JPG vs PNG for OCR: Which Image Format Is Better?
By ScanText Team · 4 min read · 2026-09-03
Choosing the right image format affects how well OCR can read text. JPG and PNG are the two most common formats for saving image files, but they behave very differently when it comes to preserving text detail.
How JPG and PNG differ
- JPG uses lossy compression, which discards data to keep file sizes small. Fine details and sharp edges can become blurred, especially in areas with text.
- PNG uses lossless compression, which preserves every pixel. Text stays crisp, but files are larger.
- PNG supports transparency; JPG does not.
When JPG works well
JPG is a good choice for photographs of documents, notes, or signs taken with a phone camera. When saved at a high quality setting, JPG preserves enough detail for OCR to read clearly printed text.
When PNG works well
PNG is ideal for screenshots, digital documents, and graphics that contain text. Because PNG does not use lossy compression, the sharp edges of letters are preserved, making it especially suitable for interface text, code snippets, and screen captures.
Which format gives better OCR accuracy?
For text that originates on screen—such as screenshots, PDF pages, or digital documents—PNG generally provides better OCR accuracy because it preserves crisp edges. For photographs of physical pages, signs, or receipts, a high-quality JPG works well.
Practical recommendations
- If you are capturing a screen, save as PNG.
- If you are photographing a document, save the JPG at the highest quality.
- After a JPG has been heavily re-saved, consider taking a fresh photo or screenshot.
- Crop tightly around the text before uploading to both formats.
Where to use each converter
ScanText accepts both JPG and PNG images. Use the JPG converter for photos and the PNG converter for screenshots and digital documents.
Frequently asked questions
- Does PNG preserve text better than JPG? Yes, because PNG uses lossless compression.
- Does JPG compression affect OCR? Heavy compression can blur small letters and lower accuracy.
- Can I use both JPG and PNG? Yes, ScanText accepts both formats.