Automated Postly Tool
Resize Images Online for Every Platform
Choose Fix images to adjust supported dimensions and aspect ratios before publishing—review the output, no re-exports. Create once, schedule everywhere.
Desktop preview
Safe areas & banners
Mobile preview
Stories, Reels & Shorts
Auto-apply on publish
No manual exports
Exact width presets per platform
Aspect ratios: 1:1, 4:5, 9:16, 16:9, 2:1
Destination-specific validation
Resize with preview review
Clear replacement guidance
Padding for supported aspect-ratio fixes
How Auto-Fix Works During Publishing
- Upload or select your creative in Postly.
- Choose platforms; Auto-Fix selects the right size and aspect ratio for each destination.
- Review the repaired images in the channel preview.
- Resolve any remaining validation issues, then schedule or publish.
Why resize images online with Postly?
- Resize images online with automated social media presets.
- Instagram, LinkedIn, TikTok, YouTube, Facebook, and Pinterest sizes supported.
- Keep branding consistent across campaigns and channels.
- Batch-prepare assets while scheduling posts in Postly.
- Reduce manual edits, rejections, and republishing cycles.
Supported presets
Instagram square/portrait/story/reel cover, X (Twitter) post/header, LinkedIn post/banner, TikTok story/cover, YouTube thumbnail, Facebook post/cover, Pinterest pin & more.
Frequently Asked Questions
How is this different from a regular image resizer?
Choose Fix images in the channel preview. Postly resizes or pads supported images to the selected destination requirements, then validates the result.
Can I lock a specific aspect ratio?
Auto-Fix follows the selected destination requirements. For a custom crop or composition, edit the original and upload it again.
Does resizing reduce my quality?
Resizing and JPEG compression can change quality. Auto-Fix cannot restore missing detail; replace an undersized image with a larger original.
Is there a preview?
Yes. Review the result in the channel preview before publishing.