OCR Russian PDF — Cyrillic recognition
Make scanned Russian PDFs searchable. Tuned for Cyrillic script with proper handling of accented characters and ligatures.
Russian OCR uses the Cyrillic alphabet, which has 33 letters in modern Russian. Some letters look similar to Latin but represent different sounds (Р is 'R' not 'P', Н is 'N' not 'H', С is 'S' not 'C'), which can confuse English-trained OCR engines that fall back to Latin character recognition. PDFOnly uses Tesseract's dedicated Russian language pack, which is trained specifically on Cyrillic and handles the alphabet correctly.
Use cases: digitizing scanned Russian-language contracts and business documents; processing Russian customer support tickets attached as PDFs; making Russian academic papers and books searchable; or building searchable archives of Russian-language news and historical documents. The Russian language pack also handles older spellings (pre-1918 reforms) reasonably well, useful for scanned historical documents.
Related tools
Frequently asked questions
Will pre-1918 Russian spelling be recognized?
Reasonably well for the most common cases (the obsolete letters ѣ, і, ѳ, ѵ). For systematic processing of pre-revolution documents, you may want a specialized historical Russian OCR pipeline; standard Tesseract handles the basics.
Can I OCR a mixed Russian + English document?
Yes — specify both languages in the picker. Useful for scientific papers, technical documentation with English code, or documents with proper names retained in Latin characters.
What about Ukrainian, Bulgarian, or other Cyrillic-script languages?
We support those as separate language packs (Ukrainian, Bulgarian, Serbian, Belarusian, Macedonian, Mongolian). Pick the right language for your source document — using the wrong Cyrillic language pack drops accuracy significantly because letter frequencies and combinations differ.