Guides
Real walkthroughs for real PDF tasks
Step-by-step guides for converting, editing, signing, and organising PDFs — written for people who just want the job done. Every guide ends with a direct link into the Flint tool that does the work.
32 guides and counting.
Convert
Move documents between PDF and every other format.
- DOCXPDF
How to convert a Word document to PDF
The fastest way to turn Word documents into clean, shareable PDFs — fonts embedded, layout preserved, browser-based.
4 min readRead guide - XLSXPDF
How to convert Excel to PDF
Turn a spreadsheet into a shareable PDF — page breaks, print areas, and freeze panes respected.
4 min readRead guide - PPTXPDF
How to convert PowerPoint to PDF
Distribute decks the right way — PDF preserves fonts, kills animations, locks layout.
4 min readRead guide - JPG / PNGPDF
How to convert an image to PDF
Stitch images into a single PDF — receipts, scanned pages, photos. Drag to reorder before export.
3 min readRead guide - PDFDOCX
How to convert PDF to Word
Get an editable .docx out of any PDF — text, tables, and images preserved. OCR runs automatically on scans.
4 min readRead guide - PDFXLSX
How to convert PDF to Excel
Pull tables out of PDFs and into a spreadsheet you can actually sum, sort, and filter.
4 min readRead guide - PDFPPTX
How to convert PDF to PowerPoint
Reopen a sent-as-PDF deck as an editable .pptx — useful for rebrands and template reuse.
4 min readRead guide - PDFJPG
How to convert PDF to JPG
Rasterise each PDF page into a JPG — perfect for social, thumbnails, and chat attachments.
3 min readRead guide - PDFPNG
How to convert PDF to PNG
Lossless image export from PDF — best for text-heavy pages and anything you'll re-edit.
3 min readRead guide - PDFEPUB
How to convert PDF to EPUB
Reflowable EPUB output — the right format when you want to read a PDF on an e-reader, not just open it.
4 min readRead guide
Edit & sign
Mark up, edit text, sign — without leaving the browser.
- Sign PDF
How to electronically sign a PDF
Sign any PDF in your browser in 90 seconds — legally valid under ESIGN, UETA, and eIDAS.
5 min readRead guide - Sign PDF
How to add a digital signature to a PDF
Add a defensible digital signature to a PDF — what the term means, what Flint produces, and where PKI tools fit.
6 min readRead guide - Sign PDF
Free DocuSign alternative for signing PDFs
DocuSign at a fraction of the cost — flat-rate signing, multi-party, audit trail. Where it wins, where DocuSign does.
6 min readRead guide - Sign PDF
How to add a signature to a PDF
The simplest way to sign a PDF — draw with your finger, type your name, or upload a signature PNG.
4 min readRead guide - Edit PDF
How to edit a PDF online
Every PDF edit in one browser tab — text, pages, annotations, signatures. No install required.
5 min readRead guide - Edit PDF
How to edit text in a PDF
Click a line, type the replacement, download. Flint matches the original font where possible.
5 min readRead guide - Edit PDF
How to change text in a PDF
Change a date, swap a name, fix a typo — without rebuilding the document.
5 min readRead guide - Edit PDF
How to edit a PDF for free
An honest look at every free PDF editing option, including where Flint costs money and where it doesn't.
5 min readRead guide - Annotate PDF
How to annotate a PDF
Mark up any PDF — boxes, arrows, highlights, freehand ink, sticky notes — without leaving the browser.
5 min readRead guide - Highlight PDF
How to highlight text in a PDF
Drag across text to highlight — same gesture as a paper highlighter, with colour systems for organised review.
4 min readRead guide - Annotate PDF
How to add comments to a PDF
Add sticky notes and callouts to any PDF — the right shape for review cycles where comments need to travel with the file.
4 min readRead guide
Organize
Merge, split, reorder, and trim.
- Compress PDF
How to compress a PDF
How PDF compression actually works, what to expect, and how to pick the right quality tier.
5 min readRead guide - Compress PDF
How to make a PDF smaller
Plain-language guide to shrinking a PDF — including when to split instead of compress.
4 min readRead guide - Compress PDF
How to reduce PDF file size
Pick the right compression tier — DPI, JPEG quality, font subsetting — and know what each level sacrifices.
6 min readRead guide How to merge PDFs
Stitch multiple PDFs into one — drag to reorder, drop in the result.
4 min readRead guideHow to split a PDF
Three ways to split a PDF — by range, by N-pages, or individual page extraction.
4 min readRead guide- Reorder PDF
How to reorder PDF pages
Drag thumbnails to rearrange — fix scanner order, restructure a report, move an appendix to the back.
3 min readRead guide - Rotate PDF
How to rotate PDF pages
Click a page to cycle through 90/180/270, or rotate every page at once. Visual editor with thumbnails.
3 min readRead guide - Delete PDF
How to delete pages from a PDF
Multi-select pages and remove them — blank scanner pages, outdated sections, whole chapters.
3 min readRead guide
Secure & share
Protect, unlock, redact, and share with confidence.
- Redact PDF
How to redact a PDF
Real redaction removes the underlying bytes — not just covers them. Critical for anything going to a third party.
5 min readRead guide - Protect PDF
How to password protect a PDF
Encrypt a PDF with AES-256 — practical password choice, user vs owner permissions, how to share the key safely.
5 min readRead guide - Unlock PDF
How to unlock a PDF
Remove the password from a PDF you have the key to — for documents you own, not bypassing protection.
4 min readRead guide