Combine phone photos into one PDF, right in the browser

Problem

The teacher wants homework "as one PDF"; accounting wants receipts "in a single file." The reflex is downloading a scanner app — which demands a signup, shows ads, watermarks the export, or caps the free tier at three pages. The browser already does this job, without uploading your documents anywhere.

Who should use this

Students and parents submitting photographed homework, employees compiling receipts for expense reports, and anyone digitizing paper documents for archiving.

Formula and concept

Shoot well and the conversion is just packaging. Three shooting rules: light source behind or beside you (never let the phone's shadow fall on the page), lens parallel to the paper (shoot from directly above — keystone distortion from angled shots cannot be fixed later), and let the page fill about 80% of the frame, leaving crop margin. Daylight by a window beats any ceiling lamp.

The orientation trap: phones store rotation in EXIF metadata, and some tools ignore it, exporting sideways pages. Check every photo is upright in the preview before converting; fix stragglers with a rotate tool first — rotating pages inside the PDF afterwards is not saved by every viewer.

Two export decisions: choose A4 paper (the printing and submission standard in most of the world outside North America), which centers each photo proportionally; and manage size — ten full-resolution photos can produce a 30 MB PDF while submission portals often cap at 10 MB. Resize photos to about 2000 px on the long edge before converting, or compress the finished PDF.

Step by step

1. Shoot: natural light, directly overhead, page filling ~80% of the frame; check each shot immediately for glare covering text.
2. Curate: delete retakes, crop each keeper to just the page, and rotate any sideways shots upright.
3. Open the images-to-PDF tool in the phone browser and select all photos at once.
4. Arrange the page order in the preview (usually follows selection order) and choose A4.
5. Export and inspect: page order, orientation, every page readable — then check the file size against the portal limit.
6. Over the limit? Resize the photos to 2000 px long edge and re-convert, or run the PDF through the compressor.

Worked example

A middle-schooler submits 8 pages of math homework: shoots by a window, deletes 2 shadowed retakes, crops each photo to the page. The browser tool combines 8 photos, order confirmed, A4 output — 12 MB, over the school portal's 10 MB cap. Resizing to 2000 px long edge and reconverting yields 4.8 MB. Uploaded. No app installed, no photo uploaded to any third party.

Common mistakes

• Shooting at an angle, turning pages into skewed trapezoids that no crop can rescue.
• Shooting at night under a ceiling light, with shadow and glare covering half the page.
• Skipping the orientation check and submitting a PDF with two sideways pages.
• Converting full-resolution originals into a 30 MB PDF the portal rejects, then redoing everything.

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