离线 · 无上传 · 浏览器本地完成Offline · no uploads · runs in the browser
PNG 转换：全部可用目标PNG conversions: every available target
PNG 是像素，不是文字。要让图片进入文档世界，这份工具提供的是「把原始字节或重新编码的像素嵌进去」，不是 OCR。PNG 自身带透明度：转 JPEG 时铺白底，转 WebP 时保留 alpha，写进 PDF 时连同透明通道一起嵌入。A PNG is pixels, not text. Where the tool moves an image into the document world it embeds the original bytes or the re-encoded pixels, never OCR. PNG carries transparency: JPEG flattens it onto white, WebP keeps the alpha, and the PDF embeds the PNG together with that channel.
全部可用目标Every available target
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MarkdownMarkdown 2 步2 steps
PNGPNG HTMLHTML MarkdownMarkdown
一行自包含的图片语法，负载是整份 .png 的字节：不重编码，透明与像素原样。显示与否由阅读器决定，全程离线。One inline image tag whose payload is the whole .png: no re-encode, alpha and pixels untouched. Whether it renders is the reader’s call.
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HTMLHTML 1 步1 step
PNGPNG HTMLHTML
把 .png 包成单图 HTML：原始字节以 data URI 内嵌，不重编码，透明与像素原样保留，文件可离线打开。Wrap a .png in a one-image HTML page with its original bytes as a data URI: no re-encode, transparency intact, and it opens anywhere.
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Word (.docx)Word (.docx) 2 步2 steps
PNGPNG HTMLHTML Word (.docx)Word (.docx)
图片作为包内媒体部件进 .docx，画它不需要任何一次取数；不重编码，透明与像素原样保留。全程离线，文件不出本机。The picture travels as a media part inside the .docx, so nothing has to be fetched to draw it. No re-encode: alpha and pixels stay as they were.
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PDFPDF 1 步1 step
PNGPNG PDFPDF
浏览器本地把 PNG 装进 PDF：常规路径不重画像素，页面尺寸由图像像素换算，横竖自动。一批最多 200 张，默认各自一个 PDF，也可勾选合并成一份多页 PDF。Put PNGs into PDFs locally: pixels are embedded, not redrawn, and each page takes its image’s size and orientation. One PDF each, or one merged multi-page PDF.
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JPEGJPEG 1 步1 step
PNGPNG JPEGJPEG
浏览器本地把 PNG 编成 JPEG：透明区域铺纯白展平，质量档 40%–90%、目标体积 20 KB–2 MB，先降质量再缩像素。最多 200 张一批。Encode PNG to JPEG in your browser: alpha flattens onto pure white, with a 40%–90% quality step and a 20 KB–2 MB target that spends quality before pixels.
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WebPWebP 1 步1 step
PNGPNG WebPWebP
浏览器里把 PNG 编成 WebP，透明通道保留，质量档与目标体积先走质量阶梯再缩像素。最多 200 张一批，结果可打 ZIP。Encode PNG to WebP in the browser with alpha preserved. The target-size lever walks the quality ladder before it throws pixels away; 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：图片里就算有清晰的文字，也不会变成可编辑或可搜索的文本No OCR: even sharp text inside the picture does not become editable or searchable text
- 图片源格式到 TXT、CSV、JSON、Excel 的组合被 conversion-policy 置灰，界面会显示「图片没有文字层」Image sources to TXT, CSV, JSON and Excel are greyed out by conversion-policy, with the interface saying “an image has no text layer”
- 超大图片按画布上限缩放，输出像素可能小于原图；上限在 image-utils 的 MAX_DIMVery large images scale to the canvas limit, so the output can carry fewer pixels than the source; the bound lives in image-utils as MAX_DIM
- 转 JPEG 时透明区域铺白，这是有损画布路径的一部分；转 WebP 与 PDF 时 alpha 随像素保留JPEG flattens transparent areas onto white as part of its lossy canvas path; WebP and PDF keep the alpha with the pixels
常见问题Questions people actually ask
PNG 里的文字能提取出来吗？Can text inside a PNG be extracted?
不能。扩展不包含 OCR，图片对它是像素。需要文字时请先用 OCR 工具生成文本或带文字层的 PDF，再回到这里转换。No. The extension bundles no OCR and treats a picture as pixels. Run an OCR tool first to produce text or a text-layer PDF, then come back to convert that.
PNG 转 JPEG 会损失什么？What is lost converting PNG to JPEG?
透明度变成白底，像素经过有损压缩，线条与文字边缘可能出现振铃。需要无损或需要 alpha 时请转 WebP，或保留 PNG。Transparency becomes white, pixels go through lossy compression, and edges around lines and text can ring. Use WebP when losslessness or alpha matters, or keep the PNG.
PNG 转 PDF 是什么样的一页？What does a PNG to PDF page look like?
页面尺寸取图片自身的宽高比与像素（按 96 DPI 换算成点），不套 A4；PNG 的透明通道随原字节一起嵌入，PDF 里是整张图，没有文字层。The page takes the image’s own aspect ratio and pixels, converted at 96 DPI rather than forced onto A4; the PNG’s alpha channel travels with its bytes. The PDF holds the picture as a whole and no text layer.
转 HTML 会把图片重新压缩吗？Does PNG to HTML recompress the image?
不会。原始字节以 base64 data URI 嵌进 `<img>`，像素与源文件一致；HTML 体积约为图片的 4/3。No. The original bytes are embedded in `<img>` as a base64 data URI, so the pixels match the source; the HTML grows to roughly 4/3 of the image size.
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