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On-device vs cloud redaction
Short answer: On-device redaction cleans the file before it leaves your phone. Cloud redaction usually uploads the original file first, then cleans it somewhere else. If the file is private, cleaning locally first is the safer default.
| What matters | Cloud redaction | On-device redaction |
|---|---|---|
| Original file exposure | Uploaded before cleanup | Cleaned before sharing |
| Internet required | Usually yes | No for core cleanup |
| Account | Often needed | Not needed for cleanup |
| Best for | Low-risk files or team workflows | Personal files, IDs, statements, photos, and AI prep |
When cloud may be fine
A cloud tool may be fine for public files, team workflows, or files that do not contain private details. The risk changes when the original file contains things you would not want copied, logged, reviewed, or leaked.
When on-device is better
Use on-device cleanup for bank statements, payslips, leases, IDs, medical letters, school forms, client documents, screenshots, and photos taken at private places.
The practical difference
Cloud redaction moves the trust decision earlier. You must trust the service with the unredacted original before cleanup has happened. On-device redaction moves the trust decision later. You clean the sensitive parts first, inspect the result, and then choose whether the clean copy should be shared, emailed, uploaded, or sent to an AI tool.
Questions to ask any redaction tool
- Where is the original processed: on the phone, in the browser, or on a remote server?
- Does the tool remove the underlying text or pixels, or only cover them visually?
- Does it remove hidden data such as PDF metadata, comments, attachments, or photo GPS?
- Can the core cleanup flow work without an account?
- Can you save a new clean copy while keeping the original untouched?
For AI uploads
The same rule applies to AI tools: clean first, then upload only if the AI still needs the file. Most AI tasks need the meaning of a document, not the real account number, home address, signature, location metadata, or hidden author field. Removing those details before upload lowers the amount of personal data that enters the AI workflow.
Simple decision rule
If you would not email the original file to a stranger, do not upload that original to a redaction website or AI tool as the first step. Clean it locally, inspect the clean copy, and then decide whether sharing is still necessary.