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 almost everyone needs to send a paper document as a PDF. You no longer need a scanner for that: your phone's camera does the job just as well. The real question is what to use. We compare four options: the Notes app built into iOS, Adobe Scan, CamScanner and our own app Clip PDF.

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

How scanner apps actually work

Technically, all four candidates do the same thing: the camera photographs the page, edge detection finds the borders, the perspective is straightened and a filter boosts the contrast. The biggest difference lies in text recognition (OCR), which turns the photo into searchable text. Some apps compute this directly on the device, others send the document to a cloud server. Cloud OCR is often more accurate on difficult originals, but it means your document leaves the device – something that can matter for contracts or medical records.

The four candidates at a glance

Feature status: July 2026 – details may change with updates at any time.

iOS Notes: the built-in scanner

Many people don't know their iPhone ships with a fully usable document scanner: open the Notes app, tap the camera icon and choose "Scan Documents". Edge detection works reliably, multi-page scans are supported, and the share sheet exports the result as a PDF. Free, no ads, no account, nothing to install.

The limits: the exported PDF usually contains no embedded text layer, so it isn't searchable. There are few settings, no batch management and no compression options. Still: if you only occasionally scan a single document and own an iPhone, you don't need another app. On Android, the Google Drive app 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 can be removed with a tap, and the cloud-based text recognition delivers very good results even with weak lighting or crumpled pages – for free.

In return you accept two things: an Adobe account is mandatory, and processing runs through Adobe's cloud – your scans are uploaded. Text recognition in the free tier is also limited to a certain number of pages per document, and exporting to Word or Excel sits behind the Acrobat subscription. If you regularly digitize whole folders and need searchable PDFs with the highest possible recognition rate, Adobe Scan is the strongest pick – provided cloud processing is acceptable to you.

CamScanner: lots of features, lots of subscription pressure

CamScanner is one of the oldest scanner apps and offers the largest feature set in this field: batch scanning, a dedicated ID card mode, annotations, cloud sync, team features. If you pay for the premium tier, you get a very complete tool.

The free version, however, is a grind: ads, watermarks on exports and frequent subscription prompts. It's also worth mentioning that in 2019 security researchers found a malicious advertising module in the Android version; the app was temporarily pulled from the Play Store and the module later removed. CamScanner makes sense mainly if you genuinely need its special features like the ID card mode and are willing to pay for them.

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. All documents are processed locally on the device – 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 the accuracy of Adobe's cloud OCR on difficult originals – handwriting, poor light, unusual layouts. There is no sync between multiple devices, and no ID card mode like CamScanner's either. 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 here.
• You regularly digitize whole folders and need reliably searchable PDFs: go with Adobe Scan – its free text recognition is the strongest in this field, 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 already exist as PDFs, you don't need an app at all: our web tools such as text recognition, compress and merge run right in the browser, and the files are processed locally on your machine.

Five tips for better scans

• Light from above: daylight or a ceiling lamp instead of the flash – 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 is above the page, 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: a much smaller file is usually enough for email attachments – for example with our compression tool.

Frequently asked questions

Is a scanned PDF automatically searchable?

No. A scan is initially just a photo. Only text recognition places an invisible text layer over the image so you can search and copy words. For existing PDFs you can do this afterwards – for example with OCR in the browser.

Do I need a scanner app at all?

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

Are cloud scanners suitable for confidential documents?

Reputable providers like Adobe transfer documents encrypted and document how they process data. Even so, the document leaves your device. For particularly sensitive papers – contracts, payslips, medical records – a solution with 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 no more than 300 dpi – that's plenty for sharp text. If the file is still too big, compressing it in the app or in the browser helps.