Grayscale, Flatten, Resize PDF Online Free

Short answer: The PDF tools bundle packs five tools in one page — grayscale, flatten, resize, header/footer and N-up. Everything runs 100% in your browser, with no signup and no watermark.

Five PDF tools in one page — grayscale, flatten, resize, header/footer and N-up. 100% free, in your browser — no signup, no watermark.

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Drop your PDF here or click to browse

Max 50MB · Works on any device

Convert PDF to Grayscale

Turn every page black & white — perfect for printing without colour ink.

✅ Done

Note: grayscale pages are re-rendered as images, so text is no longer selectable in the output. The original layout and quality are otherwise preserved.

Flatten PDF

Merge fillable form fields into the page content so filled values can no longer be edited or cleared.

✅ Done

Note: this flattens AcroForm fields (text boxes, checkboxes, dropdowns). Comment annotations such as sticky notes and highlights are left unchanged.

Resize PDF Pages

Change every page to a new size — A4, Letter, Legal, A5 or your own custom size.

✅ Done

Add Header / Footer

Stamp text on every page — headers, footers, page numbers, dates.

Tokens: {page} = page number, {total} = total pages, {date} = today's date.

✅ Done

N-up Layout

Put multiple pages on one sheet — save paper when printing handouts.

✅ Done

Note: N-up sheets are built from rendered page images, so text is no longer selectable in the output.

Frequently Asked Questions

How do I convert a PDF to grayscale?

Upload your PDF, open the Grayscale tab and click Convert to Grayscale. Every page is re-rendered in black and white — ideal for printing without colour ink.

What does flattening a PDF do?

Flattening merges fillable form fields into the page content, so filled-in values can no longer be edited or accidentally cleared.

Can I resize a PDF to A4 or Letter?

Yes. Pick A4, Letter, Legal, A5 or a custom size. Keep content position to preserve vector text, or scale content to fit to fill the new size exactly.

How do I add page numbers to every page?

Use the Header/Footer tab and type "Page {page} of {total}" as footer text. The tokens are replaced on every page automatically.

What is N-up layout?

N-up puts 2, 4 or 6 source pages onto one sheet, so you can print handouts or save paper.

Is my PDF uploaded to a server?

No. All five tools run 100% in your browser using pdf-lib and pdf.js. Your file never leaves your device.