The editor
How to edit text in a scanned PDF — without uploading it
Short answer: you can, right here, for free. QuillPDF runs OCR on scanned pages in your browser, turns every recognized word into something you can click and retype, and exports a page where the change is real. The scan never leaves your tab — and scans are so often the sensitive ones: signed contracts, IDs, records.
Why a scan is the hard case
A scanned page is a photograph of text. There are no letters in the file for an editor to change — just pixels that look like letters. So most PDF tools do one of three things with a scan: refuse to edit it, offer to make it merely searchable, or quietly upload it to a server for conversion. If the document is a signed agreement or a medical record, that upload is exactly what you didn't want.
How QuillPDF edits a scan in your browser
- The editor detects which pages are scans (no real text layer).
- It runs OCR on those pages locally — the engine and language data are served from QuillPDF's own origin and run in your tab, never on a server, never from a third-party CDN.
- Every recognized word becomes an editable target. Click it, retype it.
- On export, the original word is covered and your replacement is set in a matching standard typeface at the same spot. The page is flattened — the edit is a permanent part of the document.
Hard scans — faint toner, noise, skew — get an adaptive rescue pass that recovers pages basic OCR gives up on. Low-confidence words are filtered out rather than guessed at.
What it won't pretend to do
Your replacement text is set in a clean standard typeface — it reads naturally, but it is not a forgery-grade clone of the scanned font. Handwriting isn't supported; the engine is built for printed text. And OCR is recognition, not magic: review the result before you rely on it. We'd rather put the limits on this page than in your export.
The part that matters: it all stays in the tab
Everything above — detection, OCR, editing, export — happens in your browser, on your own hardware. The editing tools never upload, transmit, or store your file on any server. Open your DevTools Network panel while you edit and watch for yourself: no file leaves. Once the editor has loaded, it keeps working with your network disconnected.
Questions people ask
Can you edit the text in a scanned PDF for free, without uploading it?
Yes. QuillPDF's editor detects scanned pages, runs OCR (optical character recognition) on them right in your browser, and turns every recognized word into an editable target. You click a word, type the correction, and export. The file never leaves your browser tab — you can confirm that in your browser's DevTools Network panel while you work.
Why can't most PDF editors edit a scan?
A scanned page is a photograph of text — there is no text in the file to edit, just pixels. Most editors either refuse the page, only let you make it searchable, or send the file to a server to be converted. QuillPDF instead recognizes the words in your browser and lets you edit them in place.
What does the edited page actually look like?
Your replacement text is set in a clean standard typeface (Helvetica, Times, or Courier family) sized and positioned over the original word, and the original is covered beneath it. It reads naturally, but it is not a pixel-clone of the scanned font — QuillPDF doesn't pretend otherwise. The export is flattened: the change is a real, permanent part of the page.
How accurate is the OCR?
Clean printed scans recognize nearly perfectly. Hard scans — low contrast, noise, skew — automatically get an adaptive rescue pass that recovers pages basic OCR fails on. Low-confidence recognitions are filtered rather than guessed. As with any OCR, review the result before you rely on it.
Does it work on handwriting?
No. The OCR engine is built for printed text. Handwritten pages won't produce reliable editable targets, and we'd rather tell you that here than let you find out after an export.
What if I just want the scan to be searchable, not edited?
Use the OCR PDF tool instead — it adds an invisible, selectable text layer over the scan without changing how the page looks. Same engine, same privacy: it runs entirely in your browser.