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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.
Add comments to PDF for review
Comments are the lingua franca of PDF reviews — here's how to leave clear, threadable feedback in any PDF.
4 minReadAnnotate PDF for academic review
Peer review and academic critique — structured commentary on PDFs with attention to detail and rigour.
4 minReadAnnotate PDF for design review
Design review on PDF — arrows, shapes, ink, comments. Communicate alignment, colour, and layout feedback in place.
4 minReadAnnotate PDF for legal review
Legal markup with rigour — clause-level highlights, change proposals, concern notes. Trackable, distributable, professional.
4 minReadAnnotate PDF for students
Study annotations done right — highlights, notes, freehand on lecture PDFs. Browser-based so it works on the school laptop.
4 minReadAnnotate PDF with arrows
Arrows draw the eye. Use them in PDFs to point at the exact thing you're commenting on.
3 minReadAnnotate PDF with colour-coded highlights
A colour system turns highlights into structured feedback — recipients understand intent at a glance.
4 minReadAnnotate PDF with freehand ink
When typed annotations are too rigid, freehand ink lets you sketch corrections and circle naturally. Great on iPad with Pencil.
4 minReadAnnotate PDF with highlights
Highlight text passages for emphasis, review, or study — drag over text, pick a colour, save the marked file.
3 minReadAnnotate PDF with shapes
Shapes for region-level annotation — circle a chart, box a paragraph, line up an alignment issue.
3 minReadAnnotate PDF with stamps
Stamps signal status quickly — 'Approved', 'Draft', 'Confidential'. One click puts the right stamp on the right page.
3 minReadAnnotate PDF with sticky notes
Sticky notes are the standard PDF comment format — anchored to a position, expandable, easy for reviewers to find.
3 minReadCrop pages in a PDF
Margin trimming and content focus — crop one page or every page to remove whitespace, crop marks, or distracting edges.
4 minReadDelete blank pages from PDF
Blank pages from duplex scans or empty form sections — delete them in one pass.
3 minReadDelete cover page from PDF
Cover pages, title pages, fax sheets — gone in one click. The document underneath becomes the new page 1.
3 minReadDelete first page of PDF
First page out — for stripping cover sheets, fax sheets, or unneeded title pages.
3 minReadDelete last page of PDF
Last page out — for trimming disclaimers, blank pages, or anything that shouldn't be the document's final word.
3 minReadDelete multiple pages from PDF
Multi-page deletion in one pass — pick the pages, confirm, save the trimmed document.
3 minReadDelete pages by range from PDF
Range-based deletion — type page ranges and Flint deletes exactly what you specify.
3 minReadDelete pages from a large PDF
Multi-hundred-megabyte PDFs handled locally in the browser — delete pages without an upload queue.
4 minReadDelete pages from a protected PDF
Password-protected PDFs need unlocking before page deletion. Here's the two-step flow.
4 minReadDelete pages from scanned PDF
Scanned PDFs often need cleanup — duplicate pages, blanks, mis-fed sheets — Flint handles all of them.
3 minReadDelete pages with watermarks
Watermarked pages identified and removed — for cleaning up draft markers, sample stamps, or trial-version PDFs.
4 minReadDelete pages without Acrobat
Acrobat-free PDF page deletion — browser-based, free, no installs, no signups.
3 minReadDuplicate a page in a PDF
Page duplication — copy a page within a PDF for templates, repeated forms, or comparative layouts.
3 minReadExtract a single page from a PDF
When you need exactly one page from a long PDF, range-split with one page and you're done in fifteen seconds.
3 minReadExtract pages as separate PDFs
Page-level extraction — pick pages, get each as its own file. Useful for routing per-page, building archives, or sending selectively.
3 minReadFix sideways PDF pages
The simple fix for PDF pages that read sideways — rotate them 90° in the right direction and save.
3 minReadFix upside-down PDF pages
Upside-down pages flipped right-side up — one click for 180° rotation, saved into the file.
3 minReadFlatten PDF pages
Flattening locks annotations and form data into the page. The result behaves as a static document.
4 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 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 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 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 minReadRedact account numbers from PDF
Account numbers redacted at every occurrence — find-and-redact patterns for bank, credit card, and ID numbers.
4 minReadRedact confidential PDF
Confidential content removed permanently — for sharing redacted versions of internal documents externally.
4 minReadRedact email addresses from PDF
Bulk email-address redaction — a regex pattern catches every address in one find, then apply redaction in one click.
4 minReadRedact multiple pages at once
When the same content appears on many pages — headers, repeated names, page-level identifiers — redact all instances in one pass.
4 minReadRedact names in PDF
Name redaction across a whole PDF — pattern-based finding plus permanent removal of the underlying text.
4 minReadRedact PDF for court filing
Court filings have strict redaction requirements — permanent removal, not visual masking. Flint meets the standard.
5 minReadRedact PDF keep formatting
Layout-preserving redaction — black marks replace content, but surrounding text doesn't reflow.
4 minReadRedact PDF on Mac
Preview's redaction is unreliable on older macOS versions. Flint in your browser is the safer Mac option.
4 minReadRedact PDF permanently
Permanent redaction means the original content is gone, not hidden. Here's how Flint makes that real.
4 minReadRedact PDF without Acrobat
Acrobat-free PDF redaction — same operation, same standard, none of the subscription.
4 minRead