Most photos worth posting contain something not worth publishing: a stranger’s face, a child in the background, a license plate, a screen with an email open. Redacting these before sharing is a two-minute job, but the method matters more than people think, because not all obscuring is equally hard to undo. This guide covers what to hide, which technique to use for what, and the metadata step almost everyone forgets, with free in-browser tools starting at the face blur tool. Nothing uploads anywhere, which for privacy work is the entire point.
In this guide
What actually needs hiding
The usual suspects, roughly in order of how often they slip through:
- Bystanders’ faces, especially children’s: people who never agreed to be in your post.
- License plates, which tie a photo to a person and, combined with the photo’s context, to their routines.
- Screens and documents in the background: monitors, letters on the table, whiteboards, name badges. The background of a casual office photo has ended more than one confidentiality streak.
- Location identifiers: street signs and door numbers when the photo is taken somewhere private, like your home.
The habit that catches all of them is one deliberate sweep of the frame’s edges and background before posting, because the subject of the photo is never the leak; the leak is what you stopped seeing.
Blur, pixelate, block: the honesty ranking
Here is the part most guides skip. Obscuring methods differ in how recoverable they are, and research on deblurring and depixelation has shown that light blur and coarse pixelation over text can sometimes be partially reversed, because both leave structured information behind. The practical ranking:
- Solid block (censoring): the only method that removes information instead of smearing it. For text, plates, IDs, and anything truly sensitive, an opaque rectangle is the professional choice, and it is what our censor tool draws.
- Strong blur or pixelation: fine for faces in casual contexts, where the goal is decency rather than defeating a determined adversary. The keyword is strong: a heavy setting that leaves no recognizable structure, not a gentle cosmetic mist.
- Light blur: a stylistic effect, not a privacy measure. If you can almost read it, software may fully read it.
One more rule belongs in this section: flatten, never layer. Redaction must replace the pixels, which is what these tools do by re-encoding the image. Posting an editable file where a black box sits on a separate layer above intact pixels is the classic redaction failure of the document world; exported flat images do not have this problem.
The right tool per job
- Blur face: region-targeted strong blur for faces.
- Blur license plate: the plate-shaped version of the same job; pair it with the walkthrough in our plate and face guide.
- Censor image: solid blocks for text, screens, and documents, the irreversible option.
- Blur image and blur WebP: whole-image or regional blur when the subject itself is the sensitive part.
All of them run client-side: the unredacted original never leaves your machine, which matters precisely because the original is the sensitive object.
The invisible leak: metadata
Blurring the pixels does nothing to the photo’s metadata, and a photo taken at home can carry GPS coordinates of your house in its EXIF block regardless of what the pixels show. Before sensitive photos travel, check what they carry with the EXIF viewer and strip it with the EXIF remover, with the full inventory of what photos carry in the EXIF guide; the wider metadata story, including the document side, is in the metadata guide. Note that major social platforms strip EXIF on upload, but messengers, email, and cloud links often pass the original through untouched, so the safe habit is stripping before sending rather than memorizing which channel does what.
The before-posting checklist
- Sweep the frame: faces, plates, screens, documents, location identifiers, edges and background especially.
- Redact by sensitivity: solid blocks for text and anything identifying, strong blur for casual face privacy.
- Strip metadata, always for photos taken at home or around children.
- Re-open the exported file and zoom in: confirm the redaction survived export and nothing readable remains.
- Keep the original private, since the redacted copy is the only one that should travel.
Frequently asked questions
Is blurring faces legally required?
It depends on jurisdiction and context, and this guide is not legal advice. The practical norm is simpler: people who did not consent to publication, children above all, deserve the two seconds of blur regardless of what the law minimally requires.
Can someone really un-blur a photo?
For strong blur over a face, realistically no for casual purposes. For light blur or coarse pixelation over text, reconstruction attacks exist and improve, which is why text-shaped secrets get solid blocks, not blurs.
Does screenshotting the redacted image make it safer?
A screenshot of a flattened redaction adds nothing but quality loss; the redaction was already irreversible. Where screenshots genuinely help is documents with layered or selectable content, which is a different failure mode than images.
Why not just crop the sensitive part out?
Cropping is excellent redaction when the composition survives it, and it removes the information entirely. Blur and block exist for the cases where the sensitive element sits in the middle of a photo you still want to share.