Guides & tips for working with PDFs
Practical how-tos, behind-the-scenes notes, and product updates from the team behind Blackpdf.
How to Split a PDF Into Multiple Files
Step-by-step guide to splitting a PDF online: by page range or into individual pages. Free, no installation required.
Convert from PDF
Turn PDFs into Word, Excel, PowerPoint, and image files.
How to Edit a PDF (What Actually Works)
PDFs aren't built to be edited. Here's the honest guide to changing one — when to convert to Word, when to edit the pages directly, and when you're using the wrong tool entirely.
How to Convert a PDF to PowerPoint
Convert a PDF to an editable PowerPoint presentation. Step-by-step guide for documents that need to land in slides, plus what survives the conversion.
How-ToHow to Convert a PDF to Excel
Convert a PDF to an editable Excel spreadsheet: extract tables cleanly, handle scanned PDFs, and know which formatting survives. Step-by-step guide.
How-ToHow to Convert a PDF to JPG
Convert PDF pages to JPG, PNG, WebP, or TIFF images. Step-by-step guide with the right quality setting and format for web, print, and archiving.
How-ToHow to Convert a PDF to Word
Convert PDF to editable Word documents: handle scanned PDFs, preserve formatting, and understand what survives the conversion. Step-by-step guide.
Convert to PDF
Turn Word, Excel, PowerPoint, and images into PDFs.
ODT vs RTF vs DOCX: What the Difference Actually Is
Three document formats that all hold the same words. What each one is, why you keep receiving them, and why converting any of them to PDF is usually the right answer.
How to Print an Ebook (EPUB to Paper)
Ebooks aren't built to be printed — they have no fixed pages. Here's how to turn an EPUB into a printable PDF, and how to keep it from wasting a hundred sheets of paper.
How to Convert Code or a Log File to PDF
Turning source code, logs, or config files into a PDF for review, submission, or evidence. Why the font choice makes or breaks it, and how to stop lines wrapping.
How to Convert Any Document to PDF
Word, Excel, PowerPoint, images, HTML, plain text, RTF, ODT, or an EPUB ebook — the right converter for every source format, and what to watch for in each.
How to Convert TXT to PDF
Turn a plain .txt file — or pasted text — into a clean, formatted PDF. Step-by-step, with page size, font, and font-size options, plus tips for code and logs.
How to Convert RTF to PDF
Turn a Rich Text Format (.rtf) file into a clean, universal PDF. Step-by-step, with the quality, comments, and heading-bookmark options explained.
How to Convert ODT to PDF
Turn a LibreOffice / OpenDocument Text (.odt) file into a PDF that looks the same everywhere. Step-by-step, with the quality, comments, and bookmark options explained.
How to Convert EPUB to PDF
Turn an EPUB ebook into a PDF you can print, annotate, or open anywhere. Step-by-step, plus why a reflowable ebook and a fixed PDF page are fundamentally different.
How to Convert an HTML Invoice or Receipt to PDF
Turn an HTML invoice, receipt, or report template into a clean, print-ready PDF. The margin, page-size, and background-graphics settings that make templated documents come out right.
How to Share a Presentation as a PDF (Handouts & Email)
Why a PDF beats a PPTX for sending a deck: it opens everywhere, can't be casually edited, and is far smaller. How to share slides as handouts and keep the file email-friendly.
How to Save a Web Page as a PDF
Two ways to turn a web page into a PDF: your browser's built-in Print to PDF, or converting the page's HTML. When to use each, and how to get a clean, complete capture.
How to Convert PowerPoint to PDF
Turn a PPT or PPTX presentation into a PDF that opens the same for everyone — fonts intact, layout locked, no PowerPoint required. Step-by-step, plus how to keep slides looking right.
How to Convert HTML to PDF
Turn an HTML file or pasted HTML code into a clean PDF. How to set page size, orientation, and margins, whether to keep background graphics, and why CSS sometimes renders differently.
How-ToHow to Convert Excel to PDF
Convert an Excel spreadsheet to PDF: pick the page size, orientation, fit method, and which sheets to include. Step-by-step guide for clean output.
How to Convert an Image to PDF
Convert JPG, PNG, or other images to a PDF document. Step-by-step guide with page size, orientation, multi-image layouts, and page numbering.
How-ToHow to Convert Word to PDF
Convert a Word document to PDF online: keep formatting, hyperlinks, and bookmarks intact. Step-by-step with quality settings and PDF/A export.
Edit & Organize
Compress, merge, split, rotate, resize, and flatten pages.
How to Fix a PDF Form That Won't Print or Display Right
Filled-in form fields that vanish when printed, or look wrong on someone else's screen? Flattening merges them into the page so everyone sees exactly what you see.
How to Merge PDFs in the Right Order
Merged files coming out jumbled? Here's why upload order isn't what you think, how to control the sequence, and the filename trick that makes it automatic.
How to Resize a PDF to A4 (or Letter)
Convert a PDF to A4 or US Letter so it prints and uploads correctly. Why the two sizes aren't interchangeable, and how to force every page to the one you need.
How to Make All PDF Pages the Same Size
One odd page in an otherwise uniform document? Here's how to detect the outliers and normalize just those — without touching the pages that were already correct.
How to Rotate a PDF Without Breaking Your Page Sizes
Rotating a page 90° turns it landscape — which leaves your document with mismatched page widths. Here's what the Maintain page width option does and when you need it.
How to Remove a Page from a PDF
Need to take one page — or a few — out of a PDF? Here's how to remove pages, and when deleting is the wrong move and you should extract the pages you want instead.
How to Fix a Sideways or Upside-Down PDF (Permanently)
Your PDF opens sideways and your reader's rotate button doesn't save it. Here's how to fix the orientation permanently — one page, all pages, or an upside-down scan.
How to Delete Blank Pages from a PDF
Scanners love adding blank pages. Here's how to find and remove them, why a 'blank' page often isn't truly blank, and how to spot the ones that only look empty.
Why Won't My PDF Compress? (And What to Do Instead)
Compressed your PDF and it barely shrank? Here's why some PDFs resist compression, how to diagnose what's actually making yours big, and the fixes that work when compression doesn't.
How to Compress a Scanned PDF (Without Making It Unreadable)
Scanned PDFs are huge because every page is an image. Here's how to shrink one properly — grayscale first, compress second, OCR in the right order — and keep the text legible.
How to Compress a PDF for Email (Attachment Too Large)
Your email bounced because the PDF attachment is too big. Here's how to get under Gmail and Outlook's limits, why the cap is smaller than you think, and when to send a link instead.
How to Split a PDF Into Multiple Files at Once (with Groups)
Split one PDF into several documents in a single pass using color-coded groups. Assign pages to groups, name each one, and export one PDF per group — step by step.
How to Compress a PDF to 5 MB (for Email)
Email bouncing because your PDF is over the 5 MB limit? Here's how to get a PDF under 5 MB while keeping it looking good — usually with the lightest compression.
How to Compress a PDF to 500 KB
Need a PDF under 500 KB for an upload or email? Here's how to hit that target, the quality you can expect at 500 KB, and what to do if it overshoots.
How to Compress a PDF to 1 MB
Need a PDF under 1 MB for email or an upload? Here's how to hit 1 MB while keeping the document looking good, and what to do if it lands over.
How to Compress a PDF to 100 KB
Need a PDF under 100 KB for a form or upload with a tight size cap? Here's how to hit that target, what quality to expect at 100 KB, and what to do when the file won't go that low.
How-ToHow to Flatten a PDF (And When You Actually Need To)
Flatten a PDF to bake annotations, form fields, signatures, and layers into the page. Step-by-step guide, plus when flattening is required and when it isn't.
How-ToHow to Rotate a PDF (Fix Sideways Pages)
Rotate pages in a PDF document: all pages at once, just the sideways ones, or one page at a time. Step-by-step guide with the permanent-rotation gotcha.
How-ToHow to Resize PDF Pages to a Uniform Size
Fix a PDF with uneven page sizes. Resize pages to A4, Letter, Legal, or a custom size, choose how content scales, and normalize only the outliers.
Why a PDF's Pages End Up Different Sizes (and How Page Boxes Work)
A PDF stores a size on every page, not one for the whole file. Here's why pages drift apart, what MediaBox and CropBox actually do, and how to make them match.
How-ToHow to Delete Pages from a PDF
Remove blank pages, covers, or anything else you don't want from a PDF. Step-by-step guide with bulk selection and tips for large documents.
How-ToHow to Merge PDFs Into One File
How to merge PDFs into a single document: drag, reorder, combine. Includes page-level merging and what to do for password-protected or large files.
How-ToHow to Split a PDF Into Multiple Files
Step-by-step guide to splitting a PDF online: by page range or into individual pages. Free, no installation required.
How-ToHow to Compress a PDF Without Losing Quality
Compress a PDF online without losing quality. Step-by-step guide to preset levels, custom target file sizes, and flatten-then-compress for stubborn files.
Security
Protect, unlock, redact, and sign PDFs.
How to Password-Protect a PDF Before Emailing It
Sending something confidential by email? Here's how to encrypt the PDF first — and the step most people get wrong: how to share the password safely.
Why Blacking Out Text in a PDF Doesn't Work
Drawing a black box over sensitive text hides it visually but leaves the data in the file — anyone can copy it straight out. Here's why, and what actually removes it.
How to Remove Personal Information (PII) from a PDF
Strip emails, phone numbers, SSNs, card numbers, dates, and IP addresses from a document before you share it — using auto-detection to catch what you'd miss by eye.
How to Create an Electronic Signature You Can Reuse
Make a signature once — drawn, typed, or uploaded — save it, and reuse it on every document instead of re-signing from scratch each time.
How to Add a Stamp to a PDF
Add a company seal, an APPROVED mark, or a logo to a PDF. How stamps differ from signatures and watermarks, and when each is the right tool.
How to Stop a PDF From Being Copied or Printed
Want to share a PDF but not let people print it or copy the text out? Here's how to switch off printing and copying with permission restrictions — and what that does and doesn't prevent.
How to Restrict a PDF (Block Printing, Copying & Editing)
Stop people printing, copying, or editing your PDF without locking them out of it. How PDF permission restrictions work, the six controls you can set, and where they help — and don't.
How to Remove Restrictions from a PDF
Got a PDF you can open but can't print, copy, or edit? Here's how to remove permission restrictions (and digital signatures) so you can use your own document freely.
How to Enable Printing and Copying on a Restricted PDF
Can't print or copy text from a PDF that opens normally? It's restricted, not locked. Here's how to re-enable printing and copying so you can use the document.
How PDF Encryption Works (And When It's Not Enough)
What PDF passwords actually protect, user vs owner passwords, why older PDFs are crackable, and when you need more than a password.
Digital Signature vs Electronic Signature
Electronic, digital, and e-signature get used interchangeably but they're different. Here's what each term actually means, legally and technically.
How to Redact a PDF (Hide Sensitive Information)
Permanently redact sensitive content from a PDF: manual marking, find-and-redact text search, or auto-detect for emails, phones, and SSNs. Step-by-step guide.
How-ToHow to Unlock a PDF (Remove Password Protection)
Remove password protection from a PDF you have the password for. Step-by-step guide, plus what to do if you've forgotten the password.
How-ToHow to Password-Protect a PDF
Add a password to a PDF so only people with the password can open it. Step-by-step guide, plus how to pick a strong password and what to do if you forget it.
How to Sign a PDF Online
Add a signature to a PDF online: draw it, type it, or upload an image. Step-by-step guide, plus how to lock the signature so it can't be moved.
Advanced
OCR, repair, compare, grayscale, enhance scans, and PDF/A.
How to Find Changes Between Two Versions of a Document
Someone sent back a 'lightly edited' contract and you need to find every change. Here's how to compare two PDF versions and catch the edits you'd never spot by eye.
How to OCR a PDF in Another Language
OCR fails badly when it's set to the wrong language. Here's why the setting matters so much, which languages are supported, and what to do with a multilingual document.
How to Extract Text from a Scanned PDF
Can't select or copy the text in a PDF? It's a scan — an image of words, not words. Here's how OCR turns it into text you can search, copy, and edit.
How to Enhance a Faded or Low-Contrast Document
Old receipts, faded carbon copies, and pale pencil notes scan badly. Here's how to bring the text back without the whitening step erasing the very content you're trying to save.
How to Clean Up a Scan Before OCR (For Better Accuracy)
OCR accuracy depends almost entirely on the quality of the image you feed it. Here's how to prepare a scan so the text recognition actually works — and the order that matters.
How to Enhance a Whole Batch of Scanned PDFs
Cleaning up a stack of scans one at a time is a waste of an afternoon. Here's how to process them together — and when a single set of settings works for all of them.
"PDF Version Not Supported" — How to Fix a Rejected Upload
An upload portal rejected your PDF over its version number. Here's what that means, why it happens, and how to fix it in seconds without touching your document's content.
How to Make a PDF Open in Older Software and Printers
A PDF that won't open on an old reader, or crashes a print shop's machine, is often a version problem. Here's how downgrading fixes it without touching your content.
How to Convert a PDF to PDF/A
Convert a PDF into an archival PDF/A file. How to choose between PDF/A-1, 2, and 3, what the a/b/u conformance letters mean, and which colour profile to pick.
How to Automate Repetitive PDF Tasks with Workflows
Chain PDF operations into a saved workflow — unlock, OCR, compress, watermark, number — and run the whole sequence on new files in one click instead of repeating it by hand.
How to Remove a Shadow from a Scanned PDF
Got a shadow or grey gradient across a scanned page? Here's why it happens, how to remove it with the Whiten Background control, and how to keep faint content from disappearing too.
How to Scan a Document with Your Phone (and Make It Look Like a Real Scan)
Your phone is a scanner — if you shoot and clean up the photo the right way. The full workflow: capture, straighten, enhance to a flat white background, OCR, and combine into one PDF.
How-ToHow to Enhance a Scanned PDF (Clean Up Photos of Documents)
Turn a phone photo or a grey, shadowed scan into a clean PDF with a flat white background. How the Whiten, Exposure, Contrast, and Sharpness controls work, and when to use each.
How-ToHow to Convert a PDF to Grayscale (Black & White)
Turn a colour PDF black and white for cheaper printing and smaller files. The four grayscale modes, what DPI to pick, and when grayscale beats compression.
How-ToHow to Repair a Corrupted PDF
Fix a PDF that won't open, shows errors, or displays blank pages. Step-by-step guide for diagnosing damage and recovering as much as possible.
How to Compare Two PDFs and Spot the Differences
Compare two versions of a PDF side by side, as an overlay, or as a highlighted difference view. Step-by-step guide for catching changes between revisions.
PDF Accessibility Explained: Tagged PDFs and PDF/UA
Why some PDFs work with screen readers and others don't, what tagged PDFs are, how PDF/UA differs from PDF/A, and what makes a PDF legally accessible.
How-ToHow to OCR a PDF (Make Scans Searchable)
Run OCR on a scanned PDF to make the text searchable, copyable, and screen-reader friendly. Step-by-step, plus how to pick the right language.
PDF Versions Explained: What 1.4, 1.7, and 2.0 Actually Mean
Every PDF carries a version number in its header — 1.3, 1.4, 1.7, 2.0. Here's what each version adds, which one a system will accept, and when to change it.
How to Change a PDF's Version (1.3, 1.4, 1.7, 2.0)
Step-by-step guide to changing a PDF's version header — when you need to, which target to pick, and how the lossless rewrite works.
GuidesPDF vs PDF/A: Which One Should You Use?
PDF vs PDF/A explained: what the archival format changes, when courts and regulators require it, and when standard PDF is the better everyday choice.
Organize
Extract, reorder, number, watermark, and crop pages.
How to Save One Page of a PDF as a Separate File
Just need page 7 out of a 60-page document? Here's the fastest way to save a single page — or a handful — as its own PDF, and how to grab many pages as separate files at once.
How to Add a Logo Watermark to a PDF (Brand Your Documents)
Put your company logo on every page of a PDF. How to get a clean transparent image, where to place it, and the opacity that brands without distracting.
How-ToHow to Add a DRAFT or CONFIDENTIAL Watermark to a PDF
Stamp DRAFT, CONFIDENTIAL, or COPY across every page so nobody mistakes a working document for a final one. The opacity, rotation, and tiling settings that make it work.
How to Insert a Blank Page Into a PDF
Add an empty page anywhere in a PDF — for double-sided printing, section breaks, or a notes page. Step-by-step, plus the page-size detail worth knowing first.
How to Add Pages to a PDF
Insert pages from another PDF at any position in your document — not just at the end. How the gap-click insert works, and when to use it instead of merging.
How to Remove White Margins from a PDF (Auto Crop)
Trim the wasted white space around your PDF's content automatically. How Auto Crop detects content bounds — per page — and when to reach for it instead of manual margins.
How to Crop Only Certain Pages of a PDF
Need to crop one page, or a few — not the whole document? Here's how to target specific pages with a custom range, and what happens when pages end up different sizes.
How to Crop a PDF for Kindle and Tablets (Bigger Text, Less Squinting)
PDFs are painful to read on a small screen because the margins waste it. Cropping the white space makes the text render larger — here's how to do it properly.
How to Skip the Cover Page When Adding Page Numbers to a PDF
Don't want a number on your cover or contents page? Here's how Start from Page and Start Numbering at work together so numbering begins on the right page — with the right number.
How to Add Roman Numerals to a PDF (i, ii, iii)
Number front matter with Roman numerals and the body with Arabic numbers, the way books do. How to do it in two passes, and when lowercase vs uppercase is right.
How to Add "Page 1 of 10" to a PDF
Add page numbers that show the total too — Page 1 of 10, 1/10, or 1 - 10. Which format to pick, why it matters for printed documents, and how the total is counted.
How to Extract Meesho Tax Invoices (Supplier Panel PDFs)
Meesho's supplier panel bundles the GST tax block with the shipping label on one PDF. Here's how to auto-extract just the Meesho tax invoices in bulk for your records.
How to Extract Flipkart Tax Invoices (Seller Portal PDFs)
Flipkart's seller portal bundles the GST tax invoice with the shipping label on one PDF. Here's how to auto-extract just the Flipkart tax invoices in bulk for your records.
How to Extract Amazon Tax Invoices (Seller Central PDFs)
Amazon Seller Central bundles a Tax Invoice / Bill of Supply with the shipping label on one PDF. Here's how to auto-extract just the Amazon tax invoices in bulk for GST records.
How to Auto-Crop Tax Invoices from E-commerce PDFs
E-commerce order PDFs bundle a shipping label with a GST tax invoice. Here's how to auto-extract just the tax invoices in bulk from Flipkart, Amazon, and Meesho downloads.
How to Crop Meesho Shipping Labels (Supplier Panel PDFs)
Meesho's supplier panel bundles the shipping label with a tax invoice on one PDF. Here's how to auto-crop just the Meesho labels in bulk and print them on a 4×6 thermal printer.
How to Crop Flipkart Shipping Labels (Seller Portal PDFs)
Flipkart's seller portal puts the shipping label and tax invoice on one PDF. Here's how to auto-crop just the Flipkart labels in bulk and print them on a 4×6 thermal printer.
How to Crop Amazon Shipping Labels (Seller Central PDFs)
Amazon Seller Central ships the label and a tax invoice on one PDF. Here's how to auto-crop just the Amazon shipping labels in bulk and print them on a 4×6 thermal printer.
How to Auto-Crop Shipping Labels from E-commerce PDFs
Flipkart, Amazon, and Meesho ship a label and a tax invoice on the same PDF. Here's how to auto-crop just the labels in bulk and print them on a 4×6 thermal or A4 printer.
How-ToHow to Rearrange and Organize PDF Pages
Reorder, rotate, delete, and insert PDF pages from one drag-and-drop view. How to sort pages, fix a scanned-out-of-order document, and when to organize vs. merge or split.
How-ToHow to Crop a PDF (Trim Margins or Adjust Pages)
Crop margins from a PDF or trim pages to a specific area. Step-by-step guide with auto-crop, precise margin values, and per-page versus whole-document crops.
How-ToHow to Add Page Numbers to a PDF
Add page numbers to a PDF: pick the format, position, font, and starting number. Step-by-step guide for documents that need a clean numbering scheme.
How to Extract Pages from a PDF
Pull specific pages out of a PDF as a new file. Step-by-step guide for extracting one page, a range, or every page individually.
How to Add a Watermark to a PDF
Add a text or image watermark to a PDF: presets like Confidential and Draft, custom text, opacity, rotation, and position. Step-by-step guide.
Delete, Extract, or Split a PDF? When Each One Is the Right Tool
Three tools, three different goals: delete the pages you don't want, extract the ones you do, or split a file into multiple PDFs. Here's how to pick the right one.
News & Product Updates
Company news, security and trust, and what’s new on Blackpdf.
Introducing Groups: Split a PDF Into Many Files in One Pass
Split PDF now has Groups — mark pages into color-coded groups and export one named PDF per group in a single step, instead of splitting one file at a time.
Is Blackpdf Safe? How We Handle Your Files and Data
A straight answer to whether Blackpdf is safe to use: how your files are processed, what happens to them after, how we encrypt data, and how payments are handled.