XFA (XML Forms Architecture) is a dynamic form format used by Adobe LiveCycle Designer, common in some government and enterprise portals. Browser-based tools including this one cannot reliably flatten XFA forms. If detected, open the file in Adobe Acrobat Reader, use Print → Save as PDF to convert it to a standard PDF, then flatten that result here.

Is flattening a PDF the same as password protection?

No. Flattening bakes content into the page but does not encrypt the file. Mode A output can still be edited with a PDF editor. For real protection, use password encryption or document rights management after flattening if needed.

Does this tool upload my PDF?

No. All processing runs 100% in your browser using pdf-lib and PDF.js. Your files never leave your device and the tool works offline once loaded.

📄 PDF Tools · 100% Offline

Flatten PDF Online Free — No Upload

Q: What does flattening a PDF mean?

It usually means one of two things: (1) permanently baking filled form field values and annotations into the page content so they can no longer be edited, while keeping the page as real, selectable text — or (2) converting every page into a flat image, so nothing at all is editable or selectable, only visible. This tool offers both, explained plainly, since most tools silently pick one and confuse the other half of users.

Q: Why are my form fields still editable after flattening?

You may have used a 'make read-only' option rather than 'flatten values' — read-only fields can still be unlocked by anyone with a PDF editor. For a permanent result, choose the flatten option, which removes the field objects entirely and bakes their values into the page.

Q: Why is my flattened PDF blank?

This is the most common flattening bug: if a form field doesn't have a generated 'appearance stream' (the saved visual representation of its value), some tools flatten it as blank instead of rendering the value. This tool explicitly regenerates appearances for every field before flattening to prevent this.

Q: Why did the file size increase?

This happens specifically with Mode B (flatten to images) — a page of real vector text might be a few KB, but a rendered image of that same page, especially at higher DPI, can be hundreds of KB or more. Mode A (flatten fields only) barely changes file size since it keeps real text.

Q: Does flattening prevent editing?

Not completely. Mode A output can still be edited by anyone with a PDF editor that can add new content. Mode B makes editing much harder since there's no text or object structure to modify, but the underlying text can still be recovered with OCR. For genuine protection, use password encryption or rights management instead.

Q: Can I flatten a signed PDF?

You can, but flattening changes the document's content, which invalidates any existing digital signature — the signature will show as broken or modified afterward. Only flatten a signed document if that's acceptable for your use case.

"Flatten PDF" means two different things, and most tools silently pick one and leave the other half of users confused. This tool explains both plainly and lets you choose the right one — with a verification report so you know it actually worked.

Read before using: Flattening is not security. Mode A output can still be edited by anyone with a PDF editor. Mode B makes editing much harder but not impossible — text can still be recovered with OCR. For genuine protection, use password encryption or document rights management. Flattening also invalidates existing digital signatures, and Mode B removes the text layer entirely, breaking search and screen-reader accessibility.

Which one do I need?

🅰️ Flatten form fields & annotations

Use this if: you filled a form and want the answers locked in; the recipient says fields are blank or editable; you added comments/highlights you want permanent; you signed digitally and want it fixed.

Text stays selectable & searchable
File size barely changes
Accessibility stays intact

🅱️ Flatten to images

Use this if: you need the file completely uneditable; text is being extracted and you don't want that; fonts render wrong elsewhere; a printer/portal keeps rejecting the file; you have a watermark you don't want removed.

Nothing is selectable or editable
File size increases significantly
Breaks screen-reader accessibility

Property	Mode A (fields)	Mode B (images)
Text searchable/selectable	✓ Yes	✗ No
File size	Barely changes	Increases significantly
Accessibility (screen readers)	✓ Intact	✗ Broken
How locked-down it is	Editable with a PDF editor	Much harder to edit
Quality at low DPI	Always vector-perfect	Can look blurry

Upload PDF(s)

Drag & drop, browse, or paste. Multiple files get the same settings, downloaded individually or as a ZIP.

Drag & drop PDF files here

or click to browse, or paste.

Free Online PDF Flattener — Lock Form Fields or Rasterize Pages

Flattening a PDF permanently bakes content into the page so it can't be changed later. But which content, and how it's baked in, matters enormously. ToolAdda explains both approaches in plain language: Mode A locks filled form fields and annotations while keeping real, selectable text; Mode B converts every page into a flat image where nothing is editable or searchable. Choose the one that matches your actual need — not what a random tool silently picked for you.

Mode A vs Mode B — which do you need?

🅰️ Flatten form fieldsLock filled answers, comments, highlights, and stamps into the page. Text stays selectable, searchable, and accessible. File size barely changes.

🅱️ Flatten to imagesRasterize every page at 72–600 DPI. Nothing is selectable or editable. File size grows significantly — use when you need maximum lock-down.

🅲 Smart hybridFlatten forms on pages that had fields; rasterize only where needed. Best of both when your document is mixed.

✅ Verification reportAfter flattening, confirms fields removed, text extractability, page count, and dimensions match — so you know it worked.

⚠️ Blank-field fixRegenerates field appearances before flattening — the #1 cause of "my flattened PDF is blank" in other tools.

📦 Batch + ZIPApply the same settings to multiple PDFs. Download individually or as a single ZIP archive.

How to flatten a PDF without uploading

Read the mode comparison above and click Mode A, Mode B, or Smart hybrid.
Drag & drop your PDF(s). Review the analysis report for form fields, XFA warnings, and digital signatures.
Configure flatten options — which annotations to include, DPI for image mode, optional cleanup (metadata, JavaScript, attachments).
Click Flatten & Download. Check the verification report, then save your flattened PDF.

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Frequently asked questions

What does flattening a PDF mean?

It usually means one of two things: permanently baking filled form values and annotations into selectable page text, or converting every page into a flat image where nothing is selectable. This tool offers both, explained plainly.

Why are my form fields still editable after flattening?

You may have used "make read-only" rather than "flatten values" — read-only fields can be unlocked by anyone with a PDF editor. Choose the flatten option for a permanent result.

Why is my flattened PDF blank?

The most common bug: a field without a generated appearance stream can flatten as blank. This tool explicitly regenerates appearances for every field before flattening.

Why did the file size increase?

Only with Mode B — a vector text page might be a few KB, but a rendered image of it, especially at higher DPI, can be hundreds of KB. Mode A barely changes size.

Does flattening prevent editing?

Not completely. Mode A can still be edited with a PDF editor. Mode B is much harder to edit but text can still be recovered with OCR. Use password encryption for real protection.

Can I flatten a signed PDF?

Yes, but it invalidates the existing digital signature since the content changes. Only do this if that's acceptable.

What is an XFA form?

A dynamic form format (Adobe LiveCycle) used by some government portals. Browser tools can't flatten it reliably — open it in Adobe Acrobat Reader, Print → Save as PDF, then flatten that result here.

Does this upload my PDF?

No. All processing runs 100% in your browser. Your files never leave your device and the tool works offline once cached.

Is flattening the same as password protection?

No. Flattening bakes content in but doesn't encrypt the file. For genuine protection, add password encryption or rights management after flattening if needed.