Scanner Apps Compared: iOS Notes, Adobe Scan, CamScanner & Clip PDF

A signed contract, an invoice for your tax return, a certificate for your insurer – sooner or later everyone has to send paper as a PDF. A scanner isn't needed anymore – your phone's camera does the job; the real question is which app. We compare four options: the Notes app built into iOS, Adobe Scan, CamScanner and our own app Clip PDF.

Full disclosure: this blog is run by LKS E-Commerce GmbH, the maker of Clip PDF. We've still tried to compare fairly – including the cases where another app is simply the better choice. And those cases exist.

How scanner apps actually work

Technically, all four do the same thing: the camera photographs the page, edge detection finds the borders, perspective is straightened, a filter boosts contrast. The biggest difference is text recognition (OCR), which turns the photo into searchable text. Some apps run it on the device, others use a cloud server. Cloud OCR is often more accurate on difficult originals, but your document leaves the device – which matters for contracts or medical records.

The four candidates at a glance

As of July 2026 – details may change.

iOS Notes: the built-in scanner

Many people don't know their iPhone includes a full document scanner: open Notes, tap the camera icon, choose "Scan Documents". Edge detection is reliable, multi-page scans work, and the share sheet exports a PDF. Free, no ads, no account, nothing to install.

The limits: the exported PDF usually has no embedded text layer, so it isn't searchable. There are few settings, no batch management, no compression options. Still: if you only scan the occasional document and own an iPhone, you don't need another app. On Android, Google Drive plays a similar role.

Adobe Scan: very strong free text recognition

Adobe Scan focuses on one thing and does it really well: turning paper into searchable PDFs. Auto-capture triggers at the right moment, stains and shadows disappear with a tap, and the cloud OCR delivers very good results even in weak light or on crumpled pages – for free.

In return, an Adobe account is mandatory and processing runs through Adobe's cloud – your scans are uploaded. Free-tier text recognition is also capped per document, and Word or Excel export sits behind the Acrobat subscription. If you regularly digitize whole folders and need searchable PDFs with a high recognition rate, Adobe Scan is a solid pick – if cloud processing is acceptable.

CamScanner: lots of features, lots of subscription pressure

CamScanner is one of the oldest scanner apps and packs the broadest feature set here: batch scanning, a dedicated ID card mode, annotations, cloud sync, team features. Pay for premium and you get a complete tool.

The free version, however, is a grind: ads, watermarks on exports and frequent subscription prompts. Worth knowing: in 2019 security researchers found a malicious ad module in the Android version; the app was temporarily pulled from the Play Store until the module was removed. CamScanner makes sense mainly if you genuinely need features like the ID card mode and are willing to pay.

Clip PDF: scanning plus processing, locally on the device

Clip PDF is less a pure scanner app than a PDF toolbox: scanning, editing, merging, compressing and password protection all live in one app. Documents are processed locally – nothing gets uploaded, everything works offline. The base version is free and ad-supported; a subscription removes the ads.

To be honest: text recognition runs on the device and doesn't always match Adobe's cloud OCR on difficult originals – handwriting, poor light, unusual layouts. There is no sync between devices, and no ID card mode like CamScanner's. Clip PDF fits if you want to process scans right away and your documents should never leave the device.

Features at a glance

Which app for whom?

• You only scan a document now and then and own an iPhone: stick with the Notes app – an extra app adds little.
• You regularly digitize whole folders and need reliably searchable PDFs: go with Adobe Scan – nothing here matches its free text recognition, if you can live with cloud processing.
• You need special features like the ID card mode or cloud sync for a team and are willing to pay: CamScanner Premium.
• You want to merge, compress or protect scans right away and care that documents stay on the device: Clip PDF.

If your documents are already PDFs, you don't need an app at all: our web tools for text recognition, compressing and merging run in the browser and process files locally on your machine.

Five tips for better scans

• Light from above: daylight or a ceiling lamp – the flash creates glare.
• Contrast with the surface: white paper on a dark table helps edge detection.
• Shoot straight down: the more level the camera, the less the perspective correction has to fix.
• Black-and-white filter for text documents: smaller file, better readability, better OCR results.
• Shrink before sending: email attachments rarely need full size – use our compression tool.

Frequently asked questions

Is a scanned PDF automatically searchable?

No. A scan starts out as just a photo; text recognition adds an invisible text layer so you can search and copy words. For existing PDFs you can do this afterwards with OCR in the browser.

Do I need a scanner app at all?

For occasional scans: no. iPhones have a scanner built into Notes; on Android it's part of Google Drive. A dedicated app pays off once you scan regularly or process the results further.

Are cloud scanners suitable for confidential documents?

Reputable providers like Adobe encrypt documents in transit. Even so, the document leaves your device. For particularly sensitive papers – contracts, payslips, medical records – local processing or the built-in system scanner is the more cautious choice.

How do I get a scan small enough to email?

Scan text documents in black and white at 300 dpi – plenty for sharp text. If the file is still too big, compress it in the app or browser.