Foxglove rewrites your image on your device before you post it: it drops the source file’s location, serial numbers, hidden thumbnails and edit history (it keeps the capture date and camera model unless you turn that off), writes your name, copyright, terms and a machine-readable “do not train” statement into the new file, and can draw a visible text signature into the picture if you turn it on. All image processing runs on your device, and Foxglove never uploads your images; they leave your device only when you save, share or send them yourself, including screenshots you attach to feedback. On the website, the only things sent anywhere are the email address you type into the sign-up form and what you send with the feedback form (both go to info@cweird.com through FormSubmit), and Vercel Web Analytics counts page views, sign-ups and App Store button taps. The iPhone app hides the sign-up form and has no analytics.

Metadata: tracking out, record in — removes location, serial numbers, hidden thumbnails and edit history by re-encoding the image, then writes your name and handle (if you entered them; otherwise the creator and owner fields say ‘Unknown’), copyright, terms and a machine-readable “do not train” statement into the EXIF and XMP fields. If ‘Keep capture date and camera model’ is on (it is on by default), the capture date and camera make/model the source file already carries are copied into the new file; a file with no such data gets only the export date.

Hidden message — paused: it used Foxglove’s own format, so only Foxglove could read it, and social media uploads might erase it. It’s switched off while a sturdier mark is planned (see “What is the hidden message?” below). Pictures saved earlier with a hidden message can still be checked in the Inspect tab.

Visible signature Testing — turn it on and Foxglove draws a text caption into the image pixels: by default your name and handle if you entered them, the year, and ‘not for AI training’; you can type your own caption instead, and add a logo or signature image. Drag either one into place or pick a spot, and set its size and opacity. The size meter is a rule of thumb: text at least 22 px tall after an assumed downscale to a 768-px short side, at least 60% opacity. Visible by design; you choose how subtle, and where it sits.

A note in the file — your own line, written into the file’s metadata with your name. Read it back in the Inspect tab.

“Do not train” statement — the ‘do not train’ choice is written as the IPTC/PLUS Data Mining property in the file’s XMP metadata, a published standards-body vocabulary. Whether that meets EU copyright law’s machine-readable reservation is a legal question. Choose no AI training at all, or search indexing only. No AI company has published that it reads this field. Any re-save that does not copy metadata drops the record (the app’s own re-encode does; so did placing a signed PNG into a new canvas image, and a macOS sips PNG-to-JPEG conversion). In IPTC’s 2019 test Facebook removed XMP, where this statement is written, so it is most likely to stay on files you host yourself. Foxglove makes no claim about what removing these fields means legally. Not legal advice.

Batch processing — up to 20 images at a time. If you add more, the first ones up to 20 are kept and the app says how many were left out. People have reported large batches on phones stopping before they finish.

No. Foxglove does not try to damage AI models, and nothing in it is computed against one. What it does: writes your name, rights and a “do not train” statement into the file’s metadata and, if you turn it on, draws a visible signature into the picture. The visible signature can be cropped out, and a re-save that does not copy metadata drops the record. The website no longer adds the faint noise pattern; the iPhone app (1.1.1) still adds it by default.

That's expected. Nothing Foxglove writes into a file is meant to change what a chatbot says about the picture. Turn on the visible signature and your name is part of the pixels, so it goes wherever that part of the image goes. The record and the do-not-train statement are a rights record inside the file, with a receipt you keep; no AI company has published that it reads that field.

It’s paused on the website. The hidden message used Foxglove’s own format: only Foxglove could read it, and social media uploads might erase it. It’s switched off while a sturdier mark is planned: TrustMark, an open invisible watermark from Adobe (free and open source) that other programs can read. It isn’t in the app yet. What works now: your copyright, and your name once you add it, in every file you save, the visible signature, and receipts kept on this device. Pictures saved earlier with a hidden message can still be checked in the Inspect tab. The iPhone app (1.1.1) still has its own hidden message.

The record — name, copyright, terms and the “do not train” statement — is metadata inside the file. Whether a conversion to JPEG carries it over depends on the tool you use (the PNG chunks sit after the image data, where some tools such as macOS sips ignore them), so check the converted file in the Inspect tab. The visible signature, when turned on, is part of the picture, so converting the format keeps it; cropping or covering that area removes it. You can also have Foxglove save a JPEG directly (the format switches are in the Metadata card), with the legacy IPTC copyright fields that Facebook kept in IPTC’s last published test (Spring 2019); PNG, JPEG and, in the web version only, WebP can be saved together, each with the record and its own receipt.

Update — November 3, 2026 — A new look at the top, with the mascot (Mascot visits in About turns its visits off). Batches take up to 20 images. Clearer messages when a file can’t open or is too large to save, and less memory per picture. Docs checks PDFs when you pick them and names any claims it leaves out.

1.2.0 (website) — November 2, 2026 — This is the website. The iPhone app on the App Store is still 1.1.1 and doesn’t have these changes.

Testing Visible signature: your name, a caption of your own or a logo drawn into the picture — drag to place, pinch to size. Off by default.

Testing Inspect tab, in place of Verify: shows what a file carries (creator, rights, terms, the do-not-train statement, dates, camera, any location or serial numbers), reads a hidden message from the pixels when a file carries one, and checks a file against your receipt.

Testing JPEG and WebP copies next to the PNG (WebP on the website, in browsers that can make it), each with the record and its own receipt entry.

Testing Do-not-train files for your website: robots.txt, host headers, page tags, tdmrep.json and a policy page to paste in.

Testing Docs tab: makes a PDF from your text, or a copy of your PDF, with made-up claims hidden in it, plus a private answer key, and checks pasted text for those claims.

Every saved file carries your name (or ‘Unknown’), a copyright line, your terms and a “do not train” statement (no AI training, or search indexing only), plus a human-made declaration, and you get a receipt with each file’s fingerprint.

The hidden message is paused: it used Foxglove’s own format, which only Foxglove could read, and social media uploads might erase it. Pictures saved earlier with one can still be checked in the Inspect tab.

The noise switch is gone: Foxglove no longer adds a noise pattern to the pixels. Previews show the whole picture instead of a square crop. A feedback form in About sends ideas, suggestions and bugs, with screenshots. PDFs picked in the main upload box open in the Docs tab. Testing Each picture you save or share now keeps its receipt on this device; the receipts are listed in the Inspect tab, with Download all. The wording describes what the app does; it no longer claims to damage AI models.

1.1.1 (Build 8) — June 10, 2026; the version in the iPhone app. The hidden message is read back before the app reports it embedded: if the textured-only embed doesn’t fit or doesn’t read back, flatter areas are tried, and the results screen says when it couldn’t be embedded. A long message is trimmed to fit the 124 characters, cutting your own text before your artist credit.

1.1 (Build 7) — PNG transparency kept in web downloads; the iPhone save path that keeps it was connected in 1.1.1 (Build 8). This release hid the message only in textured areas and added Max mode; 1.1.1 changed the first, and Max mode is not in this version.

1.0 (Build 6) — Added the missing camera-permission text, without which opening the camera crashed the app. App Store subtitle changed.

1.0 (Build 5) — Block-based hidden-message encoding and the PNG description metadata.

See full changelog →

Content Credentials (C2PA) — Inspect shows when a file already carries a Content Credentials manifest; Foxglove can’t write or re-sign one.

Android — there is no Android app; the work is paused until there is an Android test device.