What is the best image size for an Instagram post?

For maximum feed visibility, use Portrait (1080×1350px, 4:5 ratio). For a clean grid, use Square (1080×1080px). For Stories and Reels, use 1080×1920px (9:16).

Does Instagram compress images when you upload?

Yes. Instagram recompresses all images to JPEG. Upload at exactly 1080px wide to skip the resampling step and preserve maximum quality.

Can I upload a HEIC photo from my iPhone to Instagram?

Instagram does not accept HEIC files directly. Use this tool to convert HEIC to JPEG and resize to the correct Instagram dimensions in one step.

What happens if I upload the wrong size to Instagram?

Instagram automatically crops images outside its accepted ratio range (4:5 to 1.91:1). Always resize to the correct dimensions before uploading to prevent unwanted cropping.

Is this Instagram image resizer free?

Yes, completely free. No sign-up, no watermark, no usage limits. All processing happens in your browser.

Resize Image for Instagram

Select your format, upload your photo — resized instantly to exact Instagram dimensions

Select format:

Drop image here or click to upload

JPG, PNG, WebP, HEIC — max 20MB

You can also paste an image (Ctrl+V)

⚡ Resized instantly·🔒 Files never leave your device·✓ Free, no sign-up

Official Instagram Image Size Requirements

Instagram accepts multiple aspect ratios, but it recompresses and crops any image that falls outside its accepted range. Uploading the correct pixel dimensions prevents automatic cropping and preserves maximum quality. Here are the exact specs for every Instagram format:

Format	Dimensions	Ratio	Best for
Square Post	1080×1080px	1:1	Grid uniformity, product shots
Portrait Post	1080×1350px	4:5	Max feed real estate, portraits
Landscape Post	1080×566px	1.91:1	Cinematic, panoramic shots
Story	1080×1920px	9:16	Full-screen vertical content
Reel	1080×1920px	9:16	Short-form video cover frame
Carousel (each slide)	1080×1080px	1:1	Multi-image posts, tutorials
Profile Picture	320×320px	1:1	Display at 110×110px on mobile

Instagram minimum width is 320px. Maximum display width is 1080px — uploading larger images does not improve quality and wastes storage.

How to Resize Images for Instagram — 3 Steps

1
Select your format
Choose the Instagram format at the top — Square (1080×1080), Portrait (1080×1350), Story (1080×1920), or Landscape (1080×566). Portrait takes up the most space in the feed and is the best default for most photos.
2
Upload your image
Click the upload area or drag and drop your JPG, PNG, WebP, or HEIC file. HEIC photos from iPhone are automatically converted to JPEG. Processing starts immediately — no button to click.
3
Download and post
The resized image downloads as a JPEG at your chosen dimensions. Upload directly to Instagram — no further resizing will occur because the image already matches the platform specification.

Instagram Post Formats — Which One to Use

Square (1080×1080) — 1:1

The original Instagram format. Safe for all images — the grid looks clean and consistent. Best for product photography, flat lays, and profile-building grids.

Portrait (1080×1350) — 4:5

Takes up 35% more vertical space in the feed than a square post. Higher visibility, more scroll-stop power. Best for portraits, food, and lifestyle photos.

Landscape (1080×566) — 1.91:1

Shows less of the feed than square or portrait. Best for architectural, nature, and cinematic shots where the wide frame is the point.

Story/Reel (1080×1920) — 9:16

Full screen on all phones. Leave a safe zone of roughly 250px top and bottom for the UI overlay. Best for immersive, full-attention content.

Does Instagram Compress Your Images?

Yes. Instagram applies JPEG compression to all uploaded photos, regardless of the original format or quality. The compression algorithm is designed to reduce bandwidth and storage costs — not to preserve image quality.

To minimize compression artifacts, follow these two rules:

→Upload exactly 1080px wide. Instagram resamples images that are larger or smaller than 1080px — adding a second round of quality loss. Uploading exactly 1080px wide bypasses this resampling step.
→Upload as JPEG at high quality. PNG and WebP files are converted to JPEG by Instagram anyway. Starting with a high-quality JPEG gives the platform less to degrade.

This tool outputs JPEG at high quality (quality 92) at exactly the Instagram-spec dimensions, which gives Instagram the best possible starting material.

iPhone HEIC Photos — Upload Directly

iPhones shoot in HEIC format by default since iOS 11. HEIC is not accepted by Instagram's web uploader and causes errors in many third-party tools. This tool accepts HEIC files directly and converts them to JPEG before resizing — no extra step needed.

The output is a standard JPEG at the exact Instagram dimensions you selected. You can upload it to Instagram immediately, or use it in any other app that expects JPEG input.

Tips for the Best Instagram Image Quality

→Start with the largest file you have. Resizing down from a 12MP phone photo to 1080px wide preserves far more detail than starting with a compressed 400px thumbnail.
→Use Portrait (4:5) for most photos. The extra vertical height means your post takes up more of the screen when followers scroll — proven to increase engagement.
→For carousels, use the same ratio for all slides. Instagram crops carousel slides to match the first slide's ratio. If your first slide is square, all slides will display as square.
→Avoid upscaling. Enlarging a small image to 1080px wide creates visible blurring. Always start with a photo larger than your target Instagram size.

Privacy — Your Photos Never Leave Your Device

All resizing happens 100% in your browser using the HTML5 Canvas API. Your images are never uploaded to a server, never stored, and never analyzed. This is especially important for personal photos — there is no cloud account, no retention policy, and no third-party access of any kind.

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Frequently Asked Questions

: For maximum visibility in the feed, use Portrait (1080×1350px, 4:5 ratio) — it takes up 35% more vertical space than a square. For a clean grid, use Square (1080×1080px). For Stories and Reels, use 1080×1920px (9:16).
: Yes. Instagram recompresses all images to JPEG. To minimize quality loss, upload exactly 1080px wide — this skips the resampling step. Uploading a larger image causes Instagram to downsample it, adding a second round of compression.
: Instagram's web uploader does not accept HEIC files directly. Use this tool to convert and resize HEIC to JPEG at the correct Instagram dimensions — then upload the JPEG file without any issues.
: Instagram automatically crops or pads images that fall outside its accepted ratio range (between 4:5 and 1.91:1). For example, a very tall portrait (taller than 4:5) gets cropped at the top and bottom. Always resize to the correct dimensions before uploading.
: JPEG. Instagram converts PNG files to JPEG anyway, adding its own compression on top of the PNG. Starting with a high-quality JPEG gives Instagram the best source material to work with.
: Instagram Stories are 1080×1920px (9:16). The top and bottom ~250px are covered by the profile name, date, and link button UI. Keep important content (faces, text, product) in the middle 1080×1420px zone to avoid being obscured.
: Use the Batch Resize tool — upload up to 10 images and resize them all to the same Instagram dimensions in one step. All resized images download as a single ZIP file.
: Yes, completely free. No sign-up, no watermark, no usage limits. All processing happens in your browser — your photos never leave your device.