Guides · Practical guide · Updated 23 October 2026

How to improve Czech OCR and correct diacritics

Missing diacritics after OCR often relate to the recognition language or scan quality. Setting Czech helps, but from blurry letters it cannot always get the correct text. The best results start with a readable source.

Try it free in the editor

Step by step

Select one representative page with Czech words and numbers.
In the Page panel, set the corresponding OCR language, for example, Czech + English.
Use Re-OCR this page and wait for completion.
Compare names, addresses, amounts, and characters č, ř, š, ž, and ě with the original image.
If the result is satisfactory, proceed with the other pages. If not, try to get a sharper and flatter scan.

Why source quality matters

Small dashes disappear with blurring, strong compression, or shadow on the book spine. When scanning again, keep the page flat and evenly lit. Simply zooming in on a blurry image does not restore lost details.

Mistakes to check manually

Similarly, O and 0, l and 1, or rn and m may look alike. In amounts, check decimal commas, thousand separators, and signs. In tables, also verify the correspondence of values to columns.

OCR before translation

An error in recognized Czech or foreign text may change the subsequent translation. Correct the source text first and then translate. Automatic check does not replace comparison with the original.

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