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 Stop Scanning and Emailing PDFs
Scanning a PDF you already have a digital version of is the most wasteful PDF habit. Here is what to do instead — and when scanning is still the right call.
3 minReadHow to Stop the PDF Version Mess
Version chaos is preventable with three rules: clear convention, drafts folder, signed equals locked. Here is the system.
4 minReadHow to tell if a PDF has been edited
PDFs leave fingerprints when they're edited. Here's where to look.
4 minReadHow to tell if a PDF is encrypted
Sometimes 'protected' just means a flag in the file. Here's how to confirm a PDF is genuinely encrypted.
3 minReadHow to track a pending PDF signature
Pending signatures need visibility, not vibes. Here's how to track and nudge.
3 minReadHow to Track Signed PDFs Without Losing Them
Signed PDFs disappear into folders. A four-part system — log, folder, naming, backup — keeps every contract findable for the long haul.
4 minReadHow to Train Your Team on PDFs
Thirty minutes of team training on PDFs prevents months of confusion. Here is a tight agenda that lands the basics.
4 minReadHow to Use PDF Tools on Multiple Devices
Browser-based PDF work means the same toolkit on every device. Here is the multi-device setup that just works.
3 minReadHow to verify a signed PDF is authentic
Don't rely on the visible signature. Verify the underlying integrity in three steps.
4 minReadHow to vet an online PDF editor for your firm
Vetting takes an afternoon and saves years of cleanup. Here's the checklist.
5 minReadHow to Watermark a Confidential Pitch Deck
Watermark a confidential pitch deck per recipient — leaks become traceable, casual forwarding becomes friction.
3 minReadHow to Watermark a Design PDF Before Showing a Client
Watermark a design PDF before sharing — protect unpaid work, signal professionalism, and avoid the client-uses-the-draft scenario.
3 minReadHow to Write PDF Naming Conventions That Stick
Most naming conventions die because they're too complex. Here is a short, sticky convention plus a template you can adopt today.
3 minReadThe Inbox-to-PDF Workflow
Email is where PDFs arrive; your file system is where they should live. A 90-second pipeline gets every PDF from inbox to archive without friction.
3 minReadInsert a blank page into a PDF
Blank page insertion — for divider pages, even-page padding, or space for written notes.
3 minReadInsert a cover page into a PDF
Cover-page insertion — add a title page, branded cover, or fax sheet as page 1 of any PDF.
3 minReadIntroduction to electronic signatures
A friendly first look at e-signatures and how to use them with confidence.
4 minReadIntroduction to online PDF editors
What online PDF editors are good at, and how they differ from desktop tools.
3 minReadIntroduction to PDF compression
What compression does, what it doesn't touch, and how much smaller to expect.
3 minReadIntroduction to PDF conversion
A short guide to converting between PDFs and other common formats.
4 minReadIP and device info in signed PDFs
IP and user agent in a signing log are circumstantial evidence. Useful, but not infallible.
3 minReadIs a drawn signature legally valid?
Drawn signatures pass legal muster nearly everywhere. The few exceptions are narrow.
3 minReadIs a photo of a signature legally valid?
Photos of signatures are common and usually valid. The risks are about provenance, not the form itself.
4 minReadIs a typed signature legally valid?
Typed signatures are valid wherever electronic signatures are valid — which is nearly everywhere.
3 minReadIs Acrobat Pro tax-deductible? (And other PDF tools)
Are PDF editors tax-deductible? In most jurisdictions, yes. Here is the plain-language version.
4 minReadIs Adobe Acrobat worth the money in 2026?
Acrobat is excellent and expensive. For some people it is worth every penny. For most, it is not. Here is how to tell which one you are.
5 minReadIs DocuSign overkill for most businesses?
DocuSign is the right tool for the wrong number of customers. Here is how to tell whether you are one of them.
5 minReadIs Flint PDF worth it?
Flint is not worth it for everyone. Here is the honest verdict by use case.
4 minReadIs it safe to edit PDFs online?
Some online PDF tools process in your browser. Others upload your file and keep it. Know which is which.
4 minReadIs it safe to use free PDF tools?
Free tools often mean you're the product. Some don't — here's how to tell.
4 minReadISO 27001 and your PDF tools
ISO 27001 puts the tools you use into scope. Choose vendors that simplify the audit story.
4 minReadLocal PDF edit vs server-side PDF edit
Local vs server-side PDF editing differs on where the work happens. Here is what each means for you.
5 minReadMac Preview vs Flint for PDF editing
Preview's free and built-in; Flint adds real text editing. Here's when each one wins on a Mac.
4 minReadMerge bank statements into one PDF
Loan applications, accountant submissions, audits — combine statements into a single chronological PDF without uploading them anywhere.
4 minReadMerge multiple scanned pages into one PDF
When the scanner saves each page as its own file, here's how to combine them into one ordered, properly rotated PDF.
4 minReadMerge PDF and JPG into one file
Stitch PDFs and JPG images into a single file — for expense reports, evidence packs, application bundles.
3 minReadMerge PDF with password-protected files
Password-protected PDFs need unlocking before merging. Here's the workflow when some or all your sources have passwords.
4 minReadMerge PDFs in alphabetical order
When filenames define the order — chapters, exhibits, lots — Flint sorts alphabetically as soon as you drop the files in.
3 minReadMerge PDFs and keep bookmarks
Bookmark-preserving PDF merging — combine reports, books, and chaptered documents without flattening their outlines.
4 minReadMerge PDFs and keep page numbers
Merging PDFs with sensible page numbers — keep the originals, or renumber the whole document, without re-rendering.
4 minReadMerge PDFs by drag and drop
Drag, reorder, merge. The fastest way to combine PDFs in a browser, with no installs and no upload limits.
3 minReadMerge PDFs in the browser
Browser-native PDF merging. Files stay local, the tool stays free, and the output downloads in seconds.
3 minReadMerge PDFs of different sizes
A4 and Letter and A3 all in one merged PDF — keep them mixed, or normalise to one size during the merge.
4 minReadMerge PDFs with rotated pages
Mixed-rotation PDFs merge cleanly in Flint — landscape and portrait coexist, sideways scans stay sideways until you fix them.
3 minReadMerge PDFs without installing software
The IT-friendly way to merge: nothing to install, nothing to approve, just a browser tab and your files.
3 minReadMerge PDFs without watermark
Watermark-free PDF merging. The output you download is yours, unbranded, ready to send.
3 minReadMerge receipts into one PDF
Expense reports done right: receipts in date order, in one tidy PDF, ready for finance.
3 minReadMerge resume and cover letter PDF
The right way to bundle a cover letter and CV — one clean PDF, the order that recruiters expect, no faff.
3 minReadPDF metadata redaction explained
Metadata is the invisible second leak in any PDF you share. Strip it as part of redaction.
4 minReadMove a PDF page to the beginning
Promote a page to the front of the document — for moving a summary, cover, or key chart to position one.
3 minReadMove a PDF page to the end
Send a page to the back of the document — for moving an appendix, a signature page, or a stray cover to its rightful spot.
3 minReadNative PDF vs converted PDF
Native PDFs and converted PDFs behave differently in edit and conversion. Here is why and what to do about it.
4 minReadNumber PDF pages starting from 3
Start page numbering after the cover and contents — page 3 of the file becomes page 1 of the numbering scheme.
4 minReadOCR PDF vs image PDF: what's the difference?
An image PDF is a picture. An OCR PDF is searchable. Here is the practical difference.
4 minReadOwner password vs user password explained
Two passwords, two purposes. Here's which one stops people opening the file, and which one stops them editing it.
3 minReadPDF/A vs standard PDF: a plain-language guide
PDF/A explained in plain language, including who actually needs it.
4 minReadPDF archival (PDF/A) vs regular PDF
PDF/A guarantees a PDF will still open in 50 years. Most documents don't need that. Here is when it does.
4 minReadPDF audit trails explained
The audit trail is what makes an e-signature defensible. Here's what to expect inside one.
4 minReadPDF blocked by corporate email filter? Here's the route forward
Corporate filters block PDFs for various reasons. Work with IT or use approved channels.
3 minReadPDF certificate of completion, explained
The certificate is your legal receipt for a signed PDF. Here's what each field means.
4 minRead