Find the angle each scanned page is off by and put it straight — a degree and a half, not the ninety degrees a rotate tool handles. Free in your browser — no sign-up, no watermarks.
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A page that went through the feeder slightly askew, or was photographed at a tilt, is out by a degree or two. That is too little for a rotate tool, which turns pages in quarter turns, and far too much to look right: crooked text is the single clearest sign that something was scanned badly rather than produced properly. It also makes OCR noticeably worse, because recognition works line by line and a sloping line is harder to read. The angle is measured from the text itself, page by page, so a stack where every sheet went in differently is handled.
PDF is the universal document format: it locks layout, fonts and images so a file looks identical on every device and printer. Scans, invoices, forms, e-books and reports all travel as PDF. Because a PDF is a container rather than an image, turning its pages into JPG or PNG pictures — or bundling pictures into a PDF — are among the most common file tasks there are.
Rotate tools turn pages in quarter turns, because that is what a page needs when it was scanned sideways. It is no help at all with the far more common problem: a sheet that went through the feeder slightly crooked, or a page photographed at a tilt. That page is out by a degree or two — too little for any rotate tool to address and much too much to look right.
Crooked text is the clearest possible signal that a document was scanned badly rather than produced properly. It is also a practical problem: OCR reads a page line by line, and a sloping line is measurably harder to recognise, so a tilted scan produces worse text as well as a worse impression.
No guessing is involved, and nothing needs to be labelled. Lines of text are the strongest horizontal structure on a page: when it is straight, adding up the ink across each row gives sharp peaks where the lines sit and almost nothing in the gaps between them. Tilt the page and those peaks smear into one another. So the angle at which the row totals are most uneven is the angle at which the text is level — a measurement, taken from the document itself.
Each page is measured on its own, which matters for a stack that was fed by hand, where no two sheets went in at quite the same angle.
They are left exactly as they are, rather than being nudged by a tenth of a degree for no reason. If every page in a document is straight, the tool says so instead of handing back a file that has been through a rendering pass for nothing.
Straightening moves pixels, so the pages have to be re-rendered — which means a scanned document stays a scanned document, and a text-based PDF put through this loses its selectable text. It is a tool for scans. If your pages are crooked and you want them searchable, straighten first and then run OCR PDF, which is the order that produces the better text anyway.
Eight degrees covers anything a feeder or a steady hand produces. The wider setting exists for photographs taken in a hurry, but the further a page is rotated the more of the corners get filled with white, so a badly askew photo is usually better re-taken than corrected.
Yes — completely free, with no sign-up, no watermarks and no daily quota. Processing happens in this browser, so the practical limit is the memory available on your device.
Yes. Add as many files as you like — each one is processed in sequence with its own progress status, and you can download the results individually or all together as a ZIP archive.
No. Pages are copied at the object level — text, fonts, images and vector content are carried over as-is, without re-rendering. The output keeps the same sharpness and searchable text as the original.
From the lines of text. When a page is straight, adding up the ink across each row gives sharp peaks where the lines are and almost nothing between them; tilt the page and those peaks smear together. The angle that makes those row totals most uneven is the angle at which the text is level — so it is measured from the content rather than guessed, and a page that is already straight is left untouched.
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