EasyScan2PDF

Turn scanned documents — typically two book pages per landscape sheet — into a clean PDF with one page per sheet.

▶ Open EasyScan2PDF

No downloads, no set up: directly in your browser.

Your documents stay on your device. The app works entirely inside the browser, makes no network requests with your files, and keeps working offline.

Install it as an app

Installing gives EasyScan2PDF its own window and icon, and lets it run without an internet connection.

Device	How
Windows, macOS, Linux — Chrome, Edge, Brave	Open the link above and press Install app at the top right of the app (or the install icon in the address bar).
Android — Chrome	Open the link, then browser menu ⋮ → Add to Home screen → Install.
iPhone, iPad — Safari	Open the link, then Share → Add to Home Screen.
Firefox	Installation is not available; use the app in a tab — it works the same.

Once installed on a computer you can also right-click a PDF and choose Open with → EasyScan2PDF.

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User's manual

1. The screen

#	Part	What it is for
1	Open…	Choose a scanned PDF. You can also drop the file anywhere on the window. JPEG and PNG scans work too: select all the images at once and each becomes one sheet, in file-name order.
2	Version and Update	The version number and release date of the copy you are running. Update downloads the newest version of the app and reloads it — see Is my copy up to date?.
3	Pages per sheet	How each scanned sheet is divided. Auto decides between one page and two pages side by side. Choose 2 (top | bottom) for sheets with one page above the other. Changing this re-runs the detection for the whole document.
4	Reading order	Right to left puts the right-hand page first, for Arabic, Persian, Hebrew or Japanese books.
5	Status	Number of sheets found, number of pages that will be written, and how many sheets need a look.
6	Language and theme	Interface language (English, Español, Français, Deutsch, Português, Italiano, فارسی) and light or dark appearance. Theme: system follows your device. Both choices are remembered.
7	Sheets	Every scanned sheet with its detected areas. Click one to edit it. A dot marks a sheet: orange = check it, grey = has a blank page, blue = adjusted by hand.
8	Sheet toolbar	Tools for the sheet being edited — see section 3.
9	Page areas	One rectangle per output page. What is inside the rectangle is what goes on the page.
10	Output	Format of the PDF to create — see section 4.
11	Preview	The selected page exactly as it will be written.

2. Open a document

Press Open… (1) or drop a file on the window. The app examines every sheet and proposes the page areas by itself:

• it turns upright any sheet that was scanned sideways;
• it finds where the sheet is divided by looking at all sheets together, so one unusual sheet (a title page, a picture across the fold) does not spoil the split;
• it gives all left pages and all right pages the same frame, so the text sits at the same place and the same size on every output page;
• it skips blank pages and measures how much each page is tilted.

For most documents there is nothing more to do: go to section 4.

3. Check and adjust the areas

#	Control	What it does
1	◀ ▶	Previous and next sheet. Page Up and Page Down do the same.
2	1 page / 2 pages	Changes how this sheet is divided — for example a cover scanned alone in a book of double pages.
3	Reset sheet	Discards your changes on this sheet and restores the automatic areas.
4	Apply areas to…	Copies the areas of this sheet to other sheets, when you prefer to set the frame once by hand. All sheets copies everything. This sheet onwards leaves earlier sheets alone, for books whose layout changes partway through. Left pages of all sheets and Right pages of all sheets copy only that side (the top or bottom page on sheets split top | bottom). Pages that were skipped stay skipped.
5	Rotate…	Turns this sheet, or all sheets, by 90° right, 90° left or 180°. Sideways scans are turned automatically when the document is opened; use this when a sheet ended up upside down, or to turn sheets the app left alone. The areas of a turned sheet are detected again.
6	Tilt	Angle of the selected page, in degrees clockwise. It is measured automatically; type a value to correct it. The rectangle turns to match, and the page comes out straight.
7	↶ ↷	Undo and redo, for every change to the areas, rotation and page order. Ctrl+Z and Ctrl+Y.
8	− 100% +	Zoom out, back to the whole sheet, zoom in. Ctrl + mouse wheel zooms towards the pointer. Scroll to move around a zoomed sheet.
9	Notice	Tells you why a sheet is marked: text was found outside the common frame, or a blank page was skipped.
10	Page label	The page number in the output. Untick the box to leave this page out; the label then reads Skipped.
11	Handles	Drag a handle to resize the area. Drag inside the rectangle to move it.
12	Orange area	Something was found outside the frame shared by the other pages (here, a note in the margin). The area was enlarged to include it — shrink it back if it is only a stain.

Click a rectangle to select it: the preview, the Tilt box and the arrow keys then refer to that page.

Keyboard

Keys	Action
← → ↑ ↓	Move the selected area by a small step (0.1% of the sheet).
Shift + arrows	Move it ten times further.
Alt + arrows	Resize the selected area from its right and bottom edges (add Shift for bigger steps).
Page Up / Page Down	Previous / next sheet.
+ / − / 0	Zoom in / zoom out / whole sheet.
Ctrl+Z / Ctrl+Y	Undo / redo.

4. Choose the output and create the PDF

#	Setting	Meaning
1	Presets	One click sets the options below. Compressed: black & white, cleaned up — the smallest file, ideal for plain text. Optimized: greyscale at the resolution of the scan, cleaned up — a good balance, and the starting point. Best quality: colour, high JPEG quality, no clean-up — the most faithful, and the largest. The button stays highlighted while the options match it; you can still change any option afterwards.
2	Page size	A4, A5, A3, B5, Letter, Legal, or Custom… to type a width and height in millimetres.
3	Orientation	Portrait or landscape.
4	Margin	Minimum white border around the text, in millimetres. The dashed line in the preview shows it.
5	Scaling	Fit to page, same scale for all keeps the text the same size on every page (recommended). Fit each page separately enlarges each page as much as possible. Original size keeps the size of the scan.
6	Colour	Black & white gives the smallest files and the crispest text. Greyscale suits pencil notes and photographs. Colour keeps everything.
7	Resolution	Auto writes each page at the resolution the scan really has, so the file holds no invented pixels (black & white pages get twice that, which keeps letter edges smooth at little cost). The value used is shown under the preview. Choose a fixed value only for a special need: above the scan's own resolution it adds size but no detail.
8	Threshold	Black & white only. Leave Automatic threshold ticked, or untick it and move the slider: right makes the text heavier, left makes it lighter. Greyscale and colour show a JPEG quality slider here instead.
9	Straighten tilted pages	Turns each page by its tilt so the lines come out level. Untick to keep pages as scanned.
10	Clean up the scan	Makes the paper pure white, evens out yellowing and the shadow near the binding, darkens the ink and removes isolated specks. Small marks next to text — accents, dots, punctuation — are kept. Untick it for pages with photographs or pale pencil notes you want exactly as scanned.
11	Pages to export	Leave empty for the whole document, or type page numbers and ranges of the output, such as 1-10, 15.
12	Pages per file	Leave empty for a single PDF. Type a number to split the output into several files of that many pages, named name_1.pdf, name_2.pdf, … Chrome, Edge and Brave ask for a folder to put them in; other browsers download them one by one.
13	Organise pages…	Opens the page organiser — see section 5.
14	File name	Name of the PDF to create.
15	Create PDF	Writes the document. Chrome, Edge and Brave ask where to save it; other browsers put it in the Downloads folder. Cancel stops a long export.
16	Preview	Updates as you change the settings. The line under it gives the page number, the scale and the resolution that will be used.

File size

The output is a new picture of every page, so its size depends on the options, not on the size of the original:

• Compressed is usually smaller than the scan.
• Optimized is usually of the same order as the scan. Pages of plain text are stored in 16 shades of grey, which is both smaller and sharper than JPEG; pages with pictures are stored as JPEG.
• Best quality is larger than the scan.

Some scanners produce files that separate text from background and compress each in its own way. Those are hard to beat: expect Optimized to come out somewhat larger than such an original, and use Compressed when size matters most.

Your output settings are remembered for next time.

5. Organise the pages

Organise pages… shows every page of the output in order. Drag a page onto another to move it there, or use the buttons under each page:

#	Control	What it does
1	◀ ▶	Moves the page one place earlier or later.
2	＋	Inserts a blank page after this one — for example to make a chapter start on a right-hand page.
3	✕	Removes the page from the output. A removed scan page becomes Skipped in the editor, where ticking its box brings it back.
4	Blank page	An inserted blank page, labelled Blank.
5	Original order	Puts the pages back in scan order and removes the blank pages.
6	Close	Returns to the editor. Page numbers on the areas follow the new order.

6. On a phone or tablet

The layout adapts to the screen. On a narrow screen the sheets become a strip you swipe sideways, and the output settings and preview follow below the sheet. Handles are larger so the areas can be adjusted with a finger.

Is my copy up to date?

The version number and release date are shown next to the app's name. Compare them with the first lines of src/version.js in this repository, which always hold the latest release.

The app checks for a new version every time it is opened with an internet connection. To fetch it at once, press Update: the app downloads all its files again and reloads. An open document is closed by the reload, so the app asks first.

Tips and limits

• Text cut off on a few pages? Open those sheets and widen their areas, or set one sheet by hand and use Apply areas to… → All sheets.
• A sheet came out upside down? Automatic turning judges which way is up from the shapes of Latin letters, so it can be wrong for other scripts or unusual pages. Use Rotate… → This sheet 180° (or All sheets 180°).
• Wrong split on every sheet? Pick Pages per sheet by hand instead of Auto.
• Faint marks disappeared, or a picture looks washed out? Untick Clean up the scan.
• Password-protected PDFs cannot be opened.
• The output contains images of the pages; it does not add searchable text (no OCR).

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For developers

The app is a static page with no build step.

index.html             the app
src/version.js         version number and release date
manifest.webmanifest   install information
sw.js                  offline cache (app files only)
src/detect.js          page-area and tilt detection (no DOM)
src/clean.js           colour modes and scan clean-up (no DOM)
src/i18n.js            interface languages
src/app.js             UI, preview and PDF export
src/style.css
icons/
vendor/                pdf.js 3.11.174 (Apache-2.0), pdf-lib 1.17.1 (MIT)
docs/img/              manual screenshots
scans/, formatted/     personal documents — git-ignored

Publish: push the repository to GitHub, then Settings → Pages → Deploy from a branch → main / root. For every release, set the number and date in src/version.js: the app shows them, and installed copies use the number to drop their old files.

Add a language: in src/i18n.js, copy the en block under a new language code, translate the values and add the language's name to NAMES. It then appears in the language menu; keys you leave out fall back to English. For a language written right to left, also add its code to RTL: the whole interface then mirrors. The translations other than English and Spanish were written without review by native speakers — corrections are welcome.

Run locally: double-click index.html, or, to test installation and offline use, serve the folder:

python -m http.server 8137 --bind 127.0.0.1

Licence

MIT — see LICENSE. Bundled libraries keep their own licences, in vendor/.