Will this PDF
come out clean?

The symptom

This is what copying gives you

Common in papers and government documents. The page looks perfectly fine on screen, so there is no way to spot it by eye.

How we handle accuracy

We never mix what we read with what we guessed

Every value we output carries one of three labels. Text and tables are read from the document and cross-checked against its own text layer where one exists. Charts without printed numbers are estimated from the shape of the bars and lines, and are always marked as estimates. Anything we could not read is left out rather than guessed — because a wrong number that looks confident is worse than a gap.

グラフは弱点です。数値のラベルが図の中に書かれていないグラフは、 曲線や棒の高さからの推定になります。そのため確定値としては扱わず、推定値と分かる形で表示します。 グラフの数値を確定値として使いたい用途には、現状では向きません。 複数のグラフが1つの図に並んでいるものは対象外です。
一致率は「PDFの文字情報と突き合わせられた割合」であり、 文字情報を持たないスキャン文書には別の基準が要ります。

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We'll let you know about accuracy improvements and new output formats. The check itself is free and needs no account.