ShareX vs Snagit vs Snipping Tool vs SnapShield AI: an honest redaction comparison

We make one of the tools in this comparison, so treat our verdicts on the others as informed but interested. What we can do is be specific about criteria, and be honest about where the free options win — because for a lot of people they do.

The question here is narrow: when you cover something sensitive and export, is the data gone from the file? Capture features, uploaders and workflow automation are covered briefly, but they are not what this is about.

The short version

	Snipping Tool	ShareX	Snagit	SnapShield AI
Price	Free, built in	Free, open source	Paid, perpetual	Free tier / paid
Solid redaction	Yes	Yes	Yes	Yes
Automatic detection	Emails, phones (OCR)	No	No	Faces + data patterns
Runs entirely locally	Yes	Yes (uploads optional)	Yes	Yes
Capture breadth	Good	Excellent	Excellent	Basic
Best for	Most people, occasionally	Power users, workflows	Teams making documentation	Redaction-heavy work

Snipping Tool — start here

It is already installed, and on Windows 11 it is genuinely capable. Region, window, full-screen and delayed capture; video; OCR through Text Actions; and a Quick Redact that finds email addresses and phone numbers on its own and blacks them out.

The redaction applies a solid block, not a blur, and saving produces a flattened PNG. For the common case — a couple of email addresses in a screenshot going to a colleague — this is sufficient and free, and we would rather you used it than paid us for something you do not need.

Limits. Quick Redact only knows the patterns it ships with. It will not find API keys, faces, account balances, internal hostnames, licence plates or names. It is a first pass, not a review. And there is no batch mode, so twenty screenshots means twenty rounds of manual work.

Use it if you redact occasionally, mostly contact details, one file at a time.

ShareX — the best free tool, if you will invest in it

ShareX is a remarkable piece of open-source software and the strongest free option on Windows by a wide margin. Region, window, full-screen, scrolling and GIF capture; an annotation editor; hotkeys for everything; and a workflow engine where after-capture and after-upload tasks chain together into genuinely powerful automation.

For redaction it gives you shapes and a highlight tool, and you can draw a filled opaque rectangle over anything. Applied that way and exported to PNG, the result is sound.

Limits. There is no automatic detection of sensitive content — every region is one you spotted yourself. The interface is dense and configuration-heavy; it rewards investment and punishes casual use. And its default workflows are built around uploading, so it is worth going through the destination settings deliberately if the whole point is that nothing leaves the machine. It will happily do exactly that, but you should confirm it rather than assume it.

Use it if you want maximum capability for zero money and do not mind a steep setup.

Snagit — for teams producing documentation

Snagit is a mature commercial product aimed at people who make screenshots for a living: technical writers, trainers, support teams building knowledge bases. Scrolling capture, step-numbering, templates, a library that keeps a history of everything you have captured, and a polished editor.

Its blur and “simplify” tools are the ones people reach for to hide sensitive data. Blur is reversible, so use the solid fill instead — which Snagit provides, it just is not the default reflex.

Limits. It is the most expensive option here, and none of the redaction is automatic — you still find every region yourself. The capture library is a genuine benefit for documentation work and a genuine liability for sensitive work, because it retains unredacted originals by default.

Use it if documentation is your job and the polish and library pay for themselves.

SnapShield AI — ours

Built for the case where redaction is the main event rather than a step: screenshots that routinely contain faces, customer data or credentials, in volume.

What it does that the others do not. Detection runs locally and proposes regions — faces via an on-device model, and sensitive data patterns via the Windows OCR engine. You accept or adjust what it finds. Batch redaction applies to a folder rather than a file at a time. Exported redactions replace the pixels, and that behaviour is covered by pixel-level tests that fail our build if a redacted region still correlates with what was underneath.

We are specific about that last point because we got it wrong. In an earlier build our solid redaction was drawn at 90% opacity and recoverable with a levels adjustment, and our blur applied a plain Gaussian that left text legible. Both were fixed in 1.6.2. We would rather say that plainly than let you find it out.

Where it is the wrong choice. Our capture feature set is basic next to ShareX and Snagit — if you need scrolling capture, GIF recording or an automation pipeline, they beat us and it is not close. There is no macOS or Linux build. And if your redaction need is “an email address, twice a month”, Snipping Tool already does that and costs nothing.

Use it if you redact often, need faces or patterns found for you, or work in batches.

How to test any of these yourself

Do not take our table on faith. The check takes a minute:

1. Screenshot something with small, high-contrast text — a terminal works well.
2. Redact half of it with the tool’s solid fill, and half with its blur or pixelate.
3. Export to PNG and close the editor.
4. Reopen the exported file in a different viewer, zoom to 400%, and push brightness and contrast to the extremes. If your viewer has levels, drag the black and white points together.

The blurred half will usually give up something. The solid half should stay flat. If a tool’s solid fill does not stay flat, stop using it for anything that matters.

Then check where the tool keeps originals — capture histories, auto-save folders and crash-recovery files all mean an unredacted copy exists on disk after your export is clean.

Choosing

• Occasional, contact details, already on Windows 11 → Snipping Tool.
• Free, powerful, willing to configure → ShareX.
• Documentation is the job → Snagit.
• Redaction is the job — faces, patterns, batches → SnapShield AI.

Whatever you land on, the technique matters more than the tool: opaque fill, flatten, verify. A careful person with Paint produces safer files than a careless person with any of these.

Related reading

• Can blurred text be recovered?
• How to redact a screenshot on Windows