AI OCR
Extract searchable text from images and PDFs locally in your browser, with multilingual recognition and no file upload.
Upload an image or PDF to start local OCR.
Free Online AI OCR for Images and PDFs
Zolkit's AI OCR extracts searchable text from images and PDFs directly in the browser. Files stay on your device while the local OCR engine recognizes screenshots, scanned documents, IDs, invoices, forms, and multilingual text.
No file upload
Images and PDFs are rendered and recognized locally, so sensitive documents never need to leave your browser.
PDF OCR
Multi-page PDFs are rendered page by page and converted into searchable text that you can copy or export.
Image to text
Turn screenshots, phone photos, scans, and WebP images into editable text without installing desktop software.
9 OCR languages
Recognize Chinese, Traditional Chinese, English, German, Spanish, French, Japanese, Korean, and Russian text.
OCR preprocessing
Use grayscale, contrast boost, and scale controls to improve low-resolution or low-contrast source files.
TXT and JSON export
Download plain text for editing or structured JSON with page numbers, confidence values, and text box coordinates.
How to Extract Text with AI OCR
- 1
Upload or drag in a JPG, PNG, WebP, or PDF file.
- 2
Choose the recognition language and layout mode, then let the browser run OCR locally.
- 3
Search the recognized text, copy it, or download TXT and JSON results.
Frequently Asked Questions
Is online OCR safe for private documents?
Zolkit AI OCR is designed for private documents because recognition runs in the browser and files are not uploaded to a server. The OCR worker, WebAssembly runtime, and language data are served as site assets and execute locally on your device.
Can OCR extract text from scanned PDFs?
Yes. Zolkit AI OCR renders each PDF page into an image and runs OCR on that page, which works for scanned PDFs that do not already contain selectable text.
Which OCR languages are supported?
Zolkit AI OCR supports Chinese, Traditional Chinese, English, German, Spanish, French, Japanese, Korean, and Russian. Language choices are shown simply to users, while the OCR engine can still include English internally for mixed documents.
Why is OCR accuracy lower on some images?
OCR accuracy depends on resolution, blur, contrast, rotation, font quality, and background noise. For better results, use a sharper image, increase the recognition scale, enable contrast boost, and choose the layout mode that matches the document.
What file formats can I use for OCR?
Zolkit AI OCR accepts JPG, PNG, WebP, and PDF files. Each file is processed locally, and large or very high-resolution files may take longer because recognition happens on your device.
Can I export OCR results with coordinates?
Yes. The JSON export includes recognized text, page numbers, confidence scores, and bounding boxes for recognized text regions. The TXT export is better when you only need editable plain text.