Guides & Tutorials
The PixelResize Blog
Practical, up-to-date guides on image tools, file formats and SEO for 2026.
Does Duplicating PDF Pages Increase File Size?
Duplicating PDF pages is useful, but it can increase file size. Here's why it happens and how to keep your PDF as small as possible.
Read the full guideWhy Is My PDF So Large?
A PDF that's too large can be difficult to email or upload. Here's why it happens and how you can fix it in just a few minutes.
Read the full guideInstagram Story Size: What Dimensions Actually Work in 2026
Get your Story dimensions right the first time — no more guessing why your image looks cropped or stretched once it's posted.
Read the full guideFacebook Post Image Size: The Dimensions That Actually Display Well
Facebook resizes almost everything you upload. Here's the sizing that keeps your images sharp and uncropped in the feed.
Read the full guideX (Twitter) Post Image Size: The Dimensions That Look Sharp
X crops timeline images to a fixed ratio no matter what you upload. Here's the size that keeps your image intact.
Read the full guideLinkedIn Post Image Size: What Actually Displays Well
LinkedIn's feed is unforgiving about low-resolution or oddly-shaped images. Here's the sizing that keeps posts looking professional.
Read the full guideLinkedIn Cover Photo Size: The Dimensions That Won't Get Cropped
Your LinkedIn banner shows differently on desktop and mobile. Here's the size and layout that works on both.
Read the full guideYouTube Banner Size: The Dimensions and Safe Area You Need
Your YouTube banner has to work on phones, tablets, desktop and TV all at once. Here's the size and safe zone that makes that possible.
Read the full guideWhatsApp DP Size: Getting Your Profile Photo Sharp and Uncropped
WhatsApp forces every profile photo into a circle. Here's the size and framing that keeps faces from getting cut off.
Read the full guidePassport Photo Size: The Exact Dimensions You Need
Passport photo rejections almost always come down to wrong dimensions or background. Here's how to get it right the first time.
Read the full guideUPSC Photo Size: Exact Dimensions and File Size Limits
UPSC application forms reject photos for very specific technical reasons. Here's exactly what's required and how to hit it.
Read the full guideVisa Photo Size: US, Schengen and Other Common Requirements
Visa photo rules are similar to passport photos but not identical. Here's exactly where they differ.
Read the full guideHow to Compress an Image to Exactly 20KB
20KB is a tight limit that usually comes from a government or exam portal. Here's how to hit it without guessing.
Read the full guideHow to Compress an Image to Exactly 50KB
50KB gives you a bit more room than the strictest limits — here's how to use that room well.
Read the full guideHow to Compress an Image to Exactly 100KB
100KB is a common limit for document photo uploads. Here's how to hit it cleanly on the first try.
Read the full guideHow to Compress an Image to Exactly 200KB
200KB is roomy enough for most document photos to stay sharp. Here's how to hit the number without repeated guessing.
Read the full guideHow to Compress an Image to Exactly 500KB
500KB is generous enough to keep almost any photo looking sharp. Here's how to get there quickly and cleanly.
Read the full guideHow to Compress an Image to Exactly 1MB
1MB gives you plenty of headroom for a sharp photo. Here's how to hit that number without any visible compromise.
Read the full guideHow to Invert Image Colors — and When It's Actually Useful
Inverting colours isn't just an art-class trick. It rescues scanned film, flips diagrams for dark mode, and reveals hidden detail — here's how and when to use it.
Read the full guideHow to Give Your Photos a Warm, Vintage Sepia Look
Sepia is more than a brown filter — it's a specific warm tone with a long history. Here's when it works, when it doesn't, and how to apply it well.
Read the full guideHow to Pixelate an Image to Hide Faces and Sensitive Details
Pixelation is the go-to way to censor a face or a licence plate — but only if you use big enough blocks. Here's how to do it safely.
Read the full guideHow to Round the Corners of an Image and Keep Them Transparent
Rounded corners look modern everywhere — but only if the corners are actually transparent. Here's how to do it right and avoid white boxes.
Read the full guideHow to Rotate a PDF (So It Stays Rotated)
Rotating a PDF in a viewer often doesn't save. Here's how to rotate one page or the whole document so it stays the right way up everywhere.
Read the full guideHow to Rearrange PDF Pages Into the Right Order
Pages in the wrong order? Here's how to reshuffle a PDF into the sequence you actually want, using a visual page grid.
Read the full guideHow to Extract Specific Pages From a PDF
Need just a few pages out of a long PDF? Here's how to pick exactly the pages you want and save them as a new file.
Read the full guideHow to Duplicate a Page Inside a PDF
Need several copies of the same page? Here's how to duplicate a PDF page as many times as you want and keep everything in one file.
Read the full guideSVG to PNG: Rasterizing Vectors the Right Way
SVG scales forever, but plenty of platforms won't accept it. Here's how to rasterize a vector to a crisp, transparent PNG without ending up with a blurry mess.
Read the full guideHow to Add a Border to an Image
A simple border does more than you'd think — it frames a photo, separates it from the page, and even fits a rectangle into a square feed. Here's how to add one well.
Read the full guideBMP to JPG: Turn Huge Bitmaps Into Small, Shareable Photos
If your BMP is a photograph, JPG can cut its size by 90%+ while looking virtually identical. Here's when to make that trade and how to do it well.
Read the full guideHow to Blur an Image for Design or Privacy
Blur has two jobs: making a soft background and hiding private details. They need very different settings — here's how to get each one right.
Read the full guideBMP to PNG: Shrink Bitmaps Without Losing a Single Pixel
BMP stores every pixel uncompressed, so files balloon fast. PNG reproduces the exact same image losslessly at a fraction of the size — here's why and how.
Read the full guideHow to Convert an Image to Grayscale the Right Way
Not all grayscale is equal. A naive colour average produces flat, muddy results — proper luminance weighting keeps a photo's natural depth. Here's the difference.
Read the full guideGIF to JPG: How and When to Convert
JPG makes a GIF frame small and universal — but it drops transparency and animation. Here's when that trade is worth it and how to get the cleanest result.
Read the full guideHow to Crop an Image Into a Perfect Circle
Round profile pictures and logos look polished, but square editors make them fiddly. Here's the fastest way to get a perfect circle with a transparent background.
Read the full guideThe YouTube Thumbnail Size Guide for 2026
1280x720, 16:9, under 2MB — and why the right frame is only half the job. A practical guide to thumbnails that stay sharp and survive being shrunk.
Read the full guideSocial Media Image Sizes for 2026 (Every Major Platform)
A no-nonsense reference for post sizes across Instagram, Facebook, X and LinkedIn in 2026, plus why supplying the exact size keeps your images sharp.
Read the full guideConvert PNG to WebP: Smaller Files Without Losing Transparency
PNG keeps transparency but bloats your pages. WebP keeps the transparency and cuts most of the weight. Here's when to switch and how to do it safely.
Read the full guideWebP to PNG: When You Need a Lossless, Editable Copy
WebP is great for the web but awkward in editors and older apps. Here's when converting to PNG is the right call, and what it keeps.
Read the full guideHow to Compress a PDF to Email It Without Losing Readability
A scanned PDF that's too big to send is almost always full of high-resolution images. Here's how to shrink it to fit email and upload limits while keeping it readable.
Read the full guideHow to Split a PDF: Extract Pages or Separate a Bundle
When a PDF should be in pieces — a scanned batch, a long report, a single page you need to send — splitting is the fix. Here's how to do it without losing quality.
Read the full guideHow to Merge PDFs Into One File, Free and Privately
Application portals and reviewers usually want one PDF, not five attachments. Here's how to merge PDFs into a single, ordered file without uploading them.
Read the full guideGIF to PNG: When and Why to Convert
GIF is a 256-colour relic that still shows up everywhere. Here's exactly when turning a GIF into a PNG is the right move — and what to expect from the result.
Read the full guideWhich File Tool Do I Need? Let the File Decide
Most tool sites assume you already know the jargon. Here's a plain-English way to decide what to do with a PDF or image — and a faster shortcut.
Read the full guideHow to Edit a PDF for Free (Without Uploading It)
A typo in a contract, a date to fill in, a signature to add. Here's how to edit a PDF for free without installing software or handing your document to a server.
Read the full guideHow to Remove Image Backgrounds Privately With AI in 2026
Get clean, transparent cut-outs with AI that runs entirely on your device — no uploads, no accounts, full privacy.
Read the full guideHow to Watermark Images to Protect Them in 2026
A practical guide to watermarking — what text to use, the right opacity and placement, and the realistic limits of image protection.
Read the full guideHow to Pick Colors From an Image (HEX & RGB) in 2026
Sample exact HEX and RGB values from any image to match brand colors and build palettes — right in your browser.
Read the full guideHow to Flip and Mirror Images in 2026
Horizontal or vertical? Here's the difference, when each is useful, and how to fix backwards selfies in one click.
Read the full guideHow to Rotate and Straighten Photos in 2026
Why some photos show up sideways on certain devices — and how a quick, lossless rotation fixes them everywhere.
Read the full guideHow to Crop Images for Social Media and the Web in 2026
Cropping to the right aspect ratio stops platforms mangling your images and makes link previews look professional. Here's how to get it right.
Read the full guideImage SEO in 2026: How to Optimize Photos for Google
Images are often the biggest thing slowing your pages down and an untapped source of search traffic. Here's a practical image SEO checklist for 2026.
Read the full guideHow to Convert PDF Pages to Images in 2026
Turn PDF pages into sharp PNG images you can drop into slides, posts and pages — without uploading confidential documents.
Read the full guideHow to Reduce Image File Size on iPhone and Android
Phone photos are huge, and uploads and email reject them. Here is how to shrink them on iPhone and Android — including the HEIC problem — without installing anything.
Read the full guideHow to Convert Images to PDF in 2026
Turn photos and scans into clean, multi-page PDFs for applications, receipts and portfolios — privately, in your browser.
Read the full guideAVIF vs WebP vs JPG: Choosing the Best Image Format in 2026
AVIF is smallest, WebP is the safe modern default, JPG is universal. Here is exactly when to use each format on the web in 2026 — with the trade-offs that actually matter.
Read the full guideHEIC to JPG: The Complete iPhone Photo Guide for 2026
Everything you need to know about Apple's HEIC format — why it causes problems, how to convert to JPG, and how to avoid the hassle entirely.
Read the full guideWhy Convert JPG to WebP for Faster Websites in 2026
Switching site images from JPG to WebP is one of the highest-impact image-SEO wins of 2026. Here's why, and how to do it safely.
Read the full guideHow to Compress a Photo to 20KB for Online Exam Forms
Exam portals with a 20KB cap reject almost everything. Here is how to get a photo and signature under 20KB while keeping them clear enough to pass validation.
Read the full guideWebP to JPG: How to Fix Compatibility Issues in 2026
WebP is great for the web but still trips up editors, printers and older apps. Here's when and how to convert WebP to JPG.
Read the full guideWhat Size Should a Passport Photo Be? A Country-by-Country Guide
Passport photo dimensions differ by country and confuse almost everyone. Here are the exact sizes in mm, inches and pixels, and how to prepare a compliant photo yourself.
Read the full guideConvert PNG to JPG: When, Why and How in 2026
PNG photos are often needlessly huge. Here's when converting to JPG is the right move, what happens to transparency, and how to keep quality high.
Read the full guideJPG vs PNG: When to Convert and Why
JPG and PNG solve different problems. Here's exactly when converting JPG to PNG helps — and when WebP is the smarter modern choice.
Read the full guideHow to Resize Images for the Web and Social Media in 2026
Exact pixel sizes for websites and every major social platform, plus how correct dimensions protect Core Web Vitals and keep your images sharp.
Read the full guideHow to Compress Images Without Losing Quality: The Complete 2026 Guide
A practical, no-nonsense guide to shrinking image file sizes in 2026 — which formats to pick, what quality settings actually matter, and how smaller images improve SEO.
Read the full guide