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# LabelPi – User guide
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## 1. Basics
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**Top bar:** printer (only shown if several are connected) · roll · length (continuous rolls only) · *rotated* · copies · dithering · auto-cut (models with a cutter only) · cut mark · **Print**.
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- **The roll selected here must match the roll that is loaded.** LabelPi asks if you change the roll compared with the last print.
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- **rotated:** On continuous rolls the length is shown horizontally and the label is rotated by 90° when printing, so you read it like on screen.
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- **Dithering:** Only useful for photos/greys. Keep it **off** for text, QR codes and barcodes.
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- **Cut mark** (continuous rolls without a cutter): prints a dashed line at the end of the label so you cut in the right place by hand (e.g. QL-500).
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**Working in the designer**
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- **View:** By default only the most important functions are shown. **Advanced view** (bar at the top right) adds rotate, dithering, auto-cut, cut mark, series, grid and zoom. More elements (PDF, shapes, symbols) are in the **＋ More …** menu, saving/export under **File ▾**.
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- Add elements from the toolbar, **tap** = select, **drag** = move, **bottom-right corner** = resize.
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- The **properties** are in the bar at the bottom, which always stays visible. It also has buttons to align the element to the label.
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- Elements **snap** to the edge, centre and other elements while moving (pink guide lines).
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- **↶ / ↷** undo and redo (last 25 steps).
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## 2. Elements
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| Element | Notes |
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|---|---|
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| **Text** | Multi-line. *Auto size* fills the box with the largest possible font (set the box height). |
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| **Symbol** | Warning, hazard, recycling signs etc. – they are text in a symbol font, so freely scalable. |
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| **QR code** | Any text or link; placeholders allowed. The *QR assistant* builds Wi-Fi, vCard, email … for you. |
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| **Barcode** | Choose a type (see below). With invalid content a red warning appears and **nothing is printed**. |
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| **Image** | Photo/logo from your device. Switch dithering on for photos. |
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| **PDF** | The page size selects the matching roll. Multi-page PDFs can be printed as a series (one page per label). |
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| **Shapes** | Circle, line, arrow, triangle – filled or outline, rotatable in 45° steps (properties → Rotation). |
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| **Table** | See section 3. |
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**Barcode types**
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| Type | Input |
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|---|---|
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| Code 128 | Any characters |
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| EAN-13 | 12 digits (check digit is added) |
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| EAN-8 | 7 digits |
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| Code 39 | Capital letters, digits, `- . $ / + %` and space |
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| GS1-128 | With brackets, e.g. `(01)09501101530003(17)271231(10)AB12` |
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| Data Matrix | Any text, square |
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## 3. Tables
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- **Tap a cell** = select it (blue). **Double-click or double-tap** = type directly into the cell. *Enter* accepts, *Tab* jumps to the next cell, *Esc* cancels.
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- In the properties: add/remove rows and columns, font, line width, *first row bold*.
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- **Table border:** all lines · outside only · row lines · none.
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- **Border of a single cell:** select the cell and tick *top / bottom / left / right*. This is in addition to the table border – with “none (cell borders only)” just the marked cells get lines (e.g. a single underline).
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- Texts that are too long shrink automatically to fit the cell.
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- You can also edit the content as text: one line per table row, columns separated by `;`.
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## 4. Placeholders
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Placeholders work in **text, QR codes, barcodes and table cells**. The names are German; English short forms exist.
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| Placeholder | Meaning | Example |
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|---|---|---|
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| `{n}` | Counter within the series | 1, 2, 3 … |
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| `{n:5}` | Counter, 5 digits with leading zeros | 00001 |
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| `{gesamt}` / `{total}` | Number of labels in the series | `{n}/{gesamt}` → 3/10 |
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| `{lfd}`, `{lfd:5}` | **Running counter that remembers** (stored on the Pi, survives restarts and device changes) | 1001, 1002 … |
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| `{lfd.invoice}` | Named counter, as many as you like | independent of `{lfd}` |
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| `{datum}` / `{date}` | Today's date | 24.10.2026 |
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| `{datum:JJJJ-MM-TT}` | Date with a custom format (`JJJJ`/`YYYY`, `JJ`/`YY`, `MM`, `TT`/`DD`) | 2026-10-24 |
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| `{datum+30}` | Date plus 30 days (also `-7`; units `d` days, `w` weeks, `m` months, `j`/`y` years) | 23.11.2026 · `{datum+6m:MM/JJJJ}` → 04/2027 |
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| `{zeit}`, `{zeit:HH:MM:SS}` | Time | 14:35 |
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| `{jahr}` `{monat}` `{tag}` | Single date parts (also with offset, e.g. `{jahr+1j}`) | 2026 · 10 · 24 |
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| `{kw}` / `{cw}` | ISO calendar week (e.g. `{kw+2w}` = week in two weeks) | 43 |
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| `{wochentag}` `{monatname}` | Name in the interface language | Saturday |
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| `{zufall:8}` / `{random:8}` | Random code (8 characters, without easily confused ones like 0/O and 1/I); every label of a series gets a different one | K7HT3QWZ |
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| `{uuid}` | Random UUID | 3f2a9c1e-… |
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| `{ColumnName}` | Value from the CSV column (CSV series only) | `{Name}` |
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**English short forms:** `{date}` `{time}` `{year}` `{month}` `{day}` `{weekday}` `{cw}` `{random}` `{total}` `{seq}`.
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**Filters** (append with `|`, combinable): `{Name|gross}` UPPERCASE · `{Name|klein}` lowercase · `{Name|titel}` Title Case (English: `|upper` `|lower` `|title`) · `{n:8|luhn}` appends a Luhn check digit · `{n:12|gtin}` appends the EAN/GTIN check digit.
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**Notes**
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- Date and time come from the device you print from. Unknown placeholders are left unchanged.
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- `{lfd}` reserves the numbers when printing. If printing fails the counter is reset (no gaps). You see the next value in the preview and under *Settings → Counter*, where you can also change it.
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- Examples: `SN-{jahr}-{lfd:4}` → `SN-2026-0001` · `Best before {datum+30}` · `CW {kw}/{jahr}` · `{n:11|gtin}` as EAN content.
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## 5. Series (“Series…”)
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- **Counter:** set start, step and count. Example: start 100, step 5, count 10 → 100, 105, …, 145.
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- **CSV file:** first row = column names, then one label per row. Separator `;` or `,`, UTF-8.
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```
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Name;Item;Number
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Miller;Screw M4;1001
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Smith;Nut M4;1002
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```
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Use `{Name}`, `{Item}`, `{Number}` in the designer.
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- **PDF pages:** created when you import a multi-page PDF.
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- **Copies** apply per label of the series. Printing happens in blocks; the history only shows the first label of the series.
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- The preview first shows label 1; use **‹ ›** next to “Series…” to page through all labels.
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## 6. Grid (“Grid…”)
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Continuous rolls only. Several labels side by side and below each other on one strip:
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1. Set the *label width* in mm (e.g. 28 mm on a 62 mm roll for two columns).
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2. Set *columns × rows* and *gap*.
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3. When printing, consecutive labels (copies or series) fill the grid. If the grid does not fit the roll an error appears.
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## 7. Templates, history, export, backup
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- **Templates:** save with “Save as template”, sort into **folders**, edit (name/folder) and export.
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- **History:** every print and every “Save” ends up here. *Print again*, *Edit*, or use *Select* to delete/export several.
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- **Export/import:** labels and templates as a JSON file, e.g. to share. **⬇ PNG/PDF** exports the current label as an image or PDF.
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- **Backup:** *Settings → Save database* stores everything (including printers and password), *Restore backup* puts it back.
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## 8. Printers and security
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- **USB printers** are detected automatically. Several identical models are told apart by their USB port.
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- **Network printers** (LAN/Wi-Fi): *Settings → Add network printer* (name, IP, model).
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- **Password protection:** *Settings → Password protection*. Without it anyone on the network can print – use it only in trusted networks.
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## 9. Form mode, QR assistant
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- **Form mode:** every template has an **Form** button. It shows only a small form with one field per custom placeholder (e.g. `{Name}`, `{Room}`), a preview and the number of copies – no designer. Ideal for colleagues who only need to print.
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- **QR assistant:** select the QR code and click *QR assistant…* in the properties. Types: link, Wi-Fi access, contact (vCard), email, phone, SMS, location, free text. You fill in the fields and the content is built correctly. Placeholders are allowed here too.
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## 9a. Keyboard shortcuts
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| Key | Action |
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|---|---|
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| `Del` | Delete the selected element |
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| `Ctrl+Z` | Undo |
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| `Ctrl+Y` or `Ctrl+Shift+Z` | Redo |
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| `Enter` / `Tab` / `Esc` | In a table cell: accept / next cell / cancel |
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## 10. Common problems
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| Problem | Solution |
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|---|---|
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| Label cut off or misplaced | Is the roll in the app the same as the loaded one? Check “rotated”. |
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| Barcode is not printed | Check the input (e.g. EAN-13 needs 12 digits). |
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| Text looks different on paper | Dithering off; font not too small (below about 6 pt). |
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| Page not reachable | Pi and device on the same network? Use the IP instead of `labelpi.local`. |
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| More help | `docs/INSTALL.md` (installation, troubleshooting) |
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## 11. Languages
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The interface is available in German and English. Choose the language in the bar at the top right; it is remembered per device (the browser language is used on first start).
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**Adding a new language**
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1. *Settings → Languages → Download template for a new language* (`neue-sprache.json`).
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2. Open the file: the German text on the left must not be changed, enter your translation on the right. `{}` are placeholders for numbers/names and must stay in the same number and order. Empty entries are shown in German.
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3. Set `"_name"` at the top to the name of the language, e.g. `"Français"`.
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4. Save the file as **languagecode.json**, e.g. `fr.json`.
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5. *Add language file (.json)* – or put the file into the `lang/` folder on the Pi. Custom files survive updates and take precedence over built-in ones.
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**Translating this guide (optional):** put it into the `lang/` folder (or `docs/`) as `ANLEITUNG.fr.md` – it is then shown under *Help* when that language is active. Without a translation the German guide is shown.
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Placeholders such as `{datum}` keep their names; English short forms exist (`{date}` …). Dates, weekdays and month names appear in the selected language. If you would like to share your translation, the project welcomes a pull request.
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