免费在线将 PDF 转换为灰度

Scans every page (including scanned/image-only pages with no selectable text) so you can search for a word or phrase.

Starting up…

Download the scanned PDF with a hidden, searchable text layer added — text can then be found and copied in any PDF viewer, not just here.

Extracts the real text where the PDF has it, and runs OCR automatically on scanned/image-only pages. Works best for simple, single-column documents — complex layouts, tables, and multi-column text won't be preserved exactly.

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Done — your Word document is ready.

Each page becomes one slide, rendered as a full-page image — layout, fonts, and graphics come out exactly as they look in the PDF. Runs entirely in your browser.

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Done — your PowerPoint file is ready.

Reconstructs rows and columns from the PDF’s own text spacing, and runs OCR automatically on scanned/image-only pages. Works best for simple, clearly-aligned tables — free-form text near a table may get split oddly.

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Done — your Excel file is ready.

Renders the document’s text, headings, and tables in your browser and slices it into pages. Good for simple documents — page breaks may land in different spots than the original, and complex formatting may shift.

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完成——你的 PDF 已就绪。

Renders each slide with a real presentation engine, matching the original design, images, and layout exactly like exporting from PowerPoint. Your file is uploaded to that server for processing.

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完成——你的 PDF 已就绪。

Reads the actual cell values and draws a real table per sheet — private, works offline. Cell formatting, colors, merged cells, and charts aren’t preserved, and very wide sheets may run off the page.

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完成——你的 PDF 已就绪。

Each page becomes a .jpg image. Runs entirely in your browser — nothing is uploaded. Multiple pages are zipped together for download.

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Done — your JPG is ready.

Each image becomes one page, in the order shown — remove any with the ×, or add more. Runs entirely in your browser.

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完成——你的 PDF 已就绪。

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完成——你的 PDF 已就绪。

Produces one self-contained .html file — an image of each page with an invisible text layer on top, so it looks exactly like the PDF but the text stays selectable, searchable (Ctrl/Cmd+F), and copyable. Runs entirely in your browser.

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Done — your HTML file is ready.

You need to already know the password — this removes protection from a PDF you have legitimate access to, it doesn’t crack unknown passwords. Your file is uploaded to a conversion server to process it (files up to 200MB).

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Done — your unlocked PDF is ready.

Anyone opening this PDF will need the password you set. Your file is uploaded to a conversion server to process it (files up to 200MB).

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Done — your password-protected PDF is ready.

A scanned or photographed signature on a plain background works best — a PNG with a transparent background is ideal.

Some pages look scanned (no selectable text) — run OCR to search them too.

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Content is scaled to fit the new size and centered — nothing is stretched or distorted.

Drag on the page to draw the area you want to keep — everything outside it is cut away. The same box is used on every page.

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Saving…

Your browser doesn't support reading text aloud (the Web Speech API). Try a recent version of Chrome, Edge, or Safari.

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