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June 23, 2026 · 6 min read
Instagram processes every image you upload — it resizes it, re-encodes it as JPEG, and serves its own compressed version to viewers. If your source image is the wrong size or too heavily pre-compressed, the platform's re-encoding stacks on top of your compression and the result looks noticeably worse. Starting with the right dimensions and a clean, lightly compressed source file gives Instagram the best possible material to work with.
Instagram's feed supports three aspect ratios: square (1:1), portrait (4:5) and landscape (1.91:1). Portrait 4:5 takes up the most vertical space in the feed, which typically drives higher engagement — it's the most commonly recommended ratio for feed posts. Landscape posts feel more cinematic but take up less feed real estate.
For the actual pixel dimensions: square → 1080 × 1080 px; portrait → 1080 × 1350 px; landscape → 1080 × 566 px. Instagram scales everything to 1080 px wide on display, so there's no benefit to uploading wider than that.
Stories are 9:16 vertical, displayed at 1080 × 1920 px. Make sure your key content sits within the safe zone — roughly 250 px from the top and bottom — to avoid being cut off by the interface. For Reels cover images, use the same 9:16 ratio at 1080 × 1920 px.
Profile photos are displayed at 110 × 110 px in the app but stored larger. Upload at least 320 × 320 px to keep it sharp.
Instagram accepts JPEG and PNG uploads. For photographs, upload JPEG. Instagram's own re-encoding is JPEG-based, so uploading PNG for a photo just adds a re-encoding step with no quality benefit. For graphics with flat colour or text, PNG can preserve sharpness better — but Instagram will still re-encode to JPEG on delivery.
Keep your upload file under 8 MB (Instagram's hard cap) but ideally aim for 1–3 MB for a 1080 px wide JPEG at 85–90% quality. Don't pre-compress aggressively — give Instagram a clean, high-quality source. Instagram's own compression will reduce the effective quality; starting from an already-compressed file makes it worse.
Crop to your target ratio (4:5 recommended), resize to 1080 px wide, then export as JPEG at 85–90% quality. Check that the file is between 500 KB and 2 MB — that's the sweet spot. Too small and you've over-compressed; too large and you're burning upload time for no benefit.
If you're preparing content in bulk — say a month of posts — run batch compression at consistent settings so all your posts have the same sharpness and colour rendering. Our compressor handles batch jobs and lets you set the exact dimensions and quality for all files at once.