Every platform re-compresses what you give it. Hand it the exact pixels it renders and it scales nothing, which is the difference between crisp and soft. Instagram, Facebook, Pinterest, X, YouTube and your site: tick the sizes, and each photo comes back in all of them the moment it lands, on your own machine. Sizes checked August 2026.
Uploading at the exact render size means the platform scales your photo as little as possible, which is the difference between a crisp frame and a soft one, most of all on text and fine detail. The resize itself is done in steps with high-quality smoothing, which measured 10 dB closer to a Lanczos reference than a single canvas draw, and each photo is decoded once in a worker and written out in every size from that one decode. Re-encoding here also strips EXIF, including GPS, which is what you want for social. Picking which vertical frames deserve the feed at all is its own craft; we wrote about it in selecting vertical photos for social and the same day social workflow.
Every platform wants a different shape, and a photograph composed for one of them is being cut for the rest. Four things worth knowing before you export a set.
No. Resizing happens on a canvas inside your browser; files never leave your device.
Portrait posts render at 1080 x 1350, squares at 1080 x 1080, stories and reels at 1080 x 1920. Sizes checked August 2026.
Yes, canvas re-encoding drops EXIF including GPS. Keep originals for your archive; check what a file carries with the EXIF viewer.
For photographs JPEG at quality 85 is smaller and visually identical on social. PNG is for graphics with flat color and hard edges. JPEGs here are written by mozjpeg with full color resolution (4:4:4), which a browser's own export does not do, so colored edges stay clean and the files come out smaller.
Up to 100 photos, and up to 300 output files a run. Tick three sizes for 100 photos and you get 300 files, each named for its size.
Shrinking a 6000 pixel frame to 1080 softens every edge a little. Light applies a small unsharp mask after the resize, on luminance only, skipping flat tone so grain is not lifted, and only when the photo was really downsized. It is the same idea as an export sharpened for screen. Set it to Off and the pixels are left exactly as resampled.
Yes. Safari decodes HEIC itself; every other browser loads a decoder once, about a megabyte, and does it on your machine. JPEG, PNG and WebP work everywhere.
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