Decode data URIs in QR codes
About this app
TagDrop turns small files — text, HTML pages, images, audio, SVGs — into self-contained QR codes that work completely offline. Print one on a sticker or sheet of paper and leave it somewhere; anyone with the TagDrop app (or any QR scanner that follows tagdrop: links) can scan it and view the content immediately, with no internet connection, server, or account required.
Think of it as a digital geocache: instead of a logbook in a box, the "cache" is the QR code itself.
What you can do with it
• Drop a single page — encode text, an HTML page, an SVG image, or JSON into one QR code, either in-app (Create Cache) or with the web generator.
• Drop a whole "paper" — a printable sheet with a directory QR code (a paper manifest) plus one QR per file, built in-app (Create Paper) or with the web generator. Pages can link to each other with ordinary relative links, so a small static site survives being printed and scanned back in.
• Spread large content across multiple codes — split a payload too big for one QR into multiple sector codes placed along a trail. The app collects sectors in any order, reassembles and verifies them, and can recover a single missing sector from an optional parity code.
• Build trails, collections, and replies — link papers together with location hints, tag a loose set of stickers with a shared collection so they group into one card on the home screen and map, or mark a code as a reply to another to thread a conversation across drops.
• Browse offline — scanned pages render in an in-app viewer, with search and #hashtag filtering, and a hex/CBOR inspector for the curious. The Collections, History, and Map tabs let you revisit, locate, and manage everything you've found, and a single file can back up or restore it all.
• Tap instead of scan — write any TagDrop code to a blank or rewritable NFC tag, then read it back with a tap instead of the camera.
How it works
Every code carries a tagdrop: URI — a CBOR sequence (version, type, and payload map), Base41-encoded so it packs efficiently into a QR code's alphanumeric mode. Content can optionally be DEFLATE-compressed. IDs are content-addressed (SHA-256 based), so identical content always gets the same ID regardless of who created it.
Status
V2.4 — CBOR-sequence envelope encoding with content split into sectors plus optional parity recovery, paper manifests with multi-file directories and relative-link navigation, geographic trails via "related" hints, ad-hoc collections, reply threading, an in-app scanner with a live scan board, NFC tag read/write, search and #hashtag filtering, full backup/restore, a Map tab for located finds, and remote drop-source feeds that pre-populate the map with community drops before you scan them.
Licensed under GPL-3.0-only, by mofosyne.
What's New in v2.4.0
Imported from the F-Droid repository index.
- - Remote drop sources: add any URL that serves a TagDrop drops.json feed and its entries appear as map pins (📡 working, 📵 reported broken) so you can find drops before scanning them.
- - Source management: enable or disable each source independently; disabled sources are greyed out on the list and their pins are removed from the map instantly.
- - Refresh a source to pull the latest entries, or refresh all enabled sources at once from the menu.
- - Source discovery: tap "Browse recommended sources" to
Version history
Jul 4, 2026 · 6.5 MB · Android API 23–35 · code 9
Imported from the F-Droid repository index.
- - Remote drop sources: add any URL that serves a TagDrop drops.json feed and its entries appear as map pins (📡 working, 📵 reported broken) so you can find drops before scanning them.
- - Source management: enable or disable each source independently; disabled sources are greyed out on the list and their pins are removed from the map instantly.
- - Refresh a source to pull the latest entries, or refresh all enabled sources at once from the menu.
- - Source discovery: tap "Browse recommended sources" to
SHA-256 c21201a19de99861de82457734248e2ad8b1af4ae6d3c9956558f7b4a8d1d001
Jul 3, 2026 · 6.4 MB · Android API 23–35 · code 8
Imported from the F-Droid repository index.
- - Paper manifests can now include "Raw QR" files — content placed directly in the QR symbol with no TagDrop encoding, useful for small images or text snippets. Metadata (file name, type, pixel art flag) is declared in the manifest so the app recognises and caches them when you scan each code.
- - Files already cached from a previous scan are now surfaced immediately when you open a Paper manifest, without re-scanning their codes.
- - Wire format: files[] and related[] sub-map keys now use independen
SHA-256 b74edcee8544a603b96559612c9891d3959921bd9ddca54f9753feb4ff9d83ba
Jun 30, 2026 · 6.4 MB · Android API 23–35 · code 7
Imported from the F-Droid repository index.
- - Papers can now claim a short, human-readable domain name (e.g. "helloworld"), so finders can open tagdrop://helloworld instead of typing out a long root hash.
- - Fix: a paper's self-claimed domain name could be crafted to look exactly like another paper's root hash, letting a found code redirect a tagdrop:/// link meant for that other paper. Root-hash links now use an explicit tagdrop://@/ marker so a domain claim can never be confused with one.
- - Cached image files now
SHA-256 a55b3b2144c405251ac8650708535945c831d366e1ba3ed0b725ca364c2d9d93
Will it run on your device?
78%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be com.github.mofosyne.tagdrop is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 2.3.0 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall tagdrop first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of tagdrop, and a listing is removed when the evidence for it stops holding up.
Get tagdrop
Every source we list for com.github.mofosyne.tagdrop is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
c21201a19de99861de82457734248e2ad8b1af4ae6d3c9956558f7b4a8d1d001
Signing certificate
f92099033c52b7b8266928947fc0da8d0a88fd59f68e72f07f9107df316f4456
Permissions Required
What each permission lets tagdrop do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
Previous Versions
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