You need the numbers behind a chart in a PDF
You want the figures from a chart in a report or a white paper for your own spreadsheet, but the underlying data was never published. Reading them off the picture and retyping them is the only option — and a misread digit is impossible to catch afterwards.
Inside a PDF a chart is just lines, fills and characters; the numbers are not stored anywhere. A machine has to do what you would do by eye: work the value out from the axis ticks and the height of the bar.
🔴 What matters here is separating what was read from what was estimated. If a chart prints its values, we read them. If it does not, the value comes from the shape. PDFIntact never dresses an estimate up as a fact, because mixed together they end up in someone's report and the error travels.
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Check it on your own PDF
The check runs entirely inside your browser. Your file is never uploaded, and no account is needed. See how many pages, and how many tables and figures, can be extracted before you pay.
Example
確度の3段階
結果には、値ごとに次のいずれかが付きます。
測定
グラフや文書に書かれている数値を読み取ったもの。そのまま使えます。
推定
数値ラベルが無く、形状と軸目盛りから推定したもの。元のグラフと照合してください。
読み取り不可
判断できなかったもの。空欄にせず、そう表示します。
Frequently asked questions
- Can you read the numbers out of a chart in a PDF?
- Yes. Bar, line and pie charts are analysed and the series and values are exported as a table to Excel, Markdown or JSON. Where the chart prints its numbers, those numbers are read directly.
- What happens with charts that have no printed numbers?
- The values are estimated from the shape — the height of the bars, the position of the points — and the axis scale. Those are always labelled as estimates and never mixed in with read values, because an estimate presented as fact ends up quoted as one.
- Are there charts you cannot read?
- Several charts combined into a single figure are out of scope. Accuracy also drops where series overlap densely or where the legend distinguishes series only by colour. The check tells you before purchase what cannot be converted.
- Which formats can charts be exported to?
- Excel (tables and charts on separate sheets), Markdown and JSON. JSON also carries coordinates and confidence, so you can trace which page and which position a value came from. Charts can also be exported into Word alongside the body text.
Check any PDF against all symptoms／ What each format contains