Every Mac has a built-in PDF tool called Preview, and it handles more than most people realize. But it also has a hard limit that trips people up constantly: you cannot change text that’s already in the document. Understanding that distinction — and knowing the right free tools for the jobs Preview can’t do — is everything. This guide covers every realistic scenario, step by step, without pushing you toward paid software you don’t need.
These are the questions behind the frustration — answered directly, with no runaround about which paid app you should buy instead.
- 1 Does Mac come with a free PDF editor already installed? Yes — Preview is Apple’s built-in PDF tool, included free with every Mac since OS X 10.4. It’s already on your Mac right now. You don’t need to download or install anything to use it. It opens any PDF by default when you double-click the file, and it includes a full markup toolbar for highlighting, annotating, signing, filling forms, rearranging pages, and more. The confusion happens because Preview does not let you change existing text — it is not a full document editor, but it does far more than most people realize.
- 2 Why can’t I just click on the text in a PDF and change it in Preview? Because a PDF is fundamentally different from a Word document — it is a fixed-layout format designed to look identical on any device or printer, and the text inside it is embedded as visual content, not editable characters in the way a word processor understands. Think of it like a photograph of a document rather than the document itself. Preview treats the entire page as an image with a markup layer on top. To change words already in the PDF requires software that can decode and reconstruct the underlying content structure — something Preview was never designed to do. This is not a bug or limitation Apple plans to fix; it’s a deliberate architectural distinction.
- 3 What exactly can Preview do with a PDF — what are all its actual free features? More than most people know. Preview can highlight text in multiple colors, underline, strikethrough, add sticky notes, draw freehand, insert text boxes anywhere on the page, add signatures (drawn on the trackpad, captured by camera, or signed on iPhone/iPad), fill in interactive form fields, rotate pages, delete pages, rearrange pages by dragging in the sidebar, merge multiple PDFs into one, extract specific pages into a new file, add a password to encrypt a PDF, and export pages as images. What it cannot do: change existing words, replace images within the document, work with scanned documents (no OCR), or create new form fields.
- 4 What’s the best truly free tool for editing existing text in a PDF on Mac? PDFgear is the strongest genuinely free option with no watermarks, no account required, no daily limit, and no paywall hiding behind a trial period. It runs on Mac (including Apple Silicon), edits existing PDF text, handles image replacement, merges and splits files, converts to and from Word and other formats, and compresses file sizes. LibreOffice Draw is the other solid free desktop option — it’s open-source, processes everything locally (nothing uploaded to servers), and can meaningfully edit PDF content, though the interface is less polished than PDFgear. Both are free forever.
- 5 Are free online PDF editors like Smallpdf and iLovePDF safe to use? For non-sensitive documents, yes — with important privacy caveats. Both Smallpdf and iLovePDF are established, reputable services used by millions of people. Both use HTTPS encryption and delete uploaded files within hours (iLovePDF within 1–24 hours, Smallpdf shortly after processing). Neither is appropriate for anything confidential — tax documents, medical records, legal filings, bank statements, or anything with your Social Security number or financial information. For those, use a desktop tool like PDFgear or LibreOffice that processes files locally on your Mac without uploading them anywhere.
- 6 I have a scanned PDF — an image of a paper document. Can I edit the text in it? Not without OCR — optical character recognition software that converts the image of text into actual editable characters. Preview cannot do this at all. PDFgear includes OCR in its desktop app and handles scanned documents reasonably well. iLovePDF’s online OCR tool is another accessible option. Once OCR has been run, the recognized text becomes selectable and editable. The quality of OCR output depends on the scan quality — a crisp, well-lit scan produces near-perfect results; a blurry photo of a wrinkled page may need manual correction afterward.
- 7 How do I add my signature to a PDF on Mac without printing it out? Preview handles this natively — it is one of its best features and requires no additional software. Open the PDF in Preview, click the Markup toolbar button (the pencil icon), then click the Signature button (looks like a pen nib). You have three options: draw your signature with your finger on the trackpad while pressing any key, hold a signed piece of paper up to your Mac’s camera and Preview captures it, or sign on your iPhone or iPad and it appears on the Mac through Continuity. Once saved, the signature appears in the Signature menu whenever you need it on any PDF. Drag it to the right spot and resize as needed.
Preview is on your Mac right now and is the right tool for the vast majority of everyday PDF tasks. Here is how to do each one — without going to the menus and guessing.
Open any PDF in Preview by double-clicking it. If it opens in a different app, right-click the file, choose Open With, then Preview. Once open, look for the small pencil-in-a-circle icon near the top right of the toolbar — clicking it reveals the full markup toolbar. If the toolbar isn’t visible at all, go to the View menu and choose Show Markup Toolbar. Every editing feature described below lives in this toolbar — highlighting, text boxes, shapes, signatures, and more. The toolbar only appears when you’re in the PDF view, not the thumbnail sidebar.
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Highlight, Underline, or Strikethrough Existing Text In the Markup toolbar, find the Highlight button (looks like a rectangle). Click the small arrow next to it to choose highlight, underline, or strikethrough from the dropdown. Then click and drag over the text you want to mark. Right-click over selected text for a context menu that offers the same options instantly. To change the highlight color, right-click the highlighted passage after applying it and choose the color from the options. Notes can be attached to any highlight — right-click the highlighted area and choose Add Note.
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Add a New Text Box Anywhere on the Page In the Markup toolbar, click the Text button (a capital A inside a box). Your cursor changes — click anywhere on the PDF page to place a text box, then type. Drag the box to reposition it. Use the font controls in the toolbar to change size, color, and style. This is how you fill in a form that doesn’t have interactive fields, or add a note directly on the page rather than as a floating annotation. The text box sits on top of the original document — it does not change the underlying text.
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Sign a Document and Place the Signature Open the Markup toolbar and click the Signature button (pen nib icon). Choose Create Signature from the panel if you haven’t saved one yet. Options: trackpad (press any key while signing with your finger), camera (write your signature on white paper and hold it in front of the camera — Preview captures it automatically), or iPhone/iPad via Continuity. Once the signature is saved, click it in the Signature panel to place it, then drag and resize it to the signature line. Saved signatures persist across all PDFs in Preview going forward.
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Fill in a PDF Form Open the PDF in Preview. If the form has interactive fields (fields you can click and type into), Preview detects them automatically and lets you click each field and type. If the PDF doesn’t have interactive fields — it looks like a form but clicking doesn’t activate anything — use the Text button (step 2 above) to add text boxes over each blank line. This is a workaround but works well for simpler forms. For complex forms with dropdowns, checkboxes, or calculated fields, a more capable tool like PDFgear handles them more reliably.
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Delete, Rearrange, or Extract Pages In Preview, go to View → Thumbnails to show the page sidebar. Select a page thumbnail by clicking it. To delete a page: select it and press the Delete key. To rearrange pages: drag thumbnails up or down the sidebar to reorder them. To extract pages into a new PDF: select the thumbnail(s) you want, then go to File → Export as PDF — this creates a new file with just those pages. To move pages between two open PDFs: open both in Preview, show thumbnails in both, and drag a thumbnail from one sidebar to the other.
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Merge Two PDFs Into One Open the first PDF in Preview and show the thumbnail sidebar (View → Thumbnails). Drag the second PDF file from your Finder directly into the thumbnail sidebar — drop it between pages or at the end to set where it merges in. The files combine immediately in memory. Then go to File → Export as PDF to save the merged result as a new file. Important: use Export as PDF rather than Save — Save overwrites the original file.
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Add a Password to a PDF With the PDF open in Preview, go to File → Export as PDF. In the save dialog, click the Permissions button and check Require Password to Open Document. Set your password and confirm it. Save under a new filename to preserve the unprotected original. Anyone who tries to open the protected PDF will need to enter the password. Preview can also remove passwords from a PDF you already know the password to — open the password-protected file (enter the password when prompted), then export it without the password setting.
- Edit existing text in the document: You cannot click on a word and change it. You can only add new text on top — the original words stay unchanged underneath
- Work with scanned PDFs (images of documents): Preview has no OCR capability — it cannot convert an image of text into selectable, editable characters
- Create fillable form fields: Preview can fill existing form fields but cannot add new ones or create an interactive form from scratch
- Replace embedded images: You cannot swap out a photo or logo inside a PDF using Preview
- Convert to Word, Excel, or other formats: Preview can export PDFs as images, but not as editable Word or spreadsheet files
When Preview isn’t enough, these are the verified free options — matched to what they actually do well, with honest notes on their limitations.
PDFgear is the most capable genuinely free PDF editor for Mac in 2026. No account required to download or use it. No watermarks on saved files. No daily task limits. No trial period that expires. Available through the Mac App Store and at pdfgear.com. It can edit existing text in a PDF — the function Preview lacks entirely — and also handles image replacement, page management, merging, splitting, compression, conversion to Word or Excel, form creation, signing, and OCR for scanned documents. The interface is clean and approachable. The company’s business model is based on its online tools and enterprise partnerships rather than charging individual users. Caveat: the AI Copilot feature processes documents in the cloud — disable it or avoid it for anything confidential. The editing functions themselves run locally.
LibreOffice is a free, open-source office suite that has been around since 2011 and is maintained by a nonprofit foundation. Its Draw component can open a PDF and treat each element — text, images, shapes — as an independently editable object. This makes meaningful text editing possible: click on a text block, change the words, reformat it. Because LibreOffice processes everything entirely on your computer with nothing sent to external servers, it is the right choice for sensitive documents — medical records, legal filings, tax forms, anything with personal information you don’t want uploaded anywhere. The interface is less polished than PDFgear, and complex PDF layouts can look different after editing, but for privacy it’s the strongest free option. Download from libreoffice.org — available for both Intel and Apple Silicon Macs.
Smallpdf is one of the most polished, easy-to-navigate PDF tools available in any browser. Open smallpdf.com, upload your file, and the tool handles compression, merging, splitting, conversion to Word, adding text or annotations, and e-signatures. No installation. No account required for basic tasks. The free plan is limited to two tasks per day — more than enough for occasional use, but frustrating if you’re working through a batch of documents. Files are automatically deleted from Smallpdf’s servers after processing. Do not upload confidential documents to any online tool. The paid plan at $9/month removes daily limits if you use it regularly. Smallpdf’s free tier is excellent for the person who needs to compress a PDF to email it, or merge two documents once in a while.
iLovePDF offers over 26 PDF tools entirely in the browser, with a more generous free tier than most competitors — no strict daily limit on basic operations. Tools include merging, splitting, compressing, converting to and from Word/Excel/PowerPoint/JPG, rotating, adding page numbers, watermarking, signing, and editing text and images. iLovePDF is GDPR-compliant (Barcelona-based) and deletes uploaded files within 1 to 24 hours. It also has a downloadable Mac app if you prefer to keep things off the browser. The tool is particularly good for batch operations — merging many files, splitting a large document — where Smallpdf’s daily limit gets in the way. Still: no confidential documents.
Sejda is the strongest online tool for actually editing existing words in a PDF — not just adding text boxes on top, but genuinely rewriting what’s already there. This puts it in a different category from Smallpdf’s free tier, which leans toward annotation. Sejda’s free plan allows three tasks per hour, which resets — so if you’re patient, you can get a fair amount done without paying. Sejda is based in the Netherlands and automatically deletes uploaded files after two hours, which is one of the strongest data-deletion policies among online PDF tools. A desktop app is also available for all platforms including Mac, which handles everything locally if you prefer not to upload. The paid plan starts at $7.50/month if you regularly need more than three tasks per hour.
Apple Pages — the free word processor included with every Mac — can import a PDF and convert it into an editable Pages document. Once imported, the text becomes fully editable. The significant caveat: complex formatting rarely survives the conversion cleanly. Columns may collapse, tables can shift, images may detach from their original positions, and fonts may substitute. For a simple one-column PDF with mostly text — a letter, a plain report, a form-style document — Pages works surprisingly well. For a PDF with complex layouts, columns, tables, or graphics, the reformatting headache often isn’t worth it. To try: open Pages, go to File → Open, select the PDF, and Pages will import it. Then edit and export back to PDF via File → Export To → PDF.
Which tool is right depends entirely on what you’re trying to do. Use this table to match your task to the right free option before downloading anything.
| Tool | Cost | Edit Existing Text? | Sign & Fill Forms? | OCR (Scanned)? | Merge/Split? | Stays on Mac? | Best For |
|---|---|---|---|---|---|---|---|
| Preview (built-in) | $0, always | No | Yes | No | Yes | Yes — local | Signing, filling forms, annotating, page management |
| PDFgear | $0, always | Yes | Yes | Yes | Yes | Yes — local | Full free editing, OCR, conversion — best all-rounder |
| LibreOffice Draw | $0, always | Yes | Basic | No | Via Draw | Yes — local | Sensitive documents, privacy-critical editing |
| Smallpdf | Free (2/day) | Add-on only | Yes | Paid only | Yes | Uploads to cloud | Quick one-off compress, merge, convert — non-sensitive |
| iLovePDF | Free | Add-on only | Yes | Yes | Yes | Uploads to cloud | Batch merge/split, 26 tools — generous free tier |
| Sejda | Free (3/hr) | Yes — online | Yes | Limited | Yes | Desktop app option | Editing existing text online; files deleted in 2 hrs |
| Apple Pages (import) | $0, built-in | Yes | Re-export as PDF | No | No | Yes — local | Simple text-heavy PDFs where formatting doesn’t matter |
Features verified across multiple independent reviews. Tool capabilities and pricing tiers change — confirm current features at each provider’s website. “Edit Existing Text” means changing words already in the PDF, not adding new text boxes on top. “Add-on only” means the tool can overlay new text but cannot rewrite the document’s original content.
The right tool depends entirely on the specific task. These are the most common real-world situations — with the direct answer for each one.
Preview does this natively — no additional software needed. Open the PDF in Preview, click the Markup toolbar (pencil icon top right), click the Signature button, create your signature if you haven’t already (trackpad, camera, or iPhone), then click your saved signature to place it on the document. Drag it to the signature line. Go to File → Export as PDF to save the signed version as a new file. Total time once you’ve set up your signature: under 60 seconds. This works for contracts, permission slips, authorization forms, and any document requiring a signature.
Try Preview first. Open the PDF and click a form field — if it highlights and lets you type, the form has interactive fields and you’re done. Fill in each field, go to File → Export as PDF to save. If clicking the fields doesn’t work, use Preview’s Text tool (capital A in the Markup toolbar) to manually place text boxes over each blank line. For more complex forms with checkboxes, dropdowns, or calculated fields that Preview handles poorly, PDFgear does a better job with interactive forms. Both are free.
Preview cannot do this — at all. Your options: download PDFgear (free, no account) for the most capable free desktop solution, or use Sejda online (free, 3 tasks/hour) without downloading anything. In PDFgear: open the PDF, go to the Edit tab, click on the text you want to change, and type. If the text is inside an image layer rather than a text layer — common in PDFs exported from design software or scanned — it may not be selectable. In that case, the workaround is to place a white rectangle over the existing text using Preview’s shape tool, then add a new text box on top with the corrected text. Imperfect but functional for small corrections.
A scanned PDF is essentially a photograph of a page — Preview sees it as an image and cannot select or edit any text in it. You need OCR to make the text editable. PDFgear’s desktop app includes free OCR — open the file, use the OCR function, and the recognized text becomes editable. iLovePDF also offers OCR in the browser. After OCR runs, review the result carefully: common OCR errors include confusing “1” with “l,” “0” with “O,” and similar characters. Scan quality matters enormously — a crisp flatbed scan produces near-perfect OCR; a phone photo of a crumpled page may need significant correction.
Preview handles this without downloading anything. Open the first PDF. Show the thumbnail sidebar with View → Thumbnails. Drag additional PDF files from Finder directly into the sidebar to merge them in. Drag thumbnails to reorder pages. Go to File → Export as PDF to save the combined file. For merging many files at once, iLovePDF’s browser tool lets you drag in multiple files and set their order before merging — faster than the Preview method when you’re combining five or more documents. Both are free.
Do not use any online tool for documents containing Social Security numbers, medical records, bank account information, tax data, legal filings, or anything else you would consider sensitive. For sensitive documents, your options are Preview (built-in, local), PDFgear’s editing functions (which run locally — just avoid the AI Copilot feature which does upload), or LibreOffice Draw (fully local, nothing ever sent to a server). LibreOffice is the most privacy-conservative choice: open-source code you can inspect, no account, no telemetry by default, and absolutely nothing leaves your computer during any part of the editing process.
These are the things people search for after spending twenty minutes clicking the wrong buttons.
In Preview, pressing Command-S (Save) overwrites your original file. If you want to keep the original and save your edited version separately, use File → Export as PDF and give it a new name. This is one of the most common mistakes people make in Preview — they highlight and annotate a PDF, hit Save, and then realize the original is gone. Get into the habit of exporting rather than saving, and your originals stay intact.
Some PDFs are locked with permissions that restrict annotation, printing, or editing. If you’re trying to click in a form field and nothing responds, or the markup toolbar is grayed out, the document has editing restrictions. To check: go to File → Get Info in Preview and look for the Permissions section. If the document has an owner password protecting editing, you’ll need either the password or a different tool to work around it. For a PDF you legitimately own or need to fill in (like a government form that’s incorrectly locked), PDFgear and Sejda can often bypass annotation restrictions and let you fill the form.
If the pencil icon in Preview is missing or the toolbar won’t appear: first confirm you have a PDF open, not an image file — the markup toolbar only appears in PDF view. If it’s a PDF and the toolbar is still missing, go to View → Show Markup Toolbar. If that option is grayed out, the PDF may have security restrictions preventing annotation. A quick fix: go to File → Print, then click the PDF dropdown at the bottom left of the print dialog and choose Save as PDF — this flattens the file and removes most restrictions, creating a fresh editable copy.
Need to cover a word or section you can’t directly edit? In Preview’s Markup toolbar, choose the Rectangle shape tool. In the color options, set both the fill and border to white. Draw the white rectangle over the text you want to hide — it covers it completely. Then use the Text tool to add replacement text on top. This is a workaround, not true editing — if someone opens the file’s structure in a specialized viewer, the original text is still technically there underneath. For a truly clean edit, use PDFgear or Sejda to actually remove and replace the underlying text.
The Files app on iPhone and iPad has basic PDF markup built in — tap a PDF in Files, then tap the pencil icon to draw, add text, and sign. For more capable mobile editing, iLovePDF and PDFgear both have free iOS and Android apps that bring most of their desktop functionality to the phone. Apple’s built-in Markup tool works well for signing and annotating on the go. If you start editing a PDF on iPhone and want to continue on Mac, save to iCloud Drive and open it in Preview — iCloud keeps the file in sync automatically.
This guide is for general informational purposes. Software features, free tier limitations, and pricing for all tools mentioned change frequently — verify current capabilities at each provider’s website before downloading or uploading files. Preview feature descriptions reflect macOS capabilities as of mid-2026; specific menu paths may vary slightly between macOS versions. PDFgear, LibreOffice, Smallpdf, iLovePDF, and Sejda are independent third-party products not affiliated with Apple. Never upload documents containing personally identifiable information, financial data, or medical records to any online PDF tool. For sensitive documents, use locally-installed software that processes files on your own computer. LibreOffice is free and open-source software distributed under the Mozilla Public License; visit libreoffice.org to verify authenticity before downloading. This content is not sponsored by or affiliated with any software company mentioned.