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 Process Expense Receipt PDFs Without Manual Entry
Process a month of expense receipt PDFs without typing them by hand — extraction, categorisation, and import in one flow.
4 minReadHow to properly redact a PDF
A black rectangle isn't redaction. Here's the proper way to remove sensitive content from a PDF.
5 minReadHow to protect a confidential PDF
Confidentiality is layered. Here's the order of operations for documents that genuinely matter.
5 minReadHow to Protect an Illustration PDF When Sharing
Protect your illustration PDFs when sharing for review — watermarks, passwords, and low-res previews to prevent unauthorised use.
4 minReadHow to Protect Confidential Financial PDFs
Protect confidential financial PDFs with layered defences — passwords, watermarks, flattening, and disciplined distribution.
4 minReadHow to Protect a PDF From Text and Image Copying
Restrict copying of text and images from a PDF — how it works, when it stops casual copying, and what it can't prevent.
3 minReadHow to Protect a PDF From Being Edited
Stop a PDF from being edited with password and permission flags — for contracts, finalised reports, and anything you don't want changed.
3 minReadHow to Protect a PDF From Being Printed
Prevent a PDF from being printed using permission flags — useful for restricted distribution, with realistic security caveats.
3 minReadHow to read a PDF audit trail
Audit trails look intimidating. They're easy to read once you know what each line means.
4 minReadHow to recover a lost PDF password: the realistic options
Lost passwords can't be cracked. Recovery means finding the password or getting a fresh copy.
3 minReadHow to recover a PDF password you forgot
There's no magic key — but there are sensible places to look before declaring a PDF dead.
4 minReadHow to recover content from a failed PDF conversion
Failed conversions need alternate routes. OCR, rasterisation, and manual extraction all work.
4 minReadHow to redact a PDF for court
Redacting for litigation is different from redacting for casual sharing. The bar is higher.
5 minReadHow to redact a PDF for public release
Public release means anyone can probe the redactions. Make sure they hold.
5 minReadHow to Redact a PDF in 30 Seconds
Redaction in the browser, done properly: content removed, not just covered. Thirty seconds from drag-in to download.
3 minReadHow to Redact an Affidavit (Without Compromising the Original)
How to produce a properly redacted affidavit for disclosure — what to remove, what to keep, and how to preserve the original.
4 minReadHow to Redact Bank Account Numbers from PDFs
Remove bank account and sort code numbers from PDFs so you can share documents without exposing client financials.
3 minReadHow to Redact Client Financial Information from PDFs
Remove client financial details from PDFs properly — account numbers, balances, and confidential figures — for safe sharing.
4 minReadHow to Redact Client Information from PDFs (Properly)
How to remove client names, addresses, and account numbers from PDFs so the data is genuinely gone — not just hidden.
4 minReadHow to redact credit card numbers in PDFs
PAN exposure is a PCI-DSS violation in commercial settings. Redact card numbers before sharing.
3 minReadHow to Redact Investor Information from PDFs
Redact existing investor names and terms from PDFs so you can share cap tables and term sheets with new investors selectively.
4 minReadHow to redact medical record numbers in PDFs
Medical record numbers are HIPAA-protected identifiers. Redact before any external sharing.
4 minReadHow to Redact Patient Information for HIPAA Compliance
Redact patient information from PDFs in line with HIPAA — every identifier removed, properly, with no recoverable text underneath.
5 minReadHow to Redact Protected Health Information (PHI) from PDFs
Remove protected health information from PDFs properly so case notes can be shared, taught from, or published.
5 minReadHow to redact Social Security Numbers in PDFs
SSNs are the most stolen identifier in the US. Redact them properly before sharing.
3 minReadHow to Redact Tenant Information from PDFs
Remove tenant names, references, and bank details from PDFs so you can share precedent documents without exposing real people.
4 minReadHow to redact a PDF with OCR
Scanned PDFs are images. Redaction needs OCR first to find the text to remove.
4 minReadHow to remove a password from a PDF you own
You set the password months ago and now it's just friction. Here's how to remove it cleanly.
3 minReadHow to Remove Blank Pages From a PDF Automatically
Strip blank pages out of a PDF — automatic detection plus manual cleanup for borderline cases.
3 minReadHow to Remove Formatting From PDF Text (Strip Styles, Plain Text)
Strip styling from PDF text — colours, fonts, bold — for clean plain text suitable for reuse or republishing.
3 minReadHow to Remove Metadata From a PDF Before Sharing
Strip metadata — author, creator, software, history — from a PDF before public or sensitive sharing.
3 minReadHow to Remove Pages From the End of a PDF
Trim pages from the end of a PDF — for cutting drafts short, removing appendices, or stripping trailing blank pages.
3 minReadHow to Remove a Watermark From a PDF (Yours or With Permission)
Remove watermarks from PDFs you have the right to modify — methods, limits, and when redaction is needed.
3 minReadHow to Rename 50 PDFs Quickly
Fifty badly-named PDFs in 15 minutes. A batch-rename approach that handles the backlog and trains the habit so it never happens again.
4 minReadHow to Rename or Label Pages in a PDF (Page Labels)
Label PDF pages with names — chapters, sections, custom identifiers — instead of plain numeric sequence.
3 minReadHow to Replace Specific Text in a PDF
Replace specific words, phrases, or sections in a PDF — for boilerplate updates, name changes, or content corrections.
3 minReadHow to request signatures from multiple people
Multi-party signing is a workflow problem more than a signing problem. Here's how to structure it.
4 minReadHow to resend a PDF signature request
Resending is usually a one-click action. Here's when to do it and when to do something else.
3 minReadHow to re-sign a PDF after edits: restore trusted state
Re-signing replaces broken signatures with a fresh signature on the current state.
3 minReadHow to revoke access to a shared PDF
Revocation is harder than it sounds with PDFs. Here's what actually works.
4 minReadHow to rotate a PDF on Android
Rotate PDF pages on Android in Chrome to fix scans that came out sideways. Save the corrected file in a minute.
3 minReadHow to rotate PDF pages on iPhone
Fix sideways or upside-down PDF pages on iPhone in Safari. Rotate individual pages or the whole document in seconds.
3 minReadHow to save a webpage as a PDF on iPhone
Save webpages as PDFs on iPhone using Safari, then edit, sign, or share with Flint. Useful for receipts, articles, and confirmations.
3 minReadHow to save a webpage as a PDF on Mac
Save webpages as PDFs on Mac with the print dialog. Then edit in Flint to trim banners, ads, or whole pages.
3 minReadHow to save a webpage as a PDF on Windows
Save webpages as PDFs on Windows with Ctrl+P. Edit with Flint to trim ads, banners, and unwanted pages.
3 minReadHow to Save an Email as a PDF for Records
Save an email as a PDF for records, archiving, or legal purposes — from Gmail, Outlook, Apple Mail, or any client.
3 minReadHow to Save an Hour a Week on PDFs
An hour a week to PDFs is the silent tax. Five concrete changes get every minute back without any major workflow overhaul.
4 minReadHow to save PDF edits to the cloud
Save PDF edits to any cloud service. Edit in Flint locally, then upload to Drive, Dropbox, OneDrive, iCloud, or Box.
4 minReadHow to Scan a Document to PDF on Phone or Scanner
Scan documents directly to PDF from phone or scanner — with OCR for searchability and clean output.
4 minReadHow to scan a document to PDF on iPhone
Scan documents to PDF with your iPhone's built-in scanner, then polish the result in Flint — compress, sign, or edit in Safari.
4 minReadHow to scan a document to PDF on Android
Use Google Drive or your phone's scanner to make PDFs from paper documents, then polish them in Flint.
4 minReadHow to Search PDF Content Quickly
Finding content inside PDFs is fast with the right setup — OS indexing, naming conventions, and PDF-aware search tools.
4 minReadHow to Secure a Medical Record PDF
Secure a medical record PDF with layered protection — passwords, watermarks, flattening — for safe distribution.
4 minReadHow to Secure a Payroll PDF with a Password
Lock payroll PDFs behind a password so payslips and salary data can't be forwarded into the wrong inbox.
3 minReadHow to send a 100MB PDF: realistic options
100MB exceeds email limits. Cloud link, aggressive compression, or splitting are the routes.
3 minReadHow to send a 25MB PDF by email: stay under the limit
25MB is the cap, not the target. Compress to safely under 20MB for reliable delivery.
3 minReadHow to send a confidential PDF securely: protect the content
Confidential sends need encryption and access control. Password, secure link, verified recipient.
4 minReadHow to Send a Consent Form for Electronic Signature
Send a medical consent form for electronic signature and have it back, with audit trail, before the appointment starts.
4 minReadHow to Send a Freelance Contract for Signature
Send a freelance contract for electronic signature and have it back, signed, before you start the actual work.
4 minReadHow to Send a Listing Agreement for Signature (Same Day)
Send a listing agreement for electronic signature and lock the listing before the vendor has time to talk to the other agents.
3 minRead