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Image Guides & Tutorials

Everything we know about making images smaller, faster, and safer — explained in plain English. Start with the cornerstone guides, then dive into focused how-tos by topic. Every technique here runs entirely in your browser: no uploads, no sign-up, no servers.

Start here: cornerstone guides

How Image Compression Actually Works: Lossy, Lossless, and Every Format

A plain-English tour of what really happens when you compress an image — how JPEG throws away detail your eyes ignore, how PNG shrinks files with zero loss, and how to pick the right trade-off.

10 min read

JPG vs PNG vs WebP vs AVIF: Which Image Format Should You Use?

A practical decision guide to the formats that matter — JPG, PNG, WebP, AVIF, GIF and SVG — what each is actually good at, and a simple rule for picking the right one every time.

9 min read

How to Resize Images Without Losing Quality

What actually happens when you resize an image, why shrinking is safe but enlarging is not, the DPI myth, and how to resize for the web, print, and social without softening your photos.

9 min read

Why In-Browser Image Tools Are More Private (and How Client-Side Processing Works)

Most "free online" image tools upload your photos to a server. Client-side tools do everything on your own device. Here is the difference, how it works technically, and how to verify it yourself.

8 min read

How to Optimize Images for Website Speed & Core Web Vitals

Images are usually the heaviest thing on a web page. Here is a practical, order-of-operations playbook to make them load fast, pass Core Web Vitals, and help your SEO — without wrecking quality.

10 min read

Browse by topic

Compress & Optimize

Shrink image (and video) files for the web, email, and upload limits — and understand exactly how compression works so you never sacrifice quality you did not need to.

Convert & Formats

JPG, PNG, WebP, AVIF, HEIC, SVG — what each format is for and how to convert between them without losing quality or breaking transparency.

Resize & Crop

Change dimensions and aspect ratios the right way — shrink freely, enlarge carefully, and hit exact sizes for print, marketplaces, and documents.

Edit & Enhance

Remove backgrounds and objects, upscale, add text, filters, watermarks, and more — all in your browser, no design software required.

Privacy & Metadata

Why processing images on your own device beats uploading them, plus how to strip hidden EXIF/location data and hide faces before you share.

Web, Social & Developers

Get images right for websites and every social platform, plus developer essentials — favicons, Open Graph images, QR codes, and OCR.