All Guides
Practical guides on compressing images to exact file sizes, meeting upload requirements, choosing the right format, and keeping websites fast. Every guide uses the free browser compressor — no uploads, no sign-up.
Compress to an exact file size
- How to compress an image to 50KB — strict budgets and what quality to expect
- How to compress a JPG to 100KB — the most common form and portal limit
- How to compress a PNG to 200KB — why PNG shrinks differently, and when to convert
- How to compress a signature image to 20KB — capture tips for exam and banking forms
Forms, portals and official requirements
- Passport photo file size requirements — pixels, ratios and KB limits for ID uploads
- Compressing images for email attachments — Gmail and Outlook limits, explained properly
Formats and quality
- JPG vs PNG vs WebP vs AVIF — the 2026 decision guide
- Reduce image size without losing quality — lossless vs visually lossless, and the levers that work
- Why is my PNG file so big? — four causes, four fixes
- Converting HEIC to JPG — iPhone photos for the rest of the internet
Web, stores and social
- The complete guide to compressing images for the web — Core Web Vitals, formats, delivery
- Compressing and optimizing images in WordPress — without plugin bloat
- Optimizing product images for ecommerce — Shopify, Amazon, eBay, Etsy targets
- Social media image sizes 2026 — dimensions and file size targets per platform
Ready to compress something?
Every guide above uses the same tool: the JpegDiet compressor. Set a target size, drop in your files, download the results — all in your browser.