使用教程 · 四大发票工具上手指南How-to: a guide to all four invoice tools

该用哪个工具？Which tool do I need?

• 排版打印：把多张 PDF/OFD/拍照发票拼成 A4，加签名水印，导出一个 PDF 或直接打印。Layout & print: arrange PDFs/OFD/photos onto A4, add a signature/watermark, export one PDF or print.
• 信息提取：批量识别发票要素，汇总成表并做价税校验，导出 Excel/CSV 台账。Extract: batch-read invoice fields into a validated table and export an Excel/CSV ledger.
• OFD 转 PDF：把数电发票 OFD 按原尺寸 1:1 高清转成 PDF，可批量合并。OFD→PDF: convert OFD invoices to PDF at original size, with batch merge.
• 本地台账：发票记录跨月累积在本机，历史查重防重复报销，按月统计与备份。Ledger: records accumulate locally across months, with duplicate checks, monthly stats and backup.

一、排版打印工具1 · Layout & print tool

① 导入发票① Import invoices

在工具页点击虚线框，或把文件拖进页面任意位置（也支持 Ctrl+V 粘贴截图）。可一次多选：税务局下载的 PDF/OFD 版式发票会被逐页转成图片并尝试识别号码、日期、金额；JPG/PNG 照片可继续裁剪、旋转。Click the dashed box, drop files anywhere, or press Ctrl+V to paste. Select many at once: tax-bureau PDF/OFD invoices are converted page-by-page and number/date/amount are detected; JPG/PNG photos can be cropped and rotated.

② 裁剪拍照发票② Crop photo invoices

对照片点列表里的 ✂️ 裁剪，拖动选框框住发票主体、去掉背景杂物，用「旋转 90°」纠正拍歪的方向，比例预设快速对齐。裁剪只影响排版用的副本，不改动原图。Tap ✂️ Crop on a photo, drag to frame the invoice and drop clutter, use Rotate 90° to fix tilt and ratio presets to align. Cropping only affects the layout copy, never your original.

③ 排版与导出③ Arrange & export

选择纸张（A4/Letter/A5/小票长条）、纵横向、每页 1～6 张、页边距与间距，右侧 A4 预览实时更新；可拖动或用 ↑/↓ 调整顺序。可选「黑白省墨」「页脚加页码」「首页加报销汇总单」「水印/签名」。完成后点「下载 PDF」合并导出，或「直接打印」。Choose paper (A4/Letter/A5/Receipt), orientation, 1–6 per page, margin and gap; the A4 preview updates live and drag/↑↓ reorder. Optionally enable grayscale, page numbers, a summary cover, or a watermark/signature. Then Download PDF to merge, or Print directly.

二、信息提取工具2 · Field extraction tool

• 导入：点「＋ 添加发票」或拖入，支持 PDF/OFD/照片，可多选。Import: click “＋ Add invoices” or drop files — PDF/OFD/photos, multi-select.
• 自动识别：提取发票代码、号码、开票日期、不含税金额、税额、价税合计、税率、购销方。数电票若文字层缺中文标签，会用票面 20 位号码、文件名或发票二维码兜底识别。Auto-read: code, number, date, net, tax, total, rate, buyer and seller. When a digital invoice’s text layer lacks Chinese labels, it falls back to the 20-digit number on the face, the file name, or the invoice QR code.
• 校验与修正：「校验」列检查「价税合计 = 不含税 + 税额」（±0.02 元），✓ 一致、⚠ 需核对；点击任意单元格可手工修正。Check & correct: the check column verifies “total = net + tax” (±0.02); click any cell to correct it.
• 导出与串联：导出 Excel（金额列为真数字，可直接求和）或 CSV，或「复制」；点「并入台账」把记录送入本地台账；「批量重命名」按号码/日期整理文件名。Export & chain: export Excel (numeric cells, ready to sum) or CSV, or Copy; “Add to ledger” pushes records into the local ledger; “Batch rename” tidies file names by number/date.

三、OFD 转 PDF 工具3 · OFD-to-PDF tool

• 导入：点「＋ 添加 OFD」选择一个或多个数电发票 OFD 文件。Import: click “＋ Add OFD” and pick one or more OFD files.
• 输出方式：「合并为一个 PDF」或「逐个导出」为各自文件。Output: merge into one PDF, or export each separately.
• 输出质量：省空间 / 清晰打印 / 最高（1:1）。Quality: Small / Print / Max (1:1).
• 转换：点「开始转换并下载 PDF」，按原尺寸高清还原 OFD 版式（含文字、线条与印章图片），解决单位只收 PDF 的痛点。个别复杂 OFD 无法完整解析时会给出转换指引。Convert: click “Convert & download PDF” to render the OFD at original size (text, lines and seal images) — solving the “we only accept PDF” problem. Complex OFDs show a conversion guide.

四、本地发票台账4 · Local ledger

• 数据来源：在「信息提取」点「并入台账」，记录即保存在本机浏览器（IndexedDB），不上传服务器。Where data comes from: “Add to ledger” in Extract saves records in your browser (IndexedDB), never uploaded.
• 跨月累积与统计：记录跨会话保留，按月统计本月新增、金额合计与开票月份。Accumulate & stats: records persist across sessions; monthly stats show new-this-month, total amount and invoiced month.
• 查重防重复：自动标记重复记录，避免同一发票号重复报销；可按号码/文件名搜索过滤。Duplicate check: duplicates are flagged to prevent double claims; search by number or file name.
• 导出与备份：导出 Excel/CSV；「备份 JSON」保存全部数据、「恢复备份」导入还原。换电脑或清理浏览器前请先备份。Export & backup: export Excel/CSV; “Backup JSON” saves everything and “Restore” imports it back. Back up before switching devices or clearing the browser.