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Tips, guides, and comparisons for image conversion — 48 articles and counting.
Most image problems are one of three things: a format something will not open (HEIC on Windows, WebP in an older editor, AVIF almost anywhere), a file that is too big for an email or an upload form, or a print that comes out soft because the pixel count was never there. The guides below take those one at a time, in plain English, with the exact settings to use on iPhone, Android, Windows and Mac.
Start with the fixes if something is not working right now: file type not supported, why a photo will not upload and saving a screenshot as a JPG. For print work, read DPI and resolution explained. Every converter and tool on this site runs inside your browser, so the files you work on in these guides never leave your device.
How to Convert HEIC to JPG on Windows
Someone sent you photos from an iPhone, Windows shows a row of blank thumbnails, and double-clicking offers to sell you something from the Microsoft Store. Here is why, and four ways round it.
How to Convert HEIC to JPG on a Mac
A Mac displays HEIC perfectly well, which is exactly why the problem catches people out — everything looks fine until you email the file to someone on Windows, or upload it to a site that rejects it.
How to Convert HEIC to JPG on Android
Someone AirDropped or emailed you photos from an iPhone and your Android phone shows a file it will not open, or opens it in one app and refuses in another. Support is genuinely inconsistent, and it depends on who made your phone.
How to Batch Convert HEIC to JPG
Converting one photo is easy. Converting eight hundred of them, off a phone, without paying for anything or uploading your family photos to a stranger's server, is the part that needs a plan.
RAW to JPG: How to Convert Camera Files
You copied photos off a camera and got a folder of .CR2, .NEF or .ARW files that nothing will open. They are not broken and they are not really image files — which is exactly why the usual tricks fail.
How to Extract Text From an Image
You have a photo of a page, a screenshot of a table, or a receipt, and you want the words as text you can edit. The good news is you almost certainly do not need to install or pay for anything.
JPG, JPEG, JFIF and JPE Explained
A site rejects your photo for being the wrong type. You check, and it is a JPEG. It is also a .jfif, and that one letter is the whole problem.
How to Batch Convert WEBP to JPG
Saving images from the web for a few months leaves you with a folder full of .webp files that half your software refuses to open. Converting them one at a time is not a plan.
How to Make a Photo Black and White
Removing the colour from a photograph is easy. Removing it well — so the picture gains something rather than just losing its colour — is a different job, and it comes down to which colours you let become which greys.
How to Turn a Photo Into Pixel Art
A mosaic filter makes a photograph look blocky. Pixel art is something else — a picture that genuinely has very few pixels, each one carrying real weight. Getting there means throwing resolution away on purpose.
How to Scan Film Negatives and Get the Colours Back
You have a shoebox of negatives, a flatbed scanner and a folder of orange ghosts. Inverting them gives you something recognisable and strongly blue. Here is why, and how to fix it without buying anything.
Image Accessibility: Colour Blindness and Alt Text
Roughly 8% of men and 0.5% of women of northern European descent cannot reliably tell your red from your green. They will not email you about your chart. They will simply stop using it.
Why Photoshop Says a File Type Is Not Supported (and the Fix)
Photoshop opens almost everything, which makes it more confusing when it refuses a perfectly ordinary-looking photo. The error is nearly always one of five things, and you can tell which in about ten seconds.
Why Won't My Photo Upload? Nine Causes and Fixes
Format, size, dimensions or colour profile — work down these nine causes and get your photo accepted anywhere.
Unsupported File Type on Google Drive: The Fix
Your file uploaded fine — Drive just cannot preview it. What the message means and the two-minute fix.
How to Convert a Screenshot to PDF
One screenshot or forty into a single PDF on iPhone, Android, Windows or Mac — and how to keep it emailable.
How to Save an iPhone Photo as a JPG
There is no Save as JPG button on an iPhone. Six methods that work, ranked by speed.
What DPI Should an Image Be for Screen?
72 DPI for web is forty-year-old advice. Here is what actually controls sharpness on a screen.
How to Make Images Smaller for Email
Fix Gmail's 25MB limit and compress photos for any email provider. Step-by-step guide with size comparison tables.
How to Convert iPhone Photos to JPG
iPhone saves photos as HEIC — here's how to convert them to universally compatible JPG format in seconds.
Social Media Image Sizes Guide 2026
Exact image dimensions for Instagram, Facebook, X, LinkedIn, TikTok, YouTube, and Pinterest. Complete cheat sheet.
Fix 'File Type Not Supported' Upload Errors
Getting upload errors on websites? Learn how to convert any image to an accepted format in 30 seconds.
Compress Images for Your Website Without Losing Quality
Optimize images for faster loading, better SEO, and improved Core Web Vitals. Complete guide for developers and business owners.
Convert Images for Etsy, eBay & Amazon Listings
Get your product photos in the right format and size for every major marketplace. Complete e-commerce image requirements guide.
How to Prepare Images for Printing (DPI, Format & Color)
Understand DPI, color modes, and file formats for professional printing. Posters, photos, business cards, and more.
Passport & ID Photo Format Guide (2026)
Exact photo dimensions, file size limits, and format requirements for passport, visa, and government ID applications worldwide.
WEBP Images Not Opening? Here's How to Fix It
Can't open WEBP files? Learn why this happens and 5 easy ways to view or convert WEBP images on any device.
Bulk Rename & Convert Images for Photographers
Streamline your photography workflow: batch rename, convert, and compress hundreds of images in minutes.
Image Formats Explained: JPG vs PNG vs WEBP vs AVIF vs SVG
The definitive guide to every image format. When to use each, pros and cons, and conversion tips.
How to Convert Screenshots to JPG on Any Device
Screenshots save as PNG and can be huge. Learn how to convert them to lightweight JPGs on Windows, Mac, iPhone, and Android.
PNG vs JPG: When to Use Each Format
Complete guide to PNG vs JPG differences. Learn about transparency, compression, file size, and when to use each image format.
WEBP vs JPG: Which Image Format Should You Use?
A comprehensive comparison of WEBP and JPG formats. Learn when to use each and how to convert between them.
How to Reduce Image File Size Without Losing Quality
7 proven techniques to dramatically reduce image file sizes while keeping your images looking great.
How to Convert iPhone HEIC Photos to JPG
Step-by-step guide to converting HEIC photos from your iPhone to universally compatible JPG format.
Best Image Formats for Web in 2026
Compare AVIF, WebP, JPG, PNG, and SVG — the definitive guide to choosing the right format for performance and SEO.
How to Convert Images in Bulk for Free
Learn how to batch convert hundreds of images at once with our free browser-based tool. No uploads required.
The Ultimate Image Compression Guide for Web
Everything you need to know about optimizing images for faster websites without sacrificing quality.
Understanding Image Resolution and DPI
What resolution, DPI, and PPI actually mean — and how they affect print quality, web display, and file size.
WEBP vs AVIF: Which Format Should You Use in 2026?
Compression, encoding speed, browser support and colour depth compared — plus how to serve both formats safely.
Image SEO: Rank Your Photos in Google Images
Filenames, alt text, formats, dimensions, lazy loading and structured data — the full image SEO checklist with target file sizes.
EXIF Data and Photo Privacy: What Your Images Reveal
Your photos carry GPS coordinates and device IDs. Here's what's hidden inside and how to strip it before you share.
Transparent Background Images: Formats That Keep Alpha
Which formats support transparency, why JPG destroys it, and how to fix white boxes, dark halos and jagged edges.
sRGB vs Adobe RGB vs Display P3 Explained
Why photos look washed out after uploading, and the simple convert-to-sRGB rule that fixes almost every colour shift.
Favicon Sizes Guide 2026: Every Size You Need
The current favicon list — 32, 180, 192 and 512 — plus design rules, maskable icons and why your new favicon isn't showing.
DPI vs PPI: The Difference, Explained Without the Jargon
Pixels per inch, dots per inch, and why your browser ignores both. The cheat sheet for web, print and screens.
300 DPI vs 150 DPI: What Each Means for Your Print
150 DPI isn't half the quality — it's a quarter of the pixels. Size tables and when 150 is genuinely enough.
HEIC to JPG on iPhone: Every Setting That Controls It
Four iPhone settings decide whether your photos arrive as HEIC or JPG. Change the right one and it never comes back.
What Is a WEBP File — and Why Did You Just Download One?
Where .webp files come from, why your computer won't open them, and when to keep or convert them.