PNG to Text: How to Convert PNG Images to Editable Text

PNG is the format of screenshots, diagrams, and anything with sharp edges. Unlike JPG, it compresses without throwing away a single pixel, which makes it the best format for OCR: the letters arrive exactly as they were drawn, with no softening and no artifacts. If you have a choice of format for a scan or a screenshot, PNG is the one to pick — and converting a PNG to text is usually the most accurate conversion you can get.

This guide explains how to convert a PNG to text, why PNG reads better than JPG for small print, and when the format makes no difference at all. The conversion itself takes seconds on the image to text converter on the home page — upload the PNG, download the text. For the general method, see how to convert an image to text; for camera photos, the JPG to text guide covers the format you will meet most often.

Why PNG Reads Better Than JPG

How OCR works: upload, recognize, proofread, export

PNGJPG
CompressionLossless — every pixel exactLossy — fine detail discarded
Small textSharp edges preservedEdges softened, artifacts appear
ScreenshotsDefault format; ideal inputLarger file and blurrier text
PhotosLarger files than JPGSmaller files; usually fine for large text
Best forScreenshots, scans, diagramsCamera photos, large print

The difference is compression. JPG is lossy: it throws away fine detail to make the file smaller, and the detail it throws away first is exactly the detail that defines small letters — thin strokes, sharp corners, the dot over an "i". PNG is lossless: the file is compressed by finding repeated patterns, not by discarding information, so every pixel comes back exactly as it was. A PNG of a page of text is a pixel-perfect copy of the original; a JPG of the same page is a very good approximation.

How much that matters depends on the size of the text. For a headline, it does not matter at all — the letters are huge, and JPG's softening is invisible at that scale. For body text at 11 or 12 points, it matters a little: JPG typically costs one or two accuracy points, which is a few extra wrong letters per page. For small print — footnotes, receipts, the fine print on a form — it matters a lot: the letters are only a dozen pixels tall, and JPG artifacts are the same size as the strokes, so the engine starts confusing "e" with "c", "rn" with "m", and "1" with "l".

That is why screenshots are almost always PNG. Operating systems save screenshots as PNG by default, because a screenshot is mostly flat areas of color and sharp edges — exactly the content PNG compresses well and JPG compresses badly. A screenshot saved as JPG is not only larger than the PNG, it is also blurrier, which is the worst of both worlds. If you are converting screenshots to text, the PNG you already have is the best possible input.

There is one case where PNG's advantage disappears: when the PNG was made from a JPG. Converting a JPG to PNG does not restore the detail the JPG threw away, and the OCR result will be the same as converting the JPG directly. PNG helps when the image was created as a PNG — a screenshot, a scan saved as PNG, an export from a program — not when it was converted after the fact.

How to Convert a PNG to Text

The steps are the same as for any image, and they take under a minute.

First, check the image. Open the PNG and confirm the text is the right way up and fills the frame. Screenshots often contain the whole screen, including browser toolbars and taskbars that have nothing to do with the text you want. Crop those out before uploading: they add nothing, and they can confuse the layout analysis that decides the reading order. If the screenshot is of a long page, it may be worth splitting it into sections, because very tall images with small text read worse than the same content split into two images.

Second, upload the PNG to the converter. On SnapText, drag it onto the home page or click to choose it. The free plan accepts PNGs up to 10 MB; paid plans accept up to 25 or 50 MB. A full-screen PNG screenshot is usually under 2 MB, and a scanned page saved as PNG is usually 1 to 5 MB, so the limit is rarely a problem. If your PNG is larger, it is probably a very high-resolution scan, and it will still convert fine.

Third, set the language. English is the default, and it is right for most screenshots. If the text is in another language, select it before converting — the language model matters as much as the image quality. For pages that mix English with another language, see the guide on multi-language OCR.

Fourth, choose the export format. TXT is enough for copying into a message or a document. DOCX gives you an editable Word file. Searchable PDF keeps the original image and adds a text layer, which is the right choice for archiving. JSON gives you the text plus every word's position and confidence, which is useful if you are feeding the result into another program. Exporting several formats costs nothing extra — SnapText counts one image as one page regardless of how many formats you download.

Fifth, proofread using the confidence report. Every page shows a mean confidence score, and words below 60 percent confidence are listed for you to check. PNG screenshots of clean text typically score above 95 percent, which means a light skim is enough — but still check the numbers. A misread digit in a total, a date, or an error code is the kind of mistake that matters, and digits are the characters OCR confuses most often.

PNG Screenshots: the Most Accurate Case

A screenshot is the best input OCR can get, and it is worth understanding why, because it tells you what to aim for with other images. A screenshot has perfect contrast: pure black text on pure white background, or the exact colors the program drew. It has no blur, no shadow, no perspective distortion, and no camera noise. The letters are exactly as the font designer drew them, at exactly the size the program rendered them. The only thing that can go wrong is the text being too small — and even then, a screenshot at normal resolution usually renders body text at 12 to 16 pixels tall, which is comfortably above the floor for reliable recognition.

This is why converting a screenshot to text feels almost magical compared with photographing a page. If you have a document open on screen and you need its text, taking a screenshot and converting it is faster and more accurate than printing it and scanning it, and far faster than retyping it. The same applies to error messages, chat conversations, tables in a PDF you cannot copy from, and forms on a website. If it is on your screen, a screenshot plus OCR is the fastest way to get it as text.

There is one exception: screenshots of very small text, such as a dense spreadsheet with 8-point type, or a terminal window with a tiny font. Zoom the application in before you take the screenshot — Ctrl and plus in most browsers and editors — and the text will be larger in the image and read more accurately. The guide on converting screenshots to text covers this in detail.

PNG Scans: When to Choose PNG Over JPG

If you are scanning a document yourself, the scanner software usually offers a choice of format. Choose PNG when the document has small text, fine print, diagrams with labels, or handwriting — anything where sharp edges matter. Choose JPG when the document is mostly photographs, or when file size matters more than the last point of accuracy, such as a quick scan you will throw away after reading.

The trade-off is file size. A scanned page saved as PNG is typically two to five times larger than the same page saved as JPG at high quality — 2 to 5 MB instead of under 1 MB. For a single page that does not matter. For an archive of ten thousand pages, it is the difference between 20 GB and 100 GB of storage, which is a real cost. Archives that scan at scale, including the Library of Congress digitization programs, usually store a lossless master and serve a compressed copy, and OCR is run on the master or on a high-quality derivative — never on a heavily compressed copy.

If you already have scans saved as JPG, do not re-scan them as PNG just for OCR unless the results are actually bad. A high-quality JPG scan reads at 97 to 99 percent accuracy, and the gain from PNG is a fraction of a point. Spend the effort on the pages that read badly, not on the ones that already read well.

PNG Transparency and Other Gotchas

PNG supports transparency, and that can cause a surprise. A PNG with a transparent background — a logo, a diagram exported from a design tool, a screenshot of a window with rounded corners — has no background color of its own. When OCR reads it, the transparent areas are usually treated as white, which is fine. But if the text is white and the background is transparent, the software may see white text on a white background and return nothing. If a PNG converts to empty text even though you can see the words, check whether the image has transparency: open it in an image editor, flatten it onto a white background, save it, and convert again.

A second gotcha is the PNG that is really a photo. Some phones and apps save camera photos as PNG, and a PNG photo has the same problems as a JPG photo — blur, shadow, perspective — because the problems are in the picture, not the format. PNG does not fix a bad photo; it only preserves a good image perfectly. If your PNG is a photo of a page, follow the advice in the guide on how to improve OCR accuracy: fill the frame, hold the phone parallel to the page, and use even light.

A third gotcha is size. PNGs of very large scans — an A3 poster at 600 DPI, for example — can be 50 MB or more, which exceeds the free plan's 10 MB limit. The fix is simple: split the image into sections, or save it at a lower resolution. Text only needs about 300 DPI to read reliably, so a 600 DPI scan can be halved without losing accuracy, and the file becomes a quarter of the size.

Batch Converting PNGs

PNG is the format of screenshots, and screenshots come in batches: a whole error log, a set of lecture slides, a folder of scanned forms. SnapText's Starter plan converts 50 images at once and Pro converts 200, which turns an afternoon of one-by-one conversion into a single upload. The result is one ZIP with the text files and a CSV report.

The report is the key to batch work. It lists every PNG with its mean confidence and status, so you can sort by confidence and proofread the worst pages first. A batch of screenshots will mostly score above 95 percent; the pages below 80 percent are the ones to look at. They are usually the screenshots with the smallest text, or the ones where a dialog box covered part of the content. Proofreading by confidence is faster than proofreading in order, and it is the difference between a batch job that takes twenty minutes and one that takes two hours.

The Short Version

PNG is the best format for OCR because it is lossless: every pixel arrives exactly as drawn, and small text keeps its sharp edges. Screenshots, which are PNG by default, are the most accurate input you can give an OCR engine. Convert a PNG the same way as any image — upload, set the language, pick the export format, proofread the flagged words — and watch out for transparency, which can hide white text on a transparent background. If you have the choice when scanning, save text-heavy pages as PNG; if you already have JPGs that read well, do not bother re-scanning them.

References

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