Image guides
Practical, no-fluff guides on image sizes, formats and file-size limits. Each one ends at a CrispPic tool that opens with the right settings already applied — and runs entirely in your browser, so nothing you try is ever uploaded.
Basics and how-tos
What makes files big, which format to pick, and how to get past an upload limit.
- 5 min read
How to Reduce Image Size Without Losing Quality
Why photos are so big, and the four steps that shrink them by 70–90% with no visible difference: resize, pick the right format, set a sensible quality, trim the rest.
- 3 min read
JPG vs PNG vs WebP: Which Image Format Should You Use?
A plain-English comparison of JPG, PNG and WebP — file size, quality, transparency and compatibility — and a simple rule for choosing the right one.
- 3 min read
How to Open and Convert HEIC Photos (iPhone, Windows, Mac)
Why iPhone photos won’t open or upload, and every way to convert HEIC to JPG — on the iPhone itself, on a Mac, on Windows, or free in your browser.
- 4 min read
Photo Too Large to Upload? How to Fit Any File Size Limit
Get a photo under the exact KB or MB limit an upload form demands: which limits are common, how to hit them, and what to do when compression alone isn’t enough.
- 4 min read
Pixels, DPI and Resolution: What Actually Matters
Pixels vs DPI vs PPI in plain English: why DPI is irrelevant on screens, how to work out the pixels a print needs, and what megapixels really tell you.
- 3 min read
How to Prepare a Passport or Visa Photo for Online Upload
Digital passport and visa photos have strict pixel and file-size rules. What the US DS-160 and UK passport portals ask for, and how to meet them step by step.
- 3 min read
How to Make Website Images Load Faster (Without Blur)
Images are usually the heaviest part of a web page. The sizes, formats and HTML settings that speed them up and improve Core Web Vitals without visible quality loss.
Social media image sizes
The pixel sizes each platform recommends, what gets cropped, and how to export a sharp result.
- 4 min read
Instagram Photo Size Guide (2026): Posts, Stories & Profile
The right pixel sizes for Instagram feed posts, Stories, Reels covers and profile photos in 2026 — and how to export a photo that stays sharp.
- 3 min read
Facebook Image Size Guide (2026): Posts, Links & Profile
Recommended Facebook image sizes for feed posts, link previews, Stories and profile photos in 2026, and how to stop your pictures being cropped or blurry.
- 3 min read
LinkedIn Image Sizes (2026): Profile Photo, Banner & Posts
LinkedIn profile photo, banner and post image sizes for 2026, the safe areas to design around, and how to export files that stay under the 8 MB limit.
- 3 min read
YouTube Thumbnail & Banner Size Guide (2026)
YouTube thumbnail size (1280 × 720), channel banner size (2560 × 1440), safe areas and file-size limits — and how to get a big image under the limit.
- 3 min read
X (Twitter) Image Sizes (2026): Profile, Header & Posts
Image sizes for X (Twitter) in 2026: profile photo, header and in-feed pictures — plus the file-size limits and how to avoid ugly timeline crops.