Image Compression Guides

Practical, step-by-step tutorials for shrinking photos, converting formats and speeding up your website. Every guide links to our free bulk image compressor so you can apply what you learn straight away.

Compress an Image to 100KB, 50KB or 20KB

Hit strict upload limits on exam, job and visa forms without blur.

Convert HEIC to JPG

Make iPhone photos open everywhere, in bulk and privately.

Reduce Image Size for a Faster Website

Improve page speed, Core Web Vitals and rankings.

How to Compress Images for WhatsApp Without Losing Quality

Learn how to compress photos for WhatsApp to save data and storage, when to send as a document, and how to keep pictures sharp.

Passport, ID and Signature Photo Size in KB: How to Meet the Limit

How to reduce passport, visa, ID and signature photos to the KB limit required by online forms, with quality tips and common mistakes.

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

Compare JPG, PNG and WebP by file size, quality, transparency and browser support, and learn which image format to use for each job.

How to Compress Images for Email and Fix "Attachment Too Large"

Fix the 'attachment too large' email error by compressing photos before sending. Learn typical size limits and the best settings.

How to Compress a Signature Image to 20KB for Online Forms

Reduce a scanned or photographed signature to 20KB or 50KB for online forms without losing the thin pen lines. Step-by-step tips.

How to Convert PNG to JPG Online (and When You Should)

Convert PNG images to JPG in bulk, free and private. Learn when PNG to JPG makes sense, what happens to transparency and how much size you save.

How to Compress Images for Instagram and Facebook Without Blur

How to prepare photos for Instagram and Facebook so they upload fast and stay sharp after the platform recompresses them.

How to Compress Product Photos for Your Online Store

Speed up your online shop by compressing product photos for Shopify, WooCommerce, Etsy and marketplaces without losing sharpness.

How to Compress Images for Pinterest Pins (Size, Ratio and File Size)

Best image size, ratio and file size for Pinterest pins, plus how to compress pin images so they load fast and stay sharp.

How to Bulk Compress Photos on iPhone Without Any App

How to compress many iPhone photos at once, convert HEIC to JPG and free up storage, using only Safari. No app needed.

How to Compress Images for WordPress to Speed Up Your Site

Learn how to compress and resize images before uploading to WordPress to improve speed, Core Web Vitals and SEO, with recommended sizes.

Resize vs Compress an Image: What Is the Difference?

Understand the difference between resizing and compressing images, when to use each and how combining them gives the smallest file with the best quality.

Have a topic request or found something unclear? Tell us.