离线 · 无上传 · 浏览器本地完成Offline · no uploads · runs in the browser
JPEG 转换：全部可用目标JPEG conversions: every available target
JPEG 在拍摄那一刻就丢掉了透明与一部分高频细节，之后的每条路线只能决定要不要再丢一次。转 PNG 或 WebP 不会恢复细节；写进 PDF 会按图片自身尺寸建页，不套 A4。若需要图里的文字，唯一诚实的答案是先做 OCR。A JPEG already gave up transparency and some high-frequency detail when it was captured; every route from here only decides whether to lose more. Converting to PNG or WebP does not restore detail, and writing to PDF builds a page at the image’s own size rather than A4. If the words inside matter, the honest answer is OCR first.
全部可用目标Every available target
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MarkdownMarkdown 2 步2 steps
JPEGJPEG HTMLHTML MarkdownMarkdown
产物是一行自包含的图片语法：``，字节就是原文件；不识别图里的文字，也不产生描述。全程离线。You get one self-contained image tag whose bytes are the original file. No OCR, so no text is invented and nothing is uploaded.
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HTMLHTML 1 步1 step
JPEGJPEG HTMLHTML
文件以 data URI 内嵌进一份能直接打开的网页，`alt` 与 `title` 用你的文件名主干；不解码也不重编码，像素就是你原来那一份。全程离线。The file is embedded as a data URI with your file name as alt and title; nothing is decoded or re-encoded, so the pixels are the ones you had.
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Word (.docx)Word (.docx) 2 步2 steps
JPEGJPEG HTMLHTML Word (.docx)Word (.docx)
照片作为包内媒体部件进 .docx，画它不需要任何一次取数；像素原样、不重编码，但也不会识别图里的文字。全程离线。The photo rides into a .docx as a media part, so nothing has to be fetched to draw it. Pixels are untouched, but nothing is read out of the picture.
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PDFPDF 1 步1 step
JPEGJPEG PDFPDF
浏览器本地把 .jpg 装进 PDF：页面按像素尺寸换算、横竖自动。这条路解码后再编码一次，PNG 那条则不重编码，两者是有损与无损的对照；默认一张一份，也可勾选合并成一份多页 PDF。Put .jpg files into PDFs locally, sized from their pixels. This route re-encodes once; the PNG route does not. One PDF each, or one merged multi-page PDF.
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PNGPNG 1 步1 step
JPEGJPEG PNGPNG
浏览器本地把 .jpg / .jpeg 解码成像素再编为 PNG：尺寸原样，可选最长边，一批最多 200 张可打成一个 ZIP。EXIF 与 GPS 不会跟着走。Decode .jpg to pixels in your browser and re-encode as PNG: dimensions kept, optional longest edge, 200 images in one ZIP. EXIF and GPS do not travel.
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WebPWebP 1 步1 step
JPEGJPEG WebPWebP
浏览器本地把 .jpg 编成 WebP：质量档 40%–90%、目标体积 20 KB–2 MB，先走质量阶梯再缩像素。最多 200 张一批，结果可打 ZIP。Encode .jpg to WebP in your browser with a 40%–90% quality step and a 20 KB–2 MB target — the quality ladder first, pixels second. 200 images per batch.
界面上置灰的目标Targets the picker greys out
下面这些目标在路径图上可达，但语义上无效，工作台会把它们置灰并给出原因，而不是让你点下去得到一个空文件。These targets are reachable in the graph but semantically invalid, so the workbench greys them out with the same reason instead of letting you click through to an empty file.
- Excel (.xlsx)：图片无法转换为文本或表格数据（需 OCR，暂不支持）Excel (.xlsx): Images cannot become text or tabular data (needs OCR, not supported)
- CSV：图片无法转换为文本或表格数据（需 OCR，暂不支持）CSV: Images cannot become text or tabular data (needs OCR, not supported)
- 纯文本 (TXT)：图片无法转换为文本或表格数据（需 OCR，暂不支持）plain text (TXT): Images cannot become text or tabular data (needs OCR, not supported)
- JSON：图片无法转换为文本或表格数据（需 OCR，暂不支持）JSON: Images cannot become text or tabular data (needs OCR, not supported)
这个来源格式的共同限制What holds for every target from this source
- 没有 OCR，也没有文字层；JPEG 里的文字只是像素No OCR and no text layer; words in a JPEG are pixels
- 图片源格式到 TXT、CSV、JSON、Excel 的组合被 conversion-policy 置灰并说明原因Image sources to TXT, CSV, JSON and Excel are greyed out by conversion-policy, with the reason shown
- 转 PNG 是无损容器装已有像素，不会提高清晰度；源文件的大小编码损失无法撤销PNG is a lossless container for pixels that already exist, not a sharpness upgrade; the source’s encoding loss cannot be undone
- 超大图按 MAX_DIM 缩放，转 PDF 时页面尺寸也随之缩小Very large images scale to MAX_DIM, and the PDF page size shrinks with them
常见问题Questions people actually ask
JPEG 转 PNG 会变清晰吗？Does JPEG to PNG become sharper?
不会。转换只是把已有像素放进无损容器，压缩造成的块效应与模糊已经写在像素里。要提升清晰度需要原始未压缩图像或超分辨率工具。No. The conversion puts existing pixels into a lossless container; the blocking and blur from compression are already in those pixels. A sharper result needs the original uncompressed image or a super-resolution tool.
JPEG 转 WebP 值得吗？Is JPEG to WebP worth it?
通常能减小体积，但这是一次再编码，细节会再损失一点。若原图是高质量 JPEG 且要长期保存，转 PNG 做无损封装更稳；若目标是网页加载，WebP 的体积优势更实际。It usually saves bytes, but it is a re-encode and gives up a little more detail. For a high-quality JPEG kept long term, wrapping the pixels in PNG is safer; for web delivery, WebP’s size advantage is the practical win.
JPEG 转 PDF 是 A4 吗？Is a JPEG to PDF page A4?
不是。页面按图片自身的宽高与像素建（96 DPI 换算成点），横图得到横向页面、竖图得到纵向页面；整张图铺满一页。No. The page is built from the image’s own dimensions and pixels at 96 DPI: a landscape image gets a landscape page and a portrait one a portrait page, with the picture filling it.
能把多张 JPEG 分别转成 PDF 吗？Can several JPEGs each become a PDF?
能。同一批次里每个文件各出一份 PDF，整批共用一个目标格式；需要一次下载就打 ZIP。当前版本不会把多张图合并成一份 PDF。Yes. Each file in the batch produces its own PDF under one shared target, and a ZIP collects them in one download. This version does not merge several images into a single PDF.
不需要账号，也不需要联网：装好扩展后点图标，在新标签页里打开工作台，文件从磁盘直接选。No account and no network: install the extension, click its icon, and the workbench opens in a new tab reading straight off your disk.
从 Chrome 应用商店安装Install from the Chrome Web Store 安装步骤Install steps GitHub 源码Source on GitHub
最后更新 2026-10-21Last updated: 2026-10-21