Free Mastodon Image Resizer
Resize Mastodon images while keeping important details clear. Your server can set its own limits.
JPG, PNG or WebP · Up to 15 MB / 40 megapixels. Or try the sample.
If an export exceeds this preset’s file-size limit, choose JPG. Your dimensions stay exact.
Downloads are free. Saving to Content Library requires an eligible plan. Images stay in your browser until you choose to save.
Make it fit. Make it yours.
Bring your image and next post together in SocialBlaze.
Mastodon image sizes, ready to use
These are practical working sizes. Platforms may crop images differently across devices, placements and publishing methods. Review the final preview before posting.
Post image · square — 1280 × 1280 px
Use this export as a starting point, then check your platform’s final preview. Export one image at a time; carousel presets create individual cards.
Post image · landscape — 1600 × 900 px
Use this export as a starting point, then check your platform’s final preview. Export one image at a time; carousel presets create individual cards.
Post image · portrait — 1080 × 1350 px
Use this export as a starting point, then check your platform’s final preview. Export one image at a time; carousel presets create individual cards.
Header image — 1500 × 500 px
Use this export as a starting point, then check your platform’s final preview. Export one image at a time; carousel presets create individual cards.
Avatar (profile picture) — 400 × 400 px
Keep faces and logos centered for circular crops. Export one image at a time; carousel presets create individual cards.
Can I save on Free Forever?
You can download your image without an account. Content Library keeps its existing plan access; creating a Free Forever account does not unlock library storage.
