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LOCAL SCREENSHOT REDACTION

Screenshot Redaction Proof Studio

Redact screenshot regions with irreversible solid fills, manual region review, source-metadata-stripped PNG re-encoding, decoded-output zone verification, before-and-after SHA-256 hashes and a share-safety proof pack.

Reviewed 2026-07-09

Image
Opaque solid-fill redaction by defaultSource metadata stripped by canvas re-encodingRedacted-zone pixel uniformity verificationOriginal/output SHA-256 and export receipt

WHAT THIS TOOL DOES

Screenshot Redaction Proof Studio: inputs, outputs and verification

Use it whenYou need to remove selected sensitive pixels from a screenshot before sharing and keep proof of the re-encoded output.
You getA newly rasterized PNG with opaque solid-fill redactions, verified zone coverage, original/output SHA-256 fingerprints, zone manifest, SVG map, CSV
Verify withJSON proof receipt, CSV, visual artifact, Markdown generated from visible local input

Loading Screenshot Redaction Proof Studio...

OUTPUT CONTRACT

Finish with artifacts another person can inspect.

A newly rasterized PNG with opaque solid-fill redactions, verified zone coverage, original/output SHA-256 fingerprints, zone manifest, SVG map, CSV audit, Markdown safety note and JSON receipt.

The receipt proves which browser run produced the downloadable artifacts and whether their bytes match the listed SHA-256 digests. It does not prove an external deployment, account state or legal outcome.

PUBLIC METHOD · REPRODUCIBLE INPUTS

Sources, fixtures, artifacts and correction

Method: apply user-selected opaque fills, re-rasterize into a new PNG, decode the output again, verify every selected zone for pixel uniformity, and hash source plus artifact bytes. Manual selection is an explicit limit: the tool cannot know whether you missed sensitive content.

Official sources: WHATWG Canvas, the W3C PNG specification, and Web Cryptography API.

Reproducible fixtures: synthetic source, accepted zones, and rejected zone.

Inspect at least two artifacts: redacted PNG and zone-map SVG; the audit CSV, zone JSON, share-safety Markdown and Receipt v1 make the decision reviewable.

QA and accountability: run flagship-editorial-20260713, reviewed 2026-07-13. Exact report hashes are in the quality manifest. FastTool is the accountable publisher. Report a coordinate, source, fixture or hash error to [email protected].

COMPLETE THE EVIDENCE LOOP

Check the pixel-verification method, then keep the receipt beside the exact re-encoded PNG bytes.

Run the verified fixtureSee the controlled pass, failure and boundary evidence. Follow the rollout guideTurn the browser result into a reviewable real-world workflow. Verify receipt + artifact bytesRecompute the receipt core and compare every supplied artifact locally.