and tables that match
Each result has tables and the charts built from them, so the picture and the numbers always agree. Bar, line and pie charts cover most business questions.
- Several result tables per question
- Bar, line and pie charts
- Chart data is the table data, not a redraw
Files you can keep working with
Download an Excel workbook with native charts you can restyle, a CSV for each table, the structured JSON and an offline HTML dashboard. Ask for a PPTX when the result is going into a meeting.
- XLSX with native Excel charts
- CSV per table, plus JSON
- Offline HTML dashboard; PPTX on request
Every step written down
The execution log names each step in business terms: reading files, inspecting data, running the calculation, checking totals. Technical details stay one click away for anyone who wants them.
- Readable step names and timings
- Validation results beside the answer
- Assumptions listed in the notes
More than one kind of input
Add the spreadsheet together with the context that explains it: a PDF report, a Word brief or a PowerPoint deck. The Agent reads them as reference for the analysis.
- CSV, TSV and XLSX data
- Text PDF, DOCX, PPTX, TXT and HTML context
- Up to 5 files in one question
A short path from file to finding
The workspace keeps the analysis visible while you refine it.
Add data
Upload CSV, TSV or XLSX, plus any PDF, Word or PowerPoint context.
Ask a question
Describe the comparison, total, trend, or chart you need.
Review the steps
Read the step log, the total checks and the assumptions.
Use the result
Download Excel, CSV or the HTML dashboard, or ask a follow-up.
Every number comes with its working.
A conclusion is useful only when you can trace it. ToCharts keeps formulas, inputs, row counts, and assumptions beside the result.
- ✓Formula and substituted values
- ✓Input fields and rows used
- ✓Assumptions and source steps
How month-over-month is calculated
(13,850 − 9,200) ÷ 9,200 = 50.54%Inputs: Net Sales · 15 orders after de-duplication
Assumption: Month comes from Order Date; USD values are not converted.
30 worked examples across 10 industries
Each case has its own input CSV, prompt, Excel workbook, offline dashboard and short video. The metrics below are calculated from the input file, not typed in.
Retail · Business contributionStore net sales and contribution
- Net sales
- 992,200 CNY
- Contribution
- 355,200 CNY
- Contribution margin
- 35.8%
E-commerce · Time trendsMonthly visitor-to-payer conversion
- Visitor-to-payer conversion
- 2.67%
- Total paying buyers
- 9,245
- Total unique visitors
- 346,000
Food service · Business contributionMenu item contribution
- Menu revenue
- 102,320 CNY
- Ingredient contribution
- 63,730 CNY
- Contribution rate
- 62.28%
Manufacturing · Efficiency & qualityProduction first-pass yield
- First-pass yield
- 97.78%
- Total first-pass units
- 66,200
- Total units first inspected
- 67,700
Software services · Time trendsMonthly recurring revenue bridge
- June ending MRR
- 193,000 CNY
- Six-month net new MRR
- 93,000 CNY
- Ending MRR growth
- 93%
Travel & hospitality · Time trendsHotel occupancy and room yield
- Overall occupancy
- 76.75%
- Average daily rate
- 425.8 CNY
- Revenue per available room
- 326.81 CNY
Synthetic operating data. Result files and chart labels are in Chinese.
Browse all 30 cases →What goes in, what comes out
These are the limits the workspace enforces today, so you can tell before uploading whether a question will fit.
- Data files
- CSV · TSV · XLSXConvert old .xls files to .xlsx first
- Context files
- PDF · DOCX · PPTX · TXT · HTMLText PDFs; scanned pages are not OCR’d
- Per question
- Up to 5 files · 10 MiB total
- Charts
- Bar · Line · Pie
- Workbook
- XLSX with native chartsValues, not the source workbook’s formulas
- Tables
- CSV per table · JSON
- Sharing
- Offline HTML dashboardNo external scripts or CDN
- Slides
- PPTX chart deckWhen you ask for it
Who ToCharts is for
People who live in spreadsheets but do not want to build every pivot by hand.
Operations and finance analysts
Turn monthly exports into reconciled summaries with the working attached, ready for review.
Sales and e-commerce teams
Rank products, compare regions and track conversion or return rates without rebuilding the same pivot every week.
Founders and small business owners
Ask direct questions about revenue, costs and customers and get an answer you can check.
Restaurant, retail and hospitality managers
Follow margin, waste, occupancy or labour productivity across stores or properties.
Educators and training teams
Summarise attendance, assessment and renewal data for each class or cohort.
Anyone preparing a report
Get the tables, charts and an editable workbook in one pass, then drop them into a deck or document.
ToCharts compared with doing it by hand
Excel is still the right place for detailed modelling. ToCharts takes over the repetitive part between a raw export and a reviewed answer.
| Step | By hand in a spreadsheet | With ToCharts |
|---|---|---|
| Cleaning | Find duplicates and blanks with filters | Inspected and reported before calculating |
| Joining files | Write lookups between sheets | Joined by a shared key you can name in the question |
| Calculating | Build pivots and formulas | Python in a sandbox, totals reconciled |
| Charting | Insert and format each chart | Charts generated from the result tables |
| Explaining | Write up the method separately | Steps, checks and assumptions delivered with the result |
Where ToCharts is not the best fit
Knowing the edges saves time.
- Large datasets: one question accepts up to 5 files and 10 MiB in total. Split or aggregate bigger exports first.
- Scanned documents: PDFs must contain text. Images of tables are not read with OCR.
- Live formulas and macros: the Excel export contains values and native charts, not the formulas or macros from your source workbook. Macros are never run.
- Live connections: ToCharts works on files you upload. It does not connect to databases, BI tools or cloud drives.
- Why questions: results describe what the data shows. Treat any explanation of why a number moved as a hypothesis to check, not a proven cause.
- Complex modelling: forecasting, scenario models and financial models still belong in a dedicated tool or a spreadsheet you control.
Pay for the analysis you run
AI analysis uses EndTo credits. Credits are reserved when you submit a question, settled against actual usage when it finishes, and anything unused is returned.
The sample, the 30 cases and the free chart tools need no account.
See credit packs →Your data stays private
Uploaded files and results are stored with your EndTo account so you can reopen an analysis and ask a follow-up.
Downloads are checked against your account, and no analysis is ever published as a public page.
Privacy policy →Free chart and spreadsheet tools
Make a bar, pie or line chart in your browser, or learn which chart fits your data — no sign-up needed.
Bar Graph MakerType or paste numbers, get a clean bar graph, download SVG or PNG.Pie Chart MakerTurn parts of a whole into a pie or donut chart with honest percentages.Line Plot MakerPlot a trend over time and read the turning points, not just the endpoints.Spreadsheet AI AgentWrite the brief an agent can actually execute — scope, metrics, outputs, checks.AI Spreadsheet GeneratorDescribe the model you need and get a structured, formula-backed workbook.Chart ExamplesTwelve worked examples with the reason each chart type was chosen.What Are Charts?The five jobs a chart can do, and how to pick the right one in four questions.
Frequently asked questions
What is ToCharts?
ToCharts is an AI spreadsheet analyst from EndTo.AI. You upload CSV or Excel files, ask a business question in plain language, and get tables, charts and a written summary, with the steps and checks behind every number and files you can download.
Which files can I upload?
Data in CSV, TSV or XLSX, plus context documents in text PDF, DOCX, PPTX, TXT or HTML. You can add up to 5 files with a combined size of 10 MiB to one question. Convert legacy .xls files to .xlsx first.
How do I know the numbers are right?
The calculation runs as code in an isolated sandbox, totals are reconciled against the input rows, and the result lists its checks, assumptions and steps. The downloadable Excel and CSV files let you recompute any figure yourself.
What do I get back?
An Excel workbook with a summary sheet, result sheets and native charts, a CSV for each table, the structured JSON and an offline HTML dashboard. You can also ask for a PPTX chart deck.
Does the Excel file keep my formulas?
No. The exported workbook contains the calculated values and native charts. Formulas and macros from your source workbook are not preserved, and macros are never run.
Can I ask follow-up questions?
Yes. A follow-up reuses the files and result of the earlier analysis, so you can drill into a month, change a breakdown or add a chart without uploading again.
Which charts can it make?
Bar, line and pie charts, each built directly from a result table. For a quick chart without AI, the free bar, line and pie chart makers work in your browser.
Can I try it without my own data?
Yes. The sales sample replays a complete analysis and lets you download every input and output file, and the case library has 30 more worked examples across 10 industries. None of these need an account.
How is it priced?
AI analysis uses EndTo credits: they are reserved when you submit, settled against actual usage, and unused credits are returned. The sample, cases and free tools cost nothing.
Is my data private?
Yes. Files and results are stored with your EndTo account, downloads are checked against your account, and analyses are never published as public pages.
Keep reading
Bring the spreadsheet you already have.
Watch the sample to see exactly what an analysis delivers, then upload your own file when you are ready.