Rotate PDF Pages

Rotate PDF pages: save the new orientation in the file so every viewer shows it

Rotating a PDF page means changing the display orientation recorded for that page and saving the result as a new PDF. As soon as you open a file, this tool reads the text direction on every page, marks the pages that lie sideways or upside down, and straightens all of them when you press [Straighten n pages]. For a scan with no text layer, click the edge of the enlarged page that should be the top and that edge moves up.

For example, open the sample PDF (8 pages, 209 KB) and the tool finds that the text on pages 3, 4 and 8 is sideways or upside down and straightens them, leaving only page 6, which has no text layer, for you to check. The file saved after fixing page 6 as well is 210 KB, because only 766 bytes of orientation records are appended to the original. The original text and images are not rewritten, and the PDF you choose is never sent to a server; it is processed inside the browser you are using.

When you need to rotate PDF pages

• A scanned page lies on its side: scanners and phone scanning apps save the paper the way it was placed, so a sheet fed in landscape ends up sideways in the PDF.
• Only the backs come out upside down in a double-sided scan: if the binding-edge setting does not match the paper, the even pages (the backs) can be saved flipped top to bottom. Choose [Even pages] and press [180°] to fix them all at once.
• A landscape table or drawing sits sideways among portrait pages: a table printed sideways on portrait paper needs the page turned 90° right or left before it reads as a landscape page on screen.
• You are tidying the orientation before sending or printing: turning the view in a PDF viewer does not stay in the file. To make the document open correctly for the person who receives it, the rotation has to be saved in the file. The difference is explained below under "View rotation vs. page rotation".

How to use it

1. Drop the PDF on the workspace or press [Choose PDF]. If it is your first time, press [Open sample PDF] to try the 8-page mock inspection report. The sample opens already straightened to match its text direction, and [Undo] shows how it looked at the start.
2. If the text direction line reports sideways pages, press [Straighten n pages]. In the orientation strip, a page with an accent-colored edge is a page that still lies on its side.
3. For a page with no text (the dotted tile), click it in the strip or the page sheet to bring it into the enlarged view, then press [This side up] on the edge the picture's top points toward.
4. To turn several pages the same way, click pages in the page sheet, or select them with [Odd pages], [Landscape] or page numbers, then press [Left 90°], [Right 90°] or [180°]. With nothing selected, these buttons apply to every page.
5. Press [Save PDF]. A new PDF is downloaded with "_rotated" at the end of its name, and the original file is not changed.

How to read the orientation strip, the enlarged view and the page sheet

• The orientation strip lays the whole document out in one row. Each tile draws the page's current shape (portrait or landscape), and its thick edge marks the top of the text. A dark thick edge on top means the text is upright; an accent-colored edge on the side or bottom means the page still lies sideways. A dotted tile is a page with no text layer, so its direction could not be read, and a pale accent background marks a page you turned this session. Click a tile to see that page in the enlarged view.
• The enlarged view shows one page large. The [This side up] labels on the right, bottom and left edges are set so they read correctly once that edge becomes the top. Click the label that runs the same way as the text on the page and that edge moves to the top. On pages whose text direction was read, the label to click is highlighted.
• The thumbnails in the page sheet really turn the way you rotate them, and turned pages carry a tag such as "↻ 90°" or "180°". The accent dot at the top right means the text still lies sideways, and the check at the top left means the page is selected. The ↺ ↻ buttons under a card turn only that page.
• Keyboard: move between pages in the page sheet with the arrow keys and select with Space or Enter. The R key turns the page 90° right, L turns it 90° left, and Ctrl+Z (Cmd+Z on a Mac) undoes one step.

View rotation and page rotation are not the same

If you rotated a PDF in a viewer and it lies on its side again after you save and reopen it, you most likely turned only the on-screen view. View rotation changes how the page is shown right now and leaves the file's contents alone, so the file opens in its original orientation once it is closed or sent to someone else. Adobe's help says the same about Acrobat: [View > Rotate view] is a change you can't save, the original orientation returns the next time you open the PDF, and to save the rotation with the document you rotate the pages under [Organize Pages]. A rotation made in a browser's built-in PDF viewer cannot be counted on to be saved in the file either.

Page rotation writes a rotation value (Rotate) into the page information inside the file. The PDF standard (ISO 32000-1, Table 30) defines it as the number of degrees by which the page is rotated clockwise when displayed or printed; it must be a multiple of 90, and a page without the entry is treated as 0°. A PDF with the rotation saved looks and prints the same way in any viewer. This tool changes only that value and does not redraw the page's text or images.

The rotation value is added to the current one

The rotate buttons do not fix a page at a particular angle; they add an angle to its current orientation. Right 90° is clockwise, Left 90° is counterclockwise, and Left 90° is the same as adding 270° to the rotation value. Some pages already carry a rotation of 90° so that they show as landscape (sample page 5), so [Original] is not a button that sets 0°; it puts the page back to the value that was read when the file was opened.

Under the enlarged view, "PDF rotation a° → b°" shows the value the file started with and the value that will be saved. The wording just above it, such as "turned 90° right", expresses the rotation you added on this screen as a value within one full turn.

How the tool finds sideways pages from the text

Every piece of text in a PDF comes with a transformation matrix that gives its position and tilt on the page. The tool reads the text pieces and their matrices page by page with PDF.js, groups each piece's tilt into the nearest of 0°, 90°, 180° and 270°, and counts the characters in each group. If one direction holds at least 60% of the characters, that becomes the page's text direction, and matching it against the page's rotation value tells whether the text stands upright. Text tilted more than 12° is not counted.

This works only on PDFs that have a text layer. A picture-only scan that has not been through optical character recognition (OCR) has no text pieces and stays marked "no text", and so does a cover page with fewer than 12 characters. An OCR'd scan follows the direction of the recognized text, so if the recognition is wrong, the judgment can be wrong too. Pages with mixed directions, such as tables with many vertical headers or drawings, are left as "mixed" and not changed. Japanese vertical writing has each character standing upright, so it counts as an upright page. In every case, look over the page sheet once before you save.

Ways to select several pages

In the page numbers box, 5-7 includes pages 5 and 7, and 10- means page 10 through the last page. Selecting only decides which pages get turned; the saved PDF still contains the unselected pages too, in their original order.

How it saves: the original stays and only the orientation is appended

The PDF standard defines incremental saving, where changed parts are added to the end of the file instead of rewriting the whole file (ISO 32000-1, 7.5.6). This tool uses it: it writes the page information of the turned pages again with the new rotation value, adds that after the original, and appends a table that tells viewers where to find it. Not one byte of the original changes, so text, images, fonts, bookmarks, links, comments, form fields and document information all stay as they were, and photos are not recompressed or text turned into pictures.

• File size: all that grows is the page information of the turned pages and the location table, usually about 1 KB. The sample PDF is 209 KB; straightening the 3 sideways pages adds 616 bytes, and straightening 4 pages (page 6 included) adds 766 bytes, giving 210 KB.
• Comments and form fields: annotations and form fields on a page turn with the page. A note icon marked "NoRotate", however, stays upright when the page turns, as the standard specifies (ISO 32000-1, 12.5.3).
• Rotating and saving again: if you open the saved file, turn pages and save once more, one more record is appended after the earlier ones. A viewer reads the latest record.
• PDFs with an irregular structure: if the location information at the end of the file does not add up, there is no place to append to, so the whole document is rewritten and the status line tells you so.

PDFs with a digital signature

The PDF standard describes saving a signed document by appending to the end as the safe way that does not break the signature (ISO 32000-1, Table 219, AppendOnly). The tool saves that way, so the content as it was when signed remains and the signature can still be verified. A PDF viewer may nevertheless report that the document changed after signing, and whoever you submit it to may treat that as a problem.

Extra care is needed when the author added a certifying signature (DocMDP). If its permitted changes are "none", any change invalidates the signature, and the other levels allow only form filling, signing and annotations (ISO 32000-1, 12.8.2.2). Page rotation is not among them, so the tool shows a warning when you open a PDF with a certifying signature. For contracts, certificates and other documents where the original matters, first check whether a rotated copy is acceptable, and keep the signed original separately.

In the rare case that the end of a PDF is not structured in a regular way, nothing can be appended and the whole document has to be rewritten, which breaks a signature; for a signed PDF the tool asks once more before saving. A PDF with a usage rights signature (UR3), which turns on extra features such as saving filled-in forms in Adobe Reader, also gets a notice when you open it, because rotating pages is outside what that signature allows and Reader may switch the extra features off after saving (ISO 32000-1, 12.8.2.3).

Common mistakes

• Turning only the view in a viewer: a view rotation does not stay in the file. Send the file you downloaded with [Save PDF] after rotating here.
• Rotating again after saving: a file you already downloaded does not change. Save again with the final orientation and check the latest file by its name and time.
• Standing a landscape table upright: turn pages by the direction in which the text reads, not by the long side of the paper. A table made in landscape belongs on screen in landscape.
• Pressing a rotate button with nothing selected: with no pages selected, the buttons apply to all pages. Look at the "All pages" or "n selected pages" label beside the buttons first.
• Thinking [Original] means 0°: a page that came with a rotation value goes back to that value.
• Not checking what Straighten did: the text direction is judged from the text layer, so a page that is mostly pictures, or a scan whose OCR is wrong, may come out incorrectly.
• Trying to fix a slightly crooked scan: this tool turns only in steps of 90°. Lines tilted by 1° to 2° have to be corrected in scanning software with a deskew feature.

Limits and cautions

• One PDF at a time, up to 100 MB and 1,000 pages.
• It only rotates in steps of 90°. It does not deskew, run OCR, crop margins, reorder pages or remove pages. To remove or split pages, use a Split PDF tool.
• Password-protected PDFs are not opened. If you know the open password and have the right to edit, remove it first with a PDF unlock tool. Rotating a page counts as "document assembly" among PDF permissions (ISO 32000-1, Table 22), so if the author has blocked editing, respect that.
• Some PDFs cannot be drawn as a preview. The text direction is not read for them, but you can still select pages by number or shape, then rotate and save.
• On a document with many pages, reading the text direction takes a while, and you can rotate and save in the meantime. The tool was tested in Chrome, and the speed in other browsers was not measured.

Reference date The standards, library sources and sample figures were checked on 2026-10-21.

Sources

• 01ISO 32000-1:2008 Document management — Portable document format (Adobe's public copy)Table 30 page dictionary Rotate (clockwise, multiple of 90, default 0), 7.5.6 incremental updates, 12.5.3 NoRotate, Table 219 SigFlags and AppendOnly, 12.8.2.2 DocMDP, 12.8.2.3 UR, Table 22 user permission bit 11 (page rotation)
• 02pdf-lib API — PDFPage.setRotation, getRotationFunctions that read and write a page's rotation as a multiple of 90. This tool uses version 1.17.1 to read the PDF and write the page information (MIT license)
• 03pdf.js 3.11.174 — src/display/api.jsTextItem.transform (a text piece's transformation matrix), PDFPageProxy.rotate (the clockwise angle the page is turned), getTextContent. Thumbnails and the enlarged view are drawn with the same engine (Apache-2.0 license)
• 04Adobe Acrobat Help — Adjust PDF viewsA view rotation made with View > Rotate view can't be saved; to save the rotation with the document, rotate the pages under Organize Pages
• 05Adobe Acrobat Help — Rotate pages in PDFsA view changed with View > Rotate view returns to the original orientation the next time the PDF is opened

Frequently asked questions

Tools to use with this one