Flatten PDF
π Private by design: your PDF is processed entirely in your browser. Files never upload anywhere.
β οΈ Warning: flattening converts every page to an image. Text becomes unselectable and unsearchable, and the file may grow larger. This cannot be undone, so keep a copy of your original.
How to Use the Flatten PDF Tool
Choose your PDF, pick JPEG or PNG output, and click Flatten PDF. The tool renders every page at double resolution in your browser, then rebuilds the document from those page images. A download link appears when it finishes. Because rendering happens locally, even confidential documents stay on your device from start to finish.
Use the JPEG option for everyday documents: it keeps file sizes reasonable while staying sharp at 2x rendering scale. The quality slider lets you trade size against fidelity. Switch to PNG only for pages with fine line art or detailed diagrams where any compression artifact would matter. Large documents take longer because each page must be rendered individually, so be patient with hundred page files.
When Should You Flatten a PDF?
Flatten before you share anything that must not change. Filled in forms are the classic case: flattening locks every field, checkbox and signature so the recipient sees exactly what you approved. The same applies to reviewed contracts with comments, architectural drawings with markup layers, and print ready artwork where a stray editable object could shift during production.
Flattening also solves compatibility headaches. Some viewers render form fields or transparency differently, so a flattened file looks identical everywhere because it is just images. Government filings, court submissions and academic theses often require flattened PDFs for exactly this reason. Just remember the tradeoff: once flattened, text cannot be selected or searched, so archive the original alongside the flattened copy.
Quality and Privacy Details
Each page is rendered at 2x scale, which is 144 dots per inch, before being embedded. That resolution keeps printed text crisp and on screen reading comfortable, while avoiding the enormous files that 300 DPI rendering would create. JPEG output uses your chosen quality setting, and PNG output is fully lossless. Page sizes are preserved exactly, so the flattened document has the same dimensions as the original.
Privacy is built in. Rendering and rebuilding happen entirely in your browser with JavaScript, so your document is never uploaded to a server or visible to anyone else. The original file is never modified: the tool always creates a new PDF, leaving your editable source untouched. For sensitive finalized documents like signed agreements and tax forms, this local only approach is the safest way to flatten.
Frequently Asked Questions
What does flattening a PDF mean?
Flattening converts each page of a PDF into a static image and rebuilds the document from those images. Interactive elements such as form fields, checkboxes, comments, annotations and layered graphics are baked permanently into the page picture. After flattening, nothing can be edited, moved or deleted, which is exactly what you want before sharing a finalized document.
Will the text still be selectable after flattening?
No, and this is the main tradeoff to understand. Because every page becomes an image, text can no longer be selected, copied or searched. Screen readers also lose access to the text layer. Only flatten a document when you are sure the content is final and you value permanence over selectability, for example when sending a signed contract or a print ready file.
Why did my flattened file get bigger?
A flattened PDF stores every page as a full page image, while the original may have stored text as compact vector data. Images simply take more bytes than text, especially at high resolution. Choosing JPEG instead of PNG keeps the size much smaller, and the quality slider lets you balance sharpness against file size. For text heavy documents, expect the output to be several times larger than the original.
Should I choose JPEG or PNG output?
Choose JPEG for documents that are mostly text, scans or photos: it compresses photographic content efficiently and keeps files small. Choose PNG only when your pages contain crisp line art, diagrams or screenshots where JPEG artifacts would be visible, since PNG is lossless. Note that PNG output can be dramatically larger, sometimes ten times the JPEG size for the same pages.
Is my PDF uploaded to a server?
No. Your file never leaves your device. Each page is rendered and rebuilt entirely inside your web browser using JavaScript, so nothing is uploaded, stored or seen by anyone else. This makes the tool safe for sensitive finalized documents such as signed agreements, tax forms and official certificates.
Does flattening protect against all edits?
Flattening stops casual editing: form fields can no longer be changed and annotations cannot be moved. However, it does not add encryption or password protection, and a determined person could still edit the page images in an image editor. If you need real access control, combine flattening with password protection from a dedicated PDF security tool.