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overlay-pdf
letterhead
branding
How to Add Letterhead to a PDF on Every Page
Put your letterhead PDF behind every page of a document, or just the first. How underlay and overlay differ, the white-page trap, and page-size gotchas.
Oct 12, 20266 min read
dead-link-debugger
links
link-rot
How to Check Broken Links in a PDF (and Fix Them)
PDFs keep their links long after the pages behind them are gone. Find every dead link in a PDF, test it, then rewrite or remove it without the source file.
Oct 12, 20267 min read
annotation-exporter
annotations
research
How to Export PDF Highlights to Markdown or JSON
Your highlights are stuck inside the PDF. Export them, with the quoted text, notes and page numbers, as Markdown for Obsidian or Notion, or as JSON for scripts.
Oct 12, 20266 min read
scratchpad-margins
note-taking
goodnotes
Add Margins to a PDF for Notes in GoodNotes or Notability
Lecture slides with no room to write? Add margins to a PDF, with ruled, grid, dot or Cornell space beside every page, then annotate it on your iPad as usual.
Oct 11, 20267 min read
barcode-stamp
qr-code
code-128
Add a QR Code to a PDF, or a Barcode on Every Page
Stamp a QR code or Code 128 barcode on every PDF page: one link, the file name, or a numbered code per page. Sizes that scan, and the cases that trip it up.
Oct 11, 20267 min read
signature-ink-optimizer
sign-pdf
signature-png
Make a Signature Transparent: Photo to PNG, No Box
Signed on paper, need it on a PDF without the white box? How to photograph it, turn it into a transparent signature PNG, and place it, all in your browser.
Oct 11, 20267 min read
table-of-contents
bookmarks
organize
Add a Table of Contents to a PDF (and Bookmarks)
A contents page and a bookmark outline solve different problems. When a PDF needs each, and how to add a clickable table of contents without the source file.
Oct 10, 20265 min read
citation-linker
academic
links
Make Citations Clickable in a PDF Thesis or Paper
Link every [1] and (Smith et al., 2020) in a finished PDF to its reference entry or DOI, no Word or LaTeX source needed. Which styles work, and which slip.
Oct 10, 20265 min read
remove-blank-pages
scanning
organize
Remove Blank Pages from a PDF After a Duplex Scan
Duplex scans leave a blank back after every one-sided sheet. How blank-page detection works, which near-blank pages it keeps, and how to check before you remove anything.
Oct 10, 20267 min read
Browse the full archive
Every post on OxygenPDF — 106 in total.
- How to Add Letterhead to a PDF on Every Page
- How to Check Broken Links in a PDF (and Fix Them)
- How to Export PDF Highlights to Markdown or JSON
- Add Margins to a PDF for Notes in GoodNotes or Notability
- Add a QR Code to a PDF, or a Barcode on Every Page
- Make a Signature Transparent: Photo to PNG, No Box
- Add a Table of Contents to a PDF (and Bookmarks)
- Make Citations Clickable in a PDF Thesis or Paper
- Remove Blank Pages from a PDF After a Duplex Scan
- PDF Page Too Large? Fix the 200-Inch Acrobat Limit
- Print Passport Photos at Home at the Exact Size
- Print a Poster on Multiple Pages From Any PDF
- Change Text Color in a PDF Without Retyping It
- Print an ID Card Front and Back on One Page, True Size
- Split Scanned Pages in Half: One Book Spread, Two Pages
- Change PDF Background Color (and When It Can't Work)
- How to Check PDF Page Size in Points, Inches or mm
- Combine PDF Pages Into One Long Page, Free
- Convert Text to Outlines in a PDF (and Keep a Master)
- PSD to PDF: Share Photoshop Files Without Photoshop
- XPS to PDF: Convert XPS and OXPS Files Anywhere
- Digital Signature PDF: Sign With a Real Certificate
- DjVu to PDF: Convert Old Scanned Books and Papers
- MOBI to PDF: Convert DRM-Free Kindle Books
- CSV to PDF: Print a Wide Table That Stays Readable
- Extract Images From a PDF at Full Resolution
- PDF to TIFF: Which DPI and Compression to Pick
- TIFF to PDF: Convert Multi-Page Scans and Faxes
- Convert PDF to Grayscale or Black and White
- SVG to PDF: Keep Vector Art Sharp for Print
- How to Increase PDF Brightness Without Fading the Text
- PDF to SVG: How to Get Real Vectors, Not a Picture
- How to Repair a Corrupted PDF That Won't Open
- How to Make a PDF Look Scanned (and When Not To)
- How to Print a PDF as a Booklet That Folds Right
- TXT to PDF: Convert a Text File Without Wrecking It
- PDF to PowerPoint: Editable Slides or Exact Copies?
- How to Remove Metadata From a PDF (All of It)
- What Is PDF/A? 1b, 2b, 3b and PDF/A-4 Explained
- How to Convert PDF to CBZ for Kobo and KOReader
- PDF to Markdown for LLMs and RAG, Done Locally
- How to Save an Email as PDF With Its Attachments
- EPUB to PDF: Print and Mark Up Your DRM-Free Ebooks
- Convert PowerPoint to PDF, With or Without Office
- How to Password Protect a PDF Before You Email It
- How to Convert HEIC to PDF Without Uploading Your Photos
- Markdown to PDF Without Installing Pandoc or LaTeX
- How to Reverse PDF Page Order and Fix Backwards Scans
- How to Edit a Scanned PDF: Three Routes That Work
- Handwriting OCR: What Actually Reads Handwriting
- PDF Bates Numbering Without Acrobat Pro
- Blank PDF, Sample PDF, Dummy PDF: What You Actually Need
- Why Your PDF Is 38 MB, and What Compression Actually Does
- Best Free PDF Reader & Viewer (2026): 5 Options Compared
- Google Drive OCR Stops at Page 10 and Never Says So
- Make a PDF Searchable: Why Ctrl+F Finds Nothing
- The Honest Open Source PDF Editor Survey for 2026
- PDF to HTML: Why the Output Is a Pile of Divs
- PDF-XChange Editor Alternative: Free, No Watermark, Any OS
- Printable Calendar PDFs: Why Yours Prints Wrong
- Wondershare PDFelement Alternative: What It Sends Out
- Convert Excel to PDF Without Mangling Columns
- How to Remove Watermarks from a PDF Without Ruining It
- How to Speed Read a PDF: What RSVP Actually Buys You
- Print Multiple Pages Per Sheet Without Wrecking the Margins
- PDF Dark Mode: What It Fixes and What It Breaks
- How to Compare Two PDFs and Find Every Difference for Free
- How to Crop PDF Pages and Remove the Margins for Good
- How to Extract Pages from a PDF and Keep Only What You Need
- Printable Graph Paper: Why Your Squares Come Out Wrong
- College Ruled vs Wide Ruled: Which Paper You Need
- PDF Markup Software: What to Check Before You Subscribe
- PDF24 Alternative for Anyone Without a Windows PC
- A Free iLovePDF Alternative for the 15 MB OCR Wall
- Smallpdf Alternative for the Two-Conversions-a-Day Wall
- How to Add Page Numbers to a PDF Without Paying for Acrobat
- Scan to Text: Why Your Photo Reads as Garbage to OCR
- How to Rotate PDF Pages Without Uploading Anything
- How to Convert PDF to Excel Without Retyping Tables
- How to Annotate a PDF So Your Markup Survives Anywhere
- Adobe Acrobat OCR: Where It Hides and What It Costs
- Convert HTML to PDF in Your Browser, No Upload Needed
- OCR Text Recognition: How a Machine Reads Paper
- OCR a Scanned PDF: Make It Searchable and Verify It Worked
- How to Redact a PDF So the Text Is Really Gone for Good
- How to Save a Webpage as a PDF on Any Browser or Phone
- Flatten a PDF: What It Means and When You Need It
- How to Watermark a PDF Without Uploading It Anywhere
- Sejda PDF Editor Alternative for the 3-Tasks-Per-Hour Wall
- Foxit PhantomPDF Alternative That Skips the Watermark
- Online PDF Viewer That Skips the Sneaky Upload
- Adobe Acrobat Alternative: A Free Way to Edit a Simple PDF
- Free PDF Sign and Fill, No Account, No Email Capture
- How to Unlock a PDF Password Without Handing It to Strangers
- Word to PDF Converter That Never Uploads Your Files
- PDF to Word Conversion: What Really Happens to Your Document
- Why Local-First PDF Tools Matter for Privacy and Speed
- How to Convert a PDF to JPG Without the Blurry Mess
- How to Split PDF Pages Without Uploading Anything
- How to Convert JPG to PDF Without the Hidden Costs
- How to Compress a PDF Without Losing Quality — Free
- Free Online PDF Editing: Which Features Actually Work
- PDF to Text Converter: Why It Fails and How to Fix It
- How to Merge PDFs Without Uploading Them Anywhere
- Building PDF Tools with WebAssembly in the Browser
- Fillable PDF Forms Without the $240/Year Adobe Tax