The best document scanner for iPhone depends on where the PDF needs to go. Start with Apple Notes for its existing workflow, consider PrimeDocu if you want scanning alongside signing and document organization, or evaluate Adobe Scan if you use Acrobat. Test a sample page before trusting any scanner with a long document.
Publisher disclosure: this guide is published by PrimeDocu. It explains workflow choices and is not an independent benchmark or a measured scan-quality ranking.
Choose by the job you need to finish
- Capture a readable copy: prioritize crop controls, legible small print and a usable PDF export.
- Search the document later: check whether the exported PDF includes OCR text. An image-only PDF is still a valid PDF, but its text may not be searchable.
- Complete a document: check whether signing and ordinary text entry are included or require a separate editor.
- Store sensitive records: review encryption, backup settings, account recovery and sharing behavior. A scan saved outside the app has separate protections.
- Stay within a free plan: check current page limits, OCR limits, watermarks and storage before committing to a workflow.
PrimeDocu: scanning with a document workflow
The PrimeDocu scanner fits a workflow where you also want to organize files, sign PDFs or request AI analysis. The published free plan includes 1 GB of storage and 10 one-time AI credits. See current plan details; AI credits are not a monthly free allowance.
For a PDF that is already scanned and only needs a signature, the separate browser signer requires no account. It adds signatures rather than filling ordinary form text.
Apple Notes: start with the scanner already on your iPhone
In a note, use the attachment control to scan a document, adjust its corners and add more pages before finishing. Open the scan and use Markup to add a signature. For current controls, see Apple's scanning instructions. Check whether the note syncs to iCloud. Where available and enabled, Advanced Data Protection extends end-to-end encryption to Notes and other supported categories; see Apple's setup requirements.
Adobe Scan: consider the complete scanning and editing workflow
If you use Adobe tools, check the scanner's current export and OCR options alongside the editor you will use afterwards. Do not assume that every PDF task requires a paid subscription or that every feature is included for free. For filling text and adding signatures on a phone, see Adobe's Acrobat mobile instructions.
Microsoft Lens is retired
Microsoft ended Lens support in February 2026 and new scanning after March 9, 2026. It is no longer a current scanner recommendation. See Microsoft's retirement notice before following older Lens tutorials.
Run a quick quality check
- Scan one page in even light, keeping all four corners visible.
- Zoom in on small print, numbers and any stamps. Retake blurry pages rather than increasing contrast until details disappear.
- Add a second page and verify the order in the exported PDF.
- Try searching for a visible word if searchable text matters to you.
- Reopen the exported file in another reader and check its size against the recipient's upload limit.
For an identity document, follow the front-and-back ID scanning guide. For longer paperwork, see how to scan a document with your phone.
Frequently asked questions
Which scanner should I try first?
Start with an app that fits your existing storage workflow, then test PDF readability and export. Choose additional tools only when you need their signing, organization or OCR features.
Is Microsoft Lens still a current option?
No. Microsoft retired Lens in 2026 and ended new scanning after March 9, 2026.
Does a PDF automatically contain searchable text?
No. A PDF may contain only page images. Searchable text requires OCR or an existing text layer; test the exported file.