Or drop a file anywhere in this box. It is read here and never leaves your browser.
Drop a photo, PDF, document, video or song here to see what it says about itself.
Drop a photo, a PDF, a Word, Excel or PowerPoint file, an OpenDocument file, a video or an MP3 and read what it says about itself: the camera and its settings, the date it was taken or written, the GPS position, the author, the program that made it. The file is read in this tab by code that runs in your browser, nothing is uploaded, and nothing about it is kept once you close the page. Use it on the file you are about to send, to see what the other person will be able to read.
Most online text tools send whatever you paste to a server, run the work there, and send a result back. Your words sit in someone else's logs, backups and databases, and you have to trust a privacy policy.
Local-first means the opposite: the whole tool is downloaded to your browser and runs on your own device. Nothing you type is transmitted anywhere: not to us, not to anyone. There is no server that could receive it, which is a stronger guarantee than a promise not to look.
Three consequences worth knowing:
You do not have to take that on trust. Open your browser's developer tools, watch the network panel, and type: nothing appears in it.The network's verify page walks through the same check on every Jamuny tool.
A phone photo that carries its position
photo-gps.jpg (a 4 KB JPEG)
Make: Jamuny Test Model: Ünïcødé 写真 ExposureTime: 1/250 s FNumber: f/2.8 ISO: 200 DateTimeOriginal: 2026-10-31 12:34:56 Latitude: 51.5007° N Longitude: 0.1246° W
A camera or phone writes an EXIF block into the JPEG, HEIC, AVIF, TIFF and WebP photos it saves: make and model, exposure time, aperture, ISO, the clock time of the shutter and, when location is switched on, the GPS position. PNG files carry the same data less often, in a text chunk or an XMP packet. The viewer reads all of these and files them under Camera, Exposure, Date and time and GPS. XMP is the XML block that editing programs add, IPTC holds the captions and credits that news and stock agencies use, and ICC is the colour profile.
An EXIF date is written without a time zone, so 12:34:56 means the clock on the camera at that moment and not a point in UTC. The page shows it as written. If the camera clock was never set, the date can be years off, which is a fact about the camera and not a fault in the reader.
A PDF keeps a small Info dictionary: title, author, subject, keywords, the program that wrote the document, the program that turned it into a PDF, and two dates. Word, Excel and PowerPoint files, and their OpenDocument counterparts, are zip archives that hold the same idea in a couple of small XML files. The core properties give title, author, last modified by and the two dates. The app properties give the application name, the company, the word count and the editing time.
Author and Last modified by are usually copied from the account name on the computer, which is how a file called final.docx can name the colleague who drafted it. An encrypted PDF is reported as encrypted, and the page shows what it can read without the password. The title and author of such a file are not among those, and the page says so instead of showing blanks.
MP4, MOV, M4A and 3GP files describe themselves in an index box called moov: duration, creation date, each track with its codec and size, and tag boxes where phones record the make, the model and a GPS position. The page reads that index and skips the picture and sound data, so a large video is not loaded into memory. MP3 files carry ID3 tags at the start: title, artist, album, year, comments and often the name of the encoder.
Any other type, such as WebM, WAV, an archive or a program, gets the File group and a line saying no embedded metadata is read for that type. Photos are read whole up to 256 MB, and a larger photo shows the File group with a note that it is too large to read here. PDFs, Office files, video and audio are read in slices, only the parts that hold the properties.
The useful check is the one before you send: drop the exact file you are about to attach, read the GPS, Document and XMP groups, and compare them with what you meant to share. Exporting a PDF again, re-saving a photo, or using a share option that leaves out location changes the file, and dropping the new copy here shows what is left.
The page stops waiting for a reader after five seconds and says so; it cannot stop a reader that is in the middle of a calculation. A damaged file shows what was read, followed by a line that starts with Could not read the rest and gives the reason. Control and direction characters inside a value appear as \u escapes, so a file name cannot reverse the text around it. In the JSON copy, a key that repeats inside one group, such as two Comment tags, becomes Comment (2), so no value is overwritten.
Often it does. Phone cameras write the GPS position into the EXIF block of a JPEG or HEIC photo unless location tagging is switched off in the camera settings, and the GPS group here shows it as decimal latitude and longitude. Some sites remove the position when they re-encode an upload and others keep it, so the only sure way to know is to look at the exact file you are about to send.
The Info dictionary holds Title, Author, Subject, Keywords, Creator (the program that wrote the document) and Producer (the program that made the PDF), plus a creation and a modification date. A second copy usually sits in an XMP packet, which can also name the editing software. Word processors fill Author from the account name on the computer, so a PDF exported from one often carries a real person's name.
The file is opened with the browser's File API and read by JavaScript in this tab. The page makes no request that carries the file or anything taken from it, and it stores nothing about the file. The one outbound thing is the OpenStreetMap link under a GPS position, a plain link that does nothing until you click it. After you drop a file, your browser's network panel shows nothing except this site's own script files.
No, it only reads and copies. Removing metadata means writing a new file, and that has to be done by a program that knows the format. Export or re-save the file with an option to leave out location and personal details, then drop the new copy here to confirm those fields are gone.