How to use
Use “Take photo” on a phone, or choose / drop photos (multiple pages; you can add more later).
Drag the four corners of the frame onto the corners of the paper (they start from the automatic estimate). A magnifier appears while dragging; arrow keys nudge a focused corner.
Open “Result” to check the look, then pick colour, grey, black and white or original — per page or for all pages at once.
Choose the paper size (match the photo, A4 or Letter), margin and quality, then click “Create PDF”. You can also export JPEGs as a ZIP.
What it does
Finds the corners, lets you correct them
The sheet outline is estimated from a downscaled copy and used as the starting frame. If none is found, the whole photo is the start. Corners can be dragged with a magnifier or moved with the keyboard.
Straight-on view (homography)
The four corners define a perspective transform to a rectangle. The aspect ratio is estimated with perspective taken into account and snapped to A4 (same as A5, B5) or Letter when within 8% (switchable back to “As estimated”; receipts and other non-standard shapes are left alone).
Black and white that survives shadows
Paper brightness is estimated locally and used as the reference, so text stays black even when one side of the photo is dark. Black-and-white pages are stored as 1-bit images: crisp text and small files.
Large photos without crashing
Editing uses a downscaled copy; on export each full-size photo is read and processed one at a time inside a Web Worker, so the page stays responsive.
Use cases
- Photograph a receipt or contract and submit it as a PDF
- Turn a skewed photo of a document into a straight A4 PDF
- Make a shadowed textbook or notes page readable in black and white
- Combine a multi-page document into one PDF for email or an application form
Supported formats
Input
Output
Capability matrix
| Feature | Support | Notes |
|---|---|---|
| Many pages into one PDF (up to 60) | Supported | — |
| Capture with the camera | Supported | Opens the camera on phones; on a computer it is the normal file picker |
| Perspective correction (four corners, homography) | Supported | — |
| Automatic corner detection | Partial | Works when the paper and background differ clearly in brightness. White paper on a white desk is not found; the whole photo is used and you set the corners by hand |
| Colour / grey / black and white / original, shadow removal, auto brightness | Supported | — |
| Paper size (match photo, A4, Letter), margin and quality | Supported | — |
| Reorder, delete and rotate pages | Supported | — |
| HEIC photos (iPhone HEIC format) | Not supported | Not supported. Shoot with Camera → Formats → Most Compatible, or convert to JPEG first |
| Text recognition (OCR) / searchable PDF | Not supported | Pages are images in the PDF. Use the Image OCR tool to extract text |
| Flattening curved book pages, removing glare | Not supported | — |
Limits & notes
- Up to 60 MB and 120 megapixels per photo, 60 pages in total. Larger photos and more pages take more time and memory on export.
- Output is never enlarged beyond the photo’s resolution. Quality presets: High 300 dpi (long side up to 3,508 px), Standard 200 dpi (2,480 px), Small 150 dpi (1,754 px).
- Automatic corner detection is not perfect. Always check the result and move the corners if they are off.
- The size shown before exporting is only an estimate; the real size depends on the page content.
Privacy & safety
Reading, correcting and building the PDF all happen on your device; photos are never sent to a server.
FAQ
The corners are not found automatically
My iPhone photo will not open
Text looks faint in black and white
How do I make the PDF smaller?
Are my photos uploaded?
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