Articles
The Flint PDF library
Short, practical pieces on PDFs — fixing a typo, signing a contract, getting a file under 25 MB, picking the right format, dealing with awkward scans. 965 articles and counting.
How to Add a Cover Page to a PDF Without Re-Exporting the Whole File
Add a polished cover page to any finished PDF by merging a designed first page onto the front, without re-exporting the original.
3 minReadHow to Add a Footer to a PDF With Page Numbers, Dates, and Author Info
Add a consistent footer to every page of a PDF — page numbers, date, author — without touching the original Word file.
4 minReadHow to Add a Header to a PDF (Document Title, Section, Author, Logo)
Add a clean, repeating header to every page of a PDF without re-exporting the source document.
4 minReadHow to Add Page Numbers to a PDF Without Losing the Original Layout
A practical walkthrough for adding page numbers to a PDF — including how to skip cover pages, choose a position, and keep your original formatting intact.
4 minReadHow to Add a Stamp to a PDF (Approved, Paid, Received, Custom)
Stamp PDFs with APPROVED, PAID, RECEIVED, or custom image stamps — single-page or every page, with full control.
3 minReadHow to Add a Table of Contents to a PDF With Clickable Links
Add a clickable table of contents page to a finished PDF so readers can jump straight to sections.
4 minReadHow to Add a Watermark to a PDF for Drafts, Confidentials, and Branding
Walk through adding text or image watermarks to a PDF, including diagonal DRAFT stamps, faint logo backgrounds, and per-page exclusions.
4 minReadHow to Add Attachments Inside a PDF (Files, Spreadsheets, Images)
Embed supporting files — spreadsheets, images, original source documents — directly inside a PDF for self-contained delivery.
3 minReadHow to Add Bookmarks to a PDF So Readers Can Actually Navigate It
Add a navigable bookmark sidebar to long PDFs so readers can jump straight to chapters, sections, and appendices.
4 minReadHow to Add Form Fields to a PDF (Text, Checkboxes, Signatures)
Add fillable form fields to any PDF — text inputs, checkboxes, dropdowns, signature fields — so recipients can complete it on screen.
5 minReadHow to Add Clickable Hyperlinks to a PDF (Web Links, Email, Internal)
Turn URLs, emails, and section references into clickable hyperlinks inside a PDF.
3 minReadHow to Add Images to a PDF (Photos, Logos, Diagrams, Screenshots)
Insert logos, photos, screenshots, or diagrams into a finished PDF with full control over size and placement.
3 minReadHow to Add or Edit PDF Metadata (Title, Author, Keywords)
Edit PDF title, author, subject, and keywords — the metadata that drives search results, library systems, and document management.
3 minReadHow to Add Multiple Pages to a PDF From Different Sources
Add new pages to an existing PDF — from other PDFs, from images, or as blank templates — without disturbing the original.
3 minReadHow to Add Notes and Comments to a PDF for Review
Add sticky notes, highlights, and review comments to a PDF without changing the underlying content.
3 minReadHow to Add Editable Text Boxes to a PDF
Add editable text boxes to any PDF — for filling forms, labelling images, or writing notes directly on the page.
3 minReadHow to Attach a PDF to an Email Without Hitting Size Limits
Get a PDF attached to an email even when it exceeds Gmail, Outlook, or corporate size limits.
3 minReadHow to Batch Merge PDFs in One Pass
Combine many PDFs into one in a single operation, with ordering, bookmark preservation, and optional compression.
3 minReadHow to Batch Rename PDFs With a Consistent Naming Convention
Rename whole folders of PDFs in one go with a naming convention that survives sorting, search, and archiving.
3 minReadHow to Bookmark Multiple Pages in a PDF for Quick Navigation
Bookmark multiple pages in a long PDF efficiently — build a navigable outline without doing each one by hand.
3 minReadHow to Build a PDF Portfolio for Design, Photography, or Writing
Build a polished PDF portfolio that loads fast, looks designed, and tells your story across 10-20 pages.
4 minReadHow to Change PDF Margins for Printing or On-Screen Viewing
Resize PDF margins for printing, binding, or screen reading — without re-exporting from Word.
3 minReadHow to Change PDF Page Size (A4 to Letter, A3 to A4, Custom)
Resize a PDF to a different page size — A4 to Letter, A3 to A4, custom — with control over how the content scales.
3 minReadHow to Change the Author of a PDF
Update the author field on a PDF's metadata — useful for ghostwriting, white-labelling, and document privacy.
3 minReadHow to Change the Colour of Text in a PDF
Change the colour of text in an existing PDF — for branding, highlighting changes, or accessibility.
3 minReadHow to Change the Language Setting of a PDF for Accessibility
Set the document language metadata on a PDF so screen readers, search engines, and accessibility tools handle it correctly.
3 minReadHow to Check if a PDF is Signed and Verify the Signature
Verify whether a PDF has been digitally signed, check who signed it, and confirm the signature is still valid.
3 minReadHow to Check if a PDF is Accessible (Screen Readers, Tags, Alt Text)
Check whether your PDF is accessible for screen readers — covering tags, alt text, reading order, and document language.
4 minReadHow to Check the Page Count of a PDF Quickly
Find a PDF's page count quickly — in any reader, file manager, or batch across a whole folder.
3 minReadHow to Combine JPG Files Into a Single PDF
Combine several JPG images into one PDF — for receipts, photo evidence, or scan stitching.
3 minReadHow to Combine PNG Files Into a PDF Without Losing Quality
Combine multiple PNGs — screenshots, diagrams, design exports — into a single PDF with no quality loss.
3 minReadHow to Combine Scanned Pages Into a Single Searchable PDF
Combine separate scans into one searchable PDF — with OCR, deskew, and clean compression.
4 minReadHow to Compare Two PDFs and Spot the Differences
Compare two PDF versions to find every text, layout, or page-level difference between them.
3 minReadHow to Compress a PDF by Half Without Visible Quality Loss
Cut a PDF's size by 50% without visible quality loss — what to compress, what to leave, and the right settings.
3 minReadHow to Compress a PDF Specifically for Email Attachments
Compress a PDF down to a size that fits Gmail, Outlook, and corporate email attachment limits.
3 minReadHow to Compress a PDF for Uploading to Web Forms and Portals
Compress a PDF to meet web form upload limits — visa applications, job forms, government portals.
3 minReadHow to Compress a PDF to Under 100KB
Compress a PDF down to under 100KB — what survives, what gets sacrificed, and the real tactics for tight limits.
3 minReadHow to Compress a PDF to Under 1MB
Compress a PDF down to under 1MB — practical tactics for tight upload limits without ruining quality.
3 minReadHow to Compress a PDF to Under 200KB
Get a PDF under 200KB — realistic tactics, image handling, and what to drop when limits are strict.
3 minReadHow to Compress a PDF to Under 500KB
Compress a PDF under 500KB — a common form upload sweet spot that preserves most visible quality.
3 minReadHow to Compress a PDF With Lots of Images Without Ruining Them
Compress a PDF packed with images — portfolios, photo essays, image-heavy reports — without ruining visible quality.
4 minReadHow to Compress a Photo PDF (Scans, Photographic Documents)
Compress scanned or photo-based PDFs — IDs, contracts, photographic documents — without losing clarity.
3 minReadHow to Compress Multiple PDFs at Once
Compress whole folders of PDFs in one go — same settings applied across the batch.
3 minReadHow to Convert a Static PDF Into a Fillable Form
Turn a flat PDF — a scanned form, a Word export, a static template — into a fillable form anyone can complete on screen.
4 minReadHow to Convert Handwritten Notes Into a PDF
Turn handwritten notes — meeting scribbles, lecture pages, journal entries — into a searchable PDF.
4 minReadHow to Convert Receipts to PDF for Expense Reports
Convert receipt photos into a single tidy PDF for expense reports — with OCR for searchable text and tidy naming.
3 minReadHow to Copy Text From a Locked or Restricted PDF
Extract text from a PDF with copy restrictions — when you have the right to — using unlock, OCR, or re-export.
3 minReadHow to Create a Blank PDF for Forms, Notes, and Templates
Create a blank PDF — single page or multi-page — in any standard size, for use as a template, form base, or note page.
3 minReadHow to Create a PDF From a Website or Web Page
Save any web page as a PDF — full page or selected area — for archiving, sharing, or offline reading.
3 minReadHow to Create a PDF From Photos in Order
Combine a set of photos into one PDF, in the order you choose, with rotate and compress along the way.
3 minReadHow to Create a PDF Portfolio of Your Work That Gets Opened
Build a polished PDF portfolio of your work — what to include, how to sequence it, how to keep the file small enough to actually send.
4 minReadHow to Crop a PDF to Remove Unwanted Margins or Content
Crop pages in a PDF — remove margins, strip headers, trim unwanted areas — across all pages or per page.
3 minReadHow to Deskew a Scanned PDF for Clean, Straight Pages
Straighten skewed scans so pages sit level — improves OCR accuracy and document quality.
3 minReadHow to Detect Whether a PDF Has Been Tampered With
Identify whether a PDF has been altered since it was created or signed — signature integrity, metadata checks, version history.
4 minReadHow to Digitally Sign a PDF With a Verifiable Signature
Add a real, verifiable digital signature to a PDF — not just a pasted image, but a cryptographic signature with an audit trail.
4 minReadHow to Duplicate a Page in a PDF (One or Many Times)
Duplicate one or more pages in a PDF — for template pages, repeated forms, or content batching.
3 minReadHow to Edit a PDF Without Acrobat (Free Browser Alternatives)
Edit PDFs without Adobe Acrobat — text edits, page operations, forms, signatures. All in a browser, all free.
4 minReadHow to Edit a PDF on a Chromebook (Free, No Install)
Edit PDFs on a Chromebook with no install — covering text edits, page operations, signing, and conversion.
3 minReadHow to Edit a PDF on iPhone Without Buying Software
Edit PDFs on iPhone with no app install — text, signatures, page operations, all in mobile Safari.
3 minReadHow to Edit a PDF on Linux Without Wine or Compatibility Layers
Edit PDFs on Linux without Wine or Acrobat — browser-based tools plus command-line workflows.
4 minRead