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.
Can't add comments to a PDF? Get annotations working
Comment-blocked PDFs have annotation permissions disabled. Annotate via Flint or unlock first.
3 minReadCan't add a signature to a PDF on iPhone? Here's the route
iPhone signature tools work but are buried. Use Flint or built-in Markup for cleaner results.
3 minReadCan't attach a PDF to Gmail because it's too large?
Gmail caps at 25MB. Compress with Flint and most PDFs slide comfortably under.
3 minReadCan't convert a PDF to Word? Get a clean editable doc
Conversion failures come from restrictions or image-only PDFs. OCR handles both.
3 minReadCan't copy text from a PDF? Get the text out anyway
Text copy failures come from restrictions or image-only PDFs. Both have working solutions.
3 minReadCan't download a PDF from a website? Get the file open
Inline PDFs are downloadable — you just need the right route. Three reliable methods.
3 minReadCan't edit this PDF? Here's how to unlock it for changes
Most uneditable PDFs are either locked or image-only. Identify which and the fix is simple.
3 minReadCan't extract images from a PDF? Pull them out cleanly
Extracting images means converting the PDF to image format. Flint does it page-by-page in one step.
3 minReadCan't fill in a PDF form? Get the fields working
Forms that won't fill have either dead fields or restrictive permissions. Both have working routes.
3 minReadCan't flatten a PDF? Lock layers into final content
Flattening merges layers into final content. The right tool does it in one click.
3 minReadCan't merge PDFs of different sizes? Combine them cleanly
Merging mixed-size PDFs works fine — but visual consistency needs normalising first.
3 minReadCan't open a password-protected PDF? Here's what to try
Password-protected PDFs need the right password — or the owner's help. Here's how to handle each case.
3 minReadCan't open a PDF in the browser? Get past the block
Browser PDF blocks come from viewer settings, plugin conflicts, or file issues. Each has a workaround.
3 minReadCan't print a PDF from iPhone? Get it printing
Most iPhone PDF print issues are AirPrint connection or document size. Both fix quickly.
3 minReadCan't print this PDF? Identify the block and print anyway
PDFs that won't print are usually permission-locked or hitting a driver issue. Fix one or the other.
3 minReadCan't remove a password from a PDF? Here's how
Removing a PDF password needs the right password and the right tool. Flint handles both in one step.
3 minReadCan't rotate a PDF page permanently? Make rotation stick
View-rotation is temporary. Use a tool that rewrites the rotation metadata into the file.
3 minReadCan't save a PDF after editing? Make changes stick
Save failures come from permissions, viewer quirks, or trying to save read-only files. Each has a fix.
3 minReadCan't search text in a PDF? Add a searchable layer
Unsearchable PDFs are image-only. OCR adds a real text layer in one step.
3 minReadCan't sign this PDF? Here's why and how to sign it anyway
Signature failures usually mean the file is restricted or already signed. Diagnose and sign with Flint.
3 minReadCan't upload a PDF because it's too large? Shrink and send
Upload limits exist for every service. Compress in Flint and most PDFs come down to size easily.
3 minReadFix blurry text in a scanned PDF: sharpen with OCR
Blurry scanned text becomes sharp vector text via OCR. One step.
3 minReadFix a locked PDF you own the password for: full access
If you have the password, unlocking is a one-step operation. Remove the lock and work freely.
3 minReadFix a PDF corrupted by conversion: recover what you can
Conversion damage is recoverable through fresh conversion or rasterisation. Don't give up.
3 minReadFix a PDF form that resets every time you open it
Forms that reset weren't flattened. Flatten on save and the data stays.
3 minReadFix a PDF marked as corrupt after signing: recover the signed file
Corruption after signing usually means signing process glitched. Retry or re-sign clean.
3 minReadFix a PDF that asks for a password: open it or remove the lock
Password prompts need the password. Find it, then optionally remove the protection.
3 minReadFix a PDF that opens as a text file: restore the PDF
PDFs opening as text usually have a wrong file association. Re-associate or rename.
3 minReadFix a PDF that prints tiny: get full-size output
Tiny prints come from page-size mismatch. Fix in print dialog or rebuild the PDF.
3 minReadFix a PDF that requires a permission password: regain control
Permission passwords restrict what you can do. Unlock with the owner password to lift restrictions.
3 minReadFix a PDF that shows blank pages: get the content back
Blank-displayed pages have content the viewer can't render. Rebuild and it reappears.
3 minReadFix a PDF that won't attach to email: send it anyway
Attachment failures usually mean size or security filter. Compress or share differently.
3 minReadFix a PDF that won't print: a working diagnostic
Print failures fall into three buckets. Work through them and the PDF prints.
4 minReadFix a PDF too large to email: send it without splitting
Most oversized PDFs come down 80-90% with compression. Send the slimmer version.
3 minReadFix a PDF where redaction still shows: actually hide content
Cosmetic black boxes don't redact. Use a true redaction tool that removes underlying content.
4 minReadFix a PDF where text is invisible: recover hidden content
Invisible text means colour or transparency issue. Recolour or rasterise to reveal.
3 minReadFix a PDF with broken links: restore navigation
Broken PDF links come from bad exports or stale URLs. Rebuild via source or update in Flint.
3 minReadFix a PDF with corrupted fonts: restore readable text
Corrupted fonts produce unreadable PDFs. OCR rebuilds the text layer cleanly.
3 minReadFix a PDF with cut-off content: restore the full page
Cut-off content means content and page size disagree. Resize or re-export to fix.
3 minReadFix a PDF with invisible redaction marks: ensure proper coverage
Missing redaction marks may mean rendering issue or actual content gap. Verify and redo.
3 minReadFix a PDF with misaligned text: get the layout straight
Misaligned text means font substitution or export error. Rebuild and the layout returns.
3 minReadFix a PDF with missing images: restore the visuals
Missing images come from broken embedding or unsupported formats. Rebuild via source or rasterise.
3 minReadFix a PDF with missing pages: recover or rebuild
Missing pages are either truly absent or just invisible. Diagnose, then recover.
4 minReadFix a PDF with overlapping text: separate the layers
Overlapping text comes from font substitution or layout errors. Rebuild the document cleanly.
3 minReadFix a PDF with sideways pages: get every page upright
Sideways pages need permanent rotation. One step in Flint.
3 minReadFix a PDF with wrong page order: reorder cleanly
Out-of-order pages reorder with drag-and-drop in Flint. No need to rescan or re-export.
3 minReadHow to fix a signed PDF that won't open: recover access
Signed PDFs that won't open need careful handling — content recovery without losing signature record.
3 minReadHow to fix OCR mistakes in a converted PDF: clean the text
OCR errors are predictable. Clean systematically in Word after conversion.
3 minReadHow to fix PDF conversion quality: get cleaner output
Conversion quality depends on tool, settings, and source. Optimise each for better output.
4 minReadMultiple signatures not showing on PDF? Show them all
Missing signatures from multi-signer PDFs usually mean flattening order or annotation issues.
3 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 content from a failed PDF conversion
Failed conversions need alternate routes. OCR, rasterisation, and manual extraction all work.
4 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 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 PDF when attachment fails: alternative routes
Attachment isn't the only delivery path. Cloud link, messaging, file transfer all work.
3 minReadHow to share a PDF via link instead of attachment
Link sharing handles any size and updates dynamically. Cloud upload, set permissions, share.
3 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 to Excel conversion losing numbers? Recover the data
Numbers-as-text means encoding issue. Convert with a smart tool and numbers stay numeric.
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