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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.

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

How image compression works: lossless vs lossy, what the quality slider really does, where resizing fits in, real numbers, and why WebP and AVIF do it better.

10 min read

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

WebP supports both lossy and lossless compression, transparency, and animation, making it ideal for most web images in 2026 with broad browser support

9 min read

How to Resize Images Without Losing Quality

What resizing really does to an image, why shrinking is safe but enlarging is limited, the DPI myth, and how to resize for web, print and social without blur.

9 min read

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

In-browser image processing keeps your photos private by design. Learn how client-side tools work and how you can verify no upload occurs during compression.

8 min read

How to Optimize Images for Website Speed & Core Web Vitals

Optimize images to improve page speed and Core Web Vitals. Resize to display size, compress with WebP, set dimensions, and avoid lazy-loading the hero image.

10 min read

How to Compress an Image to an Exact File Size (100 KB, 500 KB, 2 MB)

File size depends on pixel dimensions, format, quality, and metadata. This guide explains how to combine all four to reliably hit targets like 100 KB or 500 KB.

13 min read

Passport and Visa Photo Requirements: A Practical Guide to Getting It Accepted

Understand passport photo requirements including size, head height, background, and digital specs. See why photos get rejected and how to fix common issues.

12 min read

Preparing Images for Print: DPI, Resolution, and Why Screen Rules Do Not Apply

A photo that looks sharp on screen may print blurry if it lacks sufficient pixels. Learn how DPI and print size determine the resolution you actually need.

12 min read

What Platforms Do to Your Images (and How to Upload So They Survive)

Social media platforms re-encode images, reducing quality. This guide explains compression on Instagram, LinkedIn, WhatsApp, and how to upload effectively

12 min read

Reference tables

The numbers you came for, each in one place rather than spread across a page per value — upload limits, pixel dimensions, platform sizes and official photo specs.

Compress an image to a specific file size

Compress images to exact file sizes like 20KB or 1MB for forms, exams, or portals. See what quality to expect and how to reach the target without guesswork.

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Compress a PDF to a specific file size

Get a PDF under 100KB, 500KB, 2MB or any other upload cap. What actually drives PDF size, which targets are realistic, and when compression will not be enough.

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Standard image dimensions and print sizes

Every common pixel dimension and print size in one table — Full HD, 4K, A4, US Letter, photo prints — plus how DPI decides the pixel count you actually need.

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Social media image sizes

Image dimensions for Instagram, YouTube, Facebook, LinkedIn, TikTok, X, Pinterest, Threads, Discord, and Twitch with key crop zones and safe areas explained.

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Passport and visa photo sizes by country

Official passport photo dimensions for the US, UK, EU, India, Canada, Australia, China, Japan, Schengen and more — plus the rules that get photos rejected.

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Marketplace product image requirements

Image size, background and framing rules for Amazon, Shopify, Etsy, eBay, WooCommerce, Vinted, Depop and Poshmark — in one comparison table.

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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.

Put it into practice

Free, private, browser-based image tools — no uploads, no account.

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