ResizeFox tutorials
The right size.
The right format.
Learn how to prepare images for social posts, application forms and the web. Follow worked examples, understand the tradeoffs and open the tool you need.
Try the Image Compression Lab
Compare JPG, PNG and WebP using original test patterns. Inspect small text, gradients and transparency, then download the measured results.
Run an experiment →Documents
Step-by-step guide
How to resize a screenshot without making the text unreadable
Prepare readable screenshots for support tickets and tutorials by cropping first, preserving text detail and checking the exported copy.
Read tutorial →Step-by-step guide
Passport photo dimensions: millimetres, pixels and country rules
Understand French 35 × 45 mm and US 2 × 2 inch photo formats, pixel calculations, and why resizing cannot certify an identity photo.
Read tutorial →File formats
Step-by-step guide
Resize a transparent PNG logo without adding a white background
Keep transparency, check logo edges on light and dark backgrounds and distinguish a transparent file from a white-background image.
Read tutorial →Step-by-step guide
JPG, PNG or WebP: which image extension should you choose?
Choose a format for photos, transparent logos and web images, and learn why renaming a file does not convert it.
Read tutorial →Product photos
File size
Step-by-step guide
How to prepare several photos for one email
Budget attachment sizes across a set of photos, preserve useful detail and choose between attached files and a shared original.
Read tutorial →Step-by-step guide
How to meet a 20 KB, 100 KB or 1 MB image upload limit
A step-by-step workflow for meeting file-size limits while checking dimensions, output format and legibility.
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Social media
Step-by-step guide
How to resize a photo for an Instagram post
Prepare square and portrait Instagram images, choose JPG or PNG, and avoid stretching photos when changing aspect ratio.
Read tutorial →Step-by-step guide
Facebook Reels: prepare vertical images and cover artwork
Use a 9:16 canvas for vertical Reel artwork, understand 1080 × 1920, and keep important content away from interface overlays.
Read tutorial →Step-by-step guide
TikTok resolution: prepare a 9:16 image for your video
Understand 1080 × 1920 versus 720 × 1280, prepare vertical still assets and avoid confusing image compression with video export.
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