Mastodon Image Resizer
Prepare a Mastodon avatar and profile header using the dimensions documented by the Mastodon project.
All Mastodon Image Sizes
Choose the Mastodon format you need, then review its source notes, crop, and image quality.
Sourced publishing presets
App Store and Developer Image Sizes
Prepare icons, screenshots, listing art, repository previews, and profile images with dimensions linked to current platform documentation.
Turn Resized Mastodon Images Into a PDF
Put one image on each page, arrange the order, and create the PDF in your browser.
About Mastodon Image Sizes
Prepare a Mastodon avatar and profile header using the dimensions documented by the Mastodon project. Use the sourced presets below, then review the crop and file requirements before submitting the result.
Each preset opens a working browser resizer. The destination service may apply its own compression, masks, or responsive crop after upload.
Mastodon Size Cheatsheet
Quick reference for all Mastodon image dimensions.
| Format | Dimensions |
|---|---|
| Mastodon Avatar | 400 × 400 |
| Mastodon Header | 1500 × 500 |
Posting somewhere else? Use the free image resizer to resize images for any platform.
How to resize images for Mastodon?
- 1
Step 1: Upload your image
Select the image you want to resize for Mastodon. Our tool supports JPG, PNG, WebP, and HEIC formats.
- 2
Step 2: Choose your Mastodon format
Select the specific Mastodon preset you need, whether it is a background, icon, thumbnail, profile image, banner, post, or another supported placement.
- 3
Step 3: Download and share
Review the crop and image quality, then download the resized image and upload it to Mastodon.
This page provides Mastodon Avatar (400x400), Mastodon Header (1500x500). Open a preset to see whether its dimensions are a documented requirement, recommendation, minimum, or practical working canvas.
File tools
Convert the resized image
Need a different file format or transparent background? Choose a focused converter, then check the preview and encoded size before downloading.
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