Guides for PDFs, images & file conversion

How to Convert HEIC to JPG on iPhone (Without Losing Quality)

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If you've ever tried to send an iPhone photo to a Windows PC, upload it to an older website, or open it in an app that just refuses to load it, you've run into HEIC. Since iOS 11, iPhones save photos in HEIC (High Efficiency Image Container) by default instead of the older, more universal JPG format.

Why HEIC causes problems

HEIC compresses photos to roughly half the file size of an equivalent JPG at the same visual quality — great for saving storage on your phone, but it's a newer format that plenty of software, older Android phones, and some websites still don't recognize.

Three ways to convert HEIC to JPG

1. Change it going forward: On iPhone, go to Settings → Camera → Formats → and select "Most Compatible." New photos will save as JPG automatically, but this won't touch photos you've already taken.
2. Convert on export: When you AirDrop or email a HEIC photo to a non-Apple device, iOS usually converts it to JPG automatically. This doesn't work for every sharing method, though.
3. Convert existing files directly: For photos already on your device or computer, run them through a converter that decodes HEIC and re-encodes it as JPG, preserving resolution and quality.

The third option is the most reliable when you need control over multiple files at once, or when you're not on an Apple device at all.

How to Convert Images to PDF for Free

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Turning photos or scanned pages into a PDF is one of the most common file tasks there is — for job applications, forms, receipts, portfolios, or just archiving something so it can't be accidentally edited.

Why PDF instead of keeping images as-is

• A PDF keeps multiple pages in one file, in a fixed order — no more attaching a dozen separate JPGs to an email.
• It renders identically on every device, unlike images which can appear rotated or resized depending on the app.
• You can add password protection, which most image formats don't support at all.

Getting a clean result

A few things make a noticeably better output:

1. Upload images in the order you want them to appear — most tools stack pages in upload order.
2. If you're scanning documents with your phone, shoot in good lighting and keep the page as flat and centered in frame as possible.
3. Name the document clearly before generating it — it saves you a rename later.

How to Remove a Password from a PDF Safely

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Password-protected PDFs are useful right up until you forget the password on your own file, or need to share a document with a team where re-typing a password every time gets old. Removing that protection is straightforward — as long as it's your own file, or one you have permission to modify.

Before you unlock anything

Only remove passwords from PDFs you created or have explicit rights to edit. Bypassing protection on someone else's document without permission isn't something any legitimate tool — including ours — is meant to help with.

What actually happens during unlocking

A PDF password unlocker reads the encrypted file, decrypts it using the password you provide, and re-saves a copy without that encryption layer. The content itself — text, images, layout — is untouched; only the lock is removed.

Why doing it in-browser matters

Some online "PDF unlocker" sites upload your file to a server to process it — which means a copy of a potentially sensitive document now lives somewhere you don't control. A tool that runs entirely client-side never sends your file anywhere; the decryption happens locally in your browser tab.

How to Merge Multiple PDFs Into One File

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Whether it's combining scanned receipts for an expense report, stitching together chapters of a document, or assembling a set of invoices for a client, merging PDFs is one of those tasks that comes up constantly and shouldn't require installing any software.

The one thing that trips people up: order

Merge tools combine files in the order you upload or select them — not alphabetically, not by date. If the final document needs to read in a specific sequence, upload the files in that exact order, or rename them with a leading number (01, 02, 03...) beforehand so you can select them correctly.

What merging preserves

A proper PDF merge keeps every page's original text, images, and formatting exactly as-is — it's not re-rendering the pages as flat images, so text stays selectable and searchable, and file size doesn't balloon.

JPG vs PNG vs WEBP vs HEIC: Which Image Format Should You Use?

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Every image format is a different trade-off between file size, quality, and compatibility. Here's the short version of when to reach for each one.

JPG — the universal default

Best for photos. Uses lossy compression, meaning it throws away some detail to shrink the file — usually imperceptible at normal quality settings. Opens absolutely everywhere. Not great for text, logos, or anything with sharp edges, since compression artifacts show up as blurring around hard lines.

PNG — when you need transparency or crisp edges

Lossless, so no quality is lost, but files are noticeably larger than JPG. The right choice for screenshots, logos, graphics with text, or any image that needs a transparent background.

WEBP — the modern all-rounder

Typically produces 25–35% smaller files than JPG at equivalent quality, and supports transparency like PNG. Nearly all modern browsers support it now, making it a strong default for web use — though some older software still doesn't open it.

HEIC — great on Apple devices, painful everywhere else

Apple's default photo format since 2017. Excellent compression, but poor compatibility outside the Apple ecosystem — worth converting to JPG before sharing broadly (see the HEIC to JPG guide above).

Quick decision guide

• Sharing a photo with anyone, anywhere → JPG
• Need a transparent background or crisp text/logo → PNG
• Building a website and want smaller, fast-loading images → WEBP
• Taking photos on an iPhone → they'll save as HEIC; convert before sharing outside Apple devices

How OCR Works: Turning Images and Scanned PDFs into Editable Text

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OCR (Optical Character Recognition) is the technology that reads text inside an image — a scanned page, a photo of a receipt, a screenshot — and turns it into actual, selectable, editable text you can copy, search, or paste elsewhere.

What it's actually doing

OCR software analyzes the shapes in an image pixel by pixel, identifies patterns that match known letterforms, and reconstructs them as text characters — essentially teaching a computer to "read" the way a person would glance at a page.

Common everyday uses

• Digitizing a scanned or printed document so it can be edited or searched
• Pulling numbers off a receipt for expense tracking
• Extracting text from a screenshot instead of retyping it
• Making old, image-only PDFs searchable

Getting the most accurate results

1. Good lighting, no glare — shadows and reflections are the most common cause of misread characters.
2. Keep the page flat and straight-on — an angled or curved shot distorts letterforms.
3. Higher resolution helps — a crisp, in-focus image gives OCR far more detail to work with than a blurry, low-res one.
4. Plain backgrounds work best — busy or textured backgrounds behind the text can confuse the recognition.

Modern OCR handles printed text very reliably. Handwriting is a different, harder problem — results vary a lot depending on how neat and consistent the handwriting is.

How to Convert PNG to JPG (and When You Shouldn't)

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PNG stores every pixel exactly, which makes photos large. Converting a photographic PNG to JPG often cuts the file size dramatically with little visible change.

Convert when

• The image is a photo or a scan
• You need to fit an upload size limit
• Transparency isn't needed

Keep the PNG when

• It has a transparent background (JPG can't store transparency and will fill it with a solid color)
• It's a logo, screenshot or text-heavy graphic, where JPG blurs sharp edges

Convert a copy, not your only original: JPG is lossy, so re-saving it repeatedly slowly degrades quality.

WEBP to JPG: Why Downloaded Images Won't Open

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Many websites serve images as WEBP because it's smaller than JPG. When you save one, some older editors, email clients and print services refuse to open it.

The fix

Convert the WEBP to JPG (or PNG if it has transparency). The picture looks the same; only the container changes.

Tip

If the image is a logo or graphic with a transparent background, choose PNG so the transparency survives.

What Is AVIF? The Newest Image Format Explained

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AVIF is a modern image format that often produces smaller files than both JPG and WEBP at similar visual quality. Browsers increasingly support it, but plenty of desktop apps and print services do not.

Use AVIF for

• Website images where page speed matters

Avoid AVIF for

• Files you'll email, print or open in older software; convert to JPG or PNG first

Lossy vs Lossless Compression: What You Actually Lose

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Lossless formats like PNG keep every pixel. Lossy formats like JPG and WEBP discard detail your eye is unlikely to notice, in exchange for much smaller files.

The catch: generation loss

Every time you edit and re-save a lossy image, more detail is thrown away. Keep one original, and export copies from it instead of re-saving the same file.

Rule of thumb

• Photos to share: lossy is fine
• Graphics, text and masters you'll edit again: lossless

What Is a TIFF File and Should You Convert It?

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TIFF is a lossless format common in scanning, publishing and professional photography. It preserves quality, but files are very large and many websites and email services won't accept them.

Convert to

• PDF or JPG for sharing and uploads
• PNG if you need lossless quality in a smaller, more compatible file

Keep the TIFF as your archive copy.

BMP Files: Why They're Huge and How to Shrink Them

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BMP stores pixels with little or no compression, so a single image can be many megabytes. Some legacy software and screenshots still produce it.

Converting BMP to PNG keeps the exact quality in a much smaller file, while JPG gives the smallest result for photos.

SVG vs Raster Images: Vector Basics for Everyday Use

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Raster images (JPG, PNG, WEBP) are grids of pixels and blur when enlarged. SVG describes shapes with math, so it stays sharp at any size.

Use SVG for

• Logos, icons and simple illustrations

Use raster for

• Photos and complex images

If a platform won't accept SVG, converting it to PNG at a large size is the usual workaround.

Image Resolution Explained: Pixels, DPI and Print Size

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Resolution is simply how many pixels an image contains. DPI only describes how densely those pixels are printed, so it means nothing until you choose a print size.

Quick math

Pixels ÷ DPI = inches. A 3000 px wide photo prints about 10 inches wide at 300 DPI.

For screens

Only the pixel dimensions matter. Changing the DPI number in a file doesn't make it sharper.

How to Batch Convert a Folder of Photos at Once

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Converting files one by one is slow. Select the whole set, choose one target format, and process them together.

Before you start

• Sort out which files need converting, since JPGs going to PDF don't need it
• Pick the format for the destination: JPG for sharing, PNG for graphics, WEBP for websites
• Keep the originals until you've checked the results

Opening iPhone Photos on Windows Without Extra Apps

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iPhone photos use HEIC. Windows often shows blank thumbnails or asks for a codec, and many apps can't open them.

Fastest fix

Convert the HEIC files to JPG on your computer, then open or share them anywhere.

Prevent it

On iPhone, Settings → Camera → Formats → Most Compatible saves future photos as JPG.

How to Scan Documents to PDF With Just Your Phone

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You don't need a scanner. A phone camera and a few habits give clean results.

Shooting tips

• Use daylight or an even light and avoid shadows from your hand
• Place the page on a dark, plain surface and shoot straight down
• Fill the frame but keep all four corners visible

Then

Combine the photos, in page order, into one PDF.

A4 vs US Letter: Choosing the Right PDF Page Size

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A4 (210 × 297 mm) is standard in most of the world. US Letter (8.5 × 11 in) is used in the US and Canada. They're close but not identical, which is why margins shift when a file crosses borders.

Rule

Choose the size used where the document will be printed or submitted. For forms and applications, follow whatever the recipient specifies.

Open Password vs Permissions Password in PDFs

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PDFs can carry two different protections.

Open (user) password

The file can't be read at all until you enter it. You need the correct password to unlock it.

Permissions (owner) password

The file opens freely but restricts things like printing or copying.

Unlock only files you own or are allowed to modify. If you've forgotten an open password, no tool can honestly recover it for you.

Why You Should Send Your CV as a PDF

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A Word file can reflow when opened on another device. A PDF looks identical everywhere, which is why most recruiters prefer it.

Checklist

• Name it clearly, such as Firstname-Lastname-CV.pdf
• Keep it to a sensible size for email and upload forms
• Make sure text is selectable, since some systems read PDFs automatically; scans of a printed CV often aren't

Combine Receipts Into One PDF for Expense Reports

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Finance teams like one file per report. Convert phone photos of receipts to PDF first, then merge them.

Steps

• Turn each receipt photo into a PDF
• Merge them in date order
• Name the file with the month and your name

Check the merged file page by page before sending.

File Naming Tips That Make PDFs Easy to Find Later

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Good names sort themselves. Start with the date as YYYY-MM-DD, then a short description.

• 2026-03-14-electricity-bill.pdf
• Avoid spaces and special characters if the file will be uploaded to websites
• Number files 01, 02, 03 before merging so they combine in the right order

Extract Text From Receipts With OCR

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Receipts are small, faded and crumpled, which makes them tricky for OCR.

For best results

• Flatten the receipt and shoot in bright, even light
• Fill the frame so the text is large
• Always double-check amounts and dates in the output, since one misread digit changes a total

Copy Text From Screenshots and Images

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Screenshots, photos of slides and image-only PDFs contain no real text, so you can't select or search them. OCR reads the picture and gives you text you can copy.

Crop to the text area first and use the highest-resolution version you have.

Can OCR Read Handwriting? Realistic Expectations

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OCR is tuned for printed characters. Handwriting varies from person to person, so accuracy drops, sometimes sharply.

Improve your odds

• Use dark ink on plain white paper
• Write in clear, separated block letters
• Expect to proofread everything

QR Code Best Practices: Size, Contrast and Testing

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A QR code that won't scan is worse than none.

Checklist

• Dark code on a light background, with high contrast
• Leave a blank margin (quiet zone) around it
• Don't stretch it; keep it square
• Test with more than one phone before printing
• Keep the linked address short, since shorter data makes a simpler, easier-to-scan code

What Size Should a Printed QR Code Be?

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A common rule is to make the code at least 1 in / 2.5 cm wide for close-range scanning, and larger the farther away people will scan from.

Rough guide

• Business card: about 2 cm and up
• Flyer: 3 to 4 cm
• Poster: scale up with viewing distance

Always print a test copy and scan it from the real distance.

Are QR Codes Safe? How to Scan Without Getting Tricked

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A QR code is only a shortcut to a web address, but that address can be malicious.

Stay safe

• Look at the link your phone shows before you open it
• Be wary of codes stuck on top of other codes in public places
• Never enter passwords or payment details after scanning something unexpected

Browser-Based vs Upload-Based File Converters

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Some converters upload your file to a server. Browser-based tools process it on your own device in the page.

Why it matters

• Contracts, IDs and financial documents shouldn't be copied to third-party servers unnecessarily
• Local processing also works faster on slow connections, since nothing needs to upload

Ask any tool

Does it say where processing happens, and does it delete files afterward?

What Is Photo Metadata (EXIF) and Should You Remove It?

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Phone photos often embed metadata: capture time, camera model and sometimes GPS coordinates.

Before posting publicly

• Check your camera's location settings
• Remember that screenshots typically carry less metadata than original photos
• Social platforms may strip metadata, but not every site or messenger does

When sharing photos of your home, consider whether location data is included.

Safer Ways to Share Sensitive Documents

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Sensitive files deserve care.

• Send the minimum: one needed page instead of the whole file
• Use a password on the file or a protected link, and share the password through a different channel
• Delete copies from downloads folders when done

Remove a password only from files you own, and only when you no longer need the protection.

How to Compress an Image Without Ruining It

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Big photos hit upload limits fast. Compression shrinks them by removing detail you're unlikely to notice.

What helps most

• Use JPG or WEBP for photos, since PNG stays large
• Lower quality gradually and compare, because most photos look fine well below maximum
• Reduce pixel dimensions too if the image will only be viewed on screen

Keep your original

Compression is lossy. Always export a smaller copy and keep the untouched file.

How to Make a PDF Small Enough to Email

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Scanned pages and embedded photos are the usual reason a PDF is large. Text alone is tiny.

Before you compress

• Check the limit: mail providers commonly cap attachments at around 20 to 25 MB, so verify yours
• Choose the lightest compression that gets under the limit

What to expect

This kind of compressor re-renders each page at a lower resolution, so the pages become images and the text may no longer be selectable. Keep your original file, and zoom in on the result to check small print is still readable.

How to Resize Many Images at Once

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Resizing one by one wastes time. Set the exact pixel size once, apply it to the whole batch, then spot-check a few results.

Pick the right mode

• Fit: the whole image stays visible, with the original proportions
• Cover: fills the frame exactly and crops the edges
• Stretch: forces the size and distorts the picture, so avoid it for photos

Tips

Never enlarge a small image, since it just gets blurry, and resize from the original.

How to Extract Pages From a PDF as Images

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Sending a 60-page file when the recipient needs pages 4 to 6 is slow and can share more than you meant to.

How it works

A page extractor saves the pages you choose as image files. You can enter single pages and ranges, such as 1,3,5-8.

Good habits

• Note the page numbers first
• Open the results to confirm the right pages came out
• Need them back as one PDF? Combine the images with an image-to-PDF tool

How to Get a Color Palette From Any Image

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A color palette extractor finds the dominant colors in a picture, so you can reuse them in a presentation, website or logo.

Getting a useful palette

• Use a clear image with a few strong colors
• Pick 3 to 5 colors instead of every shade
• Check text contrast: light text on a light color is hard to read

Image to Base64: What It Is and When to Use It

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Base64 turns an image into a long string of text, so it can live inside HTML, CSS or JSON instead of a separate file.

Good for

• Tiny icons and small inline images

Not good for

• Large photos, because Base64 makes data roughly a third bigger and can't be cached like a normal image file

Why Email Rejects Your Attachment (and What to Do)

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Email services limit attachment size, and the total counts all files together plus encoding overhead. A file just under the limit can still bounce.

Fixes

• Compress large PDFs and photos
• Send fewer files per message
• Share a link to a cloud file when it's still too big

Faster Websites Start With Smaller Images

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Large images slow pages down, especially on mobile connections.

Checklist

• Serve photos as WEBP or JPG
• Resize to the largest size the page really displays
• Compress before uploading
• Give every image a short description for accessibility

Image Dimensions, Megapixels and File Type Explained

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Every image has a few basic properties worth knowing.

The basics

• Dimensions: width and height in pixels
• Megapixels: width × height ÷ 1,000,000, so 4000 × 3000 is 12 MP
• Aspect ratio: the shape, such as 4:3 or 16:9
• MIME type: the file kind, such as image/jpeg or image/png

Why check

Dimensions tell you if an image is big enough to print or use as a banner, and the file type tells you what will open it.

Aspect Ratios: 1:1, 4:3, 3:2 and 16:9 Explained

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Aspect ratio is width compared with height. Square is 1:1, most phone photos are 4:3, many cameras use 3:2, and screens and video use 16:9.

Why images get cropped

When a photo is placed in a frame of a different shape, something has to give: the edges are cropped, or empty bars appear.

Plan ahead

Leave some space around the subject when shooting, so a crop to a different ratio won't cut off anything important.

HEX vs RGB Color Codes: What's the Difference?

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RGB describes a color as three numbers from 0 to 255 for red, green and blue. HEX writes the same values in base 16, like #4A63F0.

Which to use

• Web design and CSS: either works, HEX is shorter
• Design apps: use whatever the app shows

They're interchangeable, so copy a color once and paste it wherever it's needed.

RGB vs CMYK: Why Printed Colors Look Different

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Screens mix light (red, green, blue), so they can show very bright, vivid colors. Printers mix ink (cyan, magenta, yellow, black), which covers a smaller range.

What that means

• Bright neon blues and greens often look duller in print
• For professional printing, ask the printer which color mode they want
• Do a small test print before a big order

Why GIFs Are Still Around (and When to Skip Them)

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GIF supports simple animation and works almost everywhere, which is why it survives. But it's limited to 256 colors per frame, so photos look grainy and files get big.

Use GIF for

• Short, simple loops and small graphics

Use something else for

• Photos and long clips, where video formats are far smaller and sharper

Scanned PDF or Text PDF? How to Tell in 5 Seconds

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Open the PDF and try to select a sentence, or search for a word you can see. If it works, the file contains real text. If you can only drag a box over the page, it's a picture of text, which is what a scan produces.

What to do

Run a scanned PDF through OCR to get text you can copy and search.

What Is a Searchable PDF? OCR Text Layers Explained

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A scanned page is just an image. OCR recognizes the letters in it, and a searchable PDF stores that recognized text invisibly behind the image.

Why it matters

• You can search and copy text from the document
• Screen readers can read it
• The page still looks exactly like the original scan

Accuracy depends on the scan quality, so check important names and numbers.

PDF vs Word: Which Should You Send?

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A PDF keeps layout fixed, so it looks the same on every device. A Word file is built for editing, and can shift when fonts or software differ.

Simple rule

• Final version, application or invoice: PDF
• Draft the other person will change: Word

When unsure, send the PDF and offer the editable version if they ask.

What Is PDF/A? Long-Term Archiving in Plain English

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PDF/A is a standard for archival PDFs. It aims to make a file display the same years later by limiting features that could break over time, such as depending on outside resources.

When it comes up

• Some offices, courts or archives ask for it
• If a recipient requires PDF/A, check their instructions, since not every PDF qualifies

Making PDFs Easier to Read for Everyone

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Accessible documents help everyone, including people using screen readers.

Basics

• Use real text, not scans of text
• Use clear headings and a logical reading order
• Add descriptions to important images
• Use strong contrast and readable font sizes

If you have only an image-based scan, OCR is the first step to make its text usable.

How to Choose a Strong Password for a PDF

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A long password beats a short complicated one.

Guidelines

• Use a passphrase of several unrelated words
• Don't reuse a password from another account
• Store it in a password manager
• Send the password through a different channel than the file

Remember: if you forget an open password, the file may be unrecoverable.

Putting a QR Code on Your Business Card

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A QR code can send people straight to your portfolio or contact page.

Do

• Link to a page you control, since a printed code can't be edited later
• Keep it around 2 cm or larger, with plain space around it
• Test it on several phones before printing

Don't

• Link to something temporary that may disappear

Short Links Make Simpler QR Codes

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The longer the web address, the denser and more detailed the QR code becomes, and dense codes are harder to scan at small sizes.

Tips

• Use a short address on a domain you control
• Be careful with third-party link shorteners, since they may change or expire
• Always test the finished code

QR Codes vs Barcodes: What's the Difference?

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Traditional barcodes are one-dimensional lines that store a short number, such as a product code. QR codes are two-dimensional squares that can hold much more, like web addresses or text.

Practical difference

Any phone camera can read a QR code, while barcodes are typically read by dedicated scanners or shop apps.

How to Spot a Risky Email Attachment

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Attachments are a common way scams spread.

Red flags

• You weren't expecting the file, even from a familiar name
• Urgent language pushing you to open it now
• Odd file types or names like invoice.pdf.exe
• A request to enable macros or editing

Safer habit

Confirm with the sender through another channel before opening anything unexpected.

Handling Documents on Public Wi-Fi

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Public networks are shared with strangers, so treat them cautiously.

• Avoid opening or sending sensitive documents when you can wait
• Prefer secure (https) sites, and log out when done
• Use your phone's mobile connection for anything sensitive
• Keep your device updated

The 3-2-1 Rule for Backing Up Photos and Files

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Keep 3 copies of anything important, on 2 different types of storage, with 1 copy somewhere else, such as cloud storage or another location.

Why it works

A single drive can fail, get lost or be stolen. Multiple independent copies make losing everything very unlikely.

Check occasionally that you can actually open your backups.