How to Edit a PDF for Free Online in 2026

PDFs were designed to be un-editable — that's the point of the format. But sometimes you need to make changes: fill in a form, add a signature, remove a page, compress the file, or combine multiple PDFs. Here's how to edit PDFs for free without buying Adobe Acrobat.

What Kind of PDF Editing Do You Need?

The term "edit PDF" covers very different tasks, and each has different free solutions:

Compress a PDF (Reduce File Size)

The most common PDF "edit" is making it smaller for email. Tools Oasis PDF Compressor reduces PDF file sizes by compressing images and removing unnecessary metadata — all in your browser without uploading to a server.

1. Open Tools Oasis PDF Compressor
2. Drop your PDF on the upload area
3. Choose your compression level
4. Download the compressed PDF

Merge Multiple PDFs

Need to combine multiple PDF files into one document? Tools Oasis PDF Merge lets you drag, drop, and reorder pages from multiple files:

1. Open Tools Oasis PDF Merge
2. Upload all the PDFs you want to combine
3. Drag to reorder files and pages
4. Download the merged PDF

Everything is processed locally in your browser — your documents never leave your computer.

Fill in PDF Forms

Most PDF form filling doesn't require special software:

• macOS Preview: Open the PDF, click on form fields, and type. Preview handles most interactive PDF forms perfectly.
• Adobe Acrobat Reader (Free): The free version supports form filling, digital signatures, and basic annotations.
• Microsoft Edge: Open the PDF in Edge and use the built-in form filling and annotation tools.
• Firefox: Firefox's PDF viewer supports form filling and saving the completed form.

Add Text, Signatures, and Annotations

On macOS (Preview)

Preview is the most underrated free PDF editor. Open any PDF in Preview and you can:

• Add text boxes anywhere on the page
• Draw shapes, arrows, and highlights
• Add your signature (draw with trackpad, scan, or photograph)
• Rearrange, delete, or rotate pages in the sidebar

On Windows (Edge or Adobe Reader)

• Microsoft Edge: Open PDF > use the toolbar for highlighting, text notes, and drawing
• Adobe Reader: Tools > Fill & Sign for text and signatures, or Comment for annotations

Change Existing Text in a PDF

This is the hardest PDF edit to do for free. Your options:

1. LibreOffice Draw: Opens PDFs and lets you edit text directly. Free and offline. Results vary with complex layouts.
2. Convert to Word: Open the PDF in Word or Google Docs, edit the text, then save back to PDF. See our PDF to Word guide.
3. Sejda (Online): Free online PDF editor that lets you edit existing text. Limited to 3 tasks per day and 200 pages.

Reality check: Free tools for editing existing PDF text are limited. If you regularly need to modify PDF content, Adobe Acrobat Pro or a similar paid tool is worth the investment.

Remove or Rearrange Pages

• macOS Preview: Show the sidebar (View > Thumbnails), then drag pages to reorder or press Delete to remove
• Tools Oasis: Use PDF Merge to combine specific pages from multiple documents in any order
• Chrome: Open the PDF, press Ctrl+P / Cmd+P, choose "Save as PDF," and specify which pages to include

Privacy Considerations

When editing PDFs online, always check where your files are processed:

• Browser-based tools (like Tools Oasis) process everything locally — your files never leave your device
• Server-based tools (like iLovePDF, Smallpdf, Sejda) upload your files for processing — check their privacy policies
• Desktop software (Preview, LibreOffice, Adobe Reader) works completely offline

For sensitive documents, always use local or offline tools.