Free online OCR to PDF converter that turns a scanned PDF, PNG or JPG into a searchable PDF by adding an invisible text layer, so the pages can be searched and copied. It can also return the text on its own, and the page image is left untouched.
Document format work by OnlinePCApps since 2013
A scan is a picture of a page, so a reader sees text that a computer cannot. This converter adds the text back as a searchable layer.
A scanned contract or report opens as an image, so pressing find turns up nothing. Running OCR adds a text layer under the scan, and the entire document becomes searchable in any reader.
Selecting a paragraph on a scanned page highlights nothing, because there is no text to select. OCR recognizes the words and lays selectable text over them, so copying works without retyping.
A screen reader has nothing to say about a page that is only an image, so a scanned form or notice is closed to anyone who relies on one. A recognized text layer gives it real words.
Drop a scanned PDF, PNG or JPG onto the panel above or click to browse. The file card shows its name and size with Ready to scan, and Remove file swaps it for another.
Select Create searchable PDF or Extract text only. Type a 3-letter Document Language code like eng or eng+hin, Set Pages to Extract to All pages, First page, First 3 or a range like 1-5. Open Show Quality / DPI Settings for a Scan Resolution of 120 to 360 DPI.
Click Create Searchable PDF or Extract Text Only. The Results Summary lists Pages Processed, Language and Output, then Download searchable PDF saves the -searchable.pdf copy or the Extracted Text block saves ocr-result.txt. The scanned original is left untouched.
To OCR a PDF is to recognize the text in a scan and record it so a computer can use it. The online OCR to PDF converter offers that in two shapes, chosen under Choose output.
Recognized words are placed as invisible text at the exact spot of every printed word, under the page image. The scan looks identical, and find, copy and screen-reader access now work across the entire file, which downloads with a -searchable suffix.
The same recognition can hand back the words on their own as ocr-result.txt, ready to paste into a note, a sheet or an index. It is the fastest route when the words matter more than the layout, like figures pulled from a scanned invoice or receipt.
A 3-letter code like eng, spa or hin selects the model. A + joins two for a mixed page, with English + Hindi, English + Spanish and French + German ready as presets. The right code lifts accuracy sharply, since the model is trained per language.
The original pages are copied into the result rather than redrawn, so a signed scan or a stamped form stays pixel for pixel the same. Only the hidden text underneath is new.
To OCR a PDF, to make a scanned PDF searchable and to extract its text all name the same recognition step. The searchable copy is written new, and the scanned original is left as it stands.
Recognition is pattern matching, not magic, so the input decides what comes back. These are the limits worth knowing.
| The case | Result | What happens and why |
|---|---|---|
| Clean printed scan | 95 to 99% | Sharp printed text at 300 DPI or above comes through with high accuracy in a well matched language. |
| Low resolution | drops off | Below 200 DPI accuracy falls, and under 150 DPI it can sink to 70 or 80 percent as letters blur together. |
| Handwriting | out of scope | The engine is trained on printed type, so handwritten notes are mostly missed or misread. |
| Rotated or skewed | fix first | A sideways or slanted page confuses recognition, and there is no deskew option on the panel. Straightening it with Rotate PDF first restores accuracy. |
| Language | one code or two | The model is language specific and set by a 3-letter code. A + joins two codes for a mixed page. Running a document through the wrong code mangles accented letters. |
| Searchable PDF | image plus text | The page image is kept and an invisible text layer is added over it, so the file looks the same but searches. |
| Plain text | words only | The recognized text is returned on its own as ocr-result.txt, with no layout, for pasting or indexing. |
| Already has text | skip OCR | Some scans were recognized once already. If a word highlights when clicked, the text is there and OCR is not needed, as how a PDF stores text explains. |
| Scan resolution | 120 to 360 DPI | The page is rendered at 220 DPI by default, with Fast 180 and Detailed 300 presets and a slider from 120 to 360 under Show Quality / DPI Settings. Raise it for faint or blurry print. |
A Text Layer, Not a Rewrite
OCR does not retype or reflow a page. It looks at the pixels of a scan, works out the printed words and writes them as invisible text at the same coordinates, under the image a reader already sees. The picture is unchanged, which is why a signed contract or a stamped form stays exact while find and copy start to work. Accuracy rides on the scan, so a crisp 300 DPI page in the right language comes through cleanly while a faint or handwritten one does not, and a quick proofread always earns its minute. A searchable copy headed for long-term storage follows what PDF/A is and when it is needed. The standards below define the searchable and archival forms the result is written to.
Both turn a scan into searchable text. The online OCR to PDF converter differs in price, in the settings on the panel and in how many files go through per run.
| Point of comparison | This tool This OCR to PDF converter Recognized on the device | Hosted suites OCR bundled with an editor and a plan |
|---|---|---|
| Where the scan goes | Never leaves the device | Uploaded to a server |
| Price | Free with no page cap | Often billed per page |
| Deskew and cleanup | Not on this panel | Deskew, noise removal, PDF/A |
| An entire folder at once | One file per run | Batch on a paid plan |
| Top accuracy on hard scans | Good on clean print | Edge cases to a paid engine |
The bottom three rows go to the hosted suites, which offer deskew and cleanup, a folder per run and a paid engine for a hard page. The price row goes to this converter, which is free with no page cap and asks for no account. The rest of the trade is weighed in browser-based file tools.
Recognition here runs on an engine compiled to WebAssembly and run inside the browser. Each page is drawn to a canvas and read on the spot, so the scan and the text it yields both stay on the machine that opened them.
Nearly every other online OCR service sends the file to a backend such as Google Vision or AWS Textract to be read. Since a scan is often a contract, a medical record or an identity page, keeping recognition on the device takes that document off anyone else's infrastructure.
Every one of these recognizes text in a scan. They differ in cost, in control and in how many pages they handle per run.
Two of these need a paid app or a terminal, while the other two need an account or a key. The online OCR to PDF converter above asks for no app, terminal, account or key. It takes a PDF, PNG or JPG up to 100 MB.
A minute of setup lifts the accuracy of every page the converter returns.
Click a word on the page first. If it highlights, the file already carries text and OCR is not needed. Recognition is only for a page that behaves like a flat image.
Sharper input recognizes better. A scan at 300 DPI or above, sitting straight rather than skewed, gives recognition the clearest letters. The Detailed 300 preset under Scan Resolution helps faint print.
The model handles one language at a time best. Matching the 3-letter code to the document, rather than leaving it on eng, keeps accented and non-Latin letters from being mangled. A code like eng+hin covers a mixed page.
The online OCR to PDF converter handles one scan per run, which suits a document or two. A drawer of legacy scans, a long report or an archive headed for a search index is work for the desktop edition, which reads from disk and drives a heavier engine across every file.
Point it at a directory and every scan is recognized in one run, every one saved as a searchable copy beside its source.
A native engine works through a long document far quicker than a browser tab can, without a page cap or a wait between pages.
A store of paper scans can be turned searchable in bulk and saved as PDF/A, so an entire archive becomes findable at once.
Free, with no sign-up and no watermark. Turn a scanned PDF into a searchable copy with the online OCR to PDF converter, and keep the page image exactly as it is.