Adobe Scan: Disabling Cloud Sync and Redacting Locally

Adobe Scan OCR Redaction Guide: Disable Cloud Sync and Redact Locally

Adobe Scan uploads every document to Adobe Document Cloud by default using the Adobe Sensei engine for server-side OCR¹. Signing out of your Adobe ID in the app prevents scans from syncing to the cloud, and disabling cellular data for Adobe Scan in your device settings blocks all network access. Without those precautions, every page you scan transmits to Adobe's servers before you can process it locally.

Adobe Scan produces solid perspective correction on mobile photos, handling moderate tilt from handheld capture. Its compression pipeline outputs JPEG files at a moderate quality level even when the source photo is high resolution. Consequently, exported files often contain visible JPEG block artifacts around fine text strokes, which can reduce Tesseract's character recognition accuracy on fonts below 10 points². After blocking network access, local JPEG exports work directly with the OCR Redactor.

Specifications³

Disabling cloud uploads before scanning

Inside Adobe Scan, tap your profile avatar in the upper right, then Settings. Sign out of your Adobe ID and disable cellular data for the app in your device system settings. This prevents the app from transmitting the scan to Adobe servers immediately after capture. Also turn off "Save originals to Camera Roll" if your camera roll syncs to iCloud or Google Photos, as that creates a second upload path through a different cloud service⁴.

Exporting local scans for desktop redaction

After disabling cloud sync, finished scans remain local on the device. Export them by tapping Share and choosing Save Image, which writes the JPEG to your device photo library. You can then transfer the file to your computer and drop it into the OCR Redactor. CapyToolkit processes the file entirely in the browser, so even after transfer, no document data passes through any server during the OCR and redaction workflow.

The local export step is what makes the whole workflow private. CapyToolkit's OCR Redactor processes the JPEG entirely in the browser, so the only movement the document makes is from your phone to your own computer and then into the tool's drop zone. Because nothing is sent to a server, you can keep the original scan on the device until you confirm the redacted export looks correct before deleting the source.

Common issues with scan quality for OCR

Adobe Scan handles moderate tilt well during perspective correction, but the output JPEG quality level is lower than a dedicated ADF scanner. Scans taken under fluorescent lighting with shadows across the page produce uneven contrast that Tesseract struggles to segment correctly. Photograph the document under natural light or direct overhead lighting with no shadows, holding the phone directly above the page. Building on this, Adobe Scan applies automatic color balance that can wash out gray text on colored paper backgrounds. For documents with colored backgrounds, a dedicated scanner with adjustable gamma settings produces more consistent output than a mobile photo app.

Feeding Adobe Scan output into the OCR Redactor

Export the scan from Adobe Scan as a JPEG by tapping Share > Save Image. Transfer the file to your computer via USB, AirDrop, or any local transfer method. Drop the JPEG onto the OCR Redactor drop zone. Tesseract extracts text from the image, and you draw redaction rectangles over sensitive regions. Because Adobe Scan's JPEG compression can soften fine characters, check the OCR result panel for missing words near highly compressed regions². Rescanning the same document with better lighting often recovers the missed characters. Furthermore, for multi-page documents, export each page individually and process them one at a time in the tool.

Improving Adobe Scan output quality for OCR accuracy

Adobe Scan applies automatic perspective correction and brightness normalization during capture, but these processes have limits. Perspective correction handles angles up to approximately 30 degrees reliably; beyond that, character shapes distort enough to reduce OCR accuracy on small fonts. Hold the phone directly above the document surface, parallel to the page, to stay within the correction range. For table-heavy documents with thin grid lines, perspective distortion causes individual cell contents to overlap adjacent cells after correction, which Tesseract's layout analysis then segments incorrectly.

Lighting is the most controllable quality factor for mobile capture. Adobe Scan's automatic tone mapping adjusts for overall exposure, but it cannot eliminate directional shadows that create brightness gradients across the text region. Place the document on a flat surface under overhead lighting, turn off any desk lamp that creates a shadow from one side, and ensure no window light hits the document at an angle. Under even lighting, the brightness gradient disappears and Adobe Scan's binarization step produces a clean black-on-white image that Tesseract processes with high accuracy.

Using Adobe Scan's page boundary controls before exporting

After Adobe Scan captures a page, it displays a crop view showing the detected page boundaries as adjustable handles. The automatic edge detection works well on white or near-white documents against a contrasting background, but struggles when the document color matches the surface it rests on. Manually drag each corner handle to align precisely with the document edge before accepting the capture. A crop that cuts into the text margin removes words that Tesseract would otherwise extract and redact. An overcropped edge is worse than an undercropped one for the redaction workflow: missing text cannot be redacted, while extra background in the image produces only minor OCR noise that does not interfere with the target field redaction.

Transferring Adobe Scan exports securely to a desktop for redaction

Adobe Scan exports to the device photo library when you disable cloud sync, but transferring that photo to a desktop machine for redaction requires choosing a transfer method that does not reintroduce the cloud exposure you disabled in the app. USB cable transfer via Finder on macOS or File Explorer on Windows copies the JPEG directly between devices over a wired connection with no cloud intermediary. AirDrop between Apple devices uses peer-to-peer Wi-Fi or Bluetooth and does not route through Apple servers, making it a suitable local transfer method for sensitive documents.

Avoid sending the scan via email attachment or messaging app if those services route through cloud servers in jurisdictions where your document's sensitivity creates legal concerns. iMessage between Apple devices can use end-to-end encryption, but iCloud photo sync may capture the image before you send it if iCloud is enabled in the Files app. Google Photos auto-backup on Android similarly captures the scan before you can transfer it manually. Confirm that automatic backup is disabled in both the Adobe Scan settings and the device's photo management app before scanning any document that must remain local, then run it through the cloud-free Adobe Scan redaction flow.

Calibrating Adobe Scan for specific document types

Adobe Scan includes a Whiteboard capture mode and a Business Card mode alongside the default Document mode. The Document mode applies perspective correction and contrast enhancement suited for printed paper documents. For documents scanned inside clear plastic sleeves or binders, the plastic surface can create glare spots that appear as bright patches in the captured image, causing Tesseract to miss characters in the affected region. Remove the document from the sleeve before scanning, or photograph at a slight angle to push the glare to the document margin rather than the text region. For two-sided thermal paper receipts, which fade quickly, scan immediately after printing and use the Grayscale filter option under Adobe Scan color settings to preserve tonal variation that the standard Document mode might normalize away.