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    rsz.app logo - AI-powered image resizer tool

    resizeapp™

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    Instagram Post Resizer (1080×1350)

    Create perfect Instagram posts with AI. Resize any image to 1080×1350 for maximum feed visibility.

    Professional Instagram post resizer for influencers, brands, and content creators. Our AI optimizes images for Instagram's 4:5 portrait format while preserving faces and important details. Free credits available.

    Instagram Post Specifications

    Dimensions:
    1080 × 1350 px
    Aspect Ratio:
    4:5 (Portrait)
    File Size:Up to 25MB
    Formats:JPG, PNG, WebP

    3 free credits • No watermark • AI-powered

    How to Resize Images for Instagram Posts

    1

    Upload Your Photo

    Select any image from your device or drag and drop

    2

    AI Processing

    Our AI resizes to 1080×1350 while preserving key elements

    3

    Post to Instagram

    Download and upload directly to your Instagram feed

    Frequently Asked Questions

    What is the best Instagram post size?

    The optimal Instagram post size is 1080×1350 pixels (4:5 aspect ratio). This portrait format maximizes screen space in the Instagram feed and provides better engagement.

    Can I use square images for Instagram posts?

    Yes, Instagram supports 1080×1080 square images. However, 1080×1350 (4:5 vertical) takes up more feed space and typically gets better visibility.

    Does resizing reduce Instagram image quality?

    Our AI resizer maintains maximum quality during the resize process. Instagram may compress images on upload, but starting with the correct 1080×1350 size minimizes quality loss.

    Can I batch resize multiple Instagram posts?

    Yes! Upload multiple images at once and our AI will resize all of them to 1080×1350 simultaneously, perfect for planning your Instagram grid.

    What file formats work for Instagram posts?

    Instagram supports JPG, PNG, and WebP formats. Our resizer accepts all three and outputs high-quality images ready to post.

    Related Image Resizers

    Instagram Story (1080×1920)
    Pinterest Pin (1000×1500)
    All Social Media Sizes

    AI Image ResizingAny Size, Perfect Fit

    Make every ratio feel native — our AI intelligently preserves composition, pose, and perspective
    Social MediaAdsE-commerceWeb Design
    Join 1,000+ users • Batch processing • API
    Standard resized image without AI enhancement
    AI-resized image with perfect quality preservation
    RegularAI

    Stunning Quality

    Total Aspect Freedom

    Create any custom dimension instantly with up to 4x upscale or downscale

    Aspect ratio flexibility visualization

    Flawless AI Quality

    Preserve perfect clarity and detail with our industry-leading AI model

    AI quality enhancement visualization

    Intelligent Reframing

    Automatically keeps key subjects perfectly in frame

    Content-aware reframing visualization

    Blazing-Fast API

    Integrate and automate your entire creative workflow in minutes

    Fast API processing visualization

    All-in-one AI Image Resizer

    resizeapp™ allows you to resize any photo for any format—while keeping the subject perfectly framed.

    Our AI automatically adjusts the composition of photos by predicting precise adjustments to the image layout, ensuring subjects are optimally positioned and edges are naturally balanced, all without generating new content. No prompts or manual work required.

    One-click AI image resizing interface - simple and intuitive process
    API integration workflow diagram - developer tools for automated image resizing

    Seamlessly Fits Your Workflow

    Looking to automate intelligent image resizing? Our powerful API integrates effortlessly, helping you bring smart, AI resizing into your creative or production pipeline.

    They love us.
    You will too.

    Join thousands of creators, marketers, and developers who trust resizeapp™

    "
    Post-shoot, resizing 500 SKUs used to take a full day. With resizeapp™ we drop the folder in, select PDP, thumbnail, marketplace, and story presets, and it keeps shoes and faces perfectly in frame. We now publish the same day, catalog throughput is up 3×, and 'cropped-off product' tickets went to zero
    L
    Lina M., Head of E-commerce, mid-size fashion retailer
    Verified Customer
    "
    Creative refreshes were a scramble. resizeapp™ turns one 15-second cut into on-brand 1:1, 4:5, and 9:16, tracking the subject so nothing important gets cropped. Our weekly build time fell from 6 hours to under 40 minutes, CTR lifted 19%, and CPA dropped 14% on the last campaign
    M
    Marco P., Performance Marketing Lead, DTC skincare brand
    Verified Customer
    "
    Our DAM was drowning in variants. With resizeapp™'s we upload one master and export channel-ready packs for web, app, newsletter, and partner portals while preserving logos and safe areas. 92% of assets ship with no manual touch, and average turnaround fell from 36 hours to 5
    R
    Ruth A., Content Operations Manager, real-estate marketplace
    Verified Customer